*/
/*
- * 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 ENABLE_ASH_RANDOM_SUPPORT
+# include "random.h"
+#else
+# define CLEAR_RANDOM_T(rnd) ((void)0)
+#endif
+
+#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 */
+# 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[] = {
static const char homestr[] ALIGN1 = "HOME";
static const char snlfmt[] ALIGN1 = "%s\n";
-static const char illnum[] ALIGN1 = "Illegal number: %s";
+static const char msg_illnum[] ALIGN1 = "Illegal number: %s";
/*
* 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
struct jmploc *exception_handler;
-// disabled by vda: cannot understand how it was supposed to work -
-// cannot fix bugs. That's why you have to explain your non-trivial designs!
-// /* do we generate EXSIG events */
-// int exsig; /* counter */
- volatile int suppressint; /* counter */
- volatile /*sig_atomic_t*/ smallint intpending; /* 1 = got SIGINT */
+ volatile int suppress_int; /* counter */
+ volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
/* last pending signal */
- volatile /*sig_atomic_t*/ smallint pendingsig;
- smallint exception; /* kind of exception (0..5) */
+ volatile /*sig_atomic_t*/ smallint pending_sig;
+ smallint exception_type; /* kind of exception (0..5) */
/* exceptions */
#define EXINT 0 /* SIGINT received */
#define EXERROR 1 /* a generic error */
/*
* 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]; /* offset by 1: "signal" 0 is meaningless */
+ uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
char *trap[NSIG];
+ char **trap_ptr; /* used only by "trap hack" */
/* 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) */
+ random_t random_gen;
#endif
pid_t backgndpid; /* pid of last background process */
smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
#define physdir (G_misc.physdir )
#define arg0 (G_misc.arg0 )
#define exception_handler (G_misc.exception_handler)
-#define exception (G_misc.exception )
-#define suppressint (G_misc.suppressint )
-#define intpending (G_misc.intpending )
-//#define exsig (G_misc.exsig )
-#define pendingsig (G_misc.pendingsig )
+#define exception_type (G_misc.exception_type )
+#define suppress_int (G_misc.suppress_int )
+#define pending_int (G_misc.pending_int )
+#define pending_sig (G_misc.pending_sig )
#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 trap_ptr (G_misc.trap_ptr )
+#define random_gen (G_misc.random_gen )
#define backgndpid (G_misc.backgndpid )
#define job_warning (G_misc.job_warning)
#define INIT_G_misc() do { \
barrier(); \
curdir = nullstr; \
physdir = nullstr; \
+ trap_ptr = trap; \
+} while (0)
+
+
+/* ============ 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(0x%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 says: "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 */
* more fun than worrying about efficiency and portability. :-))
*/
#define INT_OFF do { \
- suppressint++; \
+ suppress_int++; \
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) NORETURN;
static void
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
static void
raise_interrupt(void)
{
- int i;
+ int ex_type;
- intpending = 0;
+ pending_int = 0;
/* Signal is not automatically unmasked after it is raised,
* do it ourself - unmask all signals */
sigprocmask_allsigs(SIG_UNBLOCK);
- /* pendingsig = 0; - now done in onsig() */
+ /* pending_sig = 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)
{
- if (--suppressint == 0 && intpending) {
+ xbarrier();
+ if (--suppress_int == 0 && pending_int) {
raise_interrupt();
}
}
#define INT_ON int_on()
-static void
+static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
force_int_on(void)
{
- suppressint = 0;
- if (intpending)
+ xbarrier();
+ suppress_int = 0;
+ if (pending_int)
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 SAVE_INT(v) ((v) = suppress_int)
#define RESTORE_INT(v) do { \
xbarrier(); \
- suppressint = (v); \
- if (suppressint == 0 && intpending) \
+ suppress_int = (v); \
+ if (suppress_int == 0 && pending_int) \
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;
- }
-}
-
/* ============ Stdout/stderr output */
/* ============ Parser structures */
/* control characters in argument strings */
-#define CTLESC '\201' /* escape next character */
-#define CTLVAR '\202' /* variable defn */
-#define CTLENDVAR '\203'
-#define CTLBACKQ '\204'
+#define CTLESC ((unsigned char)'\201') /* escape next character */
+#define CTLVAR ((unsigned char)'\202') /* variable defn */
+#define CTLENDVAR ((unsigned char)'\203')
+#define CTLBACKQ ((unsigned char)'\204')
#define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
/* CTLBACKQ | CTLQUOTE == '\205' */
-#define CTLARI '\206' /* arithmetic expression */
-#define CTLENDARI '\207'
-#define CTLQUOTEMARK '\210'
+#define CTLARI ((unsigned char)'\206') /* arithmetic expression */
+#define CTLENDARI ((unsigned char)'\207')
+#define CTLQUOTEMARK ((unsigned char)'\210')
/* variable substitution byte (follows CTLVAR) */
#define VSTYPE 0x0f /* type of variable substitution */
#define NHERE 24
#define NXHERE 25
#define NNOT 26
+#define N_NUMBER 27
union node;
struct nnot nnot;
};
+/*
+ * NODE_EOF is returned by parsecmd when it encounters an end of file.
+ * It must be distinct from NULL.
+ */
+#define NODE_EOF ((union node *) -1L)
+
struct nodelist {
struct nodelist *next;
union node *n;
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) ", pending_sig, pending_int, suppress_int);
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) ", pending_sig, pending_int, suppress_int);
vfprintf(tracefile, fmt, va);
}
return;
indent(ind, pfx, fp);
+
+ if (n == NODE_EOF) {
+ fputs("<EOF>", fp);
+ return;
+ }
+
switch (n->type) {
case NSEMI:
s = "; ";
break;
case NPIPE:
for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
- shcmd(lp->n, fp);
+ shtree(lp->n, 0, NULL, fp);
if (lp->next)
fputs(" | ", fp);
}
showtree(union node *n)
{
trace_puts("showtree called\n");
- shtree(n, 1, NULL, stdout);
+ shtree(n, 1, NULL, stderr);
}
-#define TRACE(param) trace_printf param
-#define TRACEV(param) trace_vprintf param
-
-#else
-
-#define TRACE(param)
-#define TRACEV(param)
-
#endif /* DEBUG */
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 */
va_end(ap);
}
+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, ...)
/* ============ Memory allocation */
+#if 0
+/* I consider these wrappers nearly useless:
+ * ok, they return you to nearest exception handler, but
+ * how much memory do you leak in the process, making
+ * memory starvation worse?
+ */
+static void *
+ckrealloc(void * p, size_t nbytes)
+{
+ p = realloc(p, nbytes);
+ if (!p)
+ ash_msg_and_raise_error(bb_msg_memory_exhausted);
+ return p;
+}
+
+static void *
+ckmalloc(size_t nbytes)
+{
+ return ckrealloc(NULL, nbytes);
+}
+
+static void *
+ckzalloc(size_t nbytes)
+{
+ return memset(ckmalloc(nbytes), 0, nbytes);
+}
+
+static char *
+ckstrdup(const char *s)
+{
+ char *p = strdup(s);
+ if (!p)
+ ash_msg_and_raise_error(bb_msg_memory_exhausted);
+ return p;
+}
+#else
+/* Using bbox equivalents. They exit if out of memory */
+# define ckrealloc xrealloc
+# define ckmalloc xmalloc
+# define ckzalloc xzalloc
+# define ckstrdup xstrdup
+#endif
+
/*
* It appears that grabstackstr() will barf with such alignments
* because stalloc() will return a string allocated in a new stackblock.
/* Most machines require the value returned from malloc to be aligned
* in some way. The following macro will get this right
* on many machines. */
- SHELL_SIZE = sizeof(union {int i; char *cp; double d; }) - 1,
+ SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
/* Minimum size of a block */
MINSIZE = SHELL_ALIGN(504),
};
herefd = -1; \
} while (0)
+
#define stackblock() ((void *)g_stacknxt)
#define stackblocksize() g_stacknleft
-
-static void *
-ckrealloc(void * p, size_t nbytes)
-{
- p = realloc(p, nbytes);
- if (!p)
- ash_msg_and_raise_error(bb_msg_memory_exhausted);
- return p;
-}
-
-static void *
-ckmalloc(size_t nbytes)
-{
- return ckrealloc(NULL, nbytes);
-}
-
-static void *
-ckzalloc(size_t nbytes)
-{
- return memset(ckmalloc(nbytes), 0, nbytes);
-}
-
-/*
- * Make a copy of a string in safe storage.
- */
-static char *
-ckstrdup(const char *s)
-{
- char *p = strdup(s);
- if (!p)
- ash_msg_and_raise_error(bb_msg_memory_exhausted);
- return p;
-}
-
/*
* Parse trees for commands are allocated in lifo order, so we use a stack
* to make this more efficient, and also to avoid all sorts of exception
number(const char *s)
{
if (!is_number(s))
- ash_msg_and_raise_error(illnum, s);
+ ash_msg_and_raise_error(msg_illnum, s);
return atoi(s);
}
}
#if ENABLE_ASH_GETOPTS
-static void getoptsreset(const char *value);
+static void FAST_FUNC getoptsreset(const char *value);
#endif
struct var {
struct var *next; /* next entry in hash list */
int flags; /* flags are defined above */
const char *text; /* name=value */
- void (*func)(const char *); /* function to be called when */
+ void (*func)(const char *) FAST_FUNC; /* function to be called when */
/* the variable gets set/unset */
};
/* Need to be before varinit_data[] */
#if ENABLE_LOCALE_SUPPORT
-static void
+static void FAST_FUNC
change_lc_all(const char *value)
{
if (value && *value != '\0')
setlocale(LC_ALL, value);
}
-static void
+static void FAST_FUNC
change_lc_ctype(const char *value)
{
if (value && *value != '\0')
#endif
#if ENABLE_ASH_MAIL
static void chkmail(void);
-static void changemail(const char *);
+static void changemail(const char *) FAST_FUNC;
#endif
-static void changepath(const char *);
+static void changepath(const char *) FAST_FUNC;
#if ENABLE_ASH_RANDOM_SUPPORT
-static void change_random(const char *);
+static void change_random(const char *) FAST_FUNC;
#endif
static const struct {
int flags;
const char *text;
- void (*func)(const char *);
+ void (*func)(const char *) FAST_FUNC;
} varinit_data[] = {
#ifdef IFS_BROKEN
{ VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
#define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
#if ENABLE_ASH_GETOPTS
-static void
+static void FAST_FUNC
getoptsreset(const char *value)
{
shellparam.optind = number(value);
/*
* Find the value of a variable. Returns NULL if not set.
*/
-static char *
+static const char *
lookupvar(const char *name)
{
struct var *v;
/*
* Search the environment of a builtin command.
*/
-static char *
+static const char *
bltinlookup(const char *name)
{
struct strlist *sp;
/* ============ Path search helper
*
* The variable path (passed by reference) should be set to the start
- * of the path before the first call; padvance will update
- * this value as it proceeds. Successive calls to padvance will return
+ * of the path before the first call; path_advance will update
+ * this value as it proceeds. Successive calls to path_advance will return
* the possible path expansions in sequence. If an option (indicated by
* a percent sign) appears in the path entry then the global variable
* pathopt will be set to point to it; otherwise pathopt will be set to
* NULL.
*/
-static const char *pathopt; /* set by padvance */
+static const char *pathopt; /* set by path_advance */
static char *
-padvance(const char **path, const char *name)
+path_advance(const char **path, const char *name)
{
const char *p;
char *q;
#define CD_PHYSICAL 1
#define CD_PRINT 2
-static int docd(const char *, int);
-
static int
cdopt(void)
{
int i, j;
j = 'L';
- while ((i = nextopt("LP"))) {
+ while ((i = nextopt("LP")) != '\0') {
if (i != j) {
flags ^= CD_PHYSICAL;
j = i;
return err;
}
-static int
+static int FAST_FUNC
cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
const char *dest;
}
do {
c = *path;
- p = padvance(&path, dest);
+ p = path_advance(&path, dest);
if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
if (c && c != ':')
flags |= CD_PRINT;
return 0;
}
-static int
+static int FAST_FUNC
pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
int flags;
/* ============ ... */
+
#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 {
+ {
+ if ((unsigned char)c >= CTLESC
+ && (unsigned char)c <= CTLQUOTEMARK
+ ) {
+ return CCTL;
+ }
s = strchrnul(spec_symbls, c);
- if (*s == '\0')
+ if (*s == '\0') {
return CWORD;
+ }
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
+static int FAST_FUNC
aliascmd(int argc UNUSED_PARAM, char **argv)
{
char *n, *v;
return ret;
}
-static int
+static int FAST_FUNC
unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
int i;
#define FORK_NOJOB 2
/* mode flags for showjob(s) */
-#define SHOW_PGID 0x01 /* only show pgid - for jobs -p */
-#define SHOW_PID 0x04 /* include process pid */
-#define SHOW_CHANGED 0x08 /* only jobs whose state has changed */
+#define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
+#define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
+#define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
/*
* A job structure contains information about a job. A job is either a
* latter case, pidlist will be non-NULL, and will point to a -1 terminated
* array of pids.
*/
-
struct procstat {
pid_t pid; /* process id */
int status; /* last process status from wait() */
};
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 *);
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 (signo == SIGINT && !trap[SIGINT]) {
+ if (!suppress_int) {
+ pending_sig = 0;
+ raise_interrupt(); /* does not return */
+ }
+ pending_int = 1;
+ } else {
+ pending_sig = 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 */
{
struct job *jp;
struct job *found;
- const char *err_msg = "No such job: %s";
+ const char *err_msg = "%s: no such job";
unsigned num;
int c;
const char *p;
}
if (is_number(p)) {
-// TODO: number() instead? It does error checking...
num = atoi(p);
if (num < njobs) {
jp = jobtab + num - 1;
p++;
}
- found = 0;
- while (1) {
- if (!jp)
- goto err;
+ found = NULL;
+ while (jp) {
if (match(jp->ps[0].cmd, p)) {
if (found)
goto err;
}
jp = jp->prev_job;
}
+ if (!found)
+ goto err;
+ jp = found;
gotit:
#if JOBS
doing_jobctl = on;
}
-static int
+static int FAST_FUNC
killcmd(int argc, char **argv)
{
int i = 1;
return status;
}
-static int
+static int FAST_FUNC
fg_bgcmd(int argc UNUSED_PARAM, char **argv)
{
struct job *jp;
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 (doing_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 && pending_sig)
+ raise_exception(EXSIG);
+ return pid;
+}
+
#if JOBS
static void
showjob(FILE *out, struct job *jp, int mode)
ps = jp->ps;
- if (mode & SHOW_PGID) {
+ if (mode & SHOW_ONLY_PGID) { /* jobs -p */
/* just output process (group) id of pipeline */
fprintf(out, "%d\n", ps->pid);
return;
indent_col = col;
if (jp == curjob)
- s[col - 2] = '+';
+ s[col - 3] = '+';
else if (curjob && jp == curjob->prev_job)
- s[col - 2] = '-';
+ s[col - 3] = '-';
- if (mode & SHOW_PID)
+ if (mode & SHOW_PIDS)
col += fmtstr(s + col, 16, "%d ", ps->pid);
psend = ps + jp->nprocs;
status = jp->stopstatus;
col += sprint_status(s + col, status, 0);
}
+ /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
+ /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
+ * or prints several "PID | <cmdN>" lines,
+ * depending on SHOW_PIDS bit.
+ * We do not print status of individual processes
+ * between PID and <cmdN>. bash does it, but not very well:
+ * first line shows overall job status, not process status,
+ * making it impossible to know 1st process status.
+ */
goto start;
-
- do {
+ while (1) {
/* for each process */
- col = fmtstr(s, 48, " |\n%*c%d ", indent_col, ' ', ps->pid) - 3;
+ s[0] = '\0';
+ col = 33;
+ if (mode & SHOW_PIDS)
+ col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->pid) - 1;
start:
- fprintf(out, "%s%*c%s",
- s, 33 - col >= 0 ? 33 - col : 0, ' ', ps->cmd
- );
- if (!(mode & SHOW_PID)) {
- showpipe(jp, out);
+ fprintf(out, "%s%*c", s, 33 - col >= 0 ? 33 - col : 0, ' ');
+ if (ps != jp->ps)
+ fprintf(out, "| ");
+ fprintf(out, "%s", ps->cmd);
+ if (++ps == psend)
break;
- }
- if (++ps == psend) {
- outcslow('\n', out);
- break;
- }
- } while (1);
+ }
+ outcslow('\n', out);
jp->changed = 0;
{
struct job *jp;
- TRACE(("showjobs(%x) called\n", mode));
+ TRACE(("showjobs(0x%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
+static int FAST_FUNC
jobscmd(int argc UNUSED_PARAM, char **argv)
{
int mode, m;
mode = 0;
- while ((m = nextopt("lp"))) {
+ while ((m = nextopt("lp")) != '\0') {
if (m == 'l')
- mode = SHOW_PID;
+ mode |= SHOW_PIDS;
else
- mode = SHOW_PGID;
+ mode |= SHOW_ONLY_PGID;
}
argv = argptr;
if (*argv) {
do
- showjob(stdout, getjob(*argv,0), mode);
+ showjob(stdout, getjob(*argv, 0), mode);
while (*++argv);
} else
showjobs(stdout, mode);
}
retval += 128;
}
- TRACE(("getstatus: job %d, nproc %d, status %x, retval %x\n",
+ TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
jobno(job), job->nprocs, status, retval));
return retval;
}
-static int
+static int FAST_FUNC
waitcmd(int argc UNUSED_PARAM, char **argv)
{
struct job *job;
int retval;
struct job *jp;
-// exsig++;
-// xbarrier();
- if (pendingsig)
+ if (pending_sig)
raise_exception(EXSIG);
nextopt(nullstr);
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:
static const char vstype[VSTYPE + 1][3] = {
"", "}", "-", "+", "?", "=",
"%", "%%", "#", "##"
- USE_ASH_BASH_COMPAT(, ":", "/", "//")
+ IF_ASH_BASH_COMPAT(, ":", "/", "//")
};
const char *p, *str;
case CTLBACKQ+CTLQUOTE:
str = "\"$(...)\"";
goto dostr;
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
case CTLARI:
str = "$((";
goto dostr;
if (!str)
continue;
dostr:
- while ((c = *str++)) {
+ while ((c = *str++) != '\0') {
USTPUTC(c, nextc);
}
}
cmdputs("if ");
cmdtxt(n->nif.test);
cmdputs("; then ");
- n = n->nif.ifpart;
if (n->nif.elsepart) {
- cmdtxt(n);
+ cmdtxt(n->nif.ifpart);
cmdputs("; else ");
n = n->nif.elsepart;
+ } else {
+ n = n->nif.ifpart;
}
p = "; fi";
goto dotail;
for (tp = trap; tp < &trap[NSIG]; tp++) {
if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
INT_OFF;
- free(*tp);
+ if (trap_ptr == trap)
+ free(*tp);
+ /* else: it "belongs" to trap_ptr vector, don't free */
*tp = NULL;
- if (tp != &trap[0])
+ if ((tp - trap) != 0)
setsignal(tp - trap);
INT_ON;
}
static void closescript(void);
/* Called after fork(), in child */
-static void
-forkchild(struct job *jp, /*union node *n,*/ int mode)
+static NOINLINE void
+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();
+
+ if (mode == FORK_NOJOB /* is it `xxx` ? */
+ && n && n->type == NCMD /* is it single cmd? */
+ /* && n->ncmd.args->type == NARG - always true? */
+ && strcmp(n->ncmd.args->narg.text, "trap") == 0
+ && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
+ /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
+ ) {
+ TRACE(("Trap hack\n"));
+ /* Awful hack for `trap` or $(trap).
+ *
+ * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
+ * contains an example where "trap" is executed in a subshell:
+ *
+ * save_traps=$(trap)
+ * ...
+ * eval "$save_traps"
+ *
+ * Standard does not say that "trap" in subshell shall print
+ * parent shell's traps. It only says that its output
+ * must have suitable form, but then, in the above example
+ * (which is not supposed to be normative), it implies that.
+ *
+ * bash (and probably other shell) does implement it
+ * (traps are reset to defaults, but "trap" still shows them),
+ * but as a result, "trap" logic is hopelessly messed up:
+ *
+ * # trap
+ * trap -- 'echo Ho' SIGWINCH <--- we have a handler
+ * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
+ * # true | trap <--- trap is in subshell - no output (ditto)
+ * # echo `true | trap` <--- in subshell - output (but traps are reset!)
+ * trap -- 'echo Ho' SIGWINCH
+ * # echo `(trap)` <--- in subshell in subshell - output
+ * trap -- 'echo Ho' SIGWINCH
+ * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
+ * trap -- 'echo Ho' SIGWINCH
+ *
+ * The rules when to forget and when to not forget traps
+ * get really complex and nonsensical.
+ *
+ * Our solution: ONLY bare $(trap) or `trap` is special.
+ */
+ /* Save trap handler strings for trap builtin to print */
+ trap_ptr = memcpy(xmalloc(sizeof(trap)), trap, sizeof(trap));
+ /* Fall through into clearing traps */
+ }
clear_traps();
#if JOBS
/* do job control only in root shell */
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);
}
+#if JOBS
+ if (n && n->type == NCMD
+ && strcmp(n->ncmd.args->narg.text, "jobs") == 0
+ ) {
+ TRACE(("Job hack\n"));
+ /* "jobs": we do not want to clear job list for it,
+ * instead we remove only _its_ own_ job from job list.
+ * This makes "jobs .... | cat" more useful.
+ */
+ freejob(curjob);
+ return;
+ }
+#endif
for (jp = curjob; jp; jp = jp->prev_job)
freejob(jp);
jobless = 0;
freejob(jp);
ash_msg_and_raise_error("can't fork");
}
- if (pid == 0)
- forkchild(jp, /*n,*/ mode);
- else
+ if (pid == 0) {
+ CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
+ 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) {
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);
struct redirtab *next;
int nullredirs;
int pair_count;
- struct two_fd_t two_fd[0];
+ struct two_fd_t two_fd[];
};
#define redirlist (G_var.redirlist)
if (newfd < 0) {
/* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
if (redir->ndup.dupfd < 0) { /* "fd>&-" */
- close(fd);
+ /* Don't want to trigger debugging */
+ if (fd != -1)
+ close(fd);
} else {
copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
}
/*close(fd);*/
copyfd(copy, fd | COPYFD_EXACT);
}
- close(copy);
+ close(copy & ~COPYFD_RESTORE);
}
}
redirlist = rp->next;
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_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_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;
-#if ENABLE_ASH_MATH_SUPPORT
-static arith_t dash_arith(const char *);
-static arith_t arith(const char *expr, int *perrcode);
+ return result;
+}
#endif
/*
#define EXP_WORD 0x80 /* expand word in parameter expansion */
#define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
/*
- * _rmescape() flags
+ * rmescape() flags
*/
#define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
#define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
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;
}
{
size_t esc = 0;
- while (p > start && *--p == CTLESC) {
+ while (p > start && (unsigned char)*--p == CTLESC) {
esc++;
}
return esc;
* Remove any CTLESC characters from a string.
*/
static char *
-_rmescapes(char *str, int flag)
+rmescapes(char *str, int flag)
{
static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' };
char *p, *q, *r;
unsigned inquotes;
- int notescaped;
- int globbing;
+ unsigned protect_against_glob;
+ unsigned globbing;
p = strpbrk(str, qchars);
- if (!p) {
+ if (!p)
return str;
- }
+
q = p;
r = str;
if (flag & RMESCAPE_ALLOC) {
q = (char *)memcpy(q, str, len) + len;
}
}
+
inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
globbing = flag & RMESCAPE_GLOB;
- notescaped = globbing;
+ protect_against_glob = globbing;
while (*p) {
if (*p == CTLQUOTEMARK) {
+// TODO: if no RMESCAPE_QUOTED in flags, inquotes never becomes 0
+// (alternates between RMESCAPE_QUOTED and ~RMESCAPE_QUOTED). Is it ok?
+// Note: both inquotes and protect_against_glob only affect whether
+// CTLESC,<ch> gets converted to <ch> or to \<ch>
inquotes = ~inquotes;
p++;
- notescaped = globbing;
+ protect_against_glob = globbing;
continue;
}
if (*p == '\\') {
/* naked back slash */
- notescaped = 0;
+ protect_against_glob = 0;
goto copy;
}
if (*p == CTLESC) {
p++;
- if (notescaped && inquotes && *p != '/') {
+ if (protect_against_glob && inquotes && *p != '/') {
*q++ = '\\';
}
}
- notescaped = globbing;
+ protect_against_glob = globbing;
copy:
*q++ = *p++;
}
}
return r;
}
-#define rmescapes(p) _rmescapes((p), 0)
-
#define pmatch(a, b) !fnmatch((a), (b), 0)
/*
if (quoted) {
flag |= RMESCAPE_QUOTED;
}
- return _rmescapes((char *)pattern, flag);
+ return rmescapes((char *)pattern, flag);
}
/*
{
char *q = expdest;
- q = makestrspace(len * 2, q);
+ q = makestrspace(quotes ? len * 2 : len, q);
while (len--) {
int c = signed_char2int(*p++);
if (!c)
continue;
- if (quotes && (SIT(c, syntax) == CCTL || SIT(c, syntax) == CBACK))
- USTPUTC(CTLESC, q);
+ if (quotes) {
+ int n = SIT(c, syntax);
+ if (n == CCTL || n == CBACK)
+ USTPUTC(CTLESC, q);
+ }
USTPUTC(c, q);
}
}
static char *
-exptilde(char *startp, char *p, int flag)
+exptilde(char *startp, char *p, int flags)
{
char c;
char *name;
struct passwd *pw;
const char *home;
- int quotes = flag & (EXP_FULL | EXP_CASE);
+ int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
int startloc;
name = p + 1;
case CTLQUOTEMARK:
return startp;
case ':':
- if (flag & EXP_VARTILDE)
+ if (flags & EXP_VARTILDE)
goto done;
break;
case '/':
#define EV_EXIT 01 /* exit after evaluating tree */
static void evaltree(union node *, int);
-static void
+static void FAST_FUNC
evalbackcmd(union node *n, struct backcmd *result)
{
int saveherefd;
result->buf = NULL;
result->nleft = 0;
result->jp = NULL;
- if (n == NULL) {
+ if (n == NULL)
goto out;
- }
saveherefd = herefd;
herefd = -1;
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
expdest = p;
if (quotes)
- rmescapes(p + 2);
+ rmescapes(p + 2, 0);
- len = cvtnum(dash_arith(p + 2));
+ len = cvtnum(ash_arith(p + 2));
if (flag != '"')
recordregion(begoff, begoff + len, 0);
#endif
/* argstr needs it */
-static char *evalvar(char *p, int flag, struct strlist *var_str_list);
+static char *evalvar(char *p, int flags, struct strlist *var_str_list);
/*
* Perform variable and command substitution. If EXP_FULL is set, output CTLESC
* for correct expansion of "B=$A" word.
*/
static void
-argstr(char *p, int flag, struct strlist *var_str_list)
+argstr(char *p, int flags, struct strlist *var_str_list)
{
static const char spclchars[] ALIGN1 = {
'=',
CTLVAR,
CTLBACKQ,
CTLBACKQ | CTLQUOTE,
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
CTLENDARI,
#endif
0
};
const char *reject = spclchars;
int c;
- int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
- int breakall = flag & EXP_WORD;
+ int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */
+ int breakall = flags & EXP_WORD;
int inquotes;
size_t length;
int startloc;
- if (!(flag & EXP_VARTILDE)) {
+ if (!(flags & EXP_VARTILDE)) {
reject += 2;
- } else if (flag & EXP_VARTILDE2) {
+ } else if (flags & EXP_VARTILDE2) {
reject++;
}
inquotes = 0;
length = 0;
- if (flag & EXP_TILDE) {
+ if (flags & EXP_TILDE) {
char *q;
- flag &= ~EXP_TILDE;
+ flags &= ~EXP_TILDE;
tilde:
q = p;
- if (*q == CTLESC && (flag & EXP_QWORD))
+ if (*q == CTLESC && (flags & EXP_QWORD))
q++;
if (*q == '~')
- p = exptilde(p, q, flag);
+ p = exptilde(p, q, flags);
}
start:
startloc = expdest - (char *)stackblock();
for (;;) {
length += strcspn(p + length, reject);
- c = p[length];
- if (c && (!(c & 0x80)
-#if ENABLE_ASH_MATH_SUPPORT
- || c == CTLENDARI
+ c = (unsigned char) p[length];
+ if (c) {
+ if (!(c & 0x80)
+#if ENABLE_SH_MATH_SUPPORT
+ || c == CTLENDARI
#endif
- )) {
- /* c == '=' || c == ':' || c == CTLENDARI */
- length++;
+ ) {
+ /* c == '=' || c == ':' || c == CTLENDARI */
+ length++;
+ }
}
if (length > 0) {
int newloc;
case '\0':
goto breakloop;
case '=':
- if (flag & EXP_VARTILDE2) {
+ if (flags & EXP_VARTILDE2) {
p--;
continue;
}
- flag |= EXP_VARTILDE2;
+ flags |= EXP_VARTILDE2;
reject++;
/* fall through */
case ':':
goto breakloop;
case CTLQUOTEMARK:
/* "$@" syntax adherence hack */
- if (
- !inquotes &&
- !memcmp(p, dolatstr, 4) &&
- (p[4] == CTLQUOTEMARK || (
- p[4] == CTLENDVAR &&
- p[5] == CTLQUOTEMARK
- ))
+ if (!inquotes
+ && memcmp(p, dolatstr, 4) == 0
+ && ( p[4] == CTLQUOTEMARK
+ || (p[4] == CTLENDVAR && p[5] == CTLQUOTEMARK)
+ )
) {
- p = evalvar(p + 1, flag, /* var_str_list: */ NULL) + 1;
+ p = evalvar(p + 1, flags, /* var_str_list: */ NULL) + 1;
goto start;
}
inquotes = !inquotes;
length++;
goto addquote;
case CTLVAR:
- p = evalvar(p, flag, var_str_list);
+ p = evalvar(p, flags, var_str_list);
goto start;
case CTLBACKQ:
- c = 0;
+ c = '\0';
case CTLBACKQ|CTLQUOTE:
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);
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);
}
char *startp;
char *loc;
char *rmesc, *rmescend;
- USE_ASH_BASH_COMPAT(char *repl = NULL;)
- USE_ASH_BASH_COMPAT(char null = '\0';)
- USE_ASH_BASH_COMPAT(int pos, len, orig_len;)
+ 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;
#if ENABLE_ASH_BASH_COMPAT
case VSSUBSTR:
loc = str = stackblock() + strloc;
-// TODO: number() instead? It does error checking...
- pos = atoi(loc);
+ /* Read POS in ${var:POS:LEN} */
+ pos = atoi(loc); /* number(loc) errors out on "1:4" */
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. */
+ /* Adjust the length by the number of escapes */
for (ptr = startp; ptr < (str - 1); ptr++) {
if (*ptr == CTLESC) {
len--;
orig_len = len;
if (*loc++ == ':') {
-// TODO: number() instead? It does error checking...
- len = atoi(loc);
+ /* ${var::LEN} */
+ len = number(loc);
} else {
+ /* Skip POS in ${var:POS:LEN} */
len = orig_len;
- while (*loc && *loc != ':')
+ while (*loc && *loc != ':') {
+ /* TODO?
+ * bash complains on: var=qwe; echo ${var:1a:123}
+ if (!isdigit(*loc))
+ ash_msg_and_raise_error(msg_illnum, str);
+ */
loc++;
- if (*loc++ == ':')
-// TODO: number() instead? It does error checking...
- len = atoi(loc);
+ }
+ if (*loc++ == ':') {
+ len = number(loc);
+ }
}
if (pos >= orig_len) {
pos = 0;
* stack will need rebasing, and we'll need to remove our work
* areas each time
*/
- USE_ASH_BASH_COMPAT(restart:)
+ IF_ASH_BASH_COMPAT(restart:)
amount = expdest - ((char *)stackblock() + resetloc);
STADJUST(-amount, expdest);
rmesc = startp;
rmescend = (char *)stackblock() + strloc;
if (quotes) {
- rmesc = _rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
+ rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
if (rmesc != startp) {
rmescend = expdest;
startp = (char *)stackblock() + startloc;
idx++;
rmesc++;
}
- } else
+ } else {
idx = loc;
+ }
for (loc = repl; *loc; loc++) {
restart_detect = stackblock();
/*
* Add the value of a specialized variable to the stack string.
- */
-static ssize_t
+ * name parameter (examples):
+ * ash -c 'echo $1' name:'1='
+ * ash -c 'echo $qwe' name:'qwe='
+ * ash -c 'echo $$' name:'$='
+ * ash -c 'echo ${$}' name:'$='
+ * ash -c 'echo ${$##q}' name:'$=q'
+ * ash -c 'echo ${#$}' name:'$='
+ * note: examples with bad shell syntax:
+ * ash -c 'echo ${#$1}' name:'$=1'
+ * ash -c 'echo ${#1#}' name:'1=#'
+ */
+static NOINLINE ssize_t
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;
int syntax;
int quoted = varflags & VSQUOTE;
int subtype = varflags & VSTYPE;
- int quotes = flags & (EXP_FULL | EXP_CASE);
+ int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
if (quoted && (flags & EXP_FULL))
sep = 1 << CHAR_BIT;
return -1;
numvar:
len = cvtnum(num);
- break;
+ goto check_1char_name;
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;
+ check_1char_name:
+#if 0
+ /* handles cases similar to ${#$1} */
+ if (name[2] != '\0')
+ raise_error_syntax("bad substitution");
+#endif
break;
case '@':
if (sep)
ap = shellparam.p;
if (!ap)
return -1;
- while ((p = *ap++)) {
+ while ((p = *ap++) != NULL) {
size_t partlen;
partlen = strlen(p);
case '7':
case '8':
case '9':
-// TODO: number() instead? It does error checking...
- num = atoi(name);
+ num = atoi(name); /* number(name) fails on ${N#str} etc */
if (num < 0 || num > shellparam.nparam)
return -1;
p = num ? shellparam.p[num - 1] : arg0;
* input string.
*/
static char *
-evalvar(char *p, int flag, struct strlist *var_str_list)
+evalvar(char *p, int flags, struct strlist *var_str_list)
{
char varflags;
char subtype;
int startloc;
ssize_t varlen;
- varflags = *p++;
+ varflags = (unsigned char) *p++;
subtype = varflags & VSTYPE;
quoted = varflags & VSQUOTE;
var = p;
p = strchr(p, '=') + 1;
again:
- varlen = varvalue(var, varflags, flag, var_str_list);
+ varlen = varvalue(var, varflags, flags, var_str_list);
if (varflags & VSNUL)
varlen--;
vsplus:
if (varlen < 0) {
argstr(
- p, flag | EXP_TILDE |
- (quoted ? EXP_QWORD : EXP_WORD),
+ p, flags | EXP_TILDE |
+ (quoted ? EXP_QWORD : EXP_WORD),
var_str_list
);
goto end;
patloc = expdest - (char *)stackblock();
if (0 == subevalvar(p, /* str: */ NULL, patloc, subtype,
startloc, varflags,
- /* quotes: */ flag & (EXP_FULL | EXP_CASE),
+//TODO: | EXP_REDIR too? All other such places do it too
+ /* quotes: */ flags & (EXP_FULL | EXP_CASE),
var_str_list)
) {
int amount = expdest - (
p++;
if (*p == '.')
matchdot++;
- while (!intpending && (dp = readdir(dirp)) != NULL) {
+ while (!pending_int && (dp = readdir(dirp)) != NULL) {
if (dp->d_name[0] == '.' && !matchdot)
continue;
if (pmatch(start, dp->d_name)) {
*/
nometa:
*exparg.lastp = str;
- rmescapes(str->text);
+ rmescapes(str->text, 0);
exparg.lastp = &str->next;
} else {
*exparg.lastp = NULL;
expandmeta(exparg.list /*, flag*/);
} else {
if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
- rmescapes(p);
+ rmescapes(p, 0);
sp = stzalloc(sizeof(*sp));
sp->text = p;
*exparg.lastp = sp;
struct builtincmd {
const char *name;
- int (*builtin)(int, char **);
+ int (*builtin)(int, char **) FAST_FUNC;
/* unsigned flags; */
};
#define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
static void
-tryexec(USE_FEATURE_SH_STANDALONE(int applet_no,) 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 (applet_no >= 0) {
- if (APPLET_IS_NOEXEC(applet_no))
+ 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
|| (applet_no = find_applet_by_name(argv[0])) >= 0
#endif
) {
- tryexec(USE_FEATURE_SH_STANDALONE(applet_no,) 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) {
+ while ((cmdname = path_advance(&path, argv[0])) != NULL) {
if (--idx < 0 && pathopt == NULL) {
- tryexec(USE_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
+ tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
if (errno != ENOENT && errno != ENOTDIR)
e = errno;
}
break;
}
exitstatus = exerrno;
- TRACE(("shellexec failed for %s, errno %d, suppressint %d\n",
- argv[0], e, suppressint));
+ TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
+ argv[0], e, suppress_int));
ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
/* NOTREACHED */
}
idx = cmdp->param.index;
path = pathval();
do {
- name = padvance(&path, cmdp->cmdname);
+ name = path_advance(&path, cmdp->cmdname);
stunalloc(name);
} while (--idx >= 0);
out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
cmdp->rehash = 0;
}
-static int
+static int FAST_FUNC
hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
struct tblentry **pp;
* pathval() still returns the old value at this point.
* Called with interrupts off.
*/
-static void
+static void FAST_FUNC
changepath(const char *new)
{
const char *old;
p = command;
} else {
do {
- p = padvance(&path, command);
+ p = path_advance(&path, command);
stunalloc(p);
} while (--j >= 0);
}
return 0;
}
-static int
+static int FAST_FUNC
typecmd(int argc UNUSED_PARAM, char **argv)
{
int i = 1;
}
#if ENABLE_ASH_CMDCMD
-static int
+static int FAST_FUNC
commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
int c;
/* ============ 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 uint8_t 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);
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;
+ pending_sig = 0;
xbarrier();
- for (i = 1, q = gotsig; i < NSIG; 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];
- 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);
int status;
+ int int_level;
+
+ SAVE_INT(int_level);
if (n == NULL) {
TRACE(("evaltree(NULL) called\n"));
goto out1;
}
- TRACE(("pid %d, evaltree(%p: %d, %d) called\n",
- getpid(), n, n->type, flags));
+ 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 == EXSIG)
+ 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);
}
if (exitstatus == 0) {
n = n->nif.ifpart;
goto evaln;
- } else if (n->nif.elsepart) {
+ }
+ if (n->nif.elsepart) {
n = n->nif.elsepart;
goto evaln;
}
out1:
if (checkexit & exitstatus)
evalskip |= SKIPEVAL;
- else if (pendingsig && dotrap())
+ else if (pending_sig && dotrap())
goto exexit;
if (flags & EV_EXIT) {
exexit:
raise_exception(EXEXIT);
}
+
+ RESTORE_INT(int_level);
+ TRACE(("leaving evaltree (no interrupts)\n"));
}
#if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
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.pipe_backgnd == 0) {
exitstatus = waitforjob(jp);
static smallint did_banner;
if (!did_banner) {
- out1fmt(
- "\n\n"
- "%s built-in shell (ash)\n"
+ /* note: ash and hush share this string */
+ out1fmt("\n\n%s %s\n"
"Enter 'help' for a list of built-in commands."
"\n\n",
- bb_banner);
+ bb_banner,
+ "built-in shell (ash)"
+ );
did_banner = 1;
}
}
while ((lvp = localvars) != NULL) {
localvars = lvp->next;
vp = lvp->vp;
- TRACE(("poplocalvar %s", vp ? vp->text : "-"));
+ TRACE(("poplocalvar %s\n", vp ? vp->text : "-"));
if (vp == NULL) { /* $- saved */
memcpy(optlist, lvp->text, sizeof(optlist));
free((char*)lvp->text);
/*
* The "local" command.
*/
-static int
+static int FAST_FUNC
localcmd(int argc UNUSED_PARAM, char **argv)
{
char *name;
return 0;
}
-static int
+static int FAST_FUNC
falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
return 1;
}
-static int
+static int FAST_FUNC
truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
return 0;
}
-static int
+static int FAST_FUNC
execcmd(int argc UNUSED_PARAM, char **argv)
{
if (argv[1]) {
/*
* The return command.
*/
-static int
+static int FAST_FUNC
returncmd(int argc UNUSED_PARAM, char **argv)
{
/*
}
/* Forward declarations for builtintab[] */
-static int breakcmd(int, char **);
-static int dotcmd(int, char **);
-static int evalcmd(int, char **);
-static int exitcmd(int, char **);
-static int exportcmd(int, char **);
+static int breakcmd(int, char **) FAST_FUNC;
+static int dotcmd(int, char **) FAST_FUNC;
+static int evalcmd(int, char **) FAST_FUNC;
+static int exitcmd(int, char **) FAST_FUNC;
+static int exportcmd(int, char **) FAST_FUNC;
#if ENABLE_ASH_GETOPTS
-static int getoptscmd(int, char **);
+static int getoptscmd(int, char **) FAST_FUNC;
#endif
#if !ENABLE_FEATURE_SH_EXTRA_QUIET
-static int helpcmd(int, char **);
+static int helpcmd(int, char **) FAST_FUNC;
#endif
-#if ENABLE_ASH_MATH_SUPPORT
-static int letcmd(int, char **);
+#if ENABLE_SH_MATH_SUPPORT
+static int letcmd(int, char **) FAST_FUNC;
#endif
-static int readcmd(int, char **);
-static int setcmd(int, char **);
-static int shiftcmd(int, char **);
-static int timescmd(int, char **);
-static int trapcmd(int, char **);
-static int umaskcmd(int, char **);
-static int unsetcmd(int, char **);
-static int ulimitcmd(int, char **);
+static int readcmd(int, char **) FAST_FUNC;
+static int setcmd(int, char **) FAST_FUNC;
+static int shiftcmd(int, char **) FAST_FUNC;
+static int timescmd(int, char **) FAST_FUNC;
+static int trapcmd(int, char **) FAST_FUNC;
+static int umaskcmd(int, char **) FAST_FUNC;
+static int unsetcmd(int, char **) FAST_FUNC;
+static int ulimitcmd(int, char **) FAST_FUNC;
#define BUILTIN_NOSPEC "0"
#define BUILTIN_SPECIAL "1"
#define BUILTIN_REG_ASSG "6"
#define BUILTIN_SPEC_REG_ASSG "7"
-/* 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
+/* Stubs for calling non-FAST_FUNC's */
+#if ENABLE_ASH_BUILTIN_ECHO
+static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
+#endif
+#if ENABLE_ASH_BUILTIN_PRINTF
+static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
+#endif
+#if ENABLE_ASH_BUILTIN_TEST
+static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
+#endif
/* Keep these in proper order since it is searched via bsearch() */
static const struct builtincmd builtintab[] = {
{ 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 },
return 0;
return *q == '=';
}
-static int
+static int FAST_FUNC
bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
/* Preserve exitstatus of a previous possible redirection
/* 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);
}
}
#endif
-
/* Fork off a child process if necessary. */
if (!(flags & EV_EXIT) || trap[0]) {
INT_OFF;
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;
if (i == EXINT)
exit_status = 128 + SIGINT;
if (i == EXSIG)
- exit_status = 128 + pendingsig;
+ exit_status = 128 + pending_sig;
exitstatus = exit_status;
if (i == EXINT || spclbltin > 0) {
raise:
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;
exitstatus |= ferror(stdout);
clearerr(stdout);
commandname = savecmdname;
-// exsig = 0;
exception_handler = savehandler;
return i;
* be an error to break out of more loops than exist, but it isn't
* in the standard shell so we don't make it one here.
*/
-static int
+static int FAST_FUNC
breakcmd(int argc UNUSED_PARAM, char **argv)
{
int n = argv[1] ? number(argv[1]) : 1;
if (n <= 0)
- ash_msg_and_raise_error(illnum, argv[1]);
+ ash_msg_and_raise_error(msg_illnum, argv[1]);
if (n > loopnest)
n = loopnest;
if (n > 0) {
* 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 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)
{
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);*/
+ 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 = g_parsefile->buf;
- parsenextc = buf;
+ g_parsefile->next_to_pgetc = buf;
#if ENABLE_FEATURE_EDITING
retry:
- if (!iflag || g_parsefile->fd)
+ if (!iflag || g_parsefile->fd != STDIN_FILENO)
nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
else {
#if ENABLE_FEATURE_TAB_COMPLETION
* 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.
- * 3) If the is more stuff in this buffer, use it else call read to fill it.
+ * 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 there 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 (g_parsefile->strpush) {
#if ENABLE_ASH_ALIAS
- if (parsenleft == -1 && g_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 || g_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.
- */
-#if !ENABLE_ASH_ALIAS
-#define pushstring(s, ap) pushstring(s)
-#endif
-static void
-pushstring(char *s, struct alias *ap)
-{
- struct strpush *sp;
- size_t len;
-
- len = strlen(s);
- INT_OFF;
-/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
- if (g_parsefile->strpush) {
- sp = ckzalloc(sizeof(struct strpush));
- sp->prev = g_parsefile->strpush;
- g_parsefile->strpush = sp;
- } else
- sp = g_parsefile->strpush = &(g_parsefile->basestrpush);
- sp->prevstring = parsenextc;
- sp->prevnleft = parsenleft;
-#if ENABLE_ASH_ALIAS
- sp->ap = ap;
- if (ap) {
- 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;
- g_parsefile->nleft = parsenleft;
- g_parsefile->lleft = parselleft;
- g_parsefile->nextc = parsenextc;
- g_parsefile->linno = plinno;
pf = ckzalloc(sizeof(*pf));
pf->prev = g_parsefile;
pf->fd = -1;
popstring();
g_parsefile = pf->prev;
free(pf);
- parsenleft = g_parsefile->nleft;
- parselleft = g_parsefile->lleft;
- parsenextc = g_parsefile->nextc;
- plinno = g_parsefile->linno;
INT_ON;
}
close_on_exec_on(fd);
if (push) {
pushfile();
- g_parsefile->buf = 0;
+ g_parsefile->buf = NULL;
}
g_parsefile->fd = fd;
if (g_parsefile->buf == NULL)
g_parsefile->buf = ckmalloc(IBUFSIZ);
- parselleft = parsenleft = 0;
- plinno = 1;
+ 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);
+ g_parsefile->next_to_pgetc = string;
+ g_parsefile->left_in_line = strlen(string);
g_parsefile->buf = NULL;
- plinno = 1;
+ g_parsefile->linno = 1;
INT_ON;
}
setstackmark(&smark);
mpath = mpathset() ? mpathval() : mailval();
for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
- p = padvance(&mpath, nullstr);
+ p = path_advance(&mpath, nullstr);
if (p == NULL)
break;
if (*p == '\0')
popstackmark(&smark);
}
-static void
+static void FAST_FUNC
changemail(const char *val UNUSED_PARAM)
{
mail_var_path_changed = 1;
/*
* The shift builtin command.
*/
-static int
+static int FAST_FUNC
shiftcmd(int argc UNUSED_PARAM, char **argv)
{
int n;
/*
* The set command builtin.
*/
-static int
+static int FAST_FUNC
setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
int retval;
}
#if ENABLE_ASH_RANDOM_SUPPORT
-static void
+static void FAST_FUNC
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 */
+ uint32_t t;
if (value == NULL) {
/* "get", generate */
- 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;
+ t = next_random(&random_gen);
/* set without recursion */
setvar(vrandom.text, utoa(t), VNOFUNC);
vrandom.flags &= ~VNOFUNC;
} else {
/* set/reset */
- random_galois_LFSR = random_LCG = strtoul(value, (char **)NULL, 10);
+ t = strtoul(value, NULL, 10);
+ INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
}
}
#endif
* be processed in the current argument. If shellparam.optnext is NULL,
* then it's the first time getopts has been called.
*/
-static int
+static int FAST_FUNC
getoptscmd(int argc, char **argv)
{
char **optbase;
static struct nodelist *backquotelist;
static union node *redirnode;
static struct heredoc *heredoc;
-/*
- * 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)
-
-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 */
-}
/*
* Called when an unexpected token is read during the parse. The argument
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);
* 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;
TRACE(("Here document %d\n", n->type));
if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
raise_error_syntax("illegal eof marker for << redirection");
- rmescapes(wordtext);
+ rmescapes(wordtext, 0);
here->eofmark = wordtext;
here->next = NULL;
if (heredoclist == NULL)
int parenlevel; /* levels of parens in arithmetic */
int dqvarnest; /* levels of variables expansion within double quotes */
- USE_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
+ IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
#if __GNUC__
/* Avoid longjmp clobbering */
(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();
dblquote = 1;
goto quotemark;
case CENDQUOTE:
- USE_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
+ 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 '))'");
#endif
if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
raise_error_syntax("unterminated quoted string");
if (varnest != 0) {
- startlinno = plinno;
+ startlinno = g_parsefile->linno;
/* { */
raise_error_syntax("missing '}'");
}
len = out - (char *)stackblock();
out = stackblock();
if (eofmark == NULL) {
- if ((c == '>' || c == '<') && quotef == 0) {
+ if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
+ && quotef == 0
+ ) {
if (isdigit_str9(out)) {
PARSEREDIR(); /* passed as params: out, c */
lasttoken = TREDIR;
continue;
if (*p == '\n' && *q == '\0') {
c = PEOF;
- plinno++;
+ g_parsefile->linno++;
needprompt = doprompt;
} else {
pushstring(line, NULL);
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) {
pungetc();
} else if (c == '(') { /* $(command) or $((arith)) */
if (pgetc() == '(') {
-#if ENABLE_ASH_MATH_SUPPORT
+#if ENABLE_SH_MATH_SUPPORT
PARSEARITH();
#else
raise_error_syntax("you disabled math support for $((arith)) syntax");
badsub:
raise_error_syntax("bad substitution");
}
+ if (c != '}' && subtype == VSLENGTH)
+ goto badsub;
STPUTC('=', out);
flags = 0;
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)
- continue;
+ 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 ((size_t)(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
}
}
- lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
- return lasttoken;
}
+ 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
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)
}
/*
- * Read and parse a command. Returns NEOF on end of file. (NULL is a
- * valid parse tree indicating a blank line.)
+ * Read and parse a command. Returns NODE_EOF on end of file.
+ * (NULL is a valid parse tree indicating a blank line.)
*/
static union node *
parsecmd(int interact)
needprompt = 0;
t = readtoken();
if (t == TEOF)
- return NEOF;
+ return NODE_EOF;
if (t == TNL)
return NULL;
tokpushback = 1;
{
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();
setstackmark(&smark);
skip = 0;
- while ((n = parsecmd(0)) != NEOF) {
+ while ((n = parsecmd(0)) != NODE_EOF) {
evaltree(n, 0);
popstackmark(&smark);
skip = evalskip;
/*
* The eval command.
*/
-static int
+static int FAST_FUNC
evalcmd(int argc UNUSED_PARAM, char **argv)
{
char *p;
#endif
}
n = parsecmd(inter);
- /* showtree(n); DEBUG */
- if (n == NEOF) {
+#if DEBUG
+ if (DEBUG > 2 && debug && (n != NODE_EOF))
+ showtree(n);
+#endif
+ if (n == NODE_EOF) {
if (!top || numeof >= 50)
break;
if (!stoppedjobs()) {
if (strchr(name, '/'))
return name;
- while ((fullname = padvance(&path, name)) != NULL) {
+ /* 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 = path_advance(&path, name)) != NULL) {
+ try_cur_dir:
if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
/*
* Don't bother freeing here, since it will
*/
return fullname;
}
- stunalloc(fullname);
+ if (fullname != name)
+ stunalloc(fullname);
}
/* not found in the PATH */
/* NOTREACHED */
}
-static int
+static int FAST_FUNC
dotcmd(int argc, char **argv)
{
struct strlist *sp;
return status;
}
-static int
+static int FAST_FUNC
exitcmd(int argc UNUSED_PARAM, char **argv)
{
if (stoppedjobs())
e = ENOENT;
idx = -1;
loop:
- while ((fullname = padvance(&path, name)) != NULL) {
+ while ((fullname = path_advance(&path, name)) != NULL) {
stunalloc(fullname);
/* NB: code below will still use fullname
* despite it being "unallocated" */
/*
* The trap builtin.
*/
-static int
+static int FAST_FUNC
trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
char *action;
ap = argptr;
if (!*ap) {
for (signo = 0; signo < NSIG; signo++) {
- if (trap[signo] != NULL) {
+ char *tr = trap_ptr[signo];
+ if (tr) {
+ /* note: bash adds "SIG", but only if invoked
+ * as "bash". If called as "sh", or if set -o posix,
+ * then it prints short signal names.
+ * We are printing short names: */
out1fmt("trap -- %s %s\n",
- single_quote(trap[signo]),
+ single_quote(tr),
get_signame(signo));
+ /* trap_ptr != trap only if we are in special-cased `trap` code.
+ * In this case, we will exit very soon, no need to free(). */
+ /* if (trap_ptr != trap && tp[0]) */
+ /* free(tr); */
}
}
+ /*
+ if (trap_ptr != trap) {
+ free(trap_ptr);
+ trap_ptr = trap;
+ }
+ */
return 0;
}
+
action = NULL;
if (ap[1])
action = *ap++;
/*
* Lists available builtins
*/
-static int
+static int FAST_FUNC
helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
unsigned col;
unsigned i;
- out1fmt("\nBuilt-in commands:\n-------------------\n");
+ out1fmt(
+ "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
+static int FAST_FUNC
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;
* variable to allow a function to be unset when there is a readonly variable
* with the same name.
*/
-static int
+static int FAST_FUNC
unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
char **ap;
0
};
-static int
+static int FAST_FUNC
timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
long clk_tck, s, t;
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
+static int FAST_FUNC
letcmd(int argc UNUSED_PARAM, char **argv)
{
arith_t i;
if (!*argv)
ash_msg_and_raise_error("expression expected");
do {
- i = dash_arith(*argv);
+ i = ash_arith(*argv);
} while (*++argv);
return !i;
}
-#endif /* ASH_MATH_SUPPORT */
+#endif /* SH_MATH_SUPPORT */
/* ============ miscbltin.c
* -d DELIM End on DELIM char, not newline
* -e Use line editing (tty only)
*/
-static int
+static int FAST_FUNC
readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
static const char *const arg_REPLY[] = { "REPLY", NULL };
rflag = 0;
prompt = NULL;
while ((i = nextopt("p:u:r"
- USE_ASH_READ_TIMEOUT("t:")
- USE_ASH_READ_NCHARS("n:s")
+ IF_ASH_READ_TIMEOUT("t:")
+ IF_ASH_READ_NCHARS("n:s")
)) != '\0') {
switch (i) {
case 'p':
#endif
status = 0;
- startword = 1;
+ startword = 2;
backslash = 0;
#if ENABLE_ASH_READ_TIMEOUT
if (timeout) /* NB: ensuring end_ms is nonzero */
#endif
STARTSTACKSTR(p);
do {
+ const char *is_ifs;
+
#if ENABLE_ASH_READ_TIMEOUT
if (end_ms) {
struct pollfd pfd[1];
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
#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)
return status;
}
-static int
+static int FAST_FUNC
umaskcmd(int argc UNUSED_PARAM, char **argv)
{
static const char permuser[3] ALIGN1 = "ugo";
S_IROTH, S_IWOTH, S_IXOTH
};
+ /* TODO: use bb_parse_mode() instead */
+
char *ap;
mode_t mask;
int i;
mask = 0;
do {
if (*ap >= '8' || *ap < '0')
- ash_msg_and_raise_error(illnum, argv[1]);
+ ash_msg_and_raise_error(msg_illnum, argv[1]);
mask = (mask << 3) + (*ap - '0');
} while (*++ap != '\0');
umask(mask);
*
* 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
+static int FAST_FUNC
ulimitcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
- int c;
- rlim_t val = 0;
+ rlim_t val;
enum limtype how = SOFT | HARD;
const struct limits *l;
int set, all = 0;
continue;
set = *argptr ? 1 : 0;
+ val = 0;
if (set) {
char *p = *argptr;
if (strncmp(p, "unlimited\n", 9) == 0)
val = RLIM_INFINITY;
else {
- val = (rlim_t) 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;
- }
- if (c)
+ if (sizeof(val) == sizeof(int))
+ val = bb_strtou(p, NULL, 10);
+ else if (sizeof(val) == sizeof(long))
+ val = bb_strtoul(p, NULL, 10);
+ else
+ val = bb_strtoull(p, NULL, 10);
+ if (errno)
ash_msg_and_raise_error("bad number");
val <<= l->factor_shift;
}
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 {
- 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_t {
- const char *var;
- struct chk_var_recursive_looped_t *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;
- operator *stack, *stackptr;
- const char *p = endexpression;
- int errcode;
- v_n_t *numstack, *numstackptr;
- unsigned 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. */
- numstackptr = numstack = alloca((datasizes / 2) * sizeof(numstack[0]));
- /* Stack of operator tokens */
- stackptr = stack = alloca(datasizes * sizeof(stack[0]));
-
- *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:
- *perrcode = -1;
- return *perrcode;
- }
- 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 */
/*
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
if (p) {
trap[0] = NULL;
evalstring(p, 0);
+ free(p);
}
flush_stdout_stderr();
out:
init(void)
{
/* from input.c: */
- basepf.nextc = basepf.buf = basebuf;
+ basepf.next_to_pgetc = basepf.buf = basebuf;
/* from trap.c: */
signal(SIGCHLD, SIG_DFL);
/* from var.c: */
{
char **envp;
- char ppid[sizeof(int)*3 + 1];
const char *p;
struct stat st1, st2;
}
}
- snprintf(ppid, sizeof(ppid), "%u", (unsigned) getppid());
- setvar("PPID", ppid, 0);
+ setvar("PPID", utoa(getppid()), 0);
p = lookupvar("PWD");
if (p)
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;
int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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
- /* 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(argv);
}
}
#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 MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
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