* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
* was re-ported from NetBSD and debianized.
*
- *
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
*/
/*
- * rewrite arith.y to micro stack based cryptic algorithm by
- * Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
- *
- * Modified by Paul Mundt <lethal@linux-sh.org> (c) 2004 to support
- * dynamic variables.
- *
- * Modified by Vladimir Oleynik <dzo@simtreas.ru> (c) 2001-2005 to be
- * used in busybox and size optimizations,
- * rewrote arith (see notes to this), added locale support,
- * rewrote dynamic variables.
- *
- */
-
-/*
- * The follow should be set to reflect the type of system you have:
+ * The following should be set to reflect the type of system you have:
* JOBS -> 1 if you have Berkeley job control, 0 otherwise.
* define SYSV if you are running under System V.
* define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
* a quit signal will generate a core dump.
*/
#define DEBUG 0
+/* Tweak debug output verbosity here */
+#define DEBUG_TIME 0
+#define DEBUG_PID 1
+#define DEBUG_SIG 1
+
#define PROFILE 0
#define IFS_BROKEN
#define JOBS ENABLE_ASH_JOB_CONTROL
#if DEBUG
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
+# ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+# endif
#endif
#include "busybox.h" /* for applet_names */
+//TODO: pull in some .h and find out do we have SINGLE_APPLET_MAIN?
+//#include "applet_tables.h" doesn't work
#include <paths.h>
#include <setjmp.h>
#include <fnmatch.h>
-#if JOBS || ENABLE_ASH_READ_NCHARS
-#include <termios.h>
+#include "math.h"
+
+#if defined SINGLE_APPLET_MAIN
+/* STANDALONE does not make sense, and won't compile */
+#undef CONFIG_FEATURE_SH_STANDALONE
+#undef ENABLE_FEATURE_SH_STANDALONE
+#undef IF_FEATURE_SH_STANDALONE
+#undef IF_NOT_FEATURE_SH_STANDALONE(...)
+#define ENABLE_FEATURE_SH_STANDALONE 0
+#define IF_FEATURE_SH_STANDALONE(...)
+#define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
+#endif
+
+#ifndef PIPE_BUF
+# define PIPE_BUF 4096 /* amount of buffering in a pipe */
#endif
#if defined(__uClinux__)
-#error "Do not even bother, ash will not run on uClinux"
+# error "Do not even bother, ash will not run on NOMMU machine"
#endif
#define CMDTABLESIZE 31 /* should be prime */
-/* ============ Misc helpers */
-
-#define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
-
-/* C99 say: "char" declaration may be signed or unsigned default */
-#define signed_char2int(sc) ((int)((signed char)sc))
-
-
/* ============ Shell options */
static const char *const optletters_optnames[] = {
enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
-static char optlist[NOPTS] ALIGN1;
-
-#define eflag optlist[0]
-#define fflag optlist[1]
-#define Iflag optlist[2]
-#define iflag optlist[3]
-#define mflag optlist[4]
-#define nflag optlist[5]
-#define sflag optlist[6]
-#define xflag optlist[7]
-#define vflag optlist[8]
-#define Cflag optlist[9]
-#define aflag optlist[10]
-#define bflag optlist[11]
-#define uflag optlist[12]
-#define viflag optlist[13]
-#if DEBUG
-#define nolog optlist[14]
-#define debug optlist[15]
-#endif
-
/* ============ Misc data */
/*
* We enclose jmp_buf in a structure so that we can declare pointers to
* jump locations. The global variable handler contains the location to
- * jump to when an exception occurs, and the global variable exception
+ * jump to when an exception occurs, and the global variable exception_type
* contains a code identifying the exception. To implement nested
* exception handlers, the user should save the value of handler on entry
* to an inner scope, set handler to point to a jmploc structure for the
// /* do we generate EXSIG events */
// int exsig; /* counter */
volatile int suppressint; /* counter */
+// TODO: rename
+// pendingsig -> pending_sig
+// intpending -> pending_int
volatile /*sig_atomic_t*/ smallint intpending; /* 1 = got SIGINT */
/* last pending signal */
volatile /*sig_atomic_t*/ smallint pendingsig;
- smallint exception; /* kind of exception (0..5) */
+ smallint exception_type; /* kind of exception (0..5) */
/* exceptions */
#define EXINT 0 /* SIGINT received */
#define EXERROR 1 /* a generic error */
#define EXEXIT 4 /* exit the shell */
#define EXSIG 5 /* trapped signal in wait(1) */
- /* trap handler commands */
- char *trap[NSIG];
smallint isloginsh;
- char nullstr[1]; /* zero length string */
+ char nullstr[1]; /* zero length string */
+
+ char optlist[NOPTS];
+#define eflag optlist[0]
+#define fflag optlist[1]
+#define Iflag optlist[2]
+#define iflag optlist[3]
+#define mflag optlist[4]
+#define nflag optlist[5]
+#define sflag optlist[6]
+#define xflag optlist[7]
+#define vflag optlist[8]
+#define Cflag optlist[9]
+#define aflag optlist[10]
+#define bflag optlist[11]
+#define uflag optlist[12]
+#define viflag optlist[13]
+#if DEBUG
+#define nolog optlist[14]
+#define debug optlist[15]
+#endif
+
+ /* trap handler commands */
/*
* Sigmode records the current value of the signal handlers for the various
* modes. A value of zero means that the current handler is not known.
- * S_HARD_IGN indicates that the signal was ignored on entry to the shell,
+ * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
*/
char sigmode[NSIG - 1];
-#define S_DFL 1 /* default signal handling (SIG_DFL) */
-#define S_CATCH 2 /* signal is caught */
-#define S_IGN 3 /* signal is ignored (SIG_IGN) */
+#define S_DFL 1 /* default signal handling (SIG_DFL) */
+#define S_CATCH 2 /* signal is caught */
+#define S_IGN 3 /* signal is ignored (SIG_IGN) */
#define S_HARD_IGN 4 /* signal is ignored permenantly */
-#define S_RESET 5 /* temporary - to reset a hard ignored sig */
/* indicates specified signal received */
- char gotsig[NSIG - 1];
+ uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
+ char *trap[NSIG];
+
+ /* Rarely referenced stuff */
+#if ENABLE_ASH_RANDOM_SUPPORT
+ /* Random number generators */
+ int32_t random_galois_LFSR; /* Galois LFSR (fast but weak). signed! */
+ uint32_t random_LCG; /* LCG (fast but weak) */
+#endif
+ pid_t backgndpid; /* pid of last background process */
+ smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
};
extern struct globals_misc *const ash_ptr_to_globals_misc;
#define G_misc (*ash_ptr_to_globals_misc)
-#define rootpid (G_misc.rootpid )
-#define shlvl (G_misc.shlvl )
-#define minusc (G_misc.minusc )
-#define curdir (G_misc.curdir )
-#define physdir (G_misc.physdir )
-#define arg0 (G_misc.arg0 )
+#define rootpid (G_misc.rootpid )
+#define shlvl (G_misc.shlvl )
+#define minusc (G_misc.minusc )
+#define curdir (G_misc.curdir )
+#define physdir (G_misc.physdir )
+#define arg0 (G_misc.arg0 )
#define exception_handler (G_misc.exception_handler)
-#define exception (G_misc.exception )
+#define exception_type (G_misc.exception_type )
#define suppressint (G_misc.suppressint )
#define intpending (G_misc.intpending )
//#define exsig (G_misc.exsig )
#define pendingsig (G_misc.pendingsig )
-#define trap (G_misc.trap )
-#define isloginsh (G_misc.isloginsh)
-#define nullstr (G_misc.nullstr )
-#define sigmode (G_misc.sigmode )
-#define gotsig (G_misc.gotsig )
+#define isloginsh (G_misc.isloginsh )
+#define nullstr (G_misc.nullstr )
+#define optlist (G_misc.optlist )
+#define sigmode (G_misc.sigmode )
+#define gotsig (G_misc.gotsig )
+#define trap (G_misc.trap )
+#define random_galois_LFSR (G_misc.random_galois_LFSR)
+#define random_LCG (G_misc.random_LCG )
+#define backgndpid (G_misc.backgndpid )
+#define job_warning (G_misc.job_warning)
#define INIT_G_misc() do { \
(*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
barrier(); \
} while (0)
-/* ============ Interrupts / exceptions */
+/* ============ DEBUG */
+#if DEBUG
+static void trace_printf(const char *fmt, ...);
+static void trace_vprintf(const char *fmt, va_list va);
+# define TRACE(param) trace_printf param
+# define TRACEV(param) trace_vprintf param
+# define close(fd) do { \
+ int dfd = (fd); \
+ if (close(dfd) < 0) \
+ bb_error_msg("bug on %d: closing %d(%x)", \
+ __LINE__, dfd, dfd); \
+} while (0)
+#else
+# define TRACE(param)
+# define TRACEV(param)
+#endif
+
+/* ============ Utility functions */
+#define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
+
+/* C99 say: "char" declaration may be signed or unsigned by default */
+#define signed_char2int(sc) ((int)(signed char)(sc))
+
+static int isdigit_str9(const char *str)
+{
+ int maxlen = 9 + 1; /* max 9 digits: 999999999 */
+ while (--maxlen && isdigit(*str))
+ str++;
+ return (*str == '\0');
+}
+
+
+/* ============ Interrupts / exceptions */
/*
* These macros allow the user to suspend the handling of interrupt signals
* over a period of time. This is similar to SIGHOLD or to sigblock, but
* much more efficient and portable. (But hacking the kernel is so much
* more fun than worrying about efficiency and portability. :-))
*/
-#define INT_OFF \
- do { \
- suppressint++; \
- xbarrier(); \
- } while (0)
+#define INT_OFF do { \
+ suppressint++; \
+ xbarrier(); \
+} while (0)
/*
* Called to raise an exception. Since C doesn't include exceptions, we
* just do a longjmp to the exception handler. The type of exception is
- * stored in the global variable "exception".
+ * stored in the global variable "exception_type".
*/
-static void raise_exception(int) ATTRIBUTE_NORETURN;
+static void raise_exception(int) NORETURN;
static void
raise_exception(int e)
{
abort();
#endif
INT_OFF;
- exception = e;
+ exception_type = e;
longjmp(exception_handler->loc, 1);
}
+#if DEBUG
+#define raise_exception(e) do { \
+ TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
+ raise_exception(e); \
+} while (0)
+#endif
/*
* Called from trap.c when a SIGINT is received. (If the user specifies
* are held using the INT_OFF macro. (The test for iflag is just
* defensive programming.)
*/
-static void raise_interrupt(void) ATTRIBUTE_NORETURN;
+static void raise_interrupt(void) NORETURN;
static void
raise_interrupt(void)
{
- int i;
- sigset_t mask;
+ int ex_type;
intpending = 0;
/* Signal is not automatically unmasked after it is raised,
* do it ourself - unmask all signals */
- sigemptyset(&mask);
- sigprocmask(SIG_SETMASK, &mask, NULL);
+ sigprocmask_allsigs(SIG_UNBLOCK);
/* pendingsig = 0; - now done in onsig() */
- i = EXSIG;
+ ex_type = EXSIG;
if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
if (!(rootshell && iflag)) {
/* Kill ourself with SIGINT */
signal(SIGINT, SIG_DFL);
raise(SIGINT);
}
- i = EXINT;
+ ex_type = EXINT;
}
- raise_exception(i);
+ raise_exception(ex_type);
/* NOTREACHED */
}
+#if DEBUG
+#define raise_interrupt() do { \
+ TRACE(("raising interrupt on line %d\n", __LINE__)); \
+ raise_interrupt(); \
+} while (0)
+#endif
-#if ENABLE_ASH_OPTIMIZE_FOR_SIZE
-static void
+static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
int_on(void)
{
+ xbarrier();
if (--suppressint == 0 && intpending) {
raise_interrupt();
}
}
#define INT_ON int_on()
-static void
+static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
force_int_on(void)
{
+ xbarrier();
suppressint = 0;
if (intpending)
raise_interrupt();
}
#define FORCE_INT_ON force_int_on()
-#else
-#define INT_ON \
- do { \
- xbarrier(); \
- if (--suppressint == 0 && intpending) \
- raise_interrupt(); \
- } while (0)
-#define FORCE_INT_ON \
- do { \
- xbarrier(); \
- suppressint = 0; \
- if (intpending) \
- raise_interrupt(); \
- } while (0)
-#endif /* ASH_OPTIMIZE_FOR_SIZE */
#define SAVE_INT(v) ((v) = suppressint)
-#define RESTORE_INT(v) \
- do { \
- xbarrier(); \
- suppressint = (v); \
- if (suppressint == 0 && intpending) \
- raise_interrupt(); \
- } while (0)
-
-/*
- * Ignore a signal. Only one usage site - in forkchild()
- */
-static void
-ignoresig(int signo)
-{
- if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
- signal(signo, SIG_IGN);
- }
- sigmode[signo - 1] = S_HARD_IGN;
-}
-
-/*
- * Signal handler. Only one usage site - in setsignal()
- */
-static void
-onsig(int signo)
-{
- gotsig[signo - 1] = 1;
- pendingsig = signo;
-
- if ( /* exsig || */ (signo == SIGINT && !trap[SIGINT])) {
- if (!suppressint) {
- pendingsig = 0;
- raise_interrupt(); /* does not return */
- }
- intpending = 1;
- }
-}
+#define RESTORE_INT(v) do { \
+ xbarrier(); \
+ suppressint = (v); \
+ if (suppressint == 0 && intpending) \
+ raise_interrupt(); \
+} while (0)
/* ============ Stdout/stderr output */
#define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
/* values of VSTYPE field */
-#define VSNORMAL 0x1 /* normal variable: $var or ${var} */
-#define VSMINUS 0x2 /* ${var-text} */
-#define VSPLUS 0x3 /* ${var+text} */
-#define VSQUESTION 0x4 /* ${var?message} */
-#define VSASSIGN 0x5 /* ${var=text} */
-#define VSTRIMRIGHT 0x6 /* ${var%pattern} */
-#define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
-#define VSTRIMLEFT 0x8 /* ${var#pattern} */
-#define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
-#define VSLENGTH 0xa /* ${#var} */
+#define VSNORMAL 0x1 /* normal variable: $var or ${var} */
+#define VSMINUS 0x2 /* ${var-text} */
+#define VSPLUS 0x3 /* ${var+text} */
+#define VSQUESTION 0x4 /* ${var?message} */
+#define VSASSIGN 0x5 /* ${var=text} */
+#define VSTRIMRIGHT 0x6 /* ${var%pattern} */
+#define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
+#define VSTRIMLEFT 0x8 /* ${var#pattern} */
+#define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
+#define VSLENGTH 0xa /* ${#var} */
+#if ENABLE_ASH_BASH_COMPAT
+#define VSSUBSTR 0xc /* ${var:position:length} */
+#define VSREPLACE 0xd /* ${var/pattern/replacement} */
+#define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
+#endif
static const char dolatstr[] ALIGN1 = {
CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
};
-#define NCMD 0
-#define NPIPE 1
-#define NREDIR 2
-#define NBACKGND 3
+#define NCMD 0
+#define NPIPE 1
+#define NREDIR 2
+#define NBACKGND 3
#define NSUBSHELL 4
-#define NAND 5
-#define NOR 6
-#define NSEMI 7
-#define NIF 8
-#define NWHILE 9
-#define NUNTIL 10
-#define NFOR 11
-#define NCASE 12
-#define NCLIST 13
-#define NDEFUN 14
-#define NARG 15
-#define NTO 16
-#define NCLOBBER 17
-#define NFROM 18
-#define NFROMTO 19
-#define NAPPEND 20
-#define NTOFD 21
-#define NFROMFD 22
-#define NHERE 23
-#define NXHERE 24
-#define NNOT 25
+#define NAND 5
+#define NOR 6
+#define NSEMI 7
+#define NIF 8
+#define NWHILE 9
+#define NUNTIL 10
+#define NFOR 11
+#define NCASE 12
+#define NCLIST 13
+#define NDEFUN 14
+#define NARG 15
+#define NTO 16
+#if ENABLE_ASH_BASH_COMPAT
+#define NTO2 17
+#endif
+#define NCLOBBER 18
+#define NFROM 19
+#define NFROMTO 20
+#define NAPPEND 21
+#define NTOFD 22
+#define NFROMFD 23
+#define NHERE 24
+#define NXHERE 25
+#define NNOT 26
+#define N_NUMBER 27
union node;
struct ncmd {
- int type;
+ smallint type; /* Nxxxx */
union node *assign;
union node *args;
union node *redirect;
};
struct npipe {
- int type;
- int backgnd;
+ smallint type;
+ smallint pipe_backgnd;
struct nodelist *cmdlist;
};
struct nredir {
- int type;
+ smallint type;
union node *n;
union node *redirect;
};
struct nbinary {
- int type;
+ smallint type;
union node *ch1;
union node *ch2;
};
struct nif {
- int type;
+ smallint type;
union node *test;
union node *ifpart;
union node *elsepart;
};
struct nfor {
- int type;
+ smallint type;
union node *args;
union node *body;
char *var;
};
struct ncase {
- int type;
+ smallint type;
union node *expr;
union node *cases;
};
struct nclist {
- int type;
+ smallint type;
union node *next;
union node *pattern;
union node *body;
};
struct narg {
- int type;
+ smallint type;
union node *next;
char *text;
struct nodelist *backquote;
};
+/* nfile and ndup layout must match!
+ * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
+ * that it is actually NTO2 (>&file), and change its type.
+ */
struct nfile {
- int type;
+ smallint type;
union node *next;
int fd;
+ int _unused_dupfd;
union node *fname;
char *expfname;
};
struct ndup {
- int type;
+ smallint type;
union node *next;
int fd;
int dupfd;
union node *vname;
+ char *_unused_expfname;
};
struct nhere {
- int type;
+ smallint type;
union node *next;
int fd;
union node *doc;
};
struct nnot {
- int type;
+ smallint type;
union node *com;
};
union node {
- int type;
+ smallint type;
struct ncmd ncmd;
struct npipe npipe;
struct nredir nredir;
if (debug != 1)
return;
+ if (DEBUG_TIME)
+ fprintf(tracefile, "%u ", (int) time(NULL));
+ if (DEBUG_PID)
+ fprintf(tracefile, "[%u] ", (int) getpid());
+ if (DEBUG_SIG)
+ fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pendingsig, intpending, suppressint);
va_start(va, fmt);
vfprintf(tracefile, fmt, va);
va_end(va);
{
if (debug != 1)
return;
+ if (DEBUG_TIME)
+ fprintf(tracefile, "%u ", (int) time(NULL));
+ if (DEBUG_PID)
+ fprintf(tracefile, "[%u] ", (int) getpid());
+ if (DEBUG_SIG)
+ fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pendingsig, intpending, suppressint);
vfprintf(tracefile, fmt, va);
}
case NTO: s = ">>"+1; dftfd = 1; break;
case NCLOBBER: s = ">|"; dftfd = 1; break;
case NAPPEND: s = ">>"; dftfd = 1; break;
+#if ENABLE_ASH_BASH_COMPAT
+ case NTO2:
+#endif
case NTOFD: s = ">&"; dftfd = 1; break;
- case NFROM: s = "<"; break;
+ case NFROM: s = "<"; break;
case NFROMFD: s = "<&"; break;
case NFROMTO: s = "<>"; break;
default: s = "*error*"; break;
if (lp->next)
fputs(" | ", fp);
}
- if (n->npipe.backgnd)
+ if (n->npipe.pipe_backgnd)
fputs(" &", fp);
if (ind >= 0)
putc('\n', fp);
shtree(n, 1, NULL, stdout);
}
-#define TRACE(param) trace_printf param
-#define TRACEV(param) trace_vprintf param
-
-#else
-
-#define TRACE(param)
-#define TRACEV(param)
-
#endif /* DEBUG */
char *text;
};
-#if ENABLE_ASH_ALIAS
struct alias;
-#endif
struct strpush {
struct strpush *prev; /* preceding string on stack */
- char *prevstring;
- int prevnleft;
+ char *prev_string;
+ int prev_left_in_line;
#if ENABLE_ASH_ALIAS
struct alias *ap; /* if push was associated with an alias */
#endif
struct parsefile *prev; /* preceding file on stack */
int linno; /* current line */
int fd; /* file descriptor (or -1 if string) */
- int nleft; /* number of chars left in this line */
- int lleft; /* number of chars left in this buffer */
- char *nextc; /* next char in buffer */
+ int left_in_line; /* number of chars left in this line */
+ int left_in_buffer; /* number of chars left in this buffer past the line */
+ char *next_to_pgetc; /* next char in buffer */
char *buf; /* input buffer */
struct strpush *strpush; /* for pushing strings at this level */
struct strpush basestrpush; /* so pushing one is fast */
};
-static struct parsefile basepf; /* top level input file */
-static struct parsefile *parsefile = &basepf; /* current input file */
+static struct parsefile basepf; /* top level input file */
+static struct parsefile *g_parsefile = &basepf; /* current input file */
static int startlinno; /* line # where last token started */
static char *commandname; /* currently executing command */
static struct strlist *cmdenviron; /* environment for builtin command */
-static int exitstatus; /* exit status of last command */
+static uint8_t exitstatus; /* exit status of last command */
/* ============ Message printing */
if (commandname) {
if (strcmp(arg0, commandname))
fprintf(stderr, "%s: ", commandname);
- if (!iflag || parsefile->fd)
+ if (!iflag || g_parsefile->fd)
fprintf(stderr, "line %d: ", startlinno);
}
vfprintf(stderr, msg, ap);
* is not NULL then error prints an error message using printf style
* formatting. It then raises the error exception.
*/
-static void ash_vmsg_and_raise(int, const char *, va_list) ATTRIBUTE_NORETURN;
+static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
static void
ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
{
/* NOTREACHED */
}
-static void ash_msg_and_raise_error(const char *, ...) ATTRIBUTE_NORETURN;
+static void ash_msg_and_raise_error(const char *, ...) NORETURN;
static void
ash_msg_and_raise_error(const char *msg, ...)
{
va_end(ap);
}
-static void ash_msg_and_raise(int, const char *, ...) ATTRIBUTE_NORETURN;
+static void raise_error_syntax(const char *) NORETURN;
+static void
+raise_error_syntax(const char *msg)
+{
+ ash_msg_and_raise_error("syntax error: %s", msg);
+ /* NOTREACHED */
+}
+
+static void ash_msg_and_raise(int, const char *, ...) NORETURN;
static void
ash_msg_and_raise(int cond, const char *msg, ...)
{
{
#if DEBUG
if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
- write(2, "stunalloc\n", 10);
+ write(STDERR_FILENO, "stunalloc\n", 10);
abort();
}
#endif
INT_ON;
} else {
char *oldspace = g_stacknxt;
- int oldlen = g_stacknleft;
+ size_t oldlen = g_stacknleft;
char *p = stalloc(newlen);
/* free the space we just allocated */
return stackblock();
}
growstackblock();
- return stackblock() + len;
+ return (char *)stackblock() + len;
}
/*
break;
growstackblock();
}
- return stackblock() + len;
+ return (char *)stackblock() + len;
}
static char *
stack_nputstr(const char *s, size_t n, char *p)
{
p = makestrspace(n, p);
- p = memcpy(p, s, n) + n;
+ p = (char *)memcpy(p, s, n) + n;
return p;
}
#define STARTSTACKSTR(p) ((p) = stackblock())
#define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
-#define CHECKSTRSPACE(n, p) \
- do { \
- char *q = (p); \
- size_t l = (n); \
- size_t m = sstrend - q; \
- if (l > m) \
- (p) = makestrspace(l, q); \
- } while (0)
-#define USTPUTC(c, p) (*p++ = (c))
-#define STACKSTRNUL(p) \
- do { \
- if ((p) == sstrend) \
- p = growstackstr(); \
- *p = '\0'; \
- } while (0)
-#define STUNPUTC(p) (--p)
-#define STTOPC(p) (p[-1])
-#define STADJUST(amount, p) (p += (amount))
+#define CHECKSTRSPACE(n, p) do { \
+ char *q = (p); \
+ size_t l = (n); \
+ size_t m = sstrend - q; \
+ if (l > m) \
+ (p) = makestrspace(l, q); \
+} while (0)
+#define USTPUTC(c, p) (*(p)++ = (c))
+#define STACKSTRNUL(p) do { \
+ if ((p) == sstrend) \
+ (p) = growstackstr(); \
+ *(p) = '\0'; \
+} while (0)
+#define STUNPUTC(p) (--(p))
+#define STTOPC(p) ((p)[-1])
+#define STADJUST(amount, p) ((p) += (amount))
#define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
-#define ungrabstackstr(s, p) stunalloc((s))
+#define ungrabstackstr(s, p) stunalloc(s)
#define stackstrend() ((void *)sstrend)
q = p = makestrspace(len + 3, p);
*q++ = '\'';
- q = memcpy(q, s, len) + len;
+ q = (char *)memcpy(q, s, len) + len;
*q++ = '\'';
s += len;
q = p = makestrspace(len + 3, p);
*q++ = '"';
- q = memcpy(q, s, len) + len;
+ q = (char *)memcpy(q, s, len) + len;
*q++ = '"';
s += len;
static char *optptr; /* used by nextopt */
/*
- * XXX - should get rid of. have all builtins use getopt(3). the
- * library getopt must have the BSD extension static variable "optreset"
- * otherwise it can't be used within the shell safely.
+ * XXX - should get rid of. Have all builtins use getopt(3).
+ * The library getopt must have the BSD extension static variable
+ * "optreset", otherwise it can't be used within the shell safely.
*
- * Standard option processing (a la getopt) for builtin routines. The
- * only argument that is passed to nextopt is the option string; the
- * other arguments are unnecessary. It return the character, or '\0' on
- * end of input.
+ * Standard option processing (a la getopt) for builtin routines.
+ * The only argument that is passed to nextopt is the option string;
+ * the other arguments are unnecessary. It returns the character,
+ * or '\0' on end of input.
*/
static int
nextopt(const char *optstring)
p = optptr;
if (p == NULL || *p == '\0') {
+ /* We ate entire "-param", take next one */
p = *argptr;
- if (p == NULL || *p != '-' || *++p == '\0')
+ if (p == NULL)
+ return '\0';
+ if (*p != '-')
+ return '\0';
+ if (*++p == '\0') /* just "-" ? */
return '\0';
argptr++;
- if (LONE_DASH(p)) /* check for "--" */
+ if (LONE_DASH(p)) /* "--" ? */
return '\0';
+ /* p => next "-param" */
}
+ /* p => some option char in the middle of a "-param" */
c = *p++;
- for (q = optstring; *q != c; ) {
+ for (q = optstring; *q != c;) {
if (*q == '\0')
ash_msg_and_raise_error("illegal option -%c", c);
if (*++q == ':')
q++;
}
if (*++q == ':') {
- if (*p == '\0' && (p = *argptr++) == NULL)
- ash_msg_and_raise_error("no arg for -%c option", c);
+ if (*p == '\0') {
+ p = *argptr++;
+ if (p == NULL)
+ ash_msg_and_raise_error("no arg for -%c option", c);
+ }
optionarg = p;
p = NULL;
}
}
-/* ============ Math support definitions */
-
-#if ENABLE_ASH_MATH_SUPPORT_64
-typedef int64_t arith_t;
-#define arith_t_type long long
-#else
-typedef long arith_t;
-#define arith_t_type long
-#endif
-
-#if ENABLE_ASH_MATH_SUPPORT
-static arith_t dash_arith(const char *);
-static arith_t arith(const char *expr, int *perrcode);
-#endif
-
-#if ENABLE_ASH_RANDOM_SUPPORT
-static unsigned long rseed;
-#ifndef DYNAMIC_VAR
-#define DYNAMIC_VAR
-#endif
-#endif
-
-
/* ============ Shell variables */
/*
* The parsefile structure pointed to by the global variable parsefile
* contains information about the current file being read.
*/
-struct redirtab {
- struct redirtab *next;
- int renamed[10];
- int nullredirs;
-};
-
struct shparam {
int nparam; /* # of positional parameters (without $0) */
#if ENABLE_ASH_GETOPTS
static void
freeparam(volatile struct shparam *param)
{
- char **ap;
-
if (param->malloced) {
- for (ap = param->p; *ap; ap++)
- free(*ap);
- free(param->p);
+ char **ap, **ap1;
+ ap = ap1 = param->p;
+ while (*ap)
+ free(*ap++);
+ free(ap1);
}
}
#define VNOFUNC 0x40 /* don't call the callback function */
#define VNOSET 0x80 /* do not set variable - just readonly test */
#define VNOSAVE 0x100 /* when text is on the heap before setvareq */
-#ifdef DYNAMIC_VAR
+#if ENABLE_ASH_RANDOM_SUPPORT
# define VDYNAMIC 0x200 /* dynamic variable */
#else
# define VDYNAMIC 0
#endif
};
+struct redirtab;
struct globals_var {
struct shparam shellparam; /* $@ current positional parameters */
extern struct globals_var *const ash_ptr_to_globals_var;
#define G_var (*ash_ptr_to_globals_var)
#define shellparam (G_var.shellparam )
-#define redirlist (G_var.redirlist )
+//#define redirlist (G_var.redirlist )
#define g_nullredirs (G_var.g_nullredirs )
#define preverrout_fd (G_var.preverrout_fd)
#define vartab (G_var.vartab )
#define varinit (G_var.varinit )
#define INIT_G_var() do { \
- int i; \
+ unsigned i; \
(*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
barrier(); \
for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
/*
* Find the value of a variable. Returns NULL if not set.
*/
-static char *
+static const char *
lookupvar(const char *name)
{
struct var *v;
v = *findvar(hashvar(name), name);
if (v) {
-#ifdef DYNAMIC_VAR
+#if ENABLE_ASH_RANDOM_SUPPORT
/*
* Dynamic variables are implemented roughly the same way they are
* in bash. Namely, they're "special" so long as they aren't unset.
/*
* Search the environment of a builtin command.
*/
-static char *
+static const char *
bltinlookup(const char *name)
{
struct strlist *sp;
}
INT_OFF;
nameeq = ckmalloc(namelen + vallen + 2);
- p = memcpy(nameeq, name, namelen) + namelen;
+ p = (char *)memcpy(nameeq, name, namelen) + namelen;
if (val) {
*p++ = '=';
- p = memcpy(p, val, vallen) + vallen;
+ p = (char *)memcpy(p, val, vallen) + vallen;
}
*p = '\0';
setvareq(nameeq, flags | VNOSAVE);
retval = 1;
if (flags & VREADONLY)
goto out;
-#ifdef DYNAMIC_VAR
+#if ENABLE_ASH_RANDOM_SUPPORT
vp->flags &= ~VDYNAMIC;
#endif
if (flags & VUNSET)
if (*path == NULL)
return NULL;
start = *path;
- for (p = start; *p && *p != ':' && *p != '%'; p++);
+ for (p = start; *p && *p != ':' && *p != '%'; p++)
+ continue;
len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
while (stackblocksize() < len)
growstackblock();
pathopt = NULL;
if (*p == '%') {
pathopt = ++p;
- while (*p && *p != ':') p++;
+ while (*p && *p != ':')
+ p++;
}
if (*p == ':')
*path = p + 1;
new = stack_putstr(curdir, new);
}
new = makestrspace(strlen(dir) + 2, new);
- lim = stackblock() + 1;
+ lim = (char *)stackblock() + 1;
if (*dir != '/') {
if (new[-1] != '/')
USTPUTC('/', new);
}
static int
-cdcmd(int argc, char **argv)
+cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
const char *dest;
const char *path;
}
static int
-pwdcmd(int argc, char **argv)
+pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
int flags;
const char *dir = curdir;
/* ============ ... */
+
#define IBUFSIZ COMMON_BUFSIZE
-#define basebuf bb_common_bufsiz1 /* buffer for top level input file */
+/* buffer for top level input file */
+#define basebuf bb_common_bufsiz1
/* Syntax classes */
-#define CWORD 0 /* character is nothing special */
-#define CNL 1 /* newline character */
-#define CBACK 2 /* a backslash character */
-#define CSQUOTE 3 /* single quote */
-#define CDQUOTE 4 /* double quote */
+#define CWORD 0 /* character is nothing special */
+#define CNL 1 /* newline character */
+#define CBACK 2 /* a backslash character */
+#define CSQUOTE 3 /* single quote */
+#define CDQUOTE 4 /* double quote */
#define CENDQUOTE 5 /* a terminating quote */
-#define CBQUOTE 6 /* backwards single quote */
-#define CVAR 7 /* a dollar sign */
-#define CENDVAR 8 /* a '}' character */
-#define CLP 9 /* a left paren in arithmetic */
-#define CRP 10 /* a right paren in arithmetic */
+#define CBQUOTE 6 /* backwards single quote */
+#define CVAR 7 /* a dollar sign */
+#define CENDVAR 8 /* a '}' character */
+#define CLP 9 /* a left paren in arithmetic */
+#define CRP 10 /* a right paren in arithmetic */
#define CENDFILE 11 /* end of file */
-#define CCTL 12 /* like CWORD, except it must be escaped */
-#define CSPCL 13 /* these terminate a word */
-#define CIGN 14 /* character should be ignored */
+#define CCTL 12 /* like CWORD, except it must be escaped */
+#define CSPCL 13 /* these terminate a word */
+#define CIGN 14 /* character should be ignored */
#if ENABLE_ASH_ALIAS
-#define SYNBASE 130
-#define PEOF -130
-#define PEOA -129
+#define SYNBASE 130
+#define PEOF -130
+#define PEOA -129
#define PEOA_OR_PEOF PEOA
#else
-#define SYNBASE 129
-#define PEOF -129
+#define SYNBASE 129
+#define PEOF -129
#define PEOA_OR_PEOF PEOF
#endif
#define USE_SIT_FUNCTION
#endif
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
static const char S_I_T[][4] = {
#if ENABLE_ASH_ALIAS
{ CSPCL, CIGN, CIGN, CIGN }, /* 0, PEOA */
{ CCTL, CCTL, CCTL } /* 14, CTLESC ... */
#endif
};
-#endif /* ASH_MATH_SUPPORT */
+#endif /* SH_MATH_SUPPORT */
#ifdef USE_SIT_FUNCTION
const char *s;
int indx;
- if (c == PEOF) /* 2^8+2 */
+ if (c == PEOF) { /* 2^8+2 */
return CENDFILE;
+ }
#if ENABLE_ASH_ALIAS
- if (c == PEOA) /* 2^8+1 */
+ if (c == PEOA) { /* 2^8+1 */
indx = 0;
- else
+ } else
#endif
-#define U_C(c) ((unsigned char)(c))
-
- if ((unsigned char)c >= (unsigned char)(CTLESC)
- && (unsigned char)c <= (unsigned char)(CTLQUOTEMARK)
- ) {
- return CCTL;
- } else {
- s = strchr(spec_symbls, c);
- if (s == NULL || *s == '\0')
+ {
+ if ((unsigned char)c >= (unsigned char)(CTLESC)
+ && (unsigned char)c <= (unsigned char)(CTLQUOTEMARK)
+ ) {
+ return CCTL;
+ }
+ s = strchrnul(spec_symbls, c);
+ if (*s == '\0') {
return CWORD;
- indx = syntax_index_table[(s - spec_symbls)];
+ }
+ indx = syntax_index_table[s - spec_symbls];
}
return S_I_T[indx][syntax];
}
/* 257 127 */ CWORD_CWORD_CWORD_CWORD,
};
-#define SIT(c, syntax) (S_I_T[(int)syntax_index_table[((int)c)+SYNBASE]][syntax])
+#define SIT(c, syntax) (S_I_T[(int)syntax_index_table[(int)(c) + SYNBASE]][syntax])
#endif /* USE_SIT_FUNCTION */
* TODO - sort output
*/
static int
-aliascmd(int argc, char **argv)
+aliascmd(int argc UNUSED_PARAM, char **argv)
{
char *n, *v;
int ret = 0;
struct alias *ap;
- if (argc == 1) {
+ if (!argv[1]) {
int i;
- for (i = 0; i < ATABSIZE; i++)
+ for (i = 0; i < ATABSIZE; i++) {
for (ap = atab[i]; ap; ap = ap->next) {
printalias(ap);
}
+ }
return 0;
}
while ((n = *++argv) != NULL) {
}
static int
-unaliascmd(int argc, char **argv)
+unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
int i;
struct job *prev_job; /* previous job */
};
-static pid_t backgndpid; /* pid of last background process */
-static smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
-
-static struct job *makejob(union node *, int);
+static struct job *makejob(/*union node *,*/ int);
+#if !JOBS
+#define forkshell(job, node, mode) forkshell(job, mode)
+#endif
static int forkshell(struct job *, union node *, int);
static int waitforjob(struct job *);
#if !JOBS
-enum { jobctl = 0 };
+enum { doing_jobctl = 0 };
#define setjobctl(on) do {} while (0)
#else
-static smallint jobctl; /* true if doing job control */
+static smallint doing_jobctl; //references:8
static void setjobctl(int);
#endif
+/*
+ * Ignore a signal.
+ */
+static void
+ignoresig(int signo)
+{
+ /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
+ if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
+ /* No, need to do it */
+ signal(signo, SIG_IGN);
+ }
+ sigmode[signo - 1] = S_HARD_IGN;
+}
+
+/*
+ * Signal handler. Only one usage site - in setsignal()
+ */
+static void
+onsig(int signo)
+{
+ gotsig[signo - 1] = 1;
+
+ if (/* exsig || */ (signo == SIGINT && !trap[SIGINT])) {
+ if (!suppressint) {
+ pendingsig = 0;
+ raise_interrupt(); /* does not return */
+ }
+ intpending = 1;
+ } else {
+ pendingsig = signo;
+ }
+}
+
/*
* Set the signal handler for the specified signal. The routine figures
* out what it should be set to.
static void
setsignal(int signo)
{
- int action;
- char *t, tsig;
+ char *t;
+ char cur_act, new_act;
struct sigaction act;
t = trap[signo];
- action = S_IGN;
- if (t == NULL)
- action = S_DFL;
- else if (*t != '\0')
- action = S_CATCH;
- if (rootshell && action == S_DFL) {
+ new_act = S_DFL;
+ if (t != NULL) { /* trap for this sig is set */
+ new_act = S_CATCH;
+ if (t[0] == '\0') /* trap is "": ignore this sig */
+ new_act = S_IGN;
+ }
+
+ if (rootshell && new_act == S_DFL) {
switch (signo) {
case SIGINT:
if (iflag || minusc || sflag == 0)
- action = S_CATCH;
+ new_act = S_CATCH;
break;
case SIGQUIT:
#if DEBUG
if (debug)
break;
#endif
- /* FALLTHROUGH */
+ /* man bash:
+ * "In all cases, bash ignores SIGQUIT. Non-builtin
+ * commands run by bash have signal handlers
+ * set to the values inherited by the shell
+ * from its parent". */
+ new_act = S_IGN;
+ break;
case SIGTERM:
if (iflag)
- action = S_IGN;
+ new_act = S_IGN;
break;
#if JOBS
case SIGTSTP:
case SIGTTOU:
if (mflag)
- action = S_IGN;
+ new_act = S_IGN;
break;
#endif
}
}
+//TODO: if !rootshell, we reset SIGQUIT to DFL,
+//whereas we have to restore it to what shell got on entry
+//from the parent. See comment above
t = &sigmode[signo - 1];
- tsig = *t;
- if (tsig == 0) {
- /*
- * current setting unknown
- */
- if (sigaction(signo, NULL, &act) == -1) {
- /*
- * Pretend it worked; maybe we should give a warning
- * here, but other shells don't. We don't alter
- * sigmode, so that we retry every time.
- */
+ cur_act = *t;
+ if (cur_act == 0) {
+ /* current setting is not yet known */
+ if (sigaction(signo, NULL, &act)) {
+ /* pretend it worked; maybe we should give a warning,
+ * but other shells don't. We don't alter sigmode,
+ * so we retry every time.
+ * btw, in Linux it never fails. --vda */
return;
}
- tsig = S_RESET; /* force to be set */
if (act.sa_handler == SIG_IGN) {
- tsig = S_HARD_IGN;
+ cur_act = S_HARD_IGN;
if (mflag
&& (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
) {
- tsig = S_IGN; /* don't hard ignore these */
+ cur_act = S_IGN; /* don't hard ignore these */
}
}
}
- if (tsig == S_HARD_IGN || tsig == action)
+ if (cur_act == S_HARD_IGN || cur_act == new_act)
return;
+
act.sa_handler = SIG_DFL;
- switch (action) {
+ switch (new_act) {
case S_CATCH:
act.sa_handler = onsig;
+ act.sa_flags = 0; /* matters only if !DFL and !IGN */
+ sigfillset(&act.sa_mask); /* ditto */
break;
case S_IGN:
act.sa_handler = SIG_IGN;
break;
}
- *t = action;
- act.sa_flags = 0;
- sigfillset(&act.sa_mask);
sigaction_set(signo, &act);
+
+ *t = new_act;
}
/* mode flags for set_curjob */
#if JOBS
/* pgrp of shell on invocation */
-static int initialpgrp;
-static int ttyfd = -1;
+static int initialpgrp; //references:2
+static int ttyfd = -1; //5
#endif
/* array of jobs */
-static struct job *jobtab;
+static struct job *jobtab; //5
/* size of array */
-static unsigned njobs;
+static unsigned njobs; //4
/* current job */
-static struct job *curjob;
+static struct job *curjob; //lots
/* number of presumed living untracked jobs */
-static int jobless;
+static int jobless; //4
static void
set_curjob(struct job *jp, unsigned mode)
/*
* Convert a job name to a job structure.
*/
+#if !JOBS
+#define getjob(name, getctl) getjob(name)
+#endif
static struct job *
getjob(const char *name, int getctl)
{
}
if (is_number(p)) {
+// TODO: number() instead? It does error checking...
num = atoi(p);
if (num < njobs) {
jp = jobtab + num - 1;
xtcsetpgrp(int fd, pid_t pgrp)
{
if (tcsetpgrp(fd, pgrp))
- ash_msg_and_raise_error("cannot set tty process group (%m)");
+ ash_msg_and_raise_error("can't set tty process group (%m)");
}
/*
int fd;
int pgrp;
- if (on == jobctl || rootshell == 0)
+ if (on == doing_jobctl || rootshell == 0)
return;
if (on) {
int ofd;
fd = -1;
}
ttyfd = fd;
- jobctl = on;
+ doing_jobctl = on;
}
static int
killcmd(int argc, char **argv)
{
+ int i = 1;
if (argv[1] && strcmp(argv[1], "-l") != 0) {
- int i = 1;
do {
if (argv[i][0] == '%') {
struct job *jp = getjob(argv[i], 0);
}
static int
-fg_bgcmd(int argc, char **argv)
+fg_bgcmd(int argc UNUSED_PARAM, char **argv)
{
struct job *jp;
FILE *out;
return col;
}
-/*
- * Do a wait system call. If job control is compiled in, we accept
- * stopped processes. If block is zero, we return a value of zero
- * rather than blocking.
- *
- * System V doesn't have a non-blocking wait system call. It does
- * have a SIGCLD signal that is sent to a process when one of it's
- * children dies. The obvious way to use SIGCLD would be to install
- * a handler for SIGCLD which simply bumped a counter when a SIGCLD
- * was received, and have waitproc bump another counter when it got
- * the status of a process. Waitproc would then know that a wait
- * system call would not block if the two counters were different.
- * This approach doesn't work because if a process has children that
- * have not been waited for, System V will send it a SIGCLD when it
- * installs a signal handler for SIGCLD. What this means is that when
- * a child exits, the shell will be sent SIGCLD signals continuously
- * until is runs out of stack space, unless it does a wait call before
- * restoring the signal handler. The code below takes advantage of
- * this (mis)feature by installing a signal handler for SIGCLD and
- * then checking to see whether it was called. If there are any
- * children to be waited for, it will be.
- *
- * If neither SYSV nor BSD is defined, we don't implement nonblocking
- * waits at all. In this case, the user will not be informed when
- * a background process until the next time she runs a real program
- * (as opposed to running a builtin command or just typing return),
- * and the jobs command may give out of date information.
- */
-static int
-waitproc(int wait_flags, int *status)
-{
-#if JOBS
- if (jobctl)
- wait_flags |= WUNTRACED;
-#endif
- /* NB: _not_ safe_waitpid, we need to detect EINTR */
- return waitpid(-1, status, wait_flags);
-}
-
-/*
- * Wait for a process to terminate.
- */
static int
dowait(int wait_flags, struct job *job)
{
struct job *thisjob;
int state;
- TRACE(("dowait(%d) called\n", wait_flags));
- pid = waitproc(wait_flags, &status);
- TRACE(("wait returns pid=%d, status=%d\n", pid, status));
- if (pid <= 0) {
- /* If we were doing blocking wait and (probably) got EINTR,
- * check for pending sigs received while waiting.
- * (NB: can be moved into callers if needed) */
- if (wait_flags == DOWAIT_BLOCK && pendingsig)
- raise_exception(EXSIG);
+ TRACE(("dowait(0x%x) called\n", wait_flags));
+
+ /* Do a wait system call. If job control is compiled in, we accept
+ * stopped processes. wait_flags may have WNOHANG, preventing blocking.
+ * NB: _not_ safe_waitpid, we need to detect EINTR */
+ pid = waitpid(-1, &status,
+ (doing_jobctl ? (wait_flags | WUNTRACED) : wait_flags));
+ TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
+ pid, status, errno, strerror(errno)));
+ if (pid <= 0)
return pid;
- }
+
INT_OFF;
thisjob = NULL;
for (jp = curjob; jp; jp = jp->prev_job) {
return pid;
}
+static int
+blocking_wait_with_raise_on_sig(struct job *job)
+{
+ pid_t pid = dowait(DOWAIT_BLOCK, job);
+ if (pid <= 0 && pendingsig)
+ raise_exception(EXSIG);
+ return pid;
+}
+
#if JOBS
static void
showjob(FILE *out, struct job *jp, int mode)
TRACE(("showjobs(%x) called\n", mode));
- /* If not even one job changed, there is nothing to do */
+ /* Handle all finished jobs */
while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
continue;
}
static int
-jobscmd(int argc, char **argv)
+jobscmd(int argc UNUSED_PARAM, char **argv)
{
int mode, m;
}
static int
-waitcmd(int argc, char **argv)
+waitcmd(int argc UNUSED_PARAM, char **argv)
{
struct job *job;
int retval;
jp->waited = 1;
jp = jp->prev_job;
}
- dowait(DOWAIT_BLOCK, NULL);
+ /* man bash:
+ * "When bash is waiting for an asynchronous command via
+ * the wait builtin, the reception of a signal for which a trap
+ * has been set will cause the wait builtin to return immediately
+ * with an exit status greater than 128, immediately after which
+ * the trap is executed."
+ * Do we do it that way? */
+ blocking_wait_with_raise_on_sig(NULL);
}
}
job = getjob(*argv, 0);
/* loop until process terminated or stopped */
while (job->state == JOBRUNNING)
- dowait(DOWAIT_BLOCK, NULL);
+ blocking_wait_with_raise_on_sig(NULL);
job->waited = 1;
retval = getstatus(job);
- repeat:
- ;
+ repeat: ;
} while (*++argv);
ret:
* Called with interrupts off.
*/
static struct job *
-makejob(union node *node, int nprocs)
+makejob(/*union node *node,*/ int nprocs)
{
int i;
struct job *jp;
if (jp->state != JOBDONE || !jp->waited)
continue;
#if JOBS
- if (jobctl)
+ if (doing_jobctl)
continue;
#endif
freejob(jp);
#if JOBS
/* jp->jobctl is a bitfield.
* "jp->jobctl |= jobctl" likely to give awful code */
- if (jobctl)
+ if (doing_jobctl)
jp->jobctl = 1;
#endif
jp->prev_job = curjob;
if (nprocs > 1) {
jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
}
- TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs,
+ TRACE(("makejob(%d) returns %%%d\n", nprocs,
jobno(jp)));
return jp;
}
static void
cmdputs(const char *s)
{
+ static const char vstype[VSTYPE + 1][3] = {
+ "", "}", "-", "+", "?", "=",
+ "%", "%%", "#", "##"
+ IF_ASH_BASH_COMPAT(, ":", "/", "//")
+ };
+
const char *p, *str;
char c, cc[2] = " ";
char *nextc;
int subtype = 0;
int quoted = 0;
- static const char vstype[VSTYPE + 1][4] = {
- "", "}", "-", "+", "?", "=",
- "%", "%%", "#", "##"
- };
nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
p = s;
while ((c = *p++) != 0) {
- str = 0;
+ str = NULL;
switch (c) {
case CTLESC:
c = *p++;
case CTLBACKQ+CTLQUOTE:
str = "\"$(...)\"";
goto dostr;
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
case CTLARI:
str = "$((";
goto dostr;
union node *np;
struct nodelist *lp;
const char *p;
- char s[2];
if (!n)
return;
case NAPPEND:
p = ">>";
goto redir;
+#if ENABLE_ASH_BASH_COMPAT
+ case NTO2:
+#endif
case NTOFD:
p = ">&";
goto redir;
case NFROMTO:
p = "<>";
redir:
- s[0] = n->nfile.fd + '0';
- s[1] = '\0';
- cmdputs(s);
+ cmdputs(utoa(n->nfile.fd));
cmdputs(p);
if (n->type == NTOFD || n->type == NFROMFD) {
- s[0] = n->ndup.dupfd + '0';
- p = s;
- goto dotail2;
+ cmdputs(utoa(n->ndup.dupfd));
+ break;
}
n = n->nfile.fname;
goto donode;
/* Called after fork(), in child */
static void
-forkchild(struct job *jp, union node *n, int mode)
+forkchild(struct job *jp, /*union node *n,*/ int mode)
{
int oldlvl;
oldlvl = shlvl;
shlvl++;
+ /* man bash: "Non-builtin commands run by bash have signal handlers
+ * set to the values inherited by the shell from its parent".
+ * Do we do it correctly? */
+
closescript();
clear_traps();
#if JOBS
/* do job control only in root shell */
- jobctl = 0;
+ doing_jobctl = 0;
if (mode != FORK_NOJOB && jp->jobctl && !oldlvl) {
pid_t pgrp;
pgrp = getpid();
else
pgrp = jp->ps[0].pid;
- /* This can fail because we are doing it in the parent also */
- (void)setpgid(0, pgrp);
+ /* this can fail because we are doing it in the parent also */
+ setpgid(0, pgrp);
if (mode == FORK_FG)
xtcsetpgrp(ttyfd, pgrp);
setsignal(SIGTSTP);
} else
#endif
if (mode == FORK_BG) {
+ /* man bash: "When job control is not in effect,
+ * asynchronous commands ignore SIGINT and SIGQUIT" */
ignoresig(SIGINT);
ignoresig(SIGQUIT);
if (jp->nprocs == 0) {
close(0);
if (open(bb_dev_null, O_RDONLY) != 0)
- ash_msg_and_raise_error("can't open %s", bb_dev_null);
+ ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
}
}
- if (!oldlvl && iflag) {
- setsignal(SIGINT);
+ if (!oldlvl) {
+ if (iflag) { /* why if iflag only? */
+ setsignal(SIGINT);
+ setsignal(SIGTERM);
+ }
+ /* man bash:
+ * "In all cases, bash ignores SIGQUIT. Non-builtin
+ * commands run by bash have signal handlers
+ * set to the values inherited by the shell
+ * from its parent".
+ * Take care of the second rule: */
setsignal(SIGQUIT);
- setsignal(SIGTERM);
}
for (jp = curjob; jp; jp = jp->prev_job)
freejob(jp);
}
/* Called after fork(), in parent */
+#if !JOBS
+#define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
+#endif
static void
forkparent(struct job *jp, union node *n, int mode, pid_t pid)
{
ps->status = -1;
ps->cmd = nullstr;
#if JOBS
- if (jobctl && n)
+ if (doing_jobctl && n)
ps->cmd = commandtext(n);
#endif
}
TRACE(("Fork failed, errno=%d", errno));
if (jp)
freejob(jp);
- ash_msg_and_raise_error("cannot fork");
+ ash_msg_and_raise_error("can't fork");
}
if (pid == 0)
- forkchild(jp, n, mode);
+ forkchild(jp, /*n,*/ mode);
else
forkparent(jp, n, mode, pid);
return pid;
/*
* Wait for job to finish.
*
- * Under job control we have the problem that while a child process is
- * running interrupts generated by the user are sent to the child but not
- * to the shell. This means that an infinite loop started by an inter-
- * active user may be hard to kill. With job control turned off, an
- * interactive user may place an interactive program inside a loop. If
- * the interactive program catches interrupts, the user doesn't want
+ * Under job control we have the problem that while a child process
+ * is running interrupts generated by the user are sent to the child
+ * but not to the shell. This means that an infinite loop started by
+ * an interactive user may be hard to kill. With job control turned off,
+ * an interactive user may place an interactive program inside a loop.
+ * If the interactive program catches interrupts, the user doesn't want
* these interrupts to also abort the loop. The approach we take here
* is to have the shell ignore interrupt signals while waiting for a
* foreground process to terminate, and then send itself an interrupt
int st;
TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
+
+ INT_OFF;
while (jp->state == JOBRUNNING) {
+ /* In non-interactive shells, we _can_ get
+ * a keyboard signal here and be EINTRed,
+ * but we just loop back, waiting for command to complete.
+ *
+ * man bash:
+ * "If bash is waiting for a command to complete and receives
+ * a signal for which a trap has been set, the trap
+ * will not be executed until the command completes."
+ *
+ * Reality is that even if trap is not set, bash
+ * will not act on the signal until command completes.
+ * Try this. sleep5intoff.c:
+ * #include <signal.h>
+ * #include <unistd.h>
+ * int main() {
+ * sigset_t set;
+ * sigemptyset(&set);
+ * sigaddset(&set, SIGINT);
+ * sigaddset(&set, SIGQUIT);
+ * sigprocmask(SIG_BLOCK, &set, NULL);
+ * sleep(5);
+ * return 0;
+ * }
+ * $ bash -c './sleep5intoff; echo hi'
+ * ^C^C^C^C <--- pressing ^C once a second
+ * $ _
+ * $ bash -c './sleep5intoff; echo hi'
+ * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
+ * $ _
+ */
dowait(DOWAIT_BLOCK, jp);
}
+ INT_ON;
+
st = getstatus(jp);
#if JOBS
if (jp->jobctl) {
#define EMPTY -2 /* marks an unused slot in redirtab */
#define CLOSED -3 /* marks a slot of previously-closed fd */
-#ifndef PIPE_BUF
-# define PIPESIZE 4096 /* amount of buffering in a pipe */
-#else
-# define PIPESIZE PIPE_BUF
-#endif
/*
* Open a file in noclobber mode.
ash_msg_and_raise_error("pipe call failed");
if (redir->type == NHERE) {
len = strlen(redir->nhere.doc->narg.text);
- if (len <= PIPESIZE) {
+ if (len <= PIPE_BUF) {
full_write(pip[1], redir->nhere.doc->narg.text, len);
goto out;
}
}
if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
+ /* child */
close(pip[0]);
- signal(SIGINT, SIG_IGN);
- signal(SIGQUIT, SIG_IGN);
- signal(SIGHUP, SIG_IGN);
-#ifdef SIGTSTP
- signal(SIGTSTP, SIG_IGN);
-#endif
+ ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
+ ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
+ ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
+ ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
signal(SIGPIPE, SIG_DFL);
if (redir->type == NHERE)
full_write(pip[1], redir->nhere.doc->narg.text, len);
- else
+ else /* NXHERE */
expandhere(redir->nhere.doc, pip[1]);
- _exit(0);
+ _exit(EXIT_SUCCESS);
}
out:
close(pip[1]);
goto ecreate;
break;
case NTO:
+#if ENABLE_ASH_BASH_COMPAT
+ case NTO2:
+#endif
/* Take care of noclobber mode. */
if (Cflag) {
fname = redir->nfile.expfname;
abort();
#endif
/* Fall through to eliminate warning. */
- case NTOFD:
- case NFROMFD:
- f = -1;
- break;
+/* Our single caller does this itself */
+// case NTOFD:
+// case NFROMFD:
+// f = -1;
+// break;
case NHERE:
case NXHERE:
f = openhere(redir);
return f;
ecreate:
- ash_msg_and_raise_error("cannot create %s: %s", fname, errmsg(errno, "nonexistent directory"));
+ ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
eopen:
- ash_msg_and_raise_error("cannot open %s: %s", fname, errmsg(errno, "no such file"));
+ ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
}
/*
* if the source file descriptor is closed, EMPTY if there are no unused
* file descriptors left.
*/
+/* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
+ * old code was doing close(to) prior to copyfd() to achieve the same */
+enum {
+ COPYFD_EXACT = (int)~(INT_MAX),
+ COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
+};
static int
copyfd(int from, int to)
{
int newfd;
- newfd = fcntl(from, F_DUPFD, to);
+ if (to & COPYFD_EXACT) {
+ to &= ~COPYFD_EXACT;
+ /*if (from != to)*/
+ newfd = dup2(from, to);
+ } else {
+ newfd = fcntl(from, F_DUPFD, to);
+ }
if (newfd < 0) {
if (errno == EMFILE)
return EMPTY;
+ /* Happens when source fd is not open: try "echo >&99" */
ash_msg_and_raise_error("%d: %m", from);
}
return newfd;
}
-static void
-dupredirect(union node *redir, int f)
+/* Struct def and variable are moved down to the first usage site */
+struct two_fd_t {
+ int orig, copy;
+};
+struct redirtab {
+ struct redirtab *next;
+ int nullredirs;
+ int pair_count;
+ struct two_fd_t two_fd[0];
+};
+#define redirlist (G_var.redirlist)
+
+static int need_to_remember(struct redirtab *rp, int fd)
{
- int fd = redir->nfile.fd;
+ int i;
+
+ if (!rp) /* remembering was not requested */
+ return 0;
- if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
- if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
- copyfd(redir->ndup.dupfd, fd);
+ for (i = 0; i < rp->pair_count; i++) {
+ if (rp->two_fd[i].orig == fd) {
+ /* already remembered */
+ return 0;
}
- return;
}
+ return 1;
+}
- if (f != fd) {
- copyfd(f, fd);
- close(f);
+/* "hidden" fd is a fd used to read scripts, or a copy of such */
+static int is_hidden_fd(struct redirtab *rp, int fd)
+{
+ int i;
+ struct parsefile *pf;
+
+ if (fd == -1)
+ return 0;
+ pf = g_parsefile;
+ while (pf) {
+ if (fd == pf->fd) {
+ return 1;
+ }
+ pf = pf->prev;
+ }
+ if (!rp)
+ return 0;
+ fd |= COPYFD_RESTORE;
+ for (i = 0; i < rp->pair_count; i++) {
+ if (rp->two_fd[i].copy == fd) {
+ return 1;
+ }
}
+ return 0;
}
/*
static void
redirect(union node *redir, int flags)
{
- union node *n;
struct redirtab *sv;
+ int sv_pos;
int i;
int fd;
int newfd;
+ int copied_fd2 = -1;
g_nullredirs++;
if (!redir) {
return;
}
+
sv = NULL;
+ sv_pos = 0;
INT_OFF;
if (flags & REDIR_PUSH) {
- sv = ckmalloc(sizeof(*sv));
+ union node *tmp = redir;
+ do {
+ sv_pos++;
+#if ENABLE_ASH_BASH_COMPAT
+ if (redir->nfile.type == NTO2)
+ sv_pos++;
+#endif
+ tmp = tmp->nfile.next;
+ } while (tmp);
+ sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
sv->next = redirlist;
+ sv->pair_count = sv_pos;
redirlist = sv;
sv->nullredirs = g_nullredirs - 1;
- for (i = 0; i < 10; i++)
- sv->renamed[i] = EMPTY;
g_nullredirs = 0;
+ while (sv_pos > 0) {
+ sv_pos--;
+ sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
+ }
}
- n = redir;
+
do {
- fd = n->nfile.fd;
- if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD)
- && n->ndup.dupfd == fd)
- continue; /* redirect from/to same file descriptor */
-
- newfd = openredirect(n);
- if (fd == newfd) {
- /* Descriptor wasn't open before redirect.
- * Mark it for close in the future */
- if (sv && sv->renamed[fd] == EMPTY)
- sv->renamed[fd] = CLOSED;
- continue;
+ fd = redir->nfile.fd;
+ if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
+ int right_fd = redir->ndup.dupfd;
+ /* redirect from/to same file descriptor? */
+ if (right_fd == fd)
+ continue;
+ /* echo >&10 and 10 is a fd opened to the sh script? */
+ if (is_hidden_fd(sv, right_fd)) {
+ errno = EBADF; /* as if it is closed */
+ ash_msg_and_raise_error("%d: %m", right_fd);
+ }
+ newfd = -1;
+ } else {
+ newfd = openredirect(redir); /* always >= 0 */
+ if (fd == newfd) {
+ /* Descriptor wasn't open before redirect.
+ * Mark it for close in the future */
+ if (need_to_remember(sv, fd)) {
+ goto remember_to_close;
+ }
+ continue;
+ }
}
- if (sv && sv->renamed[fd] == EMPTY) {
+#if ENABLE_ASH_BASH_COMPAT
+ redirect_more:
+#endif
+ if (need_to_remember(sv, fd)) {
+ /* Copy old descriptor */
i = fcntl(fd, F_DUPFD, 10);
-
+/* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
+ * are closed in popredir() in the child, preventing them from leaking
+ * into child. (popredir() also cleans up the mess in case of failures)
+ */
if (i == -1) {
i = errno;
if (i != EBADF) {
- close(newfd);
+ /* Strange error (e.g. "too many files" EMFILE?) */
+ if (newfd >= 0)
+ close(newfd);
errno = i;
ash_msg_and_raise_error("%d: %m", fd);
/* NOTREACHED */
}
+ /* EBADF: it is not open - good, remember to close it */
+ remember_to_close:
+ i = CLOSED;
+ } else { /* fd is open, save its copy */
+ /* "exec fd>&-" should not close fds
+ * which point to script file(s).
+ * Force them to be restored afterwards */
+ if (is_hidden_fd(sv, fd))
+ i |= COPYFD_RESTORE;
+ }
+ if (fd == 2)
+ copied_fd2 = i;
+ sv->two_fd[sv_pos].orig = fd;
+ sv->two_fd[sv_pos].copy = i;
+ sv_pos++;
+ }
+ if (newfd < 0) {
+ /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
+ if (redir->ndup.dupfd < 0) { /* "fd>&-" */
+ /* Don't want to trigger debugging */
+ if (fd != -1)
+ close(fd);
} else {
- sv->renamed[fd] = i;
- close(fd);
+ copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
}
- } else {
- close(fd);
+ } else if (fd != newfd) { /* move newfd to fd */
+ copyfd(newfd, fd | COPYFD_EXACT);
+#if ENABLE_ASH_BASH_COMPAT
+ if (!(redir->nfile.type == NTO2 && fd == 2))
+#endif
+ close(newfd);
}
- dupredirect(n, newfd);
- } while ((n = n->nfile.next));
+#if ENABLE_ASH_BASH_COMPAT
+ if (redir->nfile.type == NTO2 && fd == 1) {
+ /* We already redirected it to fd 1, now copy it to 2 */
+ newfd = 1;
+ fd = 2;
+ goto redirect_more;
+ }
+#endif
+ } while ((redir = redir->nfile.next) != NULL);
+
INT_ON;
- if ((flags & REDIR_SAVEFD2) && sv && sv->renamed[2] >= 0)
- preverrout_fd = sv->renamed[2];
+ if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
+ preverrout_fd = copied_fd2;
}
/*
* Undo the effects of the last redirection.
*/
static void
-popredir(int drop)
+popredir(int drop, int restore)
{
struct redirtab *rp;
int i;
return;
INT_OFF;
rp = redirlist;
- for (i = 0; i < 10; i++) {
- if (rp->renamed[i] == CLOSED) {
+ for (i = 0; i < rp->pair_count; i++) {
+ int fd = rp->two_fd[i].orig;
+ int copy = rp->two_fd[i].copy;
+ if (copy == CLOSED) {
if (!drop)
- close(i);
+ close(fd);
continue;
}
- if (rp->renamed[i] != EMPTY) {
- if (!drop) {
- close(i);
- copyfd(rp->renamed[i], i);
+ if (copy != EMPTY) {
+ if (!drop || (restore && (copy & COPYFD_RESTORE))) {
+ copy &= ~COPYFD_RESTORE;
+ /*close(fd);*/
+ copyfd(copy, fd | COPYFD_EXACT);
}
- close(rp->renamed[i]);
+ close(copy & ~COPYFD_RESTORE);
}
}
redirlist = rp->next;
g_nullredirs = 0;
if (!redirlist)
break;
- popredir(drop);
+ popredir(drop, /*restore:*/ 0);
}
}
struct jmploc jmploc;
SAVE_INT(saveint);
- err = setjmp(jmploc.loc) * 2;
+ /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
+ err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
if (!err) {
exception_handler = &jmploc;
redirect(redir, flags);
}
exception_handler = savehandler;
- if (err && exception != EXERROR)
+ if (err && exception_type != EXERROR)
longjmp(exception_handler->loc, 1);
RESTORE_INT(saveint);
return err;
* We have to deal with backquotes, shell variables, and file metacharacters.
*/
+#if ENABLE_SH_MATH_SUPPORT
+static arith_t
+ash_arith(const char *s)
+{
+ arith_eval_hooks_t math_hooks;
+ arith_t result;
+ int errcode = 0;
+
+ math_hooks.lookupvar = lookupvar;
+ math_hooks.setvar = setvar;
+ math_hooks.endofname = endofname;
+
+ INT_OFF;
+ result = arith(s, &errcode, &math_hooks);
+ if (errcode < 0) {
+ if (errcode == -3)
+ ash_msg_and_raise_error("exponent less than 0");
+ if (errcode == -2)
+ ash_msg_and_raise_error("divide by zero");
+ if (errcode == -5)
+ ash_msg_and_raise_error("expression recursion loop detected");
+ raise_error_syntax(s);
+ }
+ INT_ON;
+
+ return result;
+}
+#endif
+
/*
* expandarg flags
*/
int len;
expdest = makestrspace(32, expdest);
-#if ENABLE_ASH_MATH_SUPPORT_64
- len = fmtstr(expdest, 32, "%lld", (long long) num);
-#else
- len = fmtstr(expdest, 32, "%ld", num);
-#endif
+ len = fmtstr(expdest, 32, arith_t_fmt, num);
STADJUST(len, expdest);
return len;
}
}
q = r;
if (len > 0) {
- q = memcpy(q, str, len) + len;
+ q = (char *)memcpy(q, str, len) + len;
}
}
inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
*/
struct backcmd { /* result of evalbackcmd */
int fd; /* file descriptor to read from */
- char *buf; /* buffer */
int nleft; /* number of chars in buffer */
+ char *buf; /* buffer */
struct job *jp; /* job structure for command */
};
/* These forward decls are needed to use "eval" code for backticks handling: */
-static int back_exitstatus; /* exit status of backquoted command */
+static uint8_t back_exitstatus; /* exit status of backquoted command */
#define EV_EXIT 01 /* exit after evaluating tree */
static void evaltree(union node *, int);
result->buf = NULL;
result->nleft = 0;
result->jp = NULL;
- if (n == NULL) {
+ if (n == NULL)
goto out;
- }
saveherefd = herefd;
herefd = -1;
if (pipe(pip) < 0)
ash_msg_and_raise_error("pipe call failed");
- jp = makejob(n, 1);
+ jp = makejob(/*n,*/ 1);
if (forkshell(jp, n, FORK_NOJOB) == 0) {
FORCE_INT_ON;
close(pip[0]);
if (pip[1] != 1) {
- close(1);
- copyfd(pip[1], 1);
+ /*close(1);*/
+ copyfd(pip[1], 1 | COPYFD_EXACT);
close(pip[1]);
}
eflag = 0;
char *p;
char *dest;
int startloc;
- int syntax = quoted? DQSYNTAX : BASESYNTAX;
+ int syntax = quoted ? DQSYNTAX : BASESYNTAX;
struct stackmark smark;
INT_OFF;
stackblock() + startloc));
}
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
/*
* Expand arithmetic expression. Backup to start of expression,
* evaluate, place result in (backed up) result, adjust string position.
int flag;
int len;
- /* ifsfree(); */
+ /* ifsfree(); */
/*
* This routine is slightly over-complicated for
if (quotes)
rmescapes(p + 2);
- len = cvtnum(dash_arith(p + 2));
+ len = cvtnum(ash_arith(p + 2));
if (flag != '"')
recordregion(begoff, begoff + len, 0);
CTLVAR,
CTLBACKQ,
CTLBACKQ | CTLQUOTE,
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
CTLENDARI,
#endif
0
length += strcspn(p + length, reject);
c = p[length];
if (c && (!(c & 0x80)
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
|| c == CTLENDARI
#endif
)) {
expbackq(argbackq->n, c, quotes);
argbackq = argbackq->next;
goto start;
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
case CTLENDARI:
p--;
expari(quotes);
}
static char *
-scanleft(char *startp, char *rmesc, char *rmescend, char *str, int quotes,
+scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM, char *str, int quotes,
int zero)
{
- char *loc;
- char *loc2;
+// This commented out code was added by James Simmons <jsimmons@infradead.org>
+// as part of a larger change when he added support for ${var/a/b}.
+// However, it broke # and % operators:
+//
+//var=ababcdcd
+// ok bad
+//echo ${var#ab} abcdcd abcdcd
+//echo ${var##ab} abcdcd abcdcd
+//echo ${var#a*b} abcdcd ababcdcd (!)
+//echo ${var##a*b} cdcd cdcd
+//echo ${var#?} babcdcd ababcdcd (!)
+//echo ${var##?} babcdcd babcdcd
+//echo ${var#*} ababcdcd babcdcd (!)
+//echo ${var##*}
+//echo ${var%cd} ababcd ababcd
+//echo ${var%%cd} ababcd abab (!)
+//echo ${var%c*d} ababcd ababcd
+//echo ${var%%c*d} abab ababcdcd (!)
+//echo ${var%?} ababcdc ababcdc
+//echo ${var%%?} ababcdc ababcdcd (!)
+//echo ${var%*} ababcdcd ababcdcd
+//echo ${var%%*}
+//
+// Commenting it back out helped. Remove it completely if it really
+// is not needed.
+
+ char *loc, *loc2; //, *full;
char c;
loc = startp;
loc2 = rmesc;
do {
- int match;
+ int match; // = strlen(str);
const char *s = loc2;
+
c = *loc2;
if (zero) {
*loc2 = '\0';
s = rmesc;
}
- match = pmatch(str, s);
+ match = pmatch(str, s); // this line was deleted
+
+// // chop off end if its '*'
+// full = strrchr(str, '*');
+// if (full && full != str)
+// match--;
+//
+// // If str starts with '*' replace with s.
+// if ((*str == '*') && strlen(s) >= match) {
+// full = xstrdup(s);
+// strncpy(full+strlen(s)-match+1, str+1, match-1);
+// } else
+// full = xstrndup(str, match);
+// match = strncmp(s, full, strlen(full));
+// free(full);
+//
*loc2 = c;
- if (match)
+ if (match) // if (!match)
return loc;
if (quotes && *loc == CTLESC)
loc++;
return 0;
}
-static void varunset(const char *, const char *, const char *, int) ATTRIBUTE_NORETURN;
+static void varunset(const char *, const char *, const char *, int) NORETURN;
static void
varunset(const char *end, const char *var, const char *umsg, int varflags)
{
if (*end == CTLENDVAR) {
if (varflags & VSNUL)
tail = " or null";
- } else
+ } else {
msg = umsg;
+ }
}
ash_msg_and_raise_error("%.*s: %s%s", end - var - 1, var, msg, tail);
}
+#if ENABLE_ASH_BASH_COMPAT
+static char *
+parse_sub_pattern(char *arg, int inquotes)
+{
+ char *idx, *repl = NULL;
+ unsigned char c;
+
+ idx = arg;
+ while (1) {
+ c = *arg;
+ if (!c)
+ break;
+ if (c == '/') {
+ /* Only the first '/' seen is our separator */
+ if (!repl) {
+ repl = idx + 1;
+ c = '\0';
+ }
+ }
+ *idx++ = c;
+ if (!inquotes && c == '\\' && arg[1] == '\\')
+ arg++; /* skip both \\, not just first one */
+ arg++;
+ }
+ *idx = c; /* NUL */
+
+ return repl;
+}
+#endif /* ENABLE_ASH_BASH_COMPAT */
+
static const char *
subevalvar(char *p, char *str, int strloc, int subtype,
int startloc, int varflags, int quotes, struct strlist *var_str_list)
{
+ struct nodelist *saveargbackq = argbackq;
char *startp;
char *loc;
- int saveherefd = herefd;
- struct nodelist *saveargbackq = argbackq;
- int amount;
char *rmesc, *rmescend;
+ IF_ASH_BASH_COMPAT(char *repl = NULL;)
+ IF_ASH_BASH_COMPAT(char null = '\0';)
+ IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
+ int saveherefd = herefd;
+ int amount, workloc, resetloc;
int zero;
- char *(*scan)(char *, char *, char *, char *, int , int);
+ char *(*scan)(char*, char*, char*, char*, int, int);
herefd = -1;
argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
STPUTC('\0', expdest);
herefd = saveherefd;
argbackq = saveargbackq;
- startp = stackblock() + startloc;
+ startp = (char *)stackblock() + startloc;
switch (subtype) {
case VSASSIGN:
STADJUST(amount, expdest);
return startp;
+#if ENABLE_ASH_BASH_COMPAT
+ case VSSUBSTR:
+ loc = str = stackblock() + strloc;
+// TODO: number() instead? It does error checking...
+ pos = atoi(loc);
+ len = str - startp - 1;
+
+ /* *loc != '\0', guaranteed by parser */
+ if (quotes) {
+ char *ptr;
+
+ /* We must adjust the length by the number of escapes we find. */
+ for (ptr = startp; ptr < (str - 1); ptr++) {
+ if (*ptr == CTLESC) {
+ len--;
+ ptr++;
+ }
+ }
+ }
+ orig_len = len;
+
+ if (*loc++ == ':') {
+// TODO: number() instead? It does error checking...
+ len = atoi(loc);
+ } else {
+ len = orig_len;
+ while (*loc && *loc != ':')
+ loc++;
+ if (*loc++ == ':')
+// TODO: number() instead? It does error checking...
+ len = atoi(loc);
+ }
+ if (pos >= orig_len) {
+ pos = 0;
+ len = 0;
+ }
+ if (len > (orig_len - pos))
+ len = orig_len - pos;
+
+ for (str = startp; pos; str++, pos--) {
+ if (quotes && *str == CTLESC)
+ str++;
+ }
+ for (loc = startp; len; len--) {
+ if (quotes && *str == CTLESC)
+ *loc++ = *str++;
+ *loc++ = *str++;
+ }
+ *loc = '\0';
+ amount = loc - expdest;
+ STADJUST(amount, expdest);
+ return loc;
+#endif
+
case VSQUESTION:
varunset(p, str, startp, varflags);
/* NOTREACHED */
}
+ resetloc = expdest - (char *)stackblock();
- subtype -= VSTRIMRIGHT;
-#if DEBUG
- if (subtype < 0 || subtype > 3)
- abort();
-#endif
+ /* We'll comeback here if we grow the stack while handling
+ * a VSREPLACE or VSREPLACEALL, since our pointers into the
+ * stack will need rebasing, and we'll need to remove our work
+ * areas each time
+ */
+ IF_ASH_BASH_COMPAT(restart:)
+
+ amount = expdest - ((char *)stackblock() + resetloc);
+ STADJUST(-amount, expdest);
+ startp = (char *)stackblock() + startloc;
rmesc = startp;
- rmescend = stackblock() + strloc;
+ rmescend = (char *)stackblock() + strloc;
if (quotes) {
rmesc = _rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
if (rmesc != startp) {
rmescend = expdest;
- startp = stackblock() + startloc;
+ startp = (char *)stackblock() + startloc;
}
}
rmescend--;
- str = stackblock() + strloc;
+ str = (char *)stackblock() + strloc;
preglob(str, varflags & VSQUOTE, 0);
+ workloc = expdest - (char *)stackblock();
+
+#if ENABLE_ASH_BASH_COMPAT
+ if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
+ char *idx, *end, *restart_detect;
+
+ if (!repl) {
+ repl = parse_sub_pattern(str, varflags & VSQUOTE);
+ if (!repl)
+ repl = &null;
+ }
+
+ /* If there's no pattern to match, return the expansion unmolested */
+ if (*str == '\0')
+ return 0;
+ len = 0;
+ idx = startp;
+ end = str - 1;
+ while (idx < end) {
+ loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
+ if (!loc) {
+ /* No match, advance */
+ restart_detect = stackblock();
+ STPUTC(*idx, expdest);
+ if (quotes && *idx == CTLESC) {
+ idx++;
+ len++;
+ STPUTC(*idx, expdest);
+ }
+ if (stackblock() != restart_detect)
+ goto restart;
+ idx++;
+ len++;
+ rmesc++;
+ continue;
+ }
+
+ if (subtype == VSREPLACEALL) {
+ while (idx < loc) {
+ if (quotes && *idx == CTLESC)
+ idx++;
+ idx++;
+ rmesc++;
+ }
+ } else {
+ idx = loc;
+ }
+
+ for (loc = repl; *loc; loc++) {
+ restart_detect = stackblock();
+ STPUTC(*loc, expdest);
+ if (stackblock() != restart_detect)
+ goto restart;
+ len++;
+ }
+
+ if (subtype == VSREPLACE) {
+ while (*idx) {
+ restart_detect = stackblock();
+ STPUTC(*idx, expdest);
+ if (stackblock() != restart_detect)
+ goto restart;
+ len++;
+ idx++;
+ }
+ break;
+ }
+ }
+
+ /* We've put the replaced text into a buffer at workloc, now
+ * move it to the right place and adjust the stack.
+ */
+ startp = stackblock() + startloc;
+ STPUTC('\0', expdest);
+ memmove(startp, stackblock() + workloc, len);
+ startp[len++] = '\0';
+ amount = expdest - ((char *)stackblock() + startloc + len - 1);
+ STADJUST(-amount, expdest);
+ return startp;
+ }
+#endif /* ENABLE_ASH_BASH_COMPAT */
+
+ subtype -= VSTRIMRIGHT;
+#if DEBUG
+ if (subtype < 0 || subtype > 7)
+ abort();
+#endif
/* zero = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX */
zero = subtype >> 1;
/* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
{
int num;
- char *p;
+ const char *p;
int i;
int sep = 0;
int sepq = 0;
len = cvtnum(num);
break;
case '-':
- p = makestrspace(NOPTS, expdest);
+ expdest = makestrspace(NOPTS, expdest);
for (i = NOPTS - 1; i >= 0; i--) {
if (optlist[i]) {
- USTPUTC(optletters(i), p);
+ USTPUTC(optletters(i), expdest);
len++;
}
}
- expdest = p;
break;
case '@':
if (sep)
case '7':
case '8':
case '9':
+// TODO: number() instead? It does error checking...
num = atoi(name);
if (num < 0 || num > shellparam.nparam)
return -1;
if (!eq) /* stop at first non-assignment */
break;
eq++;
- if (name_len == (eq - str)
+ if (name_len == (unsigned)(eq - str)
&& strncmp(str, name, name_len) == 0) {
p = eq;
/* goto value; - WRONG! */
case VSTRIMLEFTMAX:
case VSTRIMRIGHT:
case VSTRIMRIGHTMAX:
+#if ENABLE_ASH_BASH_COMPAT
+ case VSSUBSTR:
+ case VSREPLACE:
+ case VSREPLACEALL:
+#endif
break;
default:
abort();
q = p;
if (*p == CTLESC)
p++;
- if (strchr(ifs, *p) == NULL ) {
+ if (strchr(ifs, *p) == NULL) {
p = q;
break;
}
if (*p == '.')
matchdot++;
while (!intpending && (dp = readdir(dirp)) != NULL) {
- if (dp->d_name[0] == '.' && ! matchdot)
+ if (dp->d_name[0] == '.' && !matchdot)
continue;
if (pmatch(start, dp->d_name)) {
if (atend) {
}
}
closedir(dirp);
- if (! atend)
+ if (!atend)
endname[-1] = '/';
}
return list;
half = len >> 1;
p = list;
- for (n = half; --n >= 0; ) {
+ for (n = half; --n >= 0;) {
q = p;
p = p->next;
}
}
static void
-expandmeta(struct strlist *str, int flag)
+expandmeta(struct strlist *str /*, int flag*/)
{
static const char metachars[] ALIGN1 = {
'*', '?', '[', 0
ifsbreakup(p, &exparg);
*exparg.lastp = NULL;
exparg.lastp = &exparg.list;
- expandmeta(exparg.list, flag);
+ expandmeta(exparg.list /*, flag*/);
} else {
if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
rmescapes(p);
#define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
struct cmdentry {
- int cmdtype;
+ smallint cmdtype; /* CMDxxx */
union param {
int index;
+ /* index >= 0 for commands without path (slashes) */
+ /* (TODO: what exactly does the value mean? PATH position?) */
+ /* index == -1 for commands with slashes */
+ /* index == (-2 - applet_no) for NOFORK applets */
const struct builtincmd *cmd;
struct funcnode *func;
} u;
* would make the command name "hash" a misnomer.
*/
-#define ARB 1 /* actual size determined at run time */
-
struct tblentry {
struct tblentry *next; /* next entry in hash chain */
union param param; /* definition of builtin function */
- short cmdtype; /* index identifying command */
+ smallint cmdtype; /* CMDxxx */
char rehash; /* if set, cd done since entry created */
- char cmdname[ARB]; /* name of command */
+ char cmdname[1]; /* name of command */
};
static struct tblentry **cmdtable;
static void
-tryexec(char *cmd, char **argv, char **envp)
+tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
{
int repeated = 0;
#if ENABLE_FEATURE_SH_STANDALONE
- if (strchr(cmd, '/') == NULL) {
- int a = find_applet_by_name(cmd);
- if (a >= 0) {
- if (APPLET_IS_NOEXEC(a))
- run_applet_no_and_exit(a, argv);
- /* re-exec ourselves with the new arguments */
- execve(bb_busybox_exec_path, argv, envp);
- /* If they called chroot or otherwise made the binary no longer
- * executable, fall through */
+ if (applet_no >= 0) {
+ if (APPLET_IS_NOEXEC(applet_no)) {
+ while (*envp)
+ putenv(*envp++);
+ run_applet_no_and_exit(applet_no, argv);
}
+ /* re-exec ourselves with the new arguments */
+ execve(bb_busybox_exec_path, argv, envp);
+ /* If they called chroot or otherwise made the binary no longer
+ * executable, fall through */
}
#endif
#else
execve(cmd, argv, envp);
#endif
- if (repeated++) {
+ if (repeated) {
free(argv);
- } else if (errno == ENOEXEC) {
+ return;
+ }
+ if (errno == ENOEXEC) {
char **ap;
char **new;
for (ap = argv; *ap; ap++)
- ;
- ap = new = ckmalloc((ap - argv + 2) * sizeof(char *));
+ continue;
+ ap = new = ckmalloc((ap - argv + 2) * sizeof(ap[0]));
ap[1] = cmd;
ap[0] = cmd = (char *)DEFAULT_SHELL;
ap += 2;
argv++;
- while ((*ap++ = *argv++))
+ while ((*ap++ = *argv++) != NULL)
continue;
argv = new;
+ repeated++;
goto repeat;
}
}
* Exec a program. Never returns. If you change this routine, you may
* have to change the find_command routine as well.
*/
-#define environment() listvars(VEXPORT, VUNSET, 0)
-static void shellexec(char **, const char *, int) ATTRIBUTE_NORETURN;
+static void shellexec(char **, const char *, int) NORETURN;
static void
shellexec(char **argv, const char *path, int idx)
{
int e;
char **envp;
int exerrno;
+#if ENABLE_FEATURE_SH_STANDALONE
+ int applet_no = -1;
+#endif
- clearredir(1);
- envp = environment();
- if (strchr(argv[0], '/')
+ clearredir(/*drop:*/ 1);
+ envp = listvars(VEXPORT, VUNSET, 0);
+ if (strchr(argv[0], '/') != NULL
#if ENABLE_FEATURE_SH_STANDALONE
- || find_applet_by_name(argv[0]) >= 0
+ || (applet_no = find_applet_by_name(argv[0])) >= 0
#endif
) {
- tryexec(argv[0], argv, envp);
+ tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
e = errno;
} else {
e = ENOENT;
while ((cmdname = padvance(&path, argv[0])) != NULL) {
if (--idx < 0 && pathopt == NULL) {
- tryexec(cmdname, argv, envp);
+ tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
if (errno != ENOENT && errno != ENOTDIR)
e = errno;
}
}
exitstatus = exerrno;
TRACE(("shellexec failed for %s, errno %d, suppressint %d\n",
- argv[0], e, suppressint ));
+ argv[0], e, suppressint));
ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
/* NOTREACHED */
}
pp = &cmdp->next;
}
if (add && cmdp == NULL) {
- cmdp = *pp = ckzalloc(sizeof(struct tblentry) - ARB
- + strlen(name) + 1);
+ cmdp = *pp = ckzalloc(sizeof(struct tblentry)
+ + strlen(name)
+ /* + 1 - already done because
+ * tblentry::cmdname is char[1] */);
/*cmdp->next = NULL; - ckzalloc did it */
cmdp->cmdtype = CMDUNKNOWN;
strcpy(cmdp->cmdname, name);
}
static int
-hashcmd(int argc, char **argv)
+hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
struct tblentry **pp;
struct tblentry *cmdp;
#define TWHILE 26
#define TBEGIN 27
#define TEND 28
+typedef smallint token_id_t;
/* first char is indicating which tokens mark the end of a list */
static const char *const tokname_array[] = {
case CMDNORMAL: {
int j = entry.u.index;
char *p;
- if (j == -1) {
+ if (j < 0) {
p = command;
} else {
do {
}
static int
-typecmd(int argc, char **argv)
+typecmd(int argc UNUSED_PARAM, char **argv)
{
int i = 1;
int err = 0;
i++;
verbose = 0;
}
- while (i < argc) {
+ while (argv[i]) {
err |= describe_command(argv[i++], verbose);
}
return err;
#if ENABLE_ASH_CMDCMD
static int
-commandcmd(int argc, char **argv)
+commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
int c;
enum {
else if (c != 'p')
abort();
#endif
- if (verify)
+ /* Mimic bash: just "command -v" doesn't complain, it's a nop */
+ if (verify && (*argptr != NULL)) {
return describe_command(*argptr, verify - VERIFY_BRIEF);
+ }
return 0;
}
/* ============ eval.c */
-static int funcblocksize; /* size of structures in function */
-static int funcstringsize; /* size of strings in node */
-static void *funcblock; /* block to allocate function from */
-static char *funcstring; /* block to allocate strings from */
+static int funcblocksize; /* size of structures in function */
+static int funcstringsize; /* size of strings in node */
+static void *funcblock; /* block to allocate function from */
+static char *funcstring; /* block to allocate strings from */
/* flags in argument to evaltree */
-#define EV_EXIT 01 /* exit after evaluating tree */
-#define EV_TESTED 02 /* exit status is checked; ignore -e flag */
+#define EV_EXIT 01 /* exit after evaluating tree */
+#define EV_TESTED 02 /* exit status is checked; ignore -e flag */
#define EV_BACKCMD 04 /* command executing within back quotes */
-static const short nodesize[26] = {
- SHELL_ALIGN(sizeof(struct ncmd)),
- SHELL_ALIGN(sizeof(struct npipe)),
- SHELL_ALIGN(sizeof(struct nredir)),
- SHELL_ALIGN(sizeof(struct nredir)),
- SHELL_ALIGN(sizeof(struct nredir)),
- SHELL_ALIGN(sizeof(struct nbinary)),
- SHELL_ALIGN(sizeof(struct nbinary)),
- SHELL_ALIGN(sizeof(struct nbinary)),
- SHELL_ALIGN(sizeof(struct nif)),
- SHELL_ALIGN(sizeof(struct nbinary)),
- SHELL_ALIGN(sizeof(struct nbinary)),
- SHELL_ALIGN(sizeof(struct nfor)),
- SHELL_ALIGN(sizeof(struct ncase)),
- SHELL_ALIGN(sizeof(struct nclist)),
- SHELL_ALIGN(sizeof(struct narg)),
- SHELL_ALIGN(sizeof(struct narg)),
- SHELL_ALIGN(sizeof(struct nfile)),
- SHELL_ALIGN(sizeof(struct nfile)),
- SHELL_ALIGN(sizeof(struct nfile)),
- SHELL_ALIGN(sizeof(struct nfile)),
- SHELL_ALIGN(sizeof(struct nfile)),
- SHELL_ALIGN(sizeof(struct ndup)),
- SHELL_ALIGN(sizeof(struct ndup)),
- SHELL_ALIGN(sizeof(struct nhere)),
- SHELL_ALIGN(sizeof(struct nhere)),
- SHELL_ALIGN(sizeof(struct nnot)),
+static const short nodesize[N_NUMBER] = {
+ [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
+ [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
+ [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
+ [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
+ [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
+ [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
+ [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
+ [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
+ [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
+ [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
+ [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
+ [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
+ [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
+ [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
+ [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
+ [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
+ [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
+#if ENABLE_ASH_BASH_COMPAT
+ [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
+#endif
+ [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
+ [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
+ [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
+ [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
+ [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
+ [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
+ [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
+ [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
+ [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
};
static void calcsize(union node *n);
calcsize(n->narg.next);
break;
case NTO:
+#if ENABLE_ASH_BASH_COMPAT
+ case NTO2:
+#endif
case NCLOBBER:
case NFROM:
case NFROMTO:
break;
case NPIPE:
new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
- new->npipe.backgnd = n->npipe.backgnd;
+ new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
break;
case NREDIR:
case NBACKGND:
new->narg.next = copynode(n->narg.next);
break;
case NTO:
+#if ENABLE_ASH_BASH_COMPAT
+ case NTO2:
+#endif
case NCLOBBER:
case NFROM:
case NFROMTO:
INT_ON;
}
-static int evalskip; /* set if we are skipping commands */
-/* reasons for skipping commands (see comment on breakcmd routine) */
+/* Reasons for skipping commands (see comment on breakcmd routine) */
#define SKIPBREAK (1 << 0)
#define SKIPCONT (1 << 1)
#define SKIPFUNC (1 << 2)
#define SKIPFILE (1 << 3)
#define SKIPEVAL (1 << 4)
+static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
static int skipcount; /* number of levels to skip */
static int funcnest; /* depth of function calls */
+static int loopnest; /* current loop nesting level */
-/* forward decl way out to parsing code - dotrap needs it */
+/* Forward decl way out to parsing code - dotrap needs it */
static int evalstring(char *s, int mask);
-/*
- * Called to execute a trap. Perhaps we should avoid entering new trap
- * handlers while we are executing a trap handler.
+/* Called to execute a trap.
+ * Single callsite - at the end of evaltree().
+ * If we return non-zero, exaltree raises EXEXIT exception.
+ *
+ * Perhaps we should avoid entering new trap handlers
+ * while we are executing a trap handler. [is it a TODO?]
*/
static int
dotrap(void)
{
- char *p;
- char *q;
- int i;
- int savestatus;
- int skip;
+ uint8_t *g;
+ int sig;
+ uint8_t savestatus;
savestatus = exitstatus;
pendingsig = 0;
xbarrier();
- for (i = 0, q = gotsig; i < NSIG - 1; i++, q++) {
- if (!*q)
+ TRACE(("dotrap entered\n"));
+ for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
+ int want_exexit;
+ char *t;
+
+ if (*g == 0)
+ continue;
+ t = trap[sig];
+ /* non-trapped SIGINT is handled separately by raise_interrupt,
+ * don't upset it by resetting gotsig[SIGINT-1] */
+ if (sig == SIGINT && !t)
continue;
- *q = '\0';
- p = trap[i + 1];
- if (!p)
+ TRACE(("sig %d is active, will run handler '%s'\n", sig, t));
+ *g = 0;
+ if (!t)
continue;
- skip = evalstring(p, SKIPEVAL);
+ want_exexit = evalstring(t, SKIPEVAL);
exitstatus = savestatus;
- if (skip)
- return skip;
+ if (want_exexit) {
+ TRACE(("dotrap returns %d\n", want_exexit));
+ return want_exexit;
+ }
}
+ TRACE(("dotrap returns 0\n"));
return 0;
}
static void
evaltree(union node *n, int flags)
{
+ struct jmploc *volatile savehandler = exception_handler;
+ struct jmploc jmploc;
int checkexit = 0;
void (*evalfn)(union node *, int);
- unsigned isor;
int status;
+ int int_level;
+
+ SAVE_INT(int_level);
+
if (n == NULL) {
TRACE(("evaltree(NULL) called\n"));
- goto out;
+ goto out1;
+ }
+ TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
+
+ exception_handler = &jmploc;
+ {
+ int err = setjmp(jmploc.loc);
+ if (err) {
+ /* if it was a signal, check for trap handlers */
+ if (exception_type == EXSIG) {
+ TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
+ exception_type, err));
+ goto out;
+ }
+ /* continue on the way out */
+ TRACE(("exception %d in evaltree, propagating err=%d\n",
+ exception_type, err));
+ exception_handler = savehandler;
+ longjmp(exception_handler->loc, err);
+ }
}
- TRACE(("pid %d, evaltree(%p: %d, %d) called\n",
- getpid(), n, n->type, flags));
+
switch (n->type) {
default:
#if DEBUG
evaltree(n->nredir.n, flags & EV_TESTED);
status = exitstatus;
}
- popredir(0);
+ popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
goto setstatus;
case NCMD:
evalfn = evalcommand;
goto calleval;
case NAND:
case NOR:
- case NSEMI:
+ case NSEMI: {
+
#if NAND + 1 != NOR
#error NAND + 1 != NOR
#endif
#if NOR + 1 != NSEMI
#error NOR + 1 != NSEMI
#endif
- isor = n->type - NAND;
+ unsigned is_or = n->type - NAND;
evaltree(
n->nbinary.ch1,
- (flags | ((isor >> 1) - 1)) & EV_TESTED
+ (flags | ((is_or >> 1) - 1)) & EV_TESTED
);
- if (!exitstatus == isor)
+ if (!exitstatus == is_or)
break;
if (!evalskip) {
n = n->nbinary.ch2;
break;
}
break;
+ }
case NIF:
evaltree(n->nif.test, EV_TESTED);
if (evalskip)
if (exitstatus == 0) {
n = n->nif.ifpart;
goto evaln;
- } else if (n->nif.elsepart) {
+ }
+ if (n->nif.elsepart) {
n = n->nif.elsepart;
goto evaln;
}
exitstatus = status;
break;
}
+
out:
- if ((checkexit & exitstatus))
+ exception_handler = savehandler;
+ out1:
+ if (checkexit & exitstatus)
evalskip |= SKIPEVAL;
else if (pendingsig && dotrap())
goto exexit;
exexit:
raise_exception(EXEXIT);
}
+
+ RESTORE_INT(int_level);
+ TRACE(("leaving evaltree (no interrupts)\n"));
}
#if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
#endif
void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
-static int loopnest; /* current loop nesting level */
-
static void
evalloop(union node *n, int flags)
{
if (!backgnd && flags & EV_EXIT && !trap[0])
goto nofork;
INT_OFF;
- jp = makejob(n, 1);
+ jp = makejob(/*n,*/ 1);
if (forkshell(jp, n, backgnd) == 0) {
INT_ON;
flags |= EV_EXIT;
/* never returns */
}
status = 0;
- if (! backgnd)
+ if (!backgnd)
status = waitforjob(jp);
exitstatus = status;
INT_ON;
case NFROMTO:
case NFROM:
case NTO:
+#if ENABLE_ASH_BASH_COMPAT
+ case NTO2:
+#endif
case NCLOBBER:
case NAPPEND:
expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
+#if ENABLE_ASH_BASH_COMPAT
+ store_expfname:
+#endif
redir->nfile.expfname = fn.list->text;
break;
case NFROMFD:
- case NTOFD:
+ case NTOFD: /* >& */
if (redir->ndup.vname) {
expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
if (fn.list == NULL)
ash_msg_and_raise_error("redir error");
+#if ENABLE_ASH_BASH_COMPAT
+//FIXME: we used expandarg with different args!
+ if (!isdigit_str9(fn.list->text)) {
+ /* >&file, not >&fd */
+ if (redir->nfile.fd != 1) /* 123>&file - BAD */
+ ash_msg_and_raise_error("redir error");
+ redir->type = NTO2;
+ goto store_expfname;
+ }
+#endif
fixredir(redir, fn.list->text, 1);
}
break;
pipelen++;
flags |= EV_EXIT;
INT_OFF;
- jp = makejob(n, pipelen);
+ jp = makejob(/*n,*/ pipelen);
prevfd = -1;
for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
prehash(lp->n);
ash_msg_and_raise_error("pipe call failed");
}
}
- if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) {
+ if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
INT_ON;
if (pip[1] >= 0) {
close(pip[0]);
if (prevfd >= 0)
close(prevfd);
prevfd = pip[0];
- close(pip[1]);
+ /* Don't want to trigger debugging */
+ if (pip[1] != -1)
+ close(pip[1]);
}
- if (n->npipe.backgnd == 0) {
+ if (n->npipe.pipe_backgnd == 0) {
exitstatus = waitforjob(jp);
TRACE(("evalpipe: job done exit status %d\n", exitstatus));
}
static void
setinteractive(int on)
{
- static int is_interactive;
+ static smallint is_interactive;
if (++on == is_interactive)
return;
#endif
}
-#if ENABLE_FEATURE_EDITING_VI
-#define setvimode(on) do { \
- if (on) line_input_state->flags |= VI_MODE; \
- else line_input_state->flags &= ~VI_MODE; \
-} while (0)
-#else
-#define setvimode(on) viflag = 0 /* forcibly keep the option off */
-#endif
-
static void
optschanged(void)
{
#endif
setinteractive(iflag);
setjobctl(mflag);
- setvimode(viflag);
+#if ENABLE_FEATURE_EDITING_VI
+ if (viflag)
+ line_input_state->flags |= VI_MODE;
+ else
+ line_input_state->flags &= ~VI_MODE;
+#else
+ viflag = 0; /* forcibly keep the option off */
+#endif
}
static struct localvar *localvars;
* The "local" command.
*/
static int
-localcmd(int argc, char **argv)
+localcmd(int argc UNUSED_PARAM, char **argv)
{
char *name;
}
static int
-falsecmd(int argc, char **argv)
+falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
return 1;
}
static int
-truecmd(int argc, char **argv)
+truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
return 0;
}
static int
-execcmd(int argc, char **argv)
+execcmd(int argc UNUSED_PARAM, char **argv)
{
- if (argc > 1) {
+ if (argv[1]) {
iflag = 0; /* exit on error */
mflag = 0;
optschanged();
* The return command.
*/
static int
-returncmd(int argc, char **argv)
+returncmd(int argc UNUSED_PARAM, char **argv)
{
/*
* If called outside a function, do what ksh does;
static int breakcmd(int, char **);
static int dotcmd(int, char **);
static int evalcmd(int, char **);
-#if ENABLE_ASH_BUILTIN_ECHO
-static int echocmd(int, char **);
-#endif
-#if ENABLE_ASH_BUILTIN_TEST
-static int testcmd(int, char **);
-#endif
static int exitcmd(int, char **);
static int exportcmd(int, char **);
#if ENABLE_ASH_GETOPTS
static int getoptscmd(int, char **);
#endif
#if !ENABLE_FEATURE_SH_EXTRA_QUIET
-static int helpcmd(int argc, char **argv);
+static int helpcmd(int, char **);
#endif
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
static int letcmd(int, char **);
#endif
static int readcmd(int, char **);
#define BUILTIN_REG_ASSG "6"
#define BUILTIN_SPEC_REG_ASSG "7"
-/* make sure to keep these in proper order since it is searched via bsearch() */
+/* We do not handle [[ expr ]] bashism bash-compatibly,
+ * we make it a synonym of [ expr ].
+ * Basically, word splitting and pathname expansion should NOT be performed
+ * Examples:
+ * no word splitting: a="a b"; [[ $a = "a b" ]]; echo $? should print "0"
+ * no pathname expansion: [[ /bin/m* = "/bin/m*" ]]; echo $? should print "0"
+ * Additional operators:
+ * || and && should work as -o and -a
+ * =~ regexp match
+ * Apart from the above, [[ expr ]] should work as [ expr ]
+ */
+
+#define echocmd echo_main
+#define printfcmd printf_main
+#define testcmd test_main
+
+/* Keep these in proper order since it is searched via bsearch() */
static const struct builtincmd builtintab[] = {
{ BUILTIN_SPEC_REG ".", dotcmd },
{ BUILTIN_SPEC_REG ":", truecmd },
#if ENABLE_ASH_BUILTIN_TEST
- { BUILTIN_REGULAR "[", testcmd },
- { BUILTIN_REGULAR "[[", testcmd },
+ { BUILTIN_REGULAR "[", testcmd },
+#if ENABLE_ASH_BASH_COMPAT
+ { BUILTIN_REGULAR "[[", testcmd },
+#endif
#endif
#if ENABLE_ASH_ALIAS
{ BUILTIN_REG_ASSG "alias", aliascmd },
{ BUILTIN_REGULAR "jobs", jobscmd },
{ BUILTIN_REGULAR "kill", killcmd },
#endif
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
{ BUILTIN_NOSPEC "let", letcmd },
#endif
{ BUILTIN_ASSIGN "local", localcmd },
+#if ENABLE_ASH_BUILTIN_PRINTF
+ { BUILTIN_REGULAR "printf", printfcmd },
+#endif
{ BUILTIN_NOSPEC "pwd", pwdcmd },
{ BUILTIN_REGULAR "read", readcmd },
{ BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
{ BUILTIN_SPEC_REG "shift", shiftcmd },
{ BUILTIN_SPEC_REG "source", dotcmd },
#if ENABLE_ASH_BUILTIN_TEST
- { BUILTIN_REGULAR "test", testcmd },
+ { BUILTIN_REGULAR "test", testcmd },
#endif
{ BUILTIN_SPEC_REG "times", timescmd },
{ BUILTIN_SPEC_REG "trap", trapcmd },
{ BUILTIN_REGULAR "wait", waitcmd },
};
-
-#define COMMANDCMD (builtintab + 5 + \
- 2 * ENABLE_ASH_BUILTIN_TEST + \
- ENABLE_ASH_ALIAS + \
- ENABLE_ASH_JOB_CONTROL)
-#define EXECCMD (builtintab + 7 + \
- 2 * ENABLE_ASH_BUILTIN_TEST + \
- ENABLE_ASH_ALIAS + \
- ENABLE_ASH_JOB_CONTROL + \
- ENABLE_ASH_CMDCMD + \
- ENABLE_ASH_BUILTIN_ECHO)
+/* Should match the above table! */
+#define COMMANDCMD (builtintab + \
+ 2 + \
+ 1 * ENABLE_ASH_BUILTIN_TEST + \
+ 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
+ 1 * ENABLE_ASH_ALIAS + \
+ 1 * ENABLE_ASH_JOB_CONTROL + \
+ 3)
+#define EXECCMD (builtintab + \
+ 2 + \
+ 1 * ENABLE_ASH_BUILTIN_TEST + \
+ 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
+ 1 * ENABLE_ASH_ALIAS + \
+ 1 * ENABLE_ASH_JOB_CONTROL + \
+ 3 + \
+ 1 * ENABLE_ASH_CMDCMD + \
+ 1 + \
+ ENABLE_ASH_BUILTIN_ECHO + \
+ 1)
/*
* Search the table of builtin commands.
/*
* Execute a simple command.
*/
-static int back_exitstatus; /* exit status of backquoted command */
static int
isassignment(const char *p)
{
return *q == '=';
}
static int
-bltincmd(int argc, char **argv)
+bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
/* Preserve exitstatus of a previous possible redirection
* as POSIX mandates */
char *lastarg;
const char *path;
int spclbltin;
- int cmd_is_exec;
int status;
char **nargv;
struct builtincmd *bcmd;
- int pseudovarflag = 0;
+ smallint cmd_is_exec;
+ smallint pseudovarflag = 0;
/* First expand the arguments. */
TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
for (;;) {
find_command(argv[0], &cmdentry, cmd_flag, path);
if (cmdentry.cmdtype == CMDUNKNOWN) {
- status = 127;
flush_stderr();
+ status = 127;
goto bail;
}
if (spclbltin < 0)
spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
if (cmdentry.u.cmd == EXECCMD)
- cmd_is_exec++;
+ cmd_is_exec = 1;
#if ENABLE_ASH_CMDCMD
if (cmdentry.u.cmd == COMMANDCMD) {
path = oldpath;
/* Execute the command. */
switch (cmdentry.cmdtype) {
default:
+
+#if ENABLE_FEATURE_SH_NOFORK
+/* Hmmm... shouldn't it happen somewhere in forkshell() instead?
+ * Why "fork off a child process if necessary" doesn't apply to NOFORK? */
+ {
+ /* find_command() encodes applet_no as (-2 - applet_no) */
+ int applet_no = (- cmdentry.u.index - 2);
+ if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
+ listsetvar(varlist.list, VEXPORT|VSTACK);
+ /* run <applet>_main() */
+ exitstatus = run_nofork_applet(applet_no, argv);
+ break;
+ }
+ }
+#endif
/* Fork off a child process if necessary. */
if (!(flags & EV_EXIT) || trap[0]) {
INT_OFF;
- jp = makejob(cmd, 1);
+ jp = makejob(/*cmd,*/ 1);
if (forkshell(jp, cmd, FORK_FG) != 0) {
exitstatus = waitforjob(jp);
INT_ON;
+ TRACE(("forked child exited with %d\n", exitstatus));
break;
}
FORCE_INT_ON;
}
listsetvar(list, i);
}
+ /* Tight loop with builtins only:
+ * "while kill -0 $child; do true; done"
+ * will never exit even if $child died, unless we do this
+ * to reap the zombie and make kill detect that it's gone: */
+ dowait(DOWAIT_NONBLOCK, NULL);
+
if (evalbltin(cmdentry.u.cmd, argc, argv)) {
int exit_status;
- int i = exception;
+ int i = exception_type;
if (i == EXEXIT)
goto raise;
exit_status = 2;
case CMDFUNCTION:
listsetvar(varlist.list, 0);
+ /* See above for the rationale */
+ dowait(DOWAIT_NONBLOCK, NULL);
if (evalfun(cmdentry.u.func, argc, argv, flags))
goto raise;
break;
}
out:
- popredir(cmd_is_exec);
- if (lastarg)
+ popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
+ if (lastarg) {
/* dsl: I think this is intended to be used to support
* '_' in 'vi' command mode during line editing...
* However I implemented that within libedit itself.
*/
setvar("_", lastarg, 0);
+ }
popstackmark(&smark);
}
* in the standard shell so we don't make it one here.
*/
static int
-breakcmd(int argc, char **argv)
+breakcmd(int argc UNUSED_PARAM, char **argv)
{
- int n = argc > 1 ? number(argv[1]) : 1;
+ int n = argv[1] ? number(argv[1]) : 1;
if (n <= 0)
ash_msg_and_raise_error(illnum, argv[1]);
* This implements the input routines used by the parser.
*/
-#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
-
enum {
INPUT_PUSH_FILE = 1,
INPUT_NOFILE_OK = 2,
};
-static int plinno = 1; /* input line number */
-/* number of characters left in input buffer */
-static int parsenleft; /* copy of parsefile->nleft */
-static int parselleft; /* copy of parsefile->lleft */
-/* next character in input buffer */
-static char *parsenextc; /* copy of parsefile->nextc */
-
-static int checkkwd;
+static smallint checkkwd;
/* values of checkkwd variable */
#define CHKALIAS 0x1
#define CHKKWD 0x2
#define CHKNL 0x4
+/*
+ * Push a string back onto the input at this current parsefile level.
+ * We handle aliases this way.
+ */
+#if !ENABLE_ASH_ALIAS
+#define pushstring(s, ap) pushstring(s)
+#endif
+static void
+pushstring(char *s, struct alias *ap)
+{
+ struct strpush *sp;
+ int len;
+
+ len = strlen(s);
+ INT_OFF;
+ if (g_parsefile->strpush) {
+ sp = ckzalloc(sizeof(*sp));
+ sp->prev = g_parsefile->strpush;
+ } else {
+ sp = &(g_parsefile->basestrpush);
+ }
+ g_parsefile->strpush = sp;
+ sp->prev_string = g_parsefile->next_to_pgetc;
+ sp->prev_left_in_line = g_parsefile->left_in_line;
+#if ENABLE_ASH_ALIAS
+ sp->ap = ap;
+ if (ap) {
+ ap->flag |= ALIASINUSE;
+ sp->string = s;
+ }
+#endif
+ g_parsefile->next_to_pgetc = s;
+ g_parsefile->left_in_line = len;
+ INT_ON;
+}
+
static void
popstring(void)
{
- struct strpush *sp = parsefile->strpush;
+ struct strpush *sp = g_parsefile->strpush;
INT_OFF;
#if ENABLE_ASH_ALIAS
if (sp->ap) {
- if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
+ if (g_parsefile->next_to_pgetc[-1] == ' '
+ || g_parsefile->next_to_pgetc[-1] == '\t'
+ ) {
checkkwd |= CHKALIAS;
}
if (sp->string != sp->ap->val) {
}
}
#endif
- parsenextc = sp->prevstring;
- parsenleft = sp->prevnleft;
-/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
- parsefile->strpush = sp->prev;
- if (sp != &(parsefile->basestrpush))
+ g_parsefile->next_to_pgetc = sp->prev_string;
+ g_parsefile->left_in_line = sp->prev_left_in_line;
+ g_parsefile->strpush = sp->prev;
+ if (sp != &(g_parsefile->basestrpush))
free(sp);
INT_ON;
}
+//FIXME: BASH_COMPAT with "...&" does TWO pungetc():
+//it peeks whether it is &>, and then pushes back both chars.
+//This function needs to save last *next_to_pgetc to buf[0]
+//to make two pungetc() reliable. Currently,
+// pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work...
static int
preadfd(void)
{
int nr;
- char *buf = parsefile->buf;
- parsenextc = buf;
+ char *buf = g_parsefile->buf;
- retry:
+ g_parsefile->next_to_pgetc = buf;
#if ENABLE_FEATURE_EDITING
- if (!iflag || parsefile->fd)
- nr = nonblock_safe_read(parsefile->fd, buf, BUFSIZ - 1);
+ retry:
+ if (!iflag || g_parsefile->fd != STDIN_FILENO)
+ nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
else {
#if ENABLE_FEATURE_TAB_COMPLETION
line_input_state->path_lookup = pathval();
}
}
#else
- nr = nonblock_safe_read(parsefile->fd, buf, BUFSIZ - 1);
+ nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
#endif
#if 0
* Refill the input buffer and return the next input character:
*
* 1) If a string was pushed back on the input, pop it;
- * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
- * from a string so we can't refill the buffer, return EOF.
+ * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
+ * or we are reading from a string so we can't refill the buffer,
+ * return EOF.
* 3) If the is more stuff in this buffer, use it else call read to fill it.
* 4) Process input up to the next newline, deleting nul characters.
*/
+//#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
+#define pgetc_debug(...) ((void)0)
+/*
+ * NB: due to SIT(c) internals (syntax_index_table[] vector),
+ * pgetc() and related functions must return chars SIGN-EXTENDED into ints,
+ * not zero-extended. Seems fragile to me. Affects only !USE_SIT_FUNCTION case,
+ * so we can fix it by ditching !USE_SIT_FUNCTION if Unicode requires that.
+ */
static int
preadbuffer(void)
{
char *q;
int more;
- char savec;
- while (parsefile->strpush) {
+ while (g_parsefile->strpush) {
#if ENABLE_ASH_ALIAS
- if (parsenleft == -1 && parsefile->strpush->ap &&
- parsenextc[-1] != ' ' && parsenextc[-1] != '\t') {
+ if (g_parsefile->left_in_line == -1
+ && g_parsefile->strpush->ap
+ && g_parsefile->next_to_pgetc[-1] != ' '
+ && g_parsefile->next_to_pgetc[-1] != '\t'
+ ) {
+ pgetc_debug("preadbuffer PEOA");
return PEOA;
}
#endif
popstring();
- if (--parsenleft >= 0)
- return signed_char2int(*parsenextc++);
- }
- if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
+ /* try "pgetc" now: */
+ pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'",
+ g_parsefile->left_in_line,
+ g_parsefile->next_to_pgetc,
+ g_parsefile->next_to_pgetc);
+ if (--g_parsefile->left_in_line >= 0)
+ return (unsigned char)(*g_parsefile->next_to_pgetc++);
+ }
+ /* on both branches above g_parsefile->left_in_line < 0.
+ * "pgetc" needs refilling.
+ */
+
+ /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
+ * pungetc() may increment it a few times.
+ * Assuming it won't increment it to less than -90.
+ */
+ if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
+ pgetc_debug("preadbuffer PEOF1");
+ /* even in failure keep left_in_line and next_to_pgetc
+ * in lock step, for correct multi-layer pungetc.
+ * left_in_line was decremented before preadbuffer(),
+ * must inc next_to_pgetc: */
+ g_parsefile->next_to_pgetc++;
return PEOF;
- flush_stdout_stderr();
+ }
- more = parselleft;
+ more = g_parsefile->left_in_buffer;
if (more <= 0) {
+ flush_stdout_stderr();
again:
more = preadfd();
if (more <= 0) {
- parselleft = parsenleft = EOF_NLEFT;
+ /* don't try reading again */
+ g_parsefile->left_in_line = -99;
+ pgetc_debug("preadbuffer PEOF2");
+ g_parsefile->next_to_pgetc++;
return PEOF;
}
}
- q = parsenextc;
-
- /* delete nul characters */
+ /* Find out where's the end of line.
+ * Set g_parsefile->left_in_line
+ * and g_parsefile->left_in_buffer acordingly.
+ * NUL chars are deleted.
+ */
+ q = g_parsefile->next_to_pgetc;
for (;;) {
- int c;
+ char c;
more--;
- c = *q;
- if (!c)
+ c = *q;
+ if (c == '\0') {
memmove(q, q + 1, more);
- else {
+ } else {
q++;
if (c == '\n') {
- parsenleft = q - parsenextc - 1;
+ g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
break;
}
}
if (more <= 0) {
- parsenleft = q - parsenextc - 1;
- if (parsenleft < 0)
+ g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
+ if (g_parsefile->left_in_line < 0)
goto again;
break;
}
}
- parselleft = more;
-
- savec = *q;
- *q = '\0';
+ g_parsefile->left_in_buffer = more;
if (vflag) {
- out2str(parsenextc);
+ char save = *q;
+ *q = '\0';
+ out2str(g_parsefile->next_to_pgetc);
+ *q = save;
}
- *q = savec;
-
- return signed_char2int(*parsenextc++);
+ pgetc_debug("preadbuffer at %d:%p'%s'",
+ g_parsefile->left_in_line,
+ g_parsefile->next_to_pgetc,
+ g_parsefile->next_to_pgetc);
+ return signed_char2int(*g_parsefile->next_to_pgetc++);
}
-#define pgetc_as_macro() (--parsenleft >= 0? signed_char2int(*parsenextc++) : preadbuffer())
+#define pgetc_as_macro() \
+ (--g_parsefile->left_in_line >= 0 \
+ ? signed_char2int(*g_parsefile->next_to_pgetc++) \
+ : preadbuffer() \
+ )
+
static int
pgetc(void)
{
+ pgetc_debug("pgetc_fast at %d:%p'%s'",
+ g_parsefile->left_in_line,
+ g_parsefile->next_to_pgetc,
+ g_parsefile->next_to_pgetc);
return pgetc_as_macro();
}
#if ENABLE_ASH_OPTIMIZE_FOR_SIZE
-#define pgetc_macro() pgetc()
+#define pgetc_fast() pgetc()
#else
-#define pgetc_macro() pgetc_as_macro()
+#define pgetc_fast() pgetc_as_macro()
#endif
/*
pgetc2(void)
{
int c;
-
do {
- c = pgetc_macro();
+ pgetc_debug("pgetc_fast at %d:%p'%s'",
+ g_parsefile->left_in_line,
+ g_parsefile->next_to_pgetc,
+ g_parsefile->next_to_pgetc);
+ c = pgetc_fast();
} while (c == PEOA);
return c;
}
#else
-static int
-pgetc2(void)
-{
- return pgetc_macro();
-}
+#define pgetc2() pgetc()
#endif
/*
static void
pungetc(void)
{
- parsenleft++;
- parsenextc--;
-}
-
-/*
- * Push a string back onto the input at this current parsefile level.
- * We handle aliases this way.
- */
-static void
-pushstring(char *s, void *ap)
-{
- struct strpush *sp;
- size_t len;
-
- len = strlen(s);
- INT_OFF;
-/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
- if (parsefile->strpush) {
- sp = ckzalloc(sizeof(struct strpush));
- sp->prev = parsefile->strpush;
- parsefile->strpush = sp;
- } else
- sp = parsefile->strpush = &(parsefile->basestrpush);
- sp->prevstring = parsenextc;
- sp->prevnleft = parsenleft;
-#if ENABLE_ASH_ALIAS
- sp->ap = (struct alias *)ap;
- if (ap) {
- ((struct alias *)ap)->flag |= ALIASINUSE;
- sp->string = s;
- }
-#endif
- parsenextc = s;
- parsenleft = len;
- INT_ON;
+ g_parsefile->left_in_line++;
+ g_parsefile->next_to_pgetc--;
+ pgetc_debug("pushed back to %d:%p'%s'",
+ g_parsefile->left_in_line,
+ g_parsefile->next_to_pgetc,
+ g_parsefile->next_to_pgetc);
}
/*
{
struct parsefile *pf;
- parsefile->nleft = parsenleft;
- parsefile->lleft = parselleft;
- parsefile->nextc = parsenextc;
- parsefile->linno = plinno;
pf = ckzalloc(sizeof(*pf));
- pf->prev = parsefile;
+ pf->prev = g_parsefile;
pf->fd = -1;
/*pf->strpush = NULL; - ckzalloc did it */
/*pf->basestrpush.prev = NULL;*/
- parsefile = pf;
+ g_parsefile = pf;
}
static void
popfile(void)
{
- struct parsefile *pf = parsefile;
+ struct parsefile *pf = g_parsefile;
INT_OFF;
if (pf->fd >= 0)
free(pf->buf);
while (pf->strpush)
popstring();
- parsefile = pf->prev;
+ g_parsefile = pf->prev;
free(pf);
- parsenleft = parsefile->nleft;
- parselleft = parsefile->lleft;
- parsenextc = parsefile->nextc;
- plinno = parsefile->linno;
INT_ON;
}
static void
popallfiles(void)
{
- while (parsefile != &basepf)
+ while (g_parsefile != &basepf)
popfile();
}
closescript(void)
{
popallfiles();
- if (parsefile->fd > 0) {
- close(parsefile->fd);
- parsefile->fd = 0;
+ if (g_parsefile->fd > 0) {
+ close(g_parsefile->fd);
+ g_parsefile->fd = 0;
}
}
close_on_exec_on(fd);
if (push) {
pushfile();
- parsefile->buf = 0;
+ g_parsefile->buf = NULL;
}
- parsefile->fd = fd;
- if (parsefile->buf == NULL)
- parsefile->buf = ckmalloc(IBUFSIZ);
- parselleft = parsenleft = 0;
- plinno = 1;
+ g_parsefile->fd = fd;
+ if (g_parsefile->buf == NULL)
+ g_parsefile->buf = ckmalloc(IBUFSIZ);
+ g_parsefile->left_in_buffer = 0;
+ g_parsefile->left_in_line = 0;
+ g_parsefile->linno = 1;
}
/*
if (fd < 0) {
if (flags & INPUT_NOFILE_OK)
goto out;
- ash_msg_and_raise_error("can't open %s", fname);
+ ash_msg_and_raise_error("can't open '%s'", fname);
}
if (fd < 10) {
fd2 = copyfd(fd, 10);
{
INT_OFF;
pushfile();
- parsenextc = string;
- parsenleft = strlen(string);
- parsefile->buf = NULL;
- plinno = 1;
+ g_parsefile->next_to_pgetc = string;
+ g_parsefile->left_in_line = strlen(string);
+ g_parsefile->buf = NULL;
+ g_parsefile->linno = 1;
INT_ON;
}
break;
if (*p == '\0')
continue;
- for (q = p; *q; q++);
+ for (q = p; *q; q++)
+ continue;
#if DEBUG
if (q[-1] != '/')
abort();
}
static void
-changemail(const char *val)
+changemail(const char *val UNUSED_PARAM)
{
mail_var_path_changed = 1;
}
char **ap;
int nparam;
- for (nparam = 0; argv[nparam]; nparam++);
+ for (nparam = 0; argv[nparam]; nparam++)
+ continue;
ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
while (*argv) {
*ap++ = ckstrdup(*argv++);
* Oh well. Let's mimic that.
*/
static int
-minus_o(char *name, int val)
+plus_minus_o(char *name, int val)
{
int i;
return 0;
}
}
- ash_msg("illegal option -o %s", name);
+ ash_msg("illegal option %co %s", val ? '-' : '+', name);
return 1;
}
- out1str("Current option settings\n");
- for (i = 0; i < NOPTS; i++)
- out1fmt("%-16s%s\n", optnames(i),
- optlist[i] ? "on" : "off");
+ for (i = 0; i < NOPTS; i++) {
+ if (val) {
+ out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
+ } else {
+ out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
+ }
+ }
return 0;
}
static void
return;
}
}
- ash_msg_and_raise_error("illegal option -%c", flag);
+ ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
/* NOTREACHED */
}
static int
if (c == 'c' && cmdline) {
minusc = p; /* command is after shell args */
} else if (c == 'o') {
- if (minus_o(*argptr, val)) {
+ if (plus_minus_o(*argptr, val)) {
/* it already printed err message */
return 1; /* error */
}
* The shift builtin command.
*/
static int
-shiftcmd(int argc, char **argv)
+shiftcmd(int argc UNUSED_PARAM, char **argv)
{
int n;
char **ap1, **ap2;
n = 1;
- if (argc > 1)
+ if (argv[1])
n = number(argv[1]);
if (n > shellparam.nparam)
- ash_msg_and_raise_error("can't shift that many");
+ n = 0; /* bash compat, was = shellparam.nparam; */
INT_OFF;
shellparam.nparam -= n;
for (ap1 = shellparam.p; --n >= 0; ap1++) {
free(*ap1);
}
ap2 = shellparam.p;
- while ((*ap2++ = *ap1++) != NULL);
+ while ((*ap2++ = *ap1++) != NULL)
+ continue;
#if ENABLE_ASH_GETOPTS
shellparam.optind = 1;
shellparam.optoff = -1;
* The set command builtin.
*/
static int
-setcmd(int argc, char **argv)
+setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
int retval;
- if (argc == 1)
+ if (!argv[1])
return showvars(nullstr, 0, VUNSET);
INT_OFF;
retval = 1;
}
#if ENABLE_ASH_RANDOM_SUPPORT
-/* Roughly copied from bash.. */
static void
change_random(const char *value)
{
+ /* Galois LFSR parameter */
+ /* Taps at 32 31 29 1: */
+ enum { MASK = 0x8000000b };
+ /* Another example - taps at 32 31 30 10: */
+ /* MASK = 0x00400007 */
+
if (value == NULL) {
/* "get", generate */
- char buf[16];
-
- rseed = rseed * 1103515245 + 12345;
- sprintf(buf, "%d", (unsigned int)((rseed & 32767)));
+ uint32_t t;
+
+ /* LCG has period of 2^32 and alternating lowest bit */
+ random_LCG = 1664525 * random_LCG + 1013904223;
+ /* Galois LFSR has period of 2^32-1 = 3 * 5 * 17 * 257 * 65537 */
+ t = (random_galois_LFSR << 1);
+ if (random_galois_LFSR < 0) /* if we just shifted 1 out of msb... */
+ t ^= MASK;
+ random_galois_LFSR = t;
+ /* Both are weak, combining them gives better randomness
+ * and ~2^64 period. & 0x7fff is probably bash compat
+ * for $RANDOM range. Combining with subtraction is
+ * just for fun. + and ^ would work equally well. */
+ t = (t - random_LCG) & 0x7fff;
/* set without recursion */
- setvar(vrandom.text, buf, VNOFUNC);
+ setvar(vrandom.text, utoa(t), VNOFUNC);
vrandom.flags &= ~VNOFUNC;
} else {
/* set/reset */
- rseed = strtoul(value, (char **)NULL, 10);
+ random_galois_LFSR = random_LCG = strtoul(value, (char **)NULL, 10);
}
}
#endif
return 1;
optnext = optfirst + *param_optind - 1;
- if (*param_optind <= 1 || *optoff < 0 || strlen(optnext[-1]) < *optoff)
+ if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
p = NULL;
else
p = optnext[-1] + *optoff;
}
c = *p++;
- for (q = optstr; *q != c; ) {
+ for (q = optstr; *q != c;) {
if (*q == '\0') {
if (optstr[0] == ':') {
s[0] = c;
/* ============ Shell parser */
-/*
- * NEOF is returned by parsecmd when it encounters an end of file. It
- * must be distinct from NULL, so we use the address of a variable that
- * happens to be handy.
- */
+struct heredoc {
+ struct heredoc *next; /* next here document in list */
+ union node *here; /* redirection node */
+ char *eofmark; /* string indicating end of input */
+ smallint striptabs; /* if set, strip leading tabs */
+};
+
static smallint tokpushback; /* last token pushed back */
-#define NEOF ((union node *)&tokpushback)
static smallint parsebackquote; /* nonzero if we are inside backquotes */
-static int lasttoken; /* last token read */
+static smallint quoteflag; /* set if (part of) last token was quoted */
+static token_id_t lasttoken; /* last token read (integer id Txxx) */
+static struct heredoc *heredoclist; /* list of here documents to read */
static char *wordtext; /* text of last word returned by readtoken */
static struct nodelist *backquotelist;
static union node *redirnode;
static struct heredoc *heredoc;
-static smallint quoteflag; /* set if (part of) last token was quoted */
-
-static void raise_error_syntax(const char *) ATTRIBUTE_NORETURN;
-static void
-raise_error_syntax(const char *msg)
-{
- ash_msg_and_raise_error("syntax error: %s", msg);
- /* NOTREACHED */
-}
+/*
+ * NEOF is returned by parsecmd when it encounters an end of file. It
+ * must be distinct from NULL, so we use the address of a variable that
+ * happens to be handy.
+ */
+#define NEOF ((union node *)&tokpushback)
/*
* Called when an unexpected token is read during the parse. The argument
* is the token that is expected, or -1 if more than one type of token can
* occur at this point.
*/
-static void raise_error_unexpected_syntax(int) ATTRIBUTE_NORETURN;
+static void raise_error_unexpected_syntax(int) NORETURN;
static void
raise_error_unexpected_syntax(int token)
{
char msg[64];
int l;
- l = sprintf(msg, "%s unexpected", tokname(lasttoken));
+ l = sprintf(msg, "unexpected %s", tokname(lasttoken));
if (token >= 0)
sprintf(msg + l, " (expecting %s)", tokname(token));
raise_error_syntax(msg);
#define EOFMARKLEN 79
-struct heredoc {
- struct heredoc *next; /* next here document in list */
- union node *here; /* redirection node */
- char *eofmark; /* string indicating end of input */
- int striptabs; /* if set, strip leading tabs */
-};
-
-static struct heredoc *heredoclist; /* list of here documents to read */
-
/* parsing is heavily cross-recursive, need these forward decls */
static union node *andor(void);
static union node *pipeline(void);
tok = readtoken();
if (tok == TBACKGND) {
if (n2->type == NPIPE) {
- n2->npipe.backgnd = 1;
+ n2->npipe.pipe_backgnd = 1;
} else {
if (n2->type != NREDIR) {
n3 = stzalloc(sizeof(struct nredir));
if (readtoken() == TPIPE) {
pipenode = stzalloc(sizeof(struct npipe));
pipenode->type = NPIPE;
- /*pipenode->npipe.backgnd = 0; - stzalloc did it */
+ /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
lp = stzalloc(sizeof(struct nodelist));
pipenode->npipe.cmdlist = lp;
lp->n = n1;
static void
fixredir(union node *n, const char *text, int err)
{
+ int fd;
+
TRACE(("Fix redir %s %d\n", text, err));
if (!err)
n->ndup.vname = NULL;
- if (isdigit(text[0]) && text[1] == '\0')
- n->ndup.dupfd = text[0] - '0';
+ fd = bb_strtou(text, NULL, 10);
+ if (!errno && fd >= 0)
+ n->ndup.dupfd = fd;
else if (LONE_DASH(text))
n->ndup.dupfd = -1;
else {
if (err)
- raise_error_syntax("Bad fd number");
+ raise_error_syntax("bad fd number");
n->ndup.vname = makename();
}
}
* or backquotes).
*/
static int
-noexpand(char *text)
+noexpand(const char *text)
{
- char *p;
+ const char *p;
char c;
p = text;
continue;
if (c == CTLESC)
p++;
- else if (SIT(c, BASESYNTAX) == CCTL)
+ else if (SIT((signed char)c, BASESYNTAX) == CCTL)
return 0;
}
return 1;
n->type = NXHERE;
TRACE(("Here document %d\n", n->type));
if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
- raise_error_syntax("Illegal eof marker for << redirection");
+ raise_error_syntax("illegal eof marker for << redirection");
rmescapes(wordtext);
here->eofmark = wordtext;
here->next = NULL;
union node *vars, **vpp;
union node **rpp, *redir;
int savecheckkwd;
+#if ENABLE_ASH_BASH_COMPAT
+ smallint double_brackets_flag = 0;
+#endif
args = NULL;
app = &args;
savecheckkwd = CHKALIAS;
for (;;) {
+ int t;
checkkwd = savecheckkwd;
- switch (readtoken()) {
+ t = readtoken();
+ switch (t) {
+#if ENABLE_ASH_BASH_COMPAT
+ case TAND: /* "&&" */
+ case TOR: /* "||" */
+ if (!double_brackets_flag) {
+ tokpushback = 1;
+ goto out;
+ }
+ wordtext = (char *) (t == TAND ? "-a" : "-o");
+#endif
case TWORD:
n = stzalloc(sizeof(struct narg));
n->type = NARG;
/*n->narg.next = NULL; - stzalloc did it */
n->narg.text = wordtext;
+#if ENABLE_ASH_BASH_COMPAT
+ if (strcmp("[[", wordtext) == 0)
+ double_brackets_flag = 1;
+ else if (strcmp("]]", wordtext) == 0)
+ double_brackets_flag = 0;
+#endif
n->narg.backquote = backquotelist;
if (savecheckkwd && isassignment(wordtext)) {
*vpp = n;
if (!goodname(name)
|| ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
) {
- raise_error_syntax("Bad function name");
+ raise_error_syntax("bad function name");
}
n->type = NDEFUN;
checkkwd = CHKNL | CHKKWD | CHKALIAS;
break;
}
case TFOR:
- if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
- raise_error_syntax("Bad for loop variable");
+ if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
+ raise_error_syntax("bad for loop variable");
n1 = stzalloc(sizeof(struct nfor));
n1->type = NFOR;
n1->nfor.var = wordtext;
return n1;
}
+#if ENABLE_ASH_BASH_COMPAT
+static int decode_dollar_squote(void)
+{
+ static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
+ int c, cnt;
+ char *p;
+ char buf[4];
+
+ c = pgetc();
+ p = strchr(C_escapes, c);
+ if (p) {
+ buf[0] = c;
+ p = buf;
+ cnt = 3;
+ if ((unsigned char)(c - '0') <= 7) { /* \ooo */
+ do {
+ c = pgetc();
+ *++p = c;
+ } while ((unsigned char)(c - '0') <= 7 && --cnt);
+ pungetc();
+ } else if (c == 'x') { /* \xHH */
+ do {
+ c = pgetc();
+ *++p = c;
+ } while (isxdigit(c) && --cnt);
+ pungetc();
+ if (cnt == 3) { /* \x but next char is "bad" */
+ c = 'x';
+ goto unrecognized;
+ }
+ } else { /* simple seq like \\ or \t */
+ p++;
+ }
+ *p = '\0';
+ p = buf;
+ c = bb_process_escape_sequence((void*)&p);
+ } else { /* unrecognized "\z": print both chars unless ' or " */
+ if (c != '\'' && c != '"') {
+ unrecognized:
+ c |= 0x100; /* "please encode \, then me" */
+ }
+ }
+ return c;
+}
+#endif
+
/*
* If eofmark is NULL, read a word or a redirection symbol. If eofmark
* is not NULL, read a here document. In the latter case, eofmark is the
* using goto's to implement the subroutine linkage. The following macros
* will run code that appears at the end of readtoken1.
*/
-
#define CHECKEND() {goto checkend; checkend_return:;}
#define PARSEREDIR() {goto parseredir; parseredir_return:;}
#define PARSESUB() {goto parsesub; parsesub_return:;}
#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
#define PARSEARITH() {goto parsearith; parsearith_return:;}
-
static int
readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
{
int parenlevel; /* levels of parens in arithmetic */
int dqvarnest; /* levels of variables expansion within double quotes */
+ IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
+
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &out;
(void) &prevsyntax;
(void) &syntax;
#endif
- startlinno = plinno;
+ startlinno = g_parsefile->linno;
bqlist = NULL;
quotef = 0;
oldstyle = 0;
dqvarnest = 0;
STARTSTACKSTR(out);
- loop: { /* for each line, until end of word */
+ loop:
+ /* For each line, until end of word */
+ {
CHECKEND(); /* set c to PEOF if at end of here document */
for (;;) { /* until end of line or end of word */
CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
if (syntax == BASESYNTAX)
goto endword; /* exit outer loop */
USTPUTC(c, out);
- plinno++;
+ g_parsefile->linno++;
if (doprompt)
setprompt(2);
c = pgetc();
case CCTL:
if (eofmark == NULL || dblquote)
USTPUTC(CTLESC, out);
+#if ENABLE_ASH_BASH_COMPAT
+ if (c == '\\' && bash_dollar_squote) {
+ c = decode_dollar_squote();
+ if (c & 0x100) {
+ USTPUTC('\\', out);
+ c = (unsigned char)c;
+ }
+ }
+#endif
USTPUTC(c, out);
break;
case CBACK: /* backslash */
USTPUTC('\\', out);
}
#endif
- if (dblquote &&
- c != '\\' && c != '`' &&
- c != '$' && (
- c != '"' ||
- eofmark != NULL)
+ if (dblquote && c != '\\'
+ && c != '`' && c != '$'
+ && (c != '"' || eofmark != NULL)
) {
USTPUTC(CTLESC, out);
USTPUTC('\\', out);
dblquote = 1;
goto quotemark;
case CENDQUOTE:
+ IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
if (eofmark != NULL && arinest == 0
&& varnest == 0
) {
USTPUTC(c, out);
}
break;
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
case CLP: /* '(' in arithmetic */
parenlevel++;
USTPUTC(c, out);
case CIGN:
break;
default:
- if (varnest == 0)
+ if (varnest == 0) {
+#if ENABLE_ASH_BASH_COMPAT
+ if (c == '&') {
+ if (pgetc() == '>')
+ c = 0x100 + '>'; /* flag &> */
+ pungetc();
+ }
+#endif
goto endword; /* exit outer loop */
+ }
#if ENABLE_ASH_ALIAS
if (c != PEOA)
#endif
USTPUTC(c, out);
}
- c = pgetc_macro();
- }
+ c = pgetc_fast();
+ } /* for (;;) */
}
endword:
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
if (syntax == ARISYNTAX)
- raise_error_syntax("Missing '))'");
+ raise_error_syntax("missing '))'");
#endif
if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
- raise_error_syntax("Unterminated quoted string");
+ raise_error_syntax("unterminated quoted string");
if (varnest != 0) {
- startlinno = plinno;
+ startlinno = g_parsefile->linno;
/* { */
- raise_error_syntax("Missing '}'");
+ raise_error_syntax("missing '}'");
}
USTPUTC('\0', out);
len = out - (char *)stackblock();
out = stackblock();
if (eofmark == NULL) {
- if ((c == '>' || c == '<')
+ if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
&& quotef == 0
- && len <= 2
- && (*out == '\0' || isdigit(*out))) {
- PARSEREDIR();
- return lasttoken = TREDIR;
- } else {
- pungetc();
+ ) {
+ if (isdigit_str9(out)) {
+ PARSEREDIR(); /* passed as params: out, c */
+ lasttoken = TREDIR;
+ return lasttoken;
+ }
+ /* else: non-number X seen, interpret it
+ * as "NNNX>file" = "NNNX >file" */
}
+ pungetc();
}
quoteflag = quotef;
backquotelist = bqlist;
char *p, *q;
p = line;
- for (q = eofmark + 1; *q && *p == *q; p++, q++);
+ for (q = eofmark + 1; *q && *p == *q; p++, q++)
+ continue;
if (*p == '\n' && *q == '\0') {
c = PEOF;
- plinno++;
+ g_parsefile->linno++;
needprompt = doprompt;
} else {
pushstring(line, NULL);
* first character of the redirection operator.
*/
parseredir: {
- char fd = *out;
+ /* out is already checked to be a valid number or "" */
+ int fd = (*out == '\0' ? -1 : atoi(out));
union node *np;
np = stzalloc(sizeof(struct nfile));
np->type = NCLOBBER;
else if (c == '&')
np->type = NTOFD;
+ /* it also can be NTO2 (>&file), but we can't figure it out yet */
else {
np->type = NTO;
pungetc();
}
- } else { /* c == '<' */
+ }
+#if ENABLE_ASH_BASH_COMPAT
+ else if (c == 0x100 + '>') { /* this flags &> redirection */
+ np->nfile.fd = 1;
+ pgetc(); /* this is '>', no need to check */
+ np->type = NTO2;
+ }
+#endif
+ else { /* c == '<' */
/*np->nfile.fd = 0; - stzalloc did it */
c = pgetc();
switch (c) {
break;
}
}
- if (fd != '\0')
- np->nfile.fd = fd - '0';
+ if (fd >= 0)
+ np->nfile.fd = fd;
redirnode = np;
goto parseredir_return;
}
/* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
* (assuming ascii char codes, as the original implementation did) */
#define is_special(c) \
- ((((unsigned int)c) - 33 < 32) \
- && ((0xc1ff920dUL >> (((unsigned int)c) - 33)) & 1))
+ (((unsigned)(c) - 33 < 32) \
+ && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
parsesub: {
int subtype;
int typeloc;
static const char types[] ALIGN1 = "}-+?=";
c = pgetc();
- if (
- c <= PEOA_OR_PEOF ||
- (c != '(' && c != '{' && !is_name(c) && !is_special(c))
+ if (c <= PEOA_OR_PEOF
+ || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
) {
- USTPUTC('$', out);
+#if ENABLE_ASH_BASH_COMPAT
+ if (c == '\'')
+ bash_dollar_squote = 1;
+ else
+#endif
+ USTPUTC('$', out);
pungetc();
} else if (c == '(') { /* $(command) or $((arith)) */
if (pgetc() == '(') {
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
PARSEARITH();
#else
- raise_error_syntax("We unsupport $((arith))");
+ raise_error_syntax("you disabled math support for $((arith)) syntax");
#endif
} else {
pungetc();
} else if (is_special(c)) {
USTPUTC(c, out);
c = pgetc();
- } else
- badsub: raise_error_syntax("Bad substitution");
+ } else {
+ badsub:
+ raise_error_syntax("bad substitution");
+ }
STPUTC('=', out);
flags = 0;
if (subtype == 0) {
switch (c) {
case ':':
- flags = VSNUL;
c = pgetc();
+#if ENABLE_ASH_BASH_COMPAT
+ if (c == ':' || c == '$' || isdigit(c)) {
+ pungetc();
+ subtype = VSSUBSTR;
+ break;
+ }
+#endif
+ flags = VSNUL;
/*FALLTHROUGH*/
default:
p = strchr(types, c);
subtype = p - types + VSNORMAL;
break;
case '%':
- case '#':
- {
- int cc = c;
- subtype = c == '#' ? VSTRIMLEFT :
- VSTRIMRIGHT;
- c = pgetc();
- if (c == cc)
- subtype++;
- else
- pungetc();
- break;
- }
+ case '#': {
+ int cc = c;
+ subtype = c == '#' ? VSTRIMLEFT : VSTRIMRIGHT;
+ c = pgetc();
+ if (c == cc)
+ subtype++;
+ else
+ pungetc();
+ break;
+ }
+#if ENABLE_ASH_BASH_COMPAT
+ case '/':
+ subtype = VSREPLACE;
+ c = pgetc();
+ if (c == '/')
+ subtype++; /* VSREPLACEALL */
+ else
+ pungetc();
+ break;
+#endif
}
} else {
pungetc();
case '\\':
pc = pgetc();
if (pc == '\n') {
- plinno++;
+ g_parsefile->linno++;
if (doprompt)
setprompt(2);
/*
#if ENABLE_ASH_ALIAS
case PEOA:
#endif
- startlinno = plinno;
+ startlinno = g_parsefile->linno;
raise_error_syntax("EOF in backquote substitution");
case '\n':
- plinno++;
+ g_parsefile->linno++;
needprompt = doprompt;
break;
goto parsebackq_newreturn;
}
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
/*
* Parse an arithmetic expansion (indicate start of one and set state)
*/
#ifdef NEW_xxreadtoken
/* singles must be first! */
static const char xxreadtoken_chars[7] ALIGN1 = {
- '\n', '(', ')', '&', '|', ';', 0
+ '\n', '(', ')', /* singles */
+ '&', '|', ';', /* doubles */
+ 0
};
+#define xxreadtoken_singles 3
+#define xxreadtoken_doubles 3
+
static const char xxreadtoken_tokens[] ALIGN1 = {
TNL, TLP, TRP, /* only single occurrence allowed */
TBACKGND, TPIPE, TSEMI, /* if single occurrence */
TAND, TOR, TENDCASE /* if double occurrence */
};
-#define xxreadtoken_doubles \
- (sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars))
-#define xxreadtoken_singles \
- (sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1)
-
static int
xxreadtoken(void)
{
if (needprompt) {
setprompt(2);
}
- startlinno = plinno;
+ startlinno = g_parsefile->linno;
for (;;) { /* until token or start of word found */
- c = pgetc_macro();
+ c = pgetc_fast();
+ if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
+ continue;
- if ((c != ' ') && (c != '\t')
-#if ENABLE_ASH_ALIAS
- && (c != PEOA)
-#endif
- ) {
- if (c == '#') {
- while ((c = pgetc()) != '\n' && c != PEOF);
+ if (c == '#') {
+ while ((c = pgetc()) != '\n' && c != PEOF)
+ continue;
+ pungetc();
+ } else if (c == '\\') {
+ if (pgetc() != '\n') {
pungetc();
- } else if (c == '\\') {
- if (pgetc() != '\n') {
- pungetc();
- goto READTOKEN1;
- }
- startlinno = ++plinno;
- if (doprompt)
- setprompt(2);
- } else {
- const char *p
- = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
+ break; /* return readtoken1(...) */
+ }
+ startlinno = ++g_parsefile->linno;
+ if (doprompt)
+ setprompt(2);
+ } else {
+ const char *p;
- if (c != PEOF) {
- if (c == '\n') {
- plinno++;
- needprompt = doprompt;
- }
+ p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
+ if (c != PEOF) {
+ if (c == '\n') {
+ g_parsefile->linno++;
+ needprompt = doprompt;
+ }
- p = strchr(xxreadtoken_chars, c);
- if (p == NULL) {
- READTOKEN1:
- return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
- }
+ p = strchr(xxreadtoken_chars, c);
+ if (p == NULL)
+ break; /* return readtoken1(...) */
- if (p - xxreadtoken_chars >= xxreadtoken_singles) {
- if (pgetc() == *p) { /* double occurrence? */
- p += xxreadtoken_doubles + 1;
- } else {
- pungetc();
- }
+ if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
+ int cc = pgetc();
+ if (cc == c) { /* double occurrence? */
+ p += xxreadtoken_doubles + 1;
+ } else {
+ pungetc();
+#if ENABLE_ASH_BASH_COMPAT
+ if (c == '&' && cc == '>') /* &> */
+ break; /* return readtoken1(...) */
+#endif
}
}
- return lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
}
+ lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
+ return lasttoken;
}
- } /* for */
+ } /* for (;;) */
+
+ return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
}
-#else
+#else /* old xxreadtoken */
#define RETURN(token) return lasttoken = token
static int
xxreadtoken(void)
if (needprompt) {
setprompt(2);
}
- startlinno = plinno;
+ startlinno = g_parsefile->linno;
for (;;) { /* until token or start of word found */
- c = pgetc_macro();
+ c = pgetc_fast();
switch (c) {
case ' ': case '\t':
#if ENABLE_ASH_ALIAS
#endif
continue;
case '#':
- while ((c = pgetc()) != '\n' && c != PEOF);
+ while ((c = pgetc()) != '\n' && c != PEOF)
+ continue;
pungetc();
continue;
case '\\':
if (pgetc() == '\n') {
- startlinno = ++plinno;
+ startlinno = ++g_parsefile->linno;
if (doprompt)
setprompt(2);
continue;
pungetc();
goto breakloop;
case '\n':
- plinno++;
+ g_parsefile->linno++;
needprompt = doprompt;
RETURN(TNL);
case PEOF:
return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
#undef RETURN
}
-#endif /* NEW_xxreadtoken */
+#endif /* old xxreadtoken */
static int
readtoken(void)
{
union node n;
- /* XXX Fix (char *) cast. */
+ /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
+ * and token processing _can_ alter it (delete NULs etc). */
setinputstring((char *)ps);
readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
popfile();
* The eval command.
*/
static int
-evalcmd(int argc, char **argv)
+evalcmd(int argc UNUSED_PARAM, char **argv)
{
char *p;
char *concat;
- char **ap;
- if (argc > 1) {
+ if (argv[1]) {
p = argv[1];
- if (argc > 2) {
+ argv += 2;
+ if (argv[0]) {
STARTSTACKSTR(concat);
- ap = argv + 2;
for (;;) {
concat = stack_putstr(p, concat);
- p = *ap++;
+ p = *argv++;
if (p == NULL)
break;
STPUTC(' ', concat);
setstackmark(&smark);
#if JOBS
- if (jobctl)
+ if (doing_jobctl)
showjobs(stderr, SHOW_CHANGED);
#endif
inter = 0;
#endif
}
n = parsecmd(inter);
- /* showtree(n); DEBUG */
+#if DEBUG
+ showtree(n);
+#endif
if (n == NEOF) {
if (!top || numeof >= 50)
break;
if (strchr(name, '/'))
return name;
+ /* IIRC standards do not say whether . is to be searched.
+ * And it is even smaller this way, making it unconditional for now:
+ */
+ if (1) { /* ENABLE_ASH_BASH_COMPAT */
+ fullname = name;
+ goto try_cur_dir;
+ }
+
while ((fullname = padvance(&path, name)) != NULL) {
+ try_cur_dir:
if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
/*
* Don't bother freeing here, since it will
for (sp = cmdenviron; sp; sp = sp->next)
setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
- if (argc >= 2) { /* That's what SVR2 does */
- char *fullname;
-
- fullname = find_dot_file(argv[1]);
-
- if (argc > 2) {
+ if (argv[1]) { /* That's what SVR2 does */
+ char *fullname = find_dot_file(argv[1]);
+ argv += 2;
+ argc -= 2;
+ if (argc) { /* argc > 0, argv[0] != NULL */
saveparam = shellparam;
shellparam.malloced = 0;
- shellparam.nparam = argc - 2;
- shellparam.p = argv + 2;
+ shellparam.nparam = argc;
+ shellparam.p = argv;
};
setinputfile(fullname, INPUT_PUSH_FILE);
cmdloop(0);
popfile();
- if (argc > 2) {
+ if (argc) {
freeparam(&shellparam);
shellparam = saveparam;
};
}
static int
-exitcmd(int argc, char **argv)
+exitcmd(int argc UNUSED_PARAM, char **argv)
{
if (stoppedjobs())
return 0;
- if (argc > 1)
+ if (argv[1])
exitstatus = number(argv[1]);
raise_exception(EXEXIT);
/* NOTREACHED */
}
-#if ENABLE_ASH_BUILTIN_ECHO
-static int
-echocmd(int argc, char **argv)
-{
- return echo_main(argc, argv);
-}
-#endif
-
-#if ENABLE_ASH_BUILTIN_TEST
-static int
-testcmd(int argc, char **argv)
-{
- return test_main(argc, argv);
-}
-#endif
-
/*
* Read a file containing shell functions.
*/
}
#if ENABLE_FEATURE_SH_STANDALONE
- if (find_applet_by_name(name) >= 0) {
- entry->cmdtype = CMDNORMAL;
- entry->u.index = -1;
- return;
+ {
+ int applet_no = find_applet_by_name(name);
+ if (applet_no >= 0) {
+ entry->cmdtype = CMDNORMAL;
+ entry->u.index = -2 - applet_no;
+ return;
+ }
}
#endif
if (bcmd)
goto builtin_success;
continue;
- } else if (!(act & DO_NOFUNC)
- && prefix(pathopt, "func")) {
- /* handled below */
- } else {
- /* ignore unimplemented options */
+ }
+ if ((act & DO_NOFUNC)
+ || !prefix(pathopt, "func")
+ ) { /* ignore unimplemented options */
continue;
}
}
* The trap builtin.
*/
static int
-trapcmd(int argc, char **argv)
+trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
char *action;
char **ap;
if (!*ap) {
for (signo = 0; signo < NSIG; signo++) {
if (trap[signo] != NULL) {
- const char *sn;
-
- sn = get_signame(signo);
out1fmt("trap -- %s %s\n",
- single_quote(trap[signo]), sn);
+ single_quote(trap[signo]),
+ get_signame(signo));
}
}
return 0;
}
- if (!ap[1])
- action = NULL;
- else
+ action = NULL;
+ if (ap[1])
action = *ap++;
while (*ap) {
signo = get_signum(*ap);
* Lists available builtins
*/
static int
-helpcmd(int argc, char **argv)
+helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
- int col, i;
+ unsigned col;
+ unsigned i;
- out1fmt("\nBuilt-in commands:\n-------------------\n");
+ out1fmt("\n"
+ "Built-in commands:\n"
+ "------------------\n");
for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
builtintab[i].name + 1);
* The export and readonly commands.
*/
static int
-exportcmd(int argc, char **argv)
+exportcmd(int argc UNUSED_PARAM, char **argv)
{
struct var *vp;
char *name;
const char *p;
char **aptr;
- int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
+ int flag = argv[0][0] == 'r' ? VREADONLY : VEXPORT;
if (nextopt("p") != 'p') {
aptr = argptr;
* with the same name.
*/
static int
-unsetcmd(int argc, char **argv)
+unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
char **ap;
int i;
};
static int
-timescmd(int ac, char **av)
+timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
long clk_tck, s, t;
const unsigned char *p;
return 0;
}
-#if ENABLE_ASH_MATH_SUPPORT
-static arith_t
-dash_arith(const char *s)
-{
- arith_t result;
- int errcode = 0;
-
- INT_OFF;
- result = arith(s, &errcode);
- if (errcode < 0) {
- if (errcode == -3)
- ash_msg_and_raise_error("exponent less than 0");
- if (errcode == -2)
- ash_msg_and_raise_error("divide by zero");
- if (errcode == -5)
- ash_msg_and_raise_error("expression recursion loop detected");
- raise_error_syntax(s);
- }
- INT_ON;
-
- return result;
-}
-
+#if ENABLE_SH_MATH_SUPPORT
/*
- * The let builtin. partial stolen from GNU Bash, the Bourne Again SHell.
- * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
+ * The let builtin. partial stolen from GNU Bash, the Bourne Again SHell.
+ * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
*
- * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
+ * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
*/
static int
-letcmd(int argc, char **argv)
+letcmd(int argc UNUSED_PARAM, char **argv)
{
- char **ap;
- arith_t i = 0;
+ arith_t i;
- ap = argv + 1;
- if (!*ap)
+ argv++;
+ if (!*argv)
ash_msg_and_raise_error("expression expected");
- for (ap = argv + 1; *ap; ap++) {
- i = dash_arith(*ap);
- }
+ do {
+ i = ash_arith(*argv);
+ } while (*++argv);
return !i;
}
-#endif /* ASH_MATH_SUPPORT */
+#endif /* SH_MATH_SUPPORT */
/* ============ miscbltin.c
#endif
/*
- * The read builtin. The -e option causes backslashes to escape the
- * following character.
- *
+ * The read builtin. Options:
+ * -r Do not interpret '\' specially
+ * -s Turn off echo (tty only)
+ * -n NCHARS Read NCHARS max
+ * -p PROMPT Display PROMPT on stderr (if input is from tty)
+ * -t SECONDS Timeout after SECONDS (tty or pipe only)
+ * -u FD Read from given FD instead of fd 0
* This uses unbuffered input, which may be avoidable in some cases.
+ * TODO: bash also has:
+ * -a ARRAY Read into array[0],[1],etc
+ * -d DELIM End on DELIM char, not newline
+ * -e Use line editing (tty only)
*/
static int
-readcmd(int argc, char **argv)
+readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
+ static const char *const arg_REPLY[] = { "REPLY", NULL };
+
char **ap;
int backslash;
char c;
int startword;
int status;
int i;
+ int fd = 0;
#if ENABLE_ASH_READ_NCHARS
- int n_flag = 0;
- int nchars = 0;
+ int nchars = 0; /* if != 0, -n is in effect */
int silent = 0;
struct termios tty, old_tty;
#endif
#if ENABLE_ASH_READ_TIMEOUT
- fd_set set;
- struct timeval ts;
-
- ts.tv_sec = ts.tv_usec = 0;
+ unsigned end_ms = 0;
+ unsigned timeout = 0;
#endif
rflag = 0;
prompt = NULL;
-#if ENABLE_ASH_READ_NCHARS && ENABLE_ASH_READ_TIMEOUT
- while ((i = nextopt("p:rt:n:s")) != '\0')
-#elif ENABLE_ASH_READ_NCHARS
- while ((i = nextopt("p:rn:s")) != '\0')
-#elif ENABLE_ASH_READ_TIMEOUT
- while ((i = nextopt("p:rt:")) != '\0')
-#else
- while ((i = nextopt("p:r")) != '\0')
-#endif
- {
+ while ((i = nextopt("p:u:r"
+ IF_ASH_READ_TIMEOUT("t:")
+ IF_ASH_READ_NCHARS("n:s")
+ )) != '\0') {
switch (i) {
case 'p':
prompt = optionarg;
nchars = bb_strtou(optionarg, NULL, 10);
if (nchars < 0 || errno)
ash_msg_and_raise_error("invalid count");
- n_flag = nchars; /* just a flag "nchars is nonzero" */
+ /* nchars == 0: off (bash 3.2 does this too) */
break;
case 's':
silent = 1;
#endif
#if ENABLE_ASH_READ_TIMEOUT
case 't':
+ timeout = bb_strtou(optionarg, NULL, 10);
+ if (errno || timeout > UINT_MAX / 2048)
+ ash_msg_and_raise_error("invalid timeout");
+ timeout *= 1000;
+#if 0 /* even bash have no -t N.NNN support */
ts.tv_sec = bb_strtou(optionarg, &p, 10);
ts.tv_usec = 0;
/* EINVAL means number is ok, but not terminated by NUL */
if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */
ash_msg_and_raise_error("invalid timeout");
}
+#endif /* if 0 */
break;
#endif
case 'r':
rflag = 1;
break;
+ case 'u':
+ fd = bb_strtou(optionarg, NULL, 10);
+ if (fd < 0 || errno)
+ ash_msg_and_raise_error("invalid file descriptor");
+ break;
default:
break;
}
}
- if (prompt && isatty(0)) {
+ if (prompt && isatty(fd)) {
out2str(prompt);
}
ap = argptr;
if (*ap == NULL)
- ash_msg_and_raise_error("arg count");
+ ap = (char**)arg_REPLY;
ifs = bltinlookup("IFS");
if (ifs == NULL)
ifs = defifs;
#if ENABLE_ASH_READ_NCHARS
- if (n_flag || silent) {
- if (tcgetattr(0, &tty) != 0) {
- /* Not a tty */
- n_flag = 0;
- silent = 0;
- } else {
- old_tty = tty;
- if (n_flag) {
- tty.c_lflag &= ~ICANON;
- tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
- }
- if (silent) {
- tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
- }
- tcsetattr(0, TCSANOW, &tty);
+ tcgetattr(fd, &tty);
+ old_tty = tty;
+ if (nchars || silent) {
+ if (nchars) {
+ tty.c_lflag &= ~ICANON;
+ tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
+ }
+ if (silent) {
+ tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
}
+ /* if tcgetattr failed, tcsetattr will fail too.
+ * Ignoring, it's harmless. */
+ tcsetattr(fd, TCSANOW, &tty);
}
#endif
+
+ status = 0;
+ startword = 2;
+ backslash = 0;
#if ENABLE_ASH_READ_TIMEOUT
- if (ts.tv_sec || ts.tv_usec) {
- FD_ZERO(&set);
- FD_SET(0, &set);
+ if (timeout) /* NB: ensuring end_ms is nonzero */
+ end_ms = ((unsigned)(monotonic_us() / 1000) + timeout) | 1;
+#endif
+ STARTSTACKSTR(p);
+ do {
+ const char *is_ifs;
- /* poll-based wait produces bigger code, using select */
- i = select(1, &set, NULL, NULL, &ts);
- if (!i) { /* timed out! */
+#if ENABLE_ASH_READ_TIMEOUT
+ if (end_ms) {
+ struct pollfd pfd[1];
+ pfd[0].fd = fd;
+ pfd[0].events = POLLIN;
+ timeout = end_ms - (unsigned)(monotonic_us() / 1000);
+ if ((int)timeout <= 0 /* already late? */
+ || safe_poll(pfd, 1, timeout) != 1 /* no? wait... */
+ ) { /* timed out! */
#if ENABLE_ASH_READ_NCHARS
- if (n_flag)
- tcsetattr(0, TCSANOW, &old_tty);
+ tcsetattr(fd, TCSANOW, &old_tty);
#endif
- return 1;
+ return 1;
+ }
}
- }
#endif
- status = 0;
- startword = 1;
- backslash = 0;
- STARTSTACKSTR(p);
- do {
- if (nonblock_safe_read(0, &c, 1) != 1) {
+ if (nonblock_safe_read(fd, &c, 1) != 1) {
status = 1;
break;
}
continue;
}
if (!rflag && c == '\\') {
- backslash++;
+ backslash = 1;
continue;
}
if (c == '\n')
break;
- if (startword && *ifs == ' ' && strchr(ifs, c)) {
- continue;
+ /* $IFS splitting */
+/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */
+ is_ifs = strchr(ifs, c);
+ if (startword && is_ifs) {
+ if (isspace(c))
+ continue;
+ /* it is a non-space ifs char */
+ startword--;
+ if (startword == 1) /* first one? */
+ continue; /* yes, it is not next word yet */
}
startword = 0;
- if (ap[1] != NULL && strchr(ifs, c) != NULL) {
+ if (ap[1] != NULL && is_ifs) {
+ const char *beg;
STACKSTRNUL(p);
- setvar(*ap, stackblock(), 0);
+ beg = stackblock();
+ setvar(*ap, beg, 0);
ap++;
- startword = 1;
+ /* can we skip one non-space ifs char? (2: yes) */
+ startword = isspace(c) ? 2 : 1;
STARTSTACKSTR(p);
- } else {
- put:
- STPUTC(c, p);
+ continue;
}
+ put:
+ STPUTC(c, p);
}
/* end of do {} while: */
#if ENABLE_ASH_READ_NCHARS
- while (!n_flag || --nchars);
+ while (--nchars);
#else
while (1);
#endif
#if ENABLE_ASH_READ_NCHARS
- if (n_flag || silent)
- tcsetattr(0, TCSANOW, &old_tty);
+ tcsetattr(fd, TCSANOW, &old_tty);
#endif
STACKSTRNUL(p);
- /* Remove trailing blanks */
- while ((char *)stackblock() <= --p && strchr(ifs, *p) != NULL)
+ /* Remove trailing space ifs chars */
+ while ((char *)stackblock() <= --p && isspace(*p) && strchr(ifs, *p) != NULL)
*p = '\0';
setvar(*ap, stackblock(), 0);
while (*++ap != NULL)
}
static int
-umaskcmd(int argc, char **argv)
+umaskcmd(int argc UNUSED_PARAM, char **argv)
{
static const char permuser[3] ALIGN1 = "ugo";
static const char permmode[3] ALIGN1 = "rwx";
S_IROTH, S_IWOTH, S_IXOTH
};
+ /* TODO: use bb_parse_mode() instead */
+
char *ap;
mode_t mask;
int i;
*
* Public domain.
*/
-
struct limits {
uint8_t cmd; /* RLIMIT_xxx fit into it */
uint8_t factor_shift; /* shift by to get rlim_{cur,max} values */
}
static int
-ulimitcmd(int argc, char **argv)
+ulimitcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
int c;
rlim_t val = 0;
while ((c = *p++) >= '0' && c <= '9') {
val = (val * 10) + (long)(c - '0');
+ // val is actually 'unsigned long int' and can't get < 0
if (val < (rlim_t) 0)
break;
}
return 0;
}
-
-/* ============ Math support */
-
-#if ENABLE_ASH_MATH_SUPPORT
-
-/* Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
-
- Permission is hereby granted, free of charge, to any person obtaining
- a copy of this software and associated documentation files (the
- "Software"), to deal in the Software without restriction, including
- without limitation the rights to use, copy, modify, merge, publish,
- distribute, sublicense, and/or sell copies of the Software, and to
- permit persons to whom the Software is furnished to do so, subject to
- the following conditions:
-
- The above copyright notice and this permission notice shall be
- included in all copies or substantial portions of the Software.
-
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
- IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
- CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
- TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
- SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-*/
-
-/* This is my infix parser/evaluator. It is optimized for size, intended
- * as a replacement for yacc-based parsers. However, it may well be faster
- * than a comparable parser written in yacc. The supported operators are
- * listed in #defines below. Parens, order of operations, and error handling
- * are supported. This code is thread safe. The exact expression format should
- * be that which POSIX specifies for shells. */
-
-/* The code uses a simple two-stack algorithm. See
- * http://www.onthenet.com.au/~grahamis/int2008/week02/lect02.html
- * for a detailed explanation of the infix-to-postfix algorithm on which
- * this is based (this code differs in that it applies operators immediately
- * to the stack instead of adding them to a queue to end up with an
- * expression). */
-
-/* To use the routine, call it with an expression string and error return
- * pointer */
-
-/*
- * Aug 24, 2001 Manuel Novoa III
- *
- * Reduced the generated code size by about 30% (i386) and fixed several bugs.
- *
- * 1) In arith_apply():
- * a) Cached values of *numptr and &(numptr[-1]).
- * b) Removed redundant test for zero denominator.
- *
- * 2) In arith():
- * a) Eliminated redundant code for processing operator tokens by moving
- * to a table-based implementation. Also folded handling of parens
- * into the table.
- * b) Combined all 3 loops which called arith_apply to reduce generated
- * code size at the cost of speed.
- *
- * 3) The following expressions were treated as valid by the original code:
- * 1() , 0! , 1 ( *3 ) .
- * These bugs have been fixed by internally enclosing the expression in
- * parens and then checking that all binary ops and right parens are
- * preceded by a valid expression (NUM_TOKEN).
- *
- * Note: It may be desirable to replace Aaron's test for whitespace with
- * ctype's isspace() if it is used by another busybox applet or if additional
- * whitespace chars should be considered. Look below the "#include"s for a
- * precompiler test.
- */
-
-/*
- * Aug 26, 2001 Manuel Novoa III
- *
- * Return 0 for null expressions. Pointed out by Vladimir Oleynik.
- *
- * Merge in Aaron's comments previously posted to the busybox list,
- * modified slightly to take account of my changes to the code.
- *
- */
-
-/*
- * (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
- *
- * - allow access to variable,
- * used recursive find value indirection (c=2*2; a="c"; $((a+=2)) produce 6)
- * - realize assign syntax (VAR=expr, +=, *= etc)
- * - realize exponentiation (** operator)
- * - realize comma separated - expr, expr
- * - realise ++expr --expr expr++ expr--
- * - realise expr ? expr : expr (but, second expr calculate always)
- * - allow hexadecimal and octal numbers
- * - was restored loses XOR operator
- * - remove one goto label, added three ;-)
- * - protect $((num num)) as true zero expr (Manuel`s error)
- * - always use special isspace(), see comment from bash ;-)
- */
-
-#define arith_isspace(arithval) \
- (arithval == ' ' || arithval == '\n' || arithval == '\t')
-
-typedef unsigned char operator;
-
-/* An operator's token id is a bit of a bitfield. The lower 5 bits are the
- * precedence, and 3 high bits are an ID unique across operators of that
- * precedence. The ID portion is so that multiple operators can have the
- * same precedence, ensuring that the leftmost one is evaluated first.
- * Consider * and /. */
-
-#define tok_decl(prec,id) (((id)<<5)|(prec))
-#define PREC(op) ((op) & 0x1F)
-
-#define TOK_LPAREN tok_decl(0,0)
-
-#define TOK_COMMA tok_decl(1,0)
-
-#define TOK_ASSIGN tok_decl(2,0)
-#define TOK_AND_ASSIGN tok_decl(2,1)
-#define TOK_OR_ASSIGN tok_decl(2,2)
-#define TOK_XOR_ASSIGN tok_decl(2,3)
-#define TOK_PLUS_ASSIGN tok_decl(2,4)
-#define TOK_MINUS_ASSIGN tok_decl(2,5)
-#define TOK_LSHIFT_ASSIGN tok_decl(2,6)
-#define TOK_RSHIFT_ASSIGN tok_decl(2,7)
-
-#define TOK_MUL_ASSIGN tok_decl(3,0)
-#define TOK_DIV_ASSIGN tok_decl(3,1)
-#define TOK_REM_ASSIGN tok_decl(3,2)
-
-/* all assign is right associativity and precedence eq, but (7+3)<<5 > 256 */
-#define convert_prec_is_assing(prec) do { if (prec == 3) prec = 2; } while (0)
-
-/* conditional is right associativity too */
-#define TOK_CONDITIONAL tok_decl(4,0)
-#define TOK_CONDITIONAL_SEP tok_decl(4,1)
-
-#define TOK_OR tok_decl(5,0)
-
-#define TOK_AND tok_decl(6,0)
-
-#define TOK_BOR tok_decl(7,0)
-
-#define TOK_BXOR tok_decl(8,0)
-
-#define TOK_BAND tok_decl(9,0)
-
-#define TOK_EQ tok_decl(10,0)
-#define TOK_NE tok_decl(10,1)
-
-#define TOK_LT tok_decl(11,0)
-#define TOK_GT tok_decl(11,1)
-#define TOK_GE tok_decl(11,2)
-#define TOK_LE tok_decl(11,3)
-
-#define TOK_LSHIFT tok_decl(12,0)
-#define TOK_RSHIFT tok_decl(12,1)
-
-#define TOK_ADD tok_decl(13,0)
-#define TOK_SUB tok_decl(13,1)
-
-#define TOK_MUL tok_decl(14,0)
-#define TOK_DIV tok_decl(14,1)
-#define TOK_REM tok_decl(14,2)
-
-/* exponent is right associativity */
-#define TOK_EXPONENT tok_decl(15,1)
-
-/* For now unary operators. */
-#define UNARYPREC 16
-#define TOK_BNOT tok_decl(UNARYPREC,0)
-#define TOK_NOT tok_decl(UNARYPREC,1)
-
-#define TOK_UMINUS tok_decl(UNARYPREC+1,0)
-#define TOK_UPLUS tok_decl(UNARYPREC+1,1)
-
-#define PREC_PRE (UNARYPREC+2)
-
-#define TOK_PRE_INC tok_decl(PREC_PRE, 0)
-#define TOK_PRE_DEC tok_decl(PREC_PRE, 1)
-
-#define PREC_POST (UNARYPREC+3)
-
-#define TOK_POST_INC tok_decl(PREC_POST, 0)
-#define TOK_POST_DEC tok_decl(PREC_POST, 1)
-
-#define SPEC_PREC (UNARYPREC+4)
-
-#define TOK_NUM tok_decl(SPEC_PREC, 0)
-#define TOK_RPAREN tok_decl(SPEC_PREC, 1)
-
-#define NUMPTR (*numstackptr)
-
-static int
-tok_have_assign(operator op)
-{
- operator prec = PREC(op);
-
- convert_prec_is_assing(prec);
- return (prec == PREC(TOK_ASSIGN) ||
- prec == PREC_PRE || prec == PREC_POST);
-}
-
-static int
-is_right_associativity(operator prec)
-{
- return (prec == PREC(TOK_ASSIGN) || prec == PREC(TOK_EXPONENT)
- || prec == PREC(TOK_CONDITIONAL));
-}
-
-typedef struct ARITCH_VAR_NUM {
- arith_t val;
- arith_t contidional_second_val;
- char contidional_second_val_initialized;
- char *var; /* if NULL then is regular number,
- else is variable name */
-} v_n_t;
-
-typedef struct CHK_VAR_RECURSIVE_LOOPED {
- const char *var;
- struct CHK_VAR_RECURSIVE_LOOPED *next;
-} chk_var_recursive_looped_t;
-
-static chk_var_recursive_looped_t *prev_chk_var_recursive;
-
-static int
-arith_lookup_val(v_n_t *t)
-{
- if (t->var) {
- const char * p = lookupvar(t->var);
-
- if (p) {
- int errcode;
-
- /* recursive try as expression */
- chk_var_recursive_looped_t *cur;
- chk_var_recursive_looped_t cur_save;
-
- for (cur = prev_chk_var_recursive; cur; cur = cur->next) {
- if (strcmp(cur->var, t->var) == 0) {
- /* expression recursion loop detected */
- return -5;
- }
- }
- /* save current lookuped var name */
- cur = prev_chk_var_recursive;
- cur_save.var = t->var;
- cur_save.next = cur;
- prev_chk_var_recursive = &cur_save;
-
- t->val = arith (p, &errcode);
- /* restore previous ptr after recursiving */
- prev_chk_var_recursive = cur;
- return errcode;
- }
- /* allow undefined var as 0 */
- t->val = 0;
- }
- return 0;
-}
-
-/* "applying" a token means performing it on the top elements on the integer
- * stack. For a unary operator it will only change the top element, but a
- * binary operator will pop two arguments and push a result */
-static int
-arith_apply(operator op, v_n_t *numstack, v_n_t **numstackptr)
-{
- v_n_t *numptr_m1;
- arith_t numptr_val, rez;
- int ret_arith_lookup_val;
-
- /* There is no operator that can work without arguments */
- if (NUMPTR == numstack) goto err;
- numptr_m1 = NUMPTR - 1;
-
- /* check operand is var with noninteger value */
- ret_arith_lookup_val = arith_lookup_val(numptr_m1);
- if (ret_arith_lookup_val)
- return ret_arith_lookup_val;
-
- rez = numptr_m1->val;
- if (op == TOK_UMINUS)
- rez *= -1;
- else if (op == TOK_NOT)
- rez = !rez;
- else if (op == TOK_BNOT)
- rez = ~rez;
- else if (op == TOK_POST_INC || op == TOK_PRE_INC)
- rez++;
- else if (op == TOK_POST_DEC || op == TOK_PRE_DEC)
- rez--;
- else if (op != TOK_UPLUS) {
- /* Binary operators */
-
- /* check and binary operators need two arguments */
- if (numptr_m1 == numstack) goto err;
-
- /* ... and they pop one */
- --NUMPTR;
- numptr_val = rez;
- if (op == TOK_CONDITIONAL) {
- if (! numptr_m1->contidional_second_val_initialized) {
- /* protect $((expr1 ? expr2)) without ": expr" */
- goto err;
- }
- rez = numptr_m1->contidional_second_val;
- } else if (numptr_m1->contidional_second_val_initialized) {
- /* protect $((expr1 : expr2)) without "expr ? " */
- goto err;
- }
- numptr_m1 = NUMPTR - 1;
- if (op != TOK_ASSIGN) {
- /* check operand is var with noninteger value for not '=' */
- ret_arith_lookup_val = arith_lookup_val(numptr_m1);
- if (ret_arith_lookup_val)
- return ret_arith_lookup_val;
- }
- if (op == TOK_CONDITIONAL) {
- numptr_m1->contidional_second_val = rez;
- }
- rez = numptr_m1->val;
- if (op == TOK_BOR || op == TOK_OR_ASSIGN)
- rez |= numptr_val;
- else if (op == TOK_OR)
- rez = numptr_val || rez;
- else if (op == TOK_BAND || op == TOK_AND_ASSIGN)
- rez &= numptr_val;
- else if (op == TOK_BXOR || op == TOK_XOR_ASSIGN)
- rez ^= numptr_val;
- else if (op == TOK_AND)
- rez = rez && numptr_val;
- else if (op == TOK_EQ)
- rez = (rez == numptr_val);
- else if (op == TOK_NE)
- rez = (rez != numptr_val);
- else if (op == TOK_GE)
- rez = (rez >= numptr_val);
- else if (op == TOK_RSHIFT || op == TOK_RSHIFT_ASSIGN)
- rez >>= numptr_val;
- else if (op == TOK_LSHIFT || op == TOK_LSHIFT_ASSIGN)
- rez <<= numptr_val;
- else if (op == TOK_GT)
- rez = (rez > numptr_val);
- else if (op == TOK_LT)
- rez = (rez < numptr_val);
- else if (op == TOK_LE)
- rez = (rez <= numptr_val);
- else if (op == TOK_MUL || op == TOK_MUL_ASSIGN)
- rez *= numptr_val;
- else if (op == TOK_ADD || op == TOK_PLUS_ASSIGN)
- rez += numptr_val;
- else if (op == TOK_SUB || op == TOK_MINUS_ASSIGN)
- rez -= numptr_val;
- else if (op == TOK_ASSIGN || op == TOK_COMMA)
- rez = numptr_val;
- else if (op == TOK_CONDITIONAL_SEP) {
- if (numptr_m1 == numstack) {
- /* protect $((expr : expr)) without "expr ? " */
- goto err;
- }
- numptr_m1->contidional_second_val_initialized = op;
- numptr_m1->contidional_second_val = numptr_val;
- } else if (op == TOK_CONDITIONAL) {
- rez = rez ?
- numptr_val : numptr_m1->contidional_second_val;
- } else if (op == TOK_EXPONENT) {
- if (numptr_val < 0)
- return -3; /* exponent less than 0 */
- else {
- arith_t c = 1;
-
- if (numptr_val)
- while (numptr_val--)
- c *= rez;
- rez = c;
- }
- } else if (numptr_val==0) /* zero divisor check */
- return -2;
- else if (op == TOK_DIV || op == TOK_DIV_ASSIGN)
- rez /= numptr_val;
- else if (op == TOK_REM || op == TOK_REM_ASSIGN)
- rez %= numptr_val;
- }
- if (tok_have_assign(op)) {
- char buf[sizeof(arith_t_type)*3 + 2];
-
- if (numptr_m1->var == NULL) {
- /* Hmm, 1=2 ? */
- goto err;
- }
- /* save to shell variable */
-#if ENABLE_ASH_MATH_SUPPORT_64
- snprintf(buf, sizeof(buf), "%lld", (arith_t_type) rez);
-#else
- snprintf(buf, sizeof(buf), "%ld", (arith_t_type) rez);
-#endif
- setvar(numptr_m1->var, buf, 0);
- /* after saving, make previous value for v++ or v-- */
- if (op == TOK_POST_INC)
- rez--;
- else if (op == TOK_POST_DEC)
- rez++;
- }
- numptr_m1->val = rez;
- /* protect geting var value, is number now */
- numptr_m1->var = NULL;
- return 0;
- err:
- return -1;
-}
-
-/* longest must be first */
-static const char op_tokens[] ALIGN1 = {
- '<','<','=',0, TOK_LSHIFT_ASSIGN,
- '>','>','=',0, TOK_RSHIFT_ASSIGN,
- '<','<', 0, TOK_LSHIFT,
- '>','>', 0, TOK_RSHIFT,
- '|','|', 0, TOK_OR,
- '&','&', 0, TOK_AND,
- '!','=', 0, TOK_NE,
- '<','=', 0, TOK_LE,
- '>','=', 0, TOK_GE,
- '=','=', 0, TOK_EQ,
- '|','=', 0, TOK_OR_ASSIGN,
- '&','=', 0, TOK_AND_ASSIGN,
- '*','=', 0, TOK_MUL_ASSIGN,
- '/','=', 0, TOK_DIV_ASSIGN,
- '%','=', 0, TOK_REM_ASSIGN,
- '+','=', 0, TOK_PLUS_ASSIGN,
- '-','=', 0, TOK_MINUS_ASSIGN,
- '-','-', 0, TOK_POST_DEC,
- '^','=', 0, TOK_XOR_ASSIGN,
- '+','+', 0, TOK_POST_INC,
- '*','*', 0, TOK_EXPONENT,
- '!', 0, TOK_NOT,
- '<', 0, TOK_LT,
- '>', 0, TOK_GT,
- '=', 0, TOK_ASSIGN,
- '|', 0, TOK_BOR,
- '&', 0, TOK_BAND,
- '*', 0, TOK_MUL,
- '/', 0, TOK_DIV,
- '%', 0, TOK_REM,
- '+', 0, TOK_ADD,
- '-', 0, TOK_SUB,
- '^', 0, TOK_BXOR,
- /* uniq */
- '~', 0, TOK_BNOT,
- ',', 0, TOK_COMMA,
- '?', 0, TOK_CONDITIONAL,
- ':', 0, TOK_CONDITIONAL_SEP,
- ')', 0, TOK_RPAREN,
- '(', 0, TOK_LPAREN,
- 0
-};
-/* ptr to ")" */
-#define endexpression &op_tokens[sizeof(op_tokens)-7]
-
-static arith_t
-arith(const char *expr, int *perrcode)
-{
- char arithval; /* Current character under analysis */
- operator lasttok, op;
- operator prec;
-
- const char *p = endexpression;
- int errcode;
-
- size_t datasizes = strlen(expr) + 2;
-
- /* Stack of integers */
- /* The proof that there can be no more than strlen(startbuf)/2+1 integers
- * in any given correct or incorrect expression is left as an exercise to
- * the reader. */
- v_n_t *numstack = alloca(((datasizes)/2)*sizeof(v_n_t)),
- *numstackptr = numstack;
- /* Stack of operator tokens */
- operator *stack = alloca((datasizes) * sizeof(operator)),
- *stackptr = stack;
-
- *stackptr++ = lasttok = TOK_LPAREN; /* start off with a left paren */
- *perrcode = errcode = 0;
-
- while (1) {
- arithval = *expr;
- if (arithval == 0) {
- if (p == endexpression) {
- /* Null expression. */
- return 0;
- }
-
- /* This is only reached after all tokens have been extracted from the
- * input stream. If there are still tokens on the operator stack, they
- * are to be applied in order. At the end, there should be a final
- * result on the integer stack */
-
- if (expr != endexpression + 1) {
- /* If we haven't done so already, */
- /* append a closing right paren */
- expr = endexpression;
- /* and let the loop process it. */
- continue;
- }
- /* At this point, we're done with the expression. */
- if (numstackptr != numstack+1) {
- /* ... but if there isn't, it's bad */
- err:
- return (*perrcode = -1);
- }
- if (numstack->var) {
- /* expression is $((var)) only, lookup now */
- errcode = arith_lookup_val(numstack);
- }
- ret:
- *perrcode = errcode;
- return numstack->val;
- }
-
- /* Continue processing the expression. */
- if (arith_isspace(arithval)) {
- /* Skip whitespace */
- goto prologue;
- }
- p = endofname(expr);
- if (p != expr) {
- size_t var_name_size = (p-expr) + 1; /* trailing zero */
-
- numstackptr->var = alloca(var_name_size);
- safe_strncpy(numstackptr->var, expr, var_name_size);
- expr = p;
- num:
- numstackptr->contidional_second_val_initialized = 0;
- numstackptr++;
- lasttok = TOK_NUM;
- continue;
- }
- if (isdigit(arithval)) {
- numstackptr->var = NULL;
-#if ENABLE_ASH_MATH_SUPPORT_64
- numstackptr->val = strtoll(expr, (char **) &expr, 0);
-#else
- numstackptr->val = strtol(expr, (char **) &expr, 0);
-#endif
- goto num;
- }
- for (p = op_tokens; ; p++) {
- const char *o;
-
- if (*p == 0) {
- /* strange operator not found */
- goto err;
- }
- for (o = expr; *p && *o == *p; p++)
- o++;
- if (! *p) {
- /* found */
- expr = o - 1;
- break;
- }
- /* skip tail uncompared token */
- while (*p)
- p++;
- /* skip zero delim */
- p++;
- }
- op = p[1];
-
- /* post grammar: a++ reduce to num */
- if (lasttok == TOK_POST_INC || lasttok == TOK_POST_DEC)
- lasttok = TOK_NUM;
-
- /* Plus and minus are binary (not unary) _only_ if the last
- * token was as number, or a right paren (which pretends to be
- * a number, since it evaluates to one). Think about it.
- * It makes sense. */
- if (lasttok != TOK_NUM) {
- switch (op) {
- case TOK_ADD:
- op = TOK_UPLUS;
- break;
- case TOK_SUB:
- op = TOK_UMINUS;
- break;
- case TOK_POST_INC:
- op = TOK_PRE_INC;
- break;
- case TOK_POST_DEC:
- op = TOK_PRE_DEC;
- break;
- }
- }
- /* We don't want a unary operator to cause recursive descent on the
- * stack, because there can be many in a row and it could cause an
- * operator to be evaluated before its argument is pushed onto the
- * integer stack. */
- /* But for binary operators, "apply" everything on the operator
- * stack until we find an operator with a lesser priority than the
- * one we have just extracted. */
- /* Left paren is given the lowest priority so it will never be
- * "applied" in this way.
- * if associativity is right and priority eq, applied also skip
- */
- prec = PREC(op);
- if ((prec > 0 && prec < UNARYPREC) || prec == SPEC_PREC) {
- /* not left paren or unary */
- if (lasttok != TOK_NUM) {
- /* binary op must be preceded by a num */
- goto err;
- }
- while (stackptr != stack) {
- if (op == TOK_RPAREN) {
- /* The algorithm employed here is simple: while we don't
- * hit an open paren nor the bottom of the stack, pop
- * tokens and apply them */
- if (stackptr[-1] == TOK_LPAREN) {
- --stackptr;
- /* Any operator directly after a */
- lasttok = TOK_NUM;
- /* close paren should consider itself binary */
- goto prologue;
- }
- } else {
- operator prev_prec = PREC(stackptr[-1]);
-
- convert_prec_is_assing(prec);
- convert_prec_is_assing(prev_prec);
- if (prev_prec < prec)
- break;
- /* check right assoc */
- if (prev_prec == prec && is_right_associativity(prec))
- break;
- }
- errcode = arith_apply(*--stackptr, numstack, &numstackptr);
- if (errcode) goto ret;
- }
- if (op == TOK_RPAREN) {
- goto err;
- }
- }
-
- /* Push this operator to the stack and remember it. */
- *stackptr++ = lasttok = op;
- prologue:
- ++expr;
- } /* while */
-}
-#endif /* ASH_MATH_SUPPORT */
-
-
/* ============ main() and helpers */
/*
* Called to exit the shell.
*/
-static void exitshell(void) ATTRIBUTE_NORETURN;
+static void exitshell(void) NORETURN;
static void
exitshell(void)
{
status = exitstatus;
TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
if (setjmp(loc.loc)) {
- if (exception == EXEXIT)
+ if (exception_type == EXEXIT)
/* dash bug: it just does _exit(exitstatus) here
* but we have to do setjobctl(0) first!
* (bug is still not fixed in dash-0.5.3 - if you run dash
init(void)
{
/* from input.c: */
- basepf.nextc = basepf.buf = basebuf;
+ basepf.next_to_pgetc = basepf.buf = basebuf;
/* from trap.c: */
signal(SIGCHLD, SIG_DFL);
* Process the shell command line arguments.
*/
static void
-procargs(int argc, char **argv)
+procargs(char **argv)
{
int i;
const char *xminusc;
xargv = argv;
arg0 = xargv[0];
- if (argc > 0)
+ /* if (xargv[0]) - mmm, this is always true! */
xargv++;
for (i = 0; i < NOPTS; i++)
optlist[i] = 2;
evalskip = 0;
loopnest = 0;
/* from input.c: */
- parselleft = parsenleft = 0; /* clear input buffer */
+ g_parsefile->left_in_buffer = 0;
+ g_parsefile->left_in_line = 0; /* clear input buffer */
popallfiles();
/* from parser.c: */
tokpushback = 0;
checkkwd = 0;
/* from redir.c: */
- clearredir(0);
+ clearredir(/*drop:*/ 0);
}
#if PROFILE
* is used to figure out how far we had gotten.
*/
int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int ash_main(int argc, char **argv)
+int ash_main(int argc UNUSED_PARAM, char **argv)
{
- char *shinit;
- volatile int state;
+ const char *shinit;
+ volatile smallint state;
struct jmploc jmploc;
struct stackmark smark;
#endif
state = 0;
if (setjmp(jmploc.loc)) {
- int e;
- int s;
+ smallint e;
+ smallint s;
reset();
- e = exception;
+ e = exception_type;
if (e == EXERROR)
exitstatus = 2;
s = state;
if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
exitshell();
-
- if (e == EXINT) {
+ if (e == EXINT)
outcslow('\n', stderr);
- }
+
popstackmark(&smark);
FORCE_INT_ON; /* enable interrupts */
if (s == 1)
exception_handler = &jmploc;
#if DEBUG
opentrace();
- trace_puts("Shell args: ");
+ TRACE(("Shell args: "));
trace_puts_args(argv);
#endif
rootpid = getpid();
#if ENABLE_ASH_RANDOM_SUPPORT
- rseed = rootpid + time(NULL);
+ /* Can use monotonic_ns() for better randomness but for now it is
+ * not used anywhere else in busybox... so avoid bloat */
+ random_galois_LFSR = random_LCG = rootpid + monotonic_us();
#endif
init();
setstackmark(&smark);
- procargs(argc, argv);
+ procargs(argv);
+
#if ENABLE_FEATURE_EDITING_SAVEHISTORY
if (iflag) {
const char *hp = lookupvar("HISTFILE");
}
}
#endif
- if (argv[0] && argv[0][0] == '-')
+ if (/* argv[0] && */ argv[0][0] == '-')
isloginsh = 1;
if (isloginsh) {
state = 1;
}
state3:
state = 4;
- if (minusc)
+ if (minusc) {
+ /* evalstring pushes parsefile stack.
+ * Ensure we don't falsely claim that 0 (stdin)
+ * is one of stacked source fds.
+ * Testcase: ash -c 'exec 1>&0' must not complain. */
+ if (!sflag)
+ g_parsefile->fd = -1;
evalstring(minusc, 0);
+ }
if (sflag || minusc == NULL) {
#if ENABLE_FEATURE_EDITING_SAVEHISTORY
- if ( iflag ) {
+ if (iflag) {
const char *hp = lookupvar("HISTFILE");
-
- if (hp != NULL)
+ if (hp)
line_input_state->hist_file = hp;
}
#endif
/* NOTREACHED */
}
-#if DEBUG
-const char *applet_name = "debug stuff usage";
-int main(int argc, char **argv)
-{
- return ash_main(argc, argv);
-}
-#endif
-
/*-
* Copyright (c) 1989, 1991, 1993, 1994
projects / oweals / busybox.git / blobdiff