*
* Credits:
* The parser routines proper are all original material, first
- * written Dec 2000 and Jan 2001 by Larry Doolittle.
- * The execution engine, the builtins, and much of the underlying
- * support has been adapted from busybox-0.49pre's lash,
- * which is Copyright (C) 2000 by Lineo, Inc., and
- * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
- * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and
- * Erik W. Troan, which they placed in the public domain. I don't know
- * how much of the Johnson/Troan code has survived the repeated rewrites.
+ * written Dec 2000 and Jan 2001 by Larry Doolittle. The
+ * execution engine, the builtins, and much of the underlying
+ * support has been adapted from busybox-0.49pre's lash, which is
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ * written by Erik Andersen <andersen@codepoet.org>. That, in turn,
+ * is based in part on ladsh.c, by Michael K. Johnson and Erik W.
+ * Troan, which they placed in the public domain. I don't know
+ * how much of the Johnson/Troan code has survived the repeated
+ * rewrites.
+ *
* Other credits:
* simple_itoa() was lifted from boa-0.93.15
* b_addchr() derived from similar w_addchar function in glibc-2.2
* Brace Expansion
* Tilde Expansion
* fancy forms of Parameter Expansion
+ * aliases
* Arithmetic Expansion
* <(list) and >(list) Process Substitution
- * reserved words: if, then, elif, else, fi, while, until, for,
- * do, done, case
+ * reserved words: case, esac, select, function
* Here Documents ( << word )
* Functions
* Major bugs:
* job handling woefully incomplete and buggy
* reserved word execution woefully incomplete and buggy
- * incomplete reserved word sequence doesn't request more lines of input
* to-do:
- * port selected bugfixes from post-0.49 busybox lash
- * finish implementing reserved words
+ * port selected bugfixes from post-0.49 busybox lash - done?
+ * finish implementing reserved words: for, while, until, do, done
+ * change { and } from special chars to reserved words
+ * builtins: break, continue, eval, return, set, trap, ulimit
+ * test magic exec
* handle children going into background
* clean up recognition of null pipes
- * have builtin_exec set flag to avoid restore_redirects
- * figure out if "echo foo}" is fixable
* check setting of global_argc and global_argv
* control-C handling, probably with longjmp
- * VAR=value prefix for simple commands
* follow IFS rules more precisely, including update semantics
- * write builtin_eval, builtin_ulimit, builtin_umask
* figure out what to do with backslash-newline
* explain why we use signal instead of sigaction
* propagate syntax errors, die on resource errors?
* continuation lines, both explicit and implicit - done?
* memory leak finding and plugging - done?
* more testing, especially quoting rules and redirection
+ * document how quoting rules not precisely followed for variable assignments
* maybe change map[] to use 2-bit entries
* (eventually) remove all the printf's
- * more integration with BusyBox: prompts, cmdedit, applets
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <fcntl.h>
#include <getopt.h> /* should be pretty obvious */
+#include <sys/stat.h> /* ulimit */
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
/* #include <dmalloc.h> */
/* #define DEBUG_SHELL */
-#ifdef BB_VER
+#if 1
#include "busybox.h"
#include "cmdedit.h"
#else
-#define applet_name "hush"
+#define bb_applet_name "hush"
#include "standalone.h"
-#define shell_main main
-#define BB_FEATURE_SH_SIMPLE_PROMPT
+#define hush_main main
+#undef CONFIG_FEATURE_SH_FANCY_PROMPT
+#define BB_BANNER
#endif
+#define SPECIAL_VAR_SYMBOL 03
+#define FLAG_EXIT_FROM_LOOP 1
+#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
+#define FLAG_REPARSING (1 << 2) /* >=2nd pass */
typedef enum {
REDIRECT_INPUT = 1,
/* The descrip member of this structure is only used to make debugging
* output pretty */
-struct {int mode; int default_fd; char *descrip;} redir_table[] = {
+static struct {int mode; int default_fd; char *descrip;} redir_table[] = {
{ 0, 0, "()" },
{ O_RDONLY, 0, "<" },
{ O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
RES_DO = 9,
RES_DONE = 10,
RES_XXXX = 11,
- RES_SNTX = 12
+ RES_IN = 12,
+ RES_SNTX = 13
} reserved_style;
#define FLAG_END (1<<RES_NONE)
#define FLAG_IF (1<<RES_IF)
#define FLAG_UNTIL (1<<RES_UNTIL)
#define FLAG_DO (1<<RES_DO)
#define FLAG_DONE (1<<RES_DONE)
+#define FLAG_IN (1<<RES_IN)
#define FLAG_START (1<<RES_XXXX)
/* This holds pointers to the various results of parsing */
reserved_style w;
int old_flag; /* for figuring out valid reserved words */
struct p_context *stack;
+ int type; /* define type of parser : ";$" common or special symbol */
/* How about quoting status? */
};
redir_type type; /* type of redirection */
int fd; /* file descriptor being redirected */
int dup; /* -1, or file descriptor being duplicated */
- struct redir_struct *next; /* pointer to the next redirect in the list */
+ struct redir_struct *next; /* pointer to the next redirect in the list */
glob_t word; /* *word.gl_pathv is the filename */
};
glob_t glob_result; /* result of parameter globbing */
int is_stopped; /* is the program currently running? */
struct pipe *family; /* pointer back to the child's parent pipe */
+ int sp; /* number of SPECIAL_VAR_SYMBOL */
+ int type;
};
struct pipe {
int job_context; /* bitmask defining current context */
pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
reserved_style r_mode; /* supports if, for, while, until */
- struct jobset *job_list;
-};
-
-struct jobset {
- struct pipe *head; /* head of list of running jobs */
- struct pipe *fg; /* current foreground job */
};
struct close_me {
struct close_me *next;
};
+struct variables {
+ char *name;
+ char *value;
+ int flg_export;
+ int flg_read_only;
+ struct variables *next;
+};
+
/* globals, connect us to the outside world
* the first three support $?, $#, and $1 */
-char **global_argv;
-unsigned int global_argc;
-unsigned int last_return_code;
+static char **global_argv;
+static unsigned int global_argc;
+static unsigned int last_return_code;
extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
-
-/* Variables we export */
-unsigned int shell_context; /* Used in cmdedit.c to reset the
- * context when someone hits ^C */
/* "globals" within this file */
-static char *ifs=NULL;
+static char *ifs;
static char map[256];
-static int fake_mode=0;
-static int interactive=0;
-static struct close_me *close_me_head = NULL;
-static char *cwd;
-/* static struct jobset job_list = { NULL, NULL }; */
-static unsigned int last_bg_pid=0;
+static int fake_mode;
+static int interactive;
+static struct close_me *close_me_head;
+static const char *cwd;
+static struct pipe *job_list;
+static unsigned int last_bg_pid;
+static unsigned int last_jobid;
+static unsigned int shell_terminal;
static char *PS1;
-static char *PS2 = "> ";
+static char *PS2;
+static struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
+static struct variables *top_vars = &shell_ver;
+
#define B_CHUNK (100)
#define B_NOSPAC 1
-#define MAX_LINE 256 /* for cwd */
-#define MAX_READ 256 /* for builtin_read */
typedef struct {
char *data;
* available? Where is it documented? */
struct in_str {
const char *p;
+ char peek_buf[2];
int __promptme;
int promptmode;
FILE *file;
va_end(args);
}
#else
-static void debug_printf(const char *format, ...) { }
+static inline void debug_printf(const char *format, ...) { }
#endif
#define final_printf debug_printf
-void __syntax(char *file, int line) {
- fprintf(stderr,"syntax error %s:%d\n",file,line);
+static void __syntax(char *file, int line) {
+ bb_error_msg("syntax error %s:%d", file, line);
}
#define syntax() __syntax(__FILE__, __LINE__)
/* function prototypes for builtins */
static int builtin_cd(struct child_prog *child);
static int builtin_env(struct child_prog *child);
+static int builtin_eval(struct child_prog *child);
static int builtin_exec(struct child_prog *child);
static int builtin_exit(struct child_prog *child);
static int builtin_export(struct child_prog *child);
static int builtin_jobs(struct child_prog *child);
static int builtin_pwd(struct child_prog *child);
static int builtin_read(struct child_prog *child);
+static int builtin_set(struct child_prog *child);
static int builtin_shift(struct child_prog *child);
static int builtin_source(struct child_prog *child);
-static int builtin_ulimit(struct child_prog *child);
static int builtin_umask(struct child_prog *child);
static int builtin_unset(struct child_prog *child);
+static int builtin_not_written(struct child_prog *child);
/* o_string manipulation: */
static int b_check_space(o_string *o, int len);
static int b_addchr(o_string *o, int ch);
/* close_me manipulations: */
static void mark_open(int fd);
static void mark_closed(int fd);
-static void close_all();
+static void close_all(void);
/* "run" the final data structures: */
static char *indenter(int i);
-static int run_list_test(struct pipe *head, int indent);
-static int run_pipe_test(struct pipe *pi, int indent);
+static int free_pipe_list(struct pipe *head, int indent);
+static int free_pipe(struct pipe *pi, int indent);
/* really run the final data structures: */
static int setup_redirects(struct child_prog *prog, int squirrel[]);
-static int pipe_wait(struct pipe *pi);
static int run_list_real(struct pipe *pi);
static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
static int run_pipe_real(struct pipe *pi);
static int globhack(const char *src, int flags, glob_t *pglob);
static int glob_needed(const char *s);
static int xglob(o_string *dest, int flags, glob_t *pglob);
+/* variable assignment: */
+static int is_assignment(const char *s);
/* data structure manipulation: */
static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
static void initialize_context(struct p_context *ctx);
static int redirect_opt_num(o_string *o);
static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
-static void lookup_param(o_string *dest, struct p_context *ctx, o_string *src);
+static char *lookup_param(char *src);
+static char *make_string(char **inp);
static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
/* setup: */
-static int parse_stream_outer(struct in_str *inp);
-static int parse_string_outer(const char *s);
+static int parse_stream_outer(struct in_str *inp, int flag);
+static int parse_string_outer(const char *s, int flag);
static int parse_file_outer(FILE *f);
+/* job management: */
+static int checkjobs(struct pipe* fg_pipe);
+static void insert_bg_job(struct pipe *pi);
+static void remove_bg_job(struct pipe *pi);
+/* local variable support */
+static char **make_list_in(char **inp, char *name);
+static char *insert_var_value(char *inp);
+static char *get_local_var(const char *var);
+static void unset_local_var(const char *name);
+static int set_local_var(const char *s, int flg_export);
/* Table of built-in functions. They can be forked or not, depending on
* context: within pipes, they fork. As simple commands, they do not.
* still be set at the end. */
static struct built_in_command bltins[] = {
{"bg", "Resume a job in the background", builtin_fg_bg},
+ {"break", "Exit for, while or until loop", builtin_not_written},
{"cd", "Change working directory", builtin_cd},
+ {"continue", "Continue for, while or until loop", builtin_not_written},
{"env", "Print all environment variables", builtin_env},
- {"exec", "Exec command, replacing this shell with the exec'd process", builtin_exec},
+ {"eval", "Construct and run shell command", builtin_eval},
+ {"exec", "Exec command, replacing this shell with the exec'd process",
+ builtin_exec},
{"exit", "Exit from shell()", builtin_exit},
{"export", "Set environment variable", builtin_export},
{"fg", "Bring job into the foreground", builtin_fg_bg},
{"jobs", "Lists the active jobs", builtin_jobs},
{"pwd", "Print current directory", builtin_pwd},
{"read", "Input environment variable", builtin_read},
+ {"return", "Return from a function", builtin_not_written},
+ {"set", "Set/unset shell local variables", builtin_set},
{"shift", "Shift positional parameters", builtin_shift},
- {"ulimit","Controls resource limits", builtin_ulimit},
+ {"trap", "Trap signals", builtin_not_written},
+ {"ulimit","Controls resource limits", builtin_not_written},
{"umask","Sets file creation mask", builtin_umask},
{"unset", "Unset environment variable", builtin_unset},
{".", "Source-in and run commands in a file", builtin_source},
{NULL, NULL, NULL}
};
+static const char *set_cwd(void)
+{
+ if(cwd==bb_msg_unknown)
+ cwd = NULL; /* xgetcwd(arg) called free(arg) */
+ cwd = xgetcwd((char *)cwd);
+ if (!cwd)
+ cwd = bb_msg_unknown;
+ return cwd;
+}
+
+/* built-in 'eval' handler */
+static int builtin_eval(struct child_prog *child)
+{
+ char *str = NULL;
+ int rcode = EXIT_SUCCESS;
+
+ if (child->argv[1]) {
+ str = make_string(child->argv + 1);
+ parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
+ FLAG_PARSE_SEMICOLON);
+ free(str);
+ rcode = last_return_code;
+ }
+ return rcode;
+}
+
/* built-in 'cd <path>' handler */
static int builtin_cd(struct child_prog *child)
{
printf("cd: %s: %s\n", newdir, strerror(errno));
return EXIT_FAILURE;
}
- getcwd(cwd, sizeof(char)*MAX_LINE);
+ set_cwd();
return EXIT_SUCCESS;
}
static int builtin_exit(struct child_prog *child)
{
if (child->argv[1] == NULL)
- exit(EXIT_SUCCESS);
+ exit(last_return_code);
exit (atoi(child->argv[1]));
}
/* built-in 'export VAR=value' handler */
static int builtin_export(struct child_prog *child)
{
- int res;
+ int res = 0;
+ char *name = child->argv[1];
- if (child->argv[1] == NULL) {
+ if (name == NULL) {
return (builtin_env(child));
}
- res = putenv(child->argv[1]);
- if (res)
- fprintf(stderr, "export: %s\n", strerror(errno));
- return (res);
+
+ name = strdup(name);
+
+ if(name) {
+ char *value = strchr(name, '=');
+
+ if (!value) {
+ char *tmp;
+ /* They are exporting something without an =VALUE */
+
+ value = get_local_var(name);
+ if (value) {
+ size_t ln = strlen(name);
+
+ tmp = realloc(name, ln+strlen(value)+2);
+ if(tmp==NULL)
+ res = -1;
+ else {
+ sprintf(tmp+ln, "=%s", value);
+ name = tmp;
+ }
+ } else {
+ /* bash does not return an error when trying to export
+ * an undefined variable. Do likewise. */
+ res = 1;
+ }
+ }
+ }
+ if (res<0)
+ bb_perror_msg("export");
+ else if(res==0)
+ res = set_local_var(name, 1);
+ else
+ res = 0;
+ free(name);
+ return res;
}
/* built-in 'fg' and 'bg' handler */
static int builtin_fg_bg(struct child_prog *child)
{
- int i, jobNum;
- struct pipe *job=NULL;
-
- if (!child->argv[1] || child->argv[2]) {
- error_msg("%s: exactly one argument is expected\n",
- child->argv[0]);
- return EXIT_FAILURE;
- }
+ int i, jobnum;
+ struct pipe *pi=NULL;
- if (sscanf(child->argv[1], "%%%d", &jobNum) != 1) {
- error_msg("%s: bad argument '%s'\n",
- child->argv[0], child->argv[1]);
+ if (!interactive)
return EXIT_FAILURE;
- }
-
- for (job = child->family->job_list->head; job; job = job->next) {
- if (job->jobid == jobNum) {
- break;
+ /* If they gave us no args, assume they want the last backgrounded task */
+ if (!child->argv[1]) {
+ for (pi = job_list; pi; pi = pi->next) {
+ if (pi->jobid == last_jobid) {
+ break;
+ }
+ }
+ if (!pi) {
+ bb_error_msg("%s: no current job", child->argv[0]);
+ return EXIT_FAILURE;
+ }
+ } else {
+ if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
+ bb_error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
+ return EXIT_FAILURE;
+ }
+ for (pi = job_list; pi; pi = pi->next) {
+ if (pi->jobid == jobnum) {
+ break;
+ }
+ }
+ if (!pi) {
+ bb_error_msg("%s: %d: no such job", child->argv[0], jobnum);
+ return EXIT_FAILURE;
}
- }
-
- if (!job) {
- error_msg("%s: unknown job %d\n",
- child->argv[0], jobNum);
- return EXIT_FAILURE;
}
if (*child->argv[0] == 'f') {
- /* Make this job the foreground job */
- /* suppress messages when run from /linuxrc mag@sysgo.de */
- if (tcsetpgrp(0, job->pgrp) && errno != ENOTTY)
- perror_msg("tcsetpgrp");
- child->family->job_list->fg = job;
+ /* Put the job into the foreground. */
+ tcsetpgrp(shell_terminal, pi->pgrp);
}
/* Restart the processes in the job */
- for (i = 0; i < job->num_progs; i++)
- job->progs[i].is_stopped = 0;
+ for (i = 0; i < pi->num_progs; i++)
+ pi->progs[i].is_stopped = 0;
- kill(-job->pgrp, SIGCONT);
+ if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
+ if (i == ESRCH) {
+ remove_bg_job(pi);
+ } else {
+ bb_perror_msg("kill (SIGCONT)");
+ }
+ }
- job->stopped_progs = 0;
+ pi->stopped_progs = 0;
return EXIT_SUCCESS;
}
struct pipe *job;
char *status_string;
- for (job = child->family->job_list->head; job; job = job->next) {
+ for (job = job_list; job; job = job->next) {
if (job->running_progs == job->stopped_progs)
status_string = "Stopped";
else
status_string = "Running";
+
printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
}
return EXIT_SUCCESS;
/* built-in 'pwd' handler */
static int builtin_pwd(struct child_prog *dummy)
{
- getcwd(cwd, MAX_LINE);
- puts(cwd);
+ puts(set_cwd());
return EXIT_SUCCESS;
}
/* built-in 'read VAR' handler */
static int builtin_read(struct child_prog *child)
{
- int res = 0, len, newlen;
- char *s;
- char string[MAX_READ];
+ int res;
if (child->argv[1]) {
- /* argument (VAR) given: put "VAR=" into buffer */
- strcpy(string, child->argv[1]);
- len = strlen(string);
- string[len++] = '=';
- string[len] = '\0';
- /* XXX would it be better to go through in_str? */
- fgets(&string[len], sizeof(string) - len, stdin); /* read string */
- newlen = strlen(string);
- if(newlen > len)
- string[--newlen] = '\0'; /* chomp trailing newline */
- /*
- ** string should now contain "VAR=<value>"
- ** copy it (putenv() won't do that, so we must make sure
- ** the string resides in a static buffer!)
- */
- res = -1;
- if((s = strdup(string)))
- res = putenv(s);
+ char string[BUFSIZ];
+ char *var = 0;
+
+ string[0] = 0; /* In case stdin has only EOF */
+ /* read string */
+ fgets(string, sizeof(string), stdin);
+ chomp(string);
+ var = malloc(strlen(child->argv[1])+strlen(string)+2);
+ if(var) {
+ sprintf(var, "%s=%s", child->argv[1], string);
+ res = set_local_var(var, 0);
+ } else
+ res = -1;
if (res)
- fprintf(stderr, "read: %s\n", strerror(errno));
+ fprintf(stderr, "read: %m\n");
+ free(var); /* So not move up to avoid breaking errno */
+ return res;
+ } else {
+ do res=getchar(); while(res!='\n' && res!=EOF);
+ return 0;
}
+}
+
+/* built-in 'set VAR=value' handler */
+static int builtin_set(struct child_prog *child)
+{
+ char *temp = child->argv[1];
+ struct variables *e;
+
+ if (temp == NULL)
+ for(e = top_vars; e; e=e->next)
+ printf("%s=%s\n", e->name, e->value);
else
- fgets(string, sizeof(string), stdin);
+ set_local_var(temp, 0);
- return (res);
+ return EXIT_SUCCESS;
}
+
/* Built-in 'shift' handler */
static int builtin_shift(struct child_prog *child)
{
/* XXX search through $PATH is missing */
input = fopen(child->argv[1], "r");
if (!input) {
- fprintf(stderr, "Couldn't open file '%s'\n", child->argv[1]);
+ bb_error_msg("Couldn't open file '%s'", child->argv[1]);
return EXIT_FAILURE;
}
return (status);
}
-static int builtin_ulimit(struct child_prog *child)
-{
- printf("builtin_ulimit not written\n");
- return EXIT_FAILURE;
-}
-
static int builtin_umask(struct child_prog *child)
{
- printf("builtin_umask not written\n");
- return EXIT_FAILURE;
+ mode_t new_umask;
+ const char *arg = child->argv[1];
+ char *end;
+ if (arg) {
+ new_umask=strtoul(arg, &end, 8);
+ if (*end!='\0' || end == arg) {
+ return EXIT_FAILURE;
+ }
+ } else {
+ printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
+ }
+ umask(new_umask);
+ return EXIT_SUCCESS;
}
/* built-in 'unset VAR' handler */
static int builtin_unset(struct child_prog *child)
{
- if (child->argv[1] == NULL) {
- fprintf(stderr, "unset: parameter required.\n");
- return EXIT_FAILURE;
- }
- unsetenv(child->argv[1]);
+ /* bash returned already true */
+ unset_local_var(child->argv[1]);
return EXIT_SUCCESS;
}
+static int builtin_not_written(struct child_prog *child)
+{
+ printf("builtin_%s not written\n",child->argv[0]);
+ return EXIT_FAILURE;
+}
+
static int b_check_space(o_string *o, int len)
{
/* It would be easy to drop a more restrictive policy
static void b_free(o_string *o)
{
b_reset(o);
- if (o->data != NULL) free(o->data);
+ free(o->data);
o->data = NULL;
o->maxlen = 0;
}
}
/* belongs in utility.c */
-char *simple_itoa(unsigned int i)
+static char *simple_itoa(unsigned int i)
{
/* 21 digits plus null terminator, good for 64-bit or smaller ints */
static char local[22];
static inline void cmdedit_set_initial_prompt(void)
{
-#ifdef BB_FEATURE_SH_SIMPLE_PROMPT
+#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
PS1 = NULL;
#else
PS1 = getenv("PS1");
if(PS1==0)
PS1 = "\\w \\$ ";
-#endif
+#endif
}
static inline void setup_prompt_string(int promptmode, char **prompt_str)
{
debug_printf("setup_prompt_string %d ",promptmode);
-#ifdef BB_FEATURE_SH_SIMPLE_PROMPT
+#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
/* Set up the prompt */
if (promptmode == 1) {
- if (PS1)
- free(PS1);
+ free(PS1);
PS1=xmalloc(strlen(cwd)+4);
sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
*prompt_str = PS1;
*prompt_str = PS2;
}
#else
- *prompt_str = (promptmode==0)? PS1 : PS2;
+ *prompt_str = (promptmode==1)? PS1 : PS2;
#endif
debug_printf("result %s\n",*prompt_str);
}
static char the_command[BUFSIZ];
setup_prompt_string(i->promptmode, &prompt_str);
-#ifdef BB_FEATURE_COMMAND_EDITING
+#ifdef CONFIG_FEATURE_COMMAND_EDITING
/*
** enable command line editing only while a command line
** is actually being read; otherwise, we'll end up bequeathing
** child processes (rob@sysgo.de)
*/
cmdedit_read_input(prompt_str, the_command);
- cmdedit_terminate();
#else
fputs(prompt_str, stdout);
fflush(stdout);
the_command[0]=fgetc(i->file);
the_command[1]='\0';
#endif
+ fflush(stdout);
i->p = the_command;
}
-/* This is the magic location that prints prompts
+/* This is the magic location that prints prompts
* and gets data back from the user */
static int file_get(struct in_str *i)
{
/* need to double check i->file because we might be doing something
* more complicated by now, like sourcing or substituting. */
if (i->__promptme && interactive && i->file == stdin) {
- get_user_input(i);
+ while(! i->p || (interactive && strlen(i->p)==0) ) {
+ get_user_input(i);
+ }
i->promptmode=2;
+ i->__promptme = 0;
+ if (i->p && *i->p) {
+ ch=*i->p++;
+ }
+ } else {
+ ch = fgetc(i->file);
}
- i->__promptme = 0;
- if (i->p && *i->p) {
- ch=*i->p++;
- }
debug_printf("b_getch: got a %d\n", ch);
}
if (ch == '\n') i->__promptme=1;
if (i->p && *i->p) {
return *i->p;
} else {
- static char buffer;
- buffer = fgetc(i->file);
- i->p = &buffer;
+ i->peek_buf[0] = fgetc(i->file);
+ i->peek_buf[1] = '\0';
+ i->p = i->peek_buf;
debug_printf("b_peek: got a %d\n", *i->p);
- return *i->p;
+ return *i->p;
}
}
{
struct close_me *tmp;
if (close_me_head == NULL || close_me_head->fd != fd)
- error_msg_and_die("corrupt close_me");
+ bb_error_msg_and_die("corrupt close_me");
tmp = close_me_head;
close_me_head = close_me_head->next;
free(tmp);
}
-static void close_all()
+static void close_all(void)
{
struct close_me *c;
for (c=close_me_head; c; c=c->next) {
struct redir_struct *redir;
for (redir=prog->redirects; redir; redir=redir->next) {
+ if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
+ /* something went wrong in the parse. Pretend it didn't happen */
+ continue;
+ }
if (redir->dup == -1) {
mode=redir_table[redir->type].mode;
openfd = open(redir->word.gl_pathv[0], mode, 0666);
if (openfd < 0) {
/* this could get lost if stderr has been redirected, but
bash and ash both lose it as well (though zsh doesn't!) */
- fprintf(stderr,"error opening %s: %s\n", redir->word.gl_pathv[0],
- strerror(errno));
+ bb_perror_msg("error opening %s", redir->word.gl_pathv[0]);
return 1;
}
} else {
if (squirrel && redir->fd < 3) {
squirrel[redir->fd] = dup(redir->fd);
}
- dup2(openfd, redir->fd);
- close(openfd);
+ if (openfd == -3) {
+ close(openfd);
+ } else {
+ dup2(openfd, redir->fd);
+ if (redir->dup == -1)
+ close (openfd);
+ }
}
}
return 0;
}
}
-/* XXX this definitely needs some more thought, work, and
- * cribbing from other shells */
-static int pipe_wait(struct pipe *pi)
-{
- int rcode=0, i, pid, running, status;
- running = pi->num_progs;
- while (running) {
- pid=waitpid(-1, &status, 0);
- if (pid < 0) perror_msg_and_die("waitpid");
- for (i=0; i < pi->num_progs; i++) {
- if (pi->progs[i].pid == pid) {
- if (i==pi->num_progs-1) rcode=WEXITSTATUS(status);
- pi->progs[i].pid = 0;
- running--;
- break;
- }
- }
- }
- return rcode;
-}
-
-/* very simple version for testing */
+/* never returns */
+/* XXX no exit() here. If you don't exec, use _exit instead.
+ * The at_exit handlers apparently confuse the calling process,
+ * in particular stdin handling. Not sure why? */
static void pseudo_exec(struct child_prog *child)
{
- int rcode;
+ int i, rcode;
+ char *p;
struct built_in_command *x;
if (child->argv) {
+ for (i=0; is_assignment(child->argv[i]); i++) {
+ debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
+ p = insert_var_value(child->argv[i]);
+ putenv(strdup(p));
+ if (p != child->argv[i]) free(p);
+ }
+ child->argv+=i; /* XXX this hack isn't so horrible, since we are about
+ to exit, and therefore don't need to keep data
+ structures consistent for free() use. */
+ /* If a variable is assigned in a forest, and nobody listens,
+ * was it ever really set?
+ */
+ if (child->argv[0] == NULL) {
+ _exit(EXIT_SUCCESS);
+ }
+
/*
* Check if the command matches any of the builtins.
* Depending on context, this might be redundant. But it's
for (x = bltins; x->cmd; x++) {
if (strcmp(child->argv[0], x->cmd) == 0 ) {
debug_printf("builtin exec %s\n", child->argv[0]);
- exit(x->function(child));
+ rcode = x->function(child);
+ fflush(stdout);
+ _exit(rcode);
}
}
+
+ /* Check if the command matches any busybox internal commands
+ * ("applets") here.
+ * FIXME: This feature is not 100% safe, since
+ * BusyBox is not fully reentrant, so we have no guarantee the things
+ * from the .bss are still zeroed, or that things from .data are still
+ * at their defaults. We could exec ourself from /proc/self/exe, but I
+ * really dislike relying on /proc for things. We could exec ourself
+ * from global_argv[0], but if we are in a chroot, we may not be able
+ * to find ourself... */
+#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
+ {
+ int argc_l;
+ char** argv_l=child->argv;
+ char *name = child->argv[0];
+
+ /* Count argc for use in a second... */
+ for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
+ optind = 1;
+ debug_printf("running applet %s\n", name);
+ run_applet_by_name(name, argc_l, child->argv);
+ }
+#endif
debug_printf("exec of %s\n",child->argv[0]);
execvp(child->argv[0],child->argv);
- perror("execvp");
- exit(1);
+ bb_perror_msg("couldn't exec: %s",child->argv[0]);
+ _exit(1);
} else if (child->group) {
debug_printf("runtime nesting to group\n");
interactive=0; /* crucial!!!! */
rcode = run_list_real(child->group);
- /* OK to leak memory by not calling run_list_test,
+ /* OK to leak memory by not calling free_pipe_list,
* since this process is about to exit */
- exit(rcode);
+ _exit(rcode);
} else {
/* Can happen. See what bash does with ">foo" by itself. */
debug_printf("trying to pseudo_exec null command\n");
- exit(EXIT_SUCCESS);
+ _exit(EXIT_SUCCESS);
+ }
+}
+
+static void insert_bg_job(struct pipe *pi)
+{
+ struct pipe *thejob;
+
+ /* Linear search for the ID of the job to use */
+ pi->jobid = 1;
+ for (thejob = job_list; thejob; thejob = thejob->next)
+ if (thejob->jobid >= pi->jobid)
+ pi->jobid = thejob->jobid + 1;
+
+ /* add thejob to the list of running jobs */
+ if (!job_list) {
+ thejob = job_list = xmalloc(sizeof(*thejob));
+ } else {
+ for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
+ thejob->next = xmalloc(sizeof(*thejob));
+ thejob = thejob->next;
+ }
+
+ /* physically copy the struct job */
+ memcpy(thejob, pi, sizeof(struct pipe));
+ thejob->next = NULL;
+ thejob->running_progs = thejob->num_progs;
+ thejob->stopped_progs = 0;
+ thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
+
+ //if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0])
+ {
+ char *bar=thejob->text;
+ char **foo=pi->progs[0].argv;
+ while(foo && *foo) {
+ bar += sprintf(bar, "%s ", *foo++);
+ }
+ }
+
+ /* we don't wait for background thejobs to return -- append it
+ to the list of backgrounded thejobs and leave it alone */
+ printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
+ last_bg_pid = thejob->progs[0].pid;
+ last_jobid = thejob->jobid;
+}
+
+/* remove a backgrounded job */
+static void remove_bg_job(struct pipe *pi)
+{
+ struct pipe *prev_pipe;
+
+ if (pi == job_list) {
+ job_list = pi->next;
+ } else {
+ prev_pipe = job_list;
+ while (prev_pipe->next != pi)
+ prev_pipe = prev_pipe->next;
+ prev_pipe->next = pi->next;
}
+ if (job_list)
+ last_jobid = job_list->jobid;
+ else
+ last_jobid = 0;
+
+ pi->stopped_progs = 0;
+ free_pipe(pi, 0);
+ free(pi);
+}
+
+/* Checks to see if any processes have exited -- if they
+ have, figure out why and see if a job has completed */
+static int checkjobs(struct pipe* fg_pipe)
+{
+ int attributes;
+ int status;
+ int prognum = 0;
+ struct pipe *pi;
+ pid_t childpid;
+
+ attributes = WUNTRACED;
+ if (fg_pipe==NULL) {
+ attributes |= WNOHANG;
+ }
+
+ while ((childpid = waitpid(-1, &status, attributes)) > 0) {
+ if (fg_pipe) {
+ int i, rcode = 0;
+ for (i=0; i < fg_pipe->num_progs; i++) {
+ if (fg_pipe->progs[i].pid == childpid) {
+ if (i==fg_pipe->num_progs-1)
+ rcode=WEXITSTATUS(status);
+ (fg_pipe->num_progs)--;
+ return(rcode);
+ }
+ }
+ }
+
+ for (pi = job_list; pi; pi = pi->next) {
+ prognum = 0;
+ while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
+ prognum++;
+ }
+ if (prognum < pi->num_progs)
+ break;
+ }
+
+ if(pi==NULL) {
+ debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
+ continue;
+ }
+
+ if (WIFEXITED(status) || WIFSIGNALED(status)) {
+ /* child exited */
+ pi->running_progs--;
+ pi->progs[prognum].pid = 0;
+
+ if (!pi->running_progs) {
+ printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
+ remove_bg_job(pi);
+ }
+ } else {
+ /* child stopped */
+ pi->stopped_progs++;
+ pi->progs[prognum].is_stopped = 1;
+
+#if 0
+ /* Printing this stuff is a pain, since it tends to
+ * overwrite the prompt an inconveinient moments. So
+ * don't do that. */
+ if (pi->stopped_progs == pi->num_progs) {
+ printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
+ }
+#endif
+ }
+ }
+
+ if (childpid == -1 && errno != ECHILD)
+ bb_perror_msg("waitpid");
+
+ /* move the shell to the foreground */
+ //if (interactive && tcsetpgrp(shell_terminal, getpgid(0)))
+ // bb_perror_msg("tcsetpgrp-2");
+ return -1;
+}
+
+/* Figure out our controlling tty, checking in order stderr,
+ * stdin, and stdout. If check_pgrp is set, also check that
+ * we belong to the foreground process group associated with
+ * that tty. The value of shell_terminal is needed in order to call
+ * tcsetpgrp(shell_terminal, ...); */
+#if 0
+static void controlling_tty(int check_pgrp)
+{
+ pid_t curpgrp;
+
+ if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
+ && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
+ && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
+ goto shell_terminal_error;
+
+ if (check_pgrp && curpgrp != getpgid(0))
+ goto shell_terminal_error;
+
+ return;
+
+shell_terminal_error:
+ shell_terminal = -1;
+ return;
}
+#endif
/* run_pipe_real() starts all the jobs, but doesn't wait for anything
- * to finish. See pipe_wait().
+ * to finish. See checkjobs().
*
* return code is normally -1, when the caller has to wait for children
* to finish to determine the exit status of the pipe. If the pipe
int pipefds[2]; /* pipefds[0] is for reading */
struct child_prog *child;
struct built_in_command *x;
+ char *p;
nextin = 0;
- pi->pgrp = 0;
+ pi->pgrp = -1;
/* Check if this is a simple builtin (not part of a pipe).
* Builtins within pipes have to fork anyway, and are handled in
* pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
*/
- if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
- child = & (pi->progs[0]);
- if (child->group && ! child->subshell) {
- int squirrel[] = {-1, -1, -1};
- int rcode;
- debug_printf("non-subshell grouping\n");
- setup_redirects(child, squirrel);
- /* XXX could we merge code with following builtin case,
- * by creating a pseudo builtin that calls run_list_real? */
- rcode = run_list_real(child->group);
- restore_redirects(squirrel);
- return rcode;
+ if (pi->num_progs == 1) child = & (pi->progs[0]);
+ if (pi->num_progs == 1 && child->group && child->subshell == 0) {
+ int squirrel[] = {-1, -1, -1};
+ int rcode;
+ debug_printf("non-subshell grouping\n");
+ setup_redirects(child, squirrel);
+ /* XXX could we merge code with following builtin case,
+ * by creating a pseudo builtin that calls run_list_real? */
+ rcode = run_list_real(child->group);
+ restore_redirects(squirrel);
+ return rcode;
+ } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
+ for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
+ if (i!=0 && child->argv[i]==NULL) {
+ /* assignments, but no command: set the local environment */
+ for (i=0; child->argv[i]!=NULL; i++) {
+
+ /* Ok, this case is tricky. We have to decide if this is a
+ * local variable, or an already exported variable. If it is
+ * already exported, we have to export the new value. If it is
+ * not exported, we need only set this as a local variable.
+ * This junk is all to decide whether or not to export this
+ * variable. */
+ int export_me=0;
+ char *name, *value;
+ name = bb_xstrdup(child->argv[i]);
+ debug_printf("Local environment set: %s\n", name);
+ value = strchr(name, '=');
+ if (value)
+ *value=0;
+ if ( get_local_var(name)) {
+ export_me=1;
+ }
+ free(name);
+ p = insert_var_value(child->argv[i]);
+ set_local_var(p, export_me);
+ if (p != child->argv[i]) free(p);
+ }
+ return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
+ }
+ for (i = 0; is_assignment(child->argv[i]); i++) {
+ p = insert_var_value(child->argv[i]);
+ putenv(strdup(p));
+ if (p != child->argv[i]) {
+ child->sp--;
+ free(p);
+ }
+ }
+ if (child->sp) {
+ char * str = NULL;
+
+ str = make_string((child->argv + i));
+ parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
+ free(str);
+ return last_return_code;
}
for (x = bltins; x->cmd; x++) {
- if (strcmp(child->argv[0], x->cmd) == 0 ) {
+ if (strcmp(child->argv[i], x->cmd) == 0 ) {
int squirrel[] = {-1, -1, -1};
int rcode;
+ if (x->function == builtin_exec && child->argv[i+1]==NULL) {
+ debug_printf("magic exec\n");
+ setup_redirects(child,NULL);
+ return EXIT_SUCCESS;
+ }
debug_printf("builtin inline %s\n", child->argv[0]);
/* XXX setup_redirects acts on file descriptors, not FILEs.
* This is perfect for work that comes after exec().
* Is it really safe for inline use? Experimentally,
* things seem to work with glibc. */
setup_redirects(child, squirrel);
+ child->argv+=i; /* XXX horrible hack */
rcode = x->function(child);
+ child->argv-=i; /* XXX restore hack so free() can work right */
restore_redirects(squirrel);
return rcode;
}
/* pipes are inserted between pairs of commands */
if ((i + 1) < pi->num_progs) {
- if (pipe(pipefds)<0) perror_msg_and_die("pipe");
+ if (pipe(pipefds)<0) bb_perror_msg_and_die("pipe");
nextout = pipefds[1];
} else {
nextout=1;
}
/* XXX test for failed fork()? */
- if (!(child->pid = fork())) {
+#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
+ if (!(child->pid = fork()))
+#else
+ if (!(child->pid = vfork()))
+#endif
+ {
+ /* Set the handling for job control signals back to the default. */
+ signal(SIGINT, SIG_DFL);
+ signal(SIGQUIT, SIG_DFL);
+ signal(SIGTERM, SIG_DFL);
+ signal(SIGTSTP, SIG_DFL);
+ signal(SIGTTIN, SIG_DFL);
+ signal(SIGTTOU, SIG_DFL);
+ signal(SIGCHLD, SIG_DFL);
+
close_all();
if (nextin != 0) {
* and the pipe fd is available for dup'ing. */
setup_redirects(child,NULL);
+ if (interactive && pi->followup!=PIPE_BG) {
+ /* If we (the child) win the race, put ourselves in the process
+ * group whose leader is the first process in this pipe. */
+ if (pi->pgrp < 0) {
+ pi->pgrp = getpid();
+ }
+ if (setpgid(0, pi->pgrp) == 0) {
+ tcsetpgrp(2, pi->pgrp);
+ }
+ }
+
pseudo_exec(child);
}
- if (interactive) {
- /* Put our child in the process group whose leader is the
- * first process in this pipe. */
- if (pi->pgrp==0) {
- pi->pgrp = child->pid;
- }
- /* Don't check for errors. The child may be dead already,
- * in which case setpgid returns error code EACCES. */
- setpgid(child->pid, pi->pgrp);
+
+
+ /* put our child in the process group whose leader is the
+ first process in this pipe */
+ if (pi->pgrp < 0) {
+ pi->pgrp = child->pid;
}
- /* In the non-interactive case, do nothing. Leave the children
- * with the process group that they inherited from us. */
-
+ /* Don't check for errors. The child may be dead already,
+ * in which case setpgid returns error code EACCES. */
+ setpgid(child->pid, pi->pgrp);
+
if (nextin != 0)
close(nextin);
if (nextout != 1)
close(nextout);
- /* If there isn't another process, nextin is garbage
+ /* If there isn't another process, nextin is garbage
but it doesn't matter */
nextin = pipefds[0];
}
static int run_list_real(struct pipe *pi)
{
- int rcode=0;
+ char *save_name = NULL;
+ char **list = NULL;
+ char **save_list = NULL;
+ struct pipe *rpipe;
+ int flag_rep = 0;
+ int save_num_progs;
+ int rcode=0, flag_skip=1;
+ int flag_restore = 0;
int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
- reserved_style rmode=RES_NONE;
- for (;pi;pi=pi->next) {
+ reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
+ /* check syntax for "for" */
+ for (rpipe = pi; rpipe; rpipe = rpipe->next) {
+ if ((rpipe->r_mode == RES_IN ||
+ rpipe->r_mode == RES_FOR) &&
+ (rpipe->next == NULL)) {
+ syntax();
+ return 1;
+ }
+ if ((rpipe->r_mode == RES_IN &&
+ (rpipe->next->r_mode == RES_IN &&
+ rpipe->next->progs->argv != NULL))||
+ (rpipe->r_mode == RES_FOR &&
+ rpipe->next->r_mode != RES_IN)) {
+ syntax();
+ return 1;
+ }
+ }
+ for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
+ if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
+ pi->r_mode == RES_FOR) {
+ flag_restore = 0;
+ if (!rpipe) {
+ flag_rep = 0;
+ rpipe = pi;
+ }
+ }
rmode = pi->r_mode;
- debug_printf("rmode=%d if_code=%d next_if_code=%d\n", rmode, if_code, next_if_code);
+ debug_printf("rmode=%d if_code=%d next_if_code=%d skip_more=%d\n", rmode, if_code, next_if_code, skip_more_in_this_rmode);
+ if (rmode == skip_more_in_this_rmode && flag_skip) {
+ if (pi->followup == PIPE_SEQ) flag_skip=0;
+ continue;
+ }
+ flag_skip = 1;
+ skip_more_in_this_rmode = RES_XXXX;
if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
if (rmode == RES_THEN && if_code) continue;
if (rmode == RES_ELSE && !if_code) continue;
- if (rmode == RES_ELIF && !if_code) continue;
- if (pi->num_progs == 0) break;
+ if (rmode == RES_ELIF && !if_code) break;
+ if (rmode == RES_FOR && pi->num_progs) {
+ if (!list) {
+ /* if no variable values after "in" we skip "for" */
+ if (!pi->next->progs->argv) continue;
+ /* create list of variable values */
+ list = make_list_in(pi->next->progs->argv,
+ pi->progs->argv[0]);
+ save_list = list;
+ save_name = pi->progs->argv[0];
+ pi->progs->argv[0] = NULL;
+ flag_rep = 1;
+ }
+ if (!(*list)) {
+ free(pi->progs->argv[0]);
+ free(save_list);
+ list = NULL;
+ flag_rep = 0;
+ pi->progs->argv[0] = save_name;
+ pi->progs->glob_result.gl_pathv[0] =
+ pi->progs->argv[0];
+ continue;
+ } else {
+ /* insert new value from list for variable */
+ if (pi->progs->argv[0])
+ free(pi->progs->argv[0]);
+ pi->progs->argv[0] = *list++;
+ pi->progs->glob_result.gl_pathv[0] =
+ pi->progs->argv[0];
+ }
+ }
+ if (rmode == RES_IN) continue;
+ if (rmode == RES_DO) {
+ if (!flag_rep) continue;
+ }
+ if ((rmode == RES_DONE)) {
+ if (flag_rep) {
+ flag_restore = 1;
+ } else {
+ rpipe = NULL;
+ }
+ }
+ if (pi->num_progs == 0) continue;
+ save_num_progs = pi->num_progs; /* save number of programs */
rcode = run_pipe_real(pi);
+ debug_printf("run_pipe_real returned %d\n",rcode);
if (rcode!=-1) {
/* We only ran a builtin: rcode was set by the return value
* of run_pipe_real(), and we don't need to wait for anything. */
/* XXX check bash's behavior with nontrivial pipes */
/* XXX compute jobid */
/* XXX what does bash do with attempts to background builtins? */
- printf("[%d] %d\n", pi->jobid, pi->pgrp);
- last_bg_pid = pi->pgrp;
+ insert_bg_job(pi);
rcode = EXIT_SUCCESS;
} else {
if (interactive) {
/* move the new process group into the foreground */
- /* suppress messages when run from /linuxrc mag@sysgo.de */
- signal(SIGTTIN, SIG_IGN);
- signal(SIGTTOU, SIG_IGN);
- if (tcsetpgrp(0, pi->pgrp) && errno != ENOTTY)
- perror_msg("tcsetpgrp");
- rcode = pipe_wait(pi);
- if (tcsetpgrp(0, getpid()) && errno != ENOTTY)
- perror_msg("tcsetpgrp");
- signal(SIGTTIN, SIG_DFL);
- signal(SIGTTOU, SIG_DFL);
+ if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
+ bb_perror_msg("tcsetpgrp-3");
+ rcode = checkjobs(pi);
+ /* move the shell to the foreground */
+ if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
+ bb_perror_msg("tcsetpgrp-4");
} else {
- rcode = pipe_wait(pi);
+ rcode = checkjobs(pi);
}
+ debug_printf("checkjobs returned %d\n",rcode);
}
last_return_code=rcode;
+ pi->num_progs = save_num_progs; /* restore number of programs */
if ( rmode == RES_IF || rmode == RES_ELIF )
next_if_code=rcode; /* can be overwritten a number of times */
+ if (rmode == RES_WHILE)
+ flag_rep = !last_return_code;
+ if (rmode == RES_UNTIL)
+ flag_rep = last_return_code;
if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
(rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
- return rcode; /* XXX broken if list is part of if/then/else */
+ skip_more_in_this_rmode=rmode;
+ checkjobs(NULL);
}
return rcode;
}
}
/* return code is the exit status of the pipe */
-static int run_pipe_test(struct pipe *pi, int indent)
+static int free_pipe(struct pipe *pi, int indent)
{
char **p;
struct child_prog *child;
struct redir_struct *r, *rnext;
int a, i, ret_code=0;
char *ind = indenter(indent);
+
+ if (pi->stopped_progs > 0)
+ return ret_code;
final_printf("%s run pipe: (pid %d)\n",ind,getpid());
for (i=0; i<pi->num_progs; i++) {
child = &pi->progs[i];
child->argv=NULL;
} else if (child->group) {
final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
- ret_code = run_list_test(child->group,indent+3);
+ ret_code = free_pipe_list(child->group,indent+3);
final_printf("%s end group\n",ind);
} else {
final_printf("%s (nil)\n",ind);
for (r=child->redirects; r; r=rnext) {
final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
if (r->dup == -1) {
- final_printf(" %s\n", *r->word.gl_pathv);
- globfree(&r->word);
+ /* guard against the case >$FOO, where foo is unset or blank */
+ if (r->word.gl_pathv) {
+ final_printf(" %s\n", *r->word.gl_pathv);
+ globfree(&r->word);
+ }
} else {
final_printf("&%d\n", r->dup);
}
return ret_code;
}
-static int run_list_test(struct pipe *head, int indent)
+static int free_pipe_list(struct pipe *head, int indent)
{
int rcode=0; /* if list has no members */
struct pipe *pi, *next;
char *ind = indenter(indent);
for (pi=head; pi; pi=next) {
- if (pi->num_progs == 0) break;
final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
- rcode = run_pipe_test(pi, indent);
+ rcode = free_pipe(pi, indent);
final_printf("%s pipe followup code %d\n", ind, pi->followup);
next=pi->next;
pi->next=NULL;
free(pi);
}
- return rcode;
+ return rcode;
}
/* Select which version we will use */
int rcode=0;
if (fake_mode==0) {
rcode = run_list_real(pi);
- }
- /* run_list_test has the side effect of clearing memory
+ }
+ /* free_pipe_list has the side effect of clearing memory
* In the long run that function can be merged with run_list_real,
* but doing that now would hobble the debugging effort. */
- run_list_test(pi,0);
+ free_pipe_list(pi,0);
return rcode;
}
*/
static int globhack(const char *src, int flags, glob_t *pglob)
{
- int cnt, pathc;
+ int cnt=0, pathc;
const char *s;
char *dest;
- for (cnt=1, s=src; *s; s++) {
+ for (cnt=1, s=src; s && *s; s++) {
if (*s == '\\') s++;
cnt++;
}
if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
pglob->gl_pathv[pathc-1]=dest;
pglob->gl_pathv[pathc]=NULL;
- for (s=src; *s; s++, dest++) {
+ for (s=src; s && *s; s++, dest++) {
if (*s == '\\') s++;
*dest = *s;
}
gr = globhack(dest->data, flags, pglob);
debug_printf("globhack returned %d\n",gr);
}
- if (gr == GLOB_NOSPACE) {
- fprintf(stderr,"out of memory during glob\n");
- exit(1);
- }
+ if (gr == GLOB_NOSPACE)
+ bb_error_msg_and_die("out of memory during glob");
if (gr != 0) { /* GLOB_ABORTED ? */
- fprintf(stderr,"glob(3) error %d\n",gr);
+ bb_error_msg("glob(3) error %d",gr);
}
/* globprint(glob_target); */
return gr;
}
+/* This is used to get/check local shell variables */
+static char *get_local_var(const char *s)
+{
+ struct variables *cur;
+
+ if (!s)
+ return NULL;
+ for (cur = top_vars; cur; cur=cur->next)
+ if(strcmp(cur->name, s)==0)
+ return cur->value;
+ return NULL;
+}
+
+/* This is used to set local shell variables
+ flg_export==0 if only local (not exporting) variable
+ flg_export==1 if "new" exporting environ
+ flg_export>1 if current startup environ (not call putenv()) */
+static int set_local_var(const char *s, int flg_export)
+{
+ char *name, *value;
+ int result=0;
+ struct variables *cur;
+
+ name=strdup(s);
+
+ /* Assume when we enter this function that we are already in
+ * NAME=VALUE format. So the first order of business is to
+ * split 's' on the '=' into 'name' and 'value' */
+ value = strchr(name, '=');
+ if (value==0 && ++value==0) {
+ free(name);
+ return -1;
+ }
+ *value++ = 0;
+
+ for(cur = top_vars; cur; cur = cur->next) {
+ if(strcmp(cur->name, name)==0)
+ break;
+ }
+
+ if(cur) {
+ if(strcmp(cur->value, value)==0) {
+ if(flg_export>0 && cur->flg_export==0)
+ cur->flg_export=flg_export;
+ else
+ result++;
+ } else {
+ if(cur->flg_read_only) {
+ bb_error_msg("%s: readonly variable", name);
+ result = -1;
+ } else {
+ if(flg_export>0 || cur->flg_export>1)
+ cur->flg_export=1;
+ free(cur->value);
+
+ cur->value = strdup(value);
+ }
+ }
+ } else {
+ cur = malloc(sizeof(struct variables));
+ if(!cur) {
+ result = -1;
+ } else {
+ cur->name = strdup(name);
+ if(cur->name == 0) {
+ free(cur);
+ result = -1;
+ } else {
+ struct variables *bottom = top_vars;
+ cur->value = strdup(value);
+ cur->next = 0;
+ cur->flg_export = flg_export;
+ cur->flg_read_only = 0;
+ while(bottom->next) bottom=bottom->next;
+ bottom->next = cur;
+ }
+ }
+ }
+
+ if(result==0 && cur->flg_export==1) {
+ *(value-1) = '=';
+ result = putenv(name);
+ } else {
+ free(name);
+ if(result>0) /* equivalent to previous set */
+ result = 0;
+ }
+ return result;
+}
+
+static void unset_local_var(const char *name)
+{
+ struct variables *cur;
+
+ if (name) {
+ for (cur = top_vars; cur; cur=cur->next) {
+ if(strcmp(cur->name, name)==0)
+ break;
+ }
+ if(cur!=0) {
+ struct variables *next = top_vars;
+ if(cur->flg_read_only) {
+ bb_error_msg("%s: readonly variable", name);
+ return;
+ } else {
+ if(cur->flg_export)
+ unsetenv(cur->name);
+ free(cur->name);
+ free(cur->value);
+ while (next->next != cur)
+ next = next->next;
+ next->next = cur->next;
+ }
+ free(cur);
+ }
+ }
+}
+
+static int is_assignment(const char *s)
+{
+ if (s==NULL || !isalpha(*s)) return 0;
+ ++s;
+ while(isalnum(*s) || *s=='_') ++s;
+ return *s=='=';
+}
+
/* the src parameter allows us to peek forward to a possible &n syntax
* for file descriptor duplication, e.g., "2>&1".
* Return code is 0 normally, 1 if a syntax error is detected in src.
}
redir = xmalloc(sizeof(struct redir_struct));
redir->next=NULL;
+ redir->word.gl_pathv=NULL;
if (last_redir) {
last_redir->next=redir;
} else {
debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
- /* Check for a '2>&1' type redirect */
+ /* Check for a '2>&1' type redirect */
redir->dup = redirect_dup_num(input);
if (redir->dup == -2) return 1; /* syntax error */
if (redir->dup != -1) {
/* Erik had a check here that the file descriptor in question
- * is legit; I postpone that to "run time" */
+ * is legit; I postpone that to "run time"
+ * A "-" representation of "close me" shows up as a -3 here */
debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
} else {
/* We do _not_ try to open the file that src points to,
return 0;
}
-struct pipe *new_pipe(void) {
+static struct pipe *new_pipe(void) {
struct pipe *pi;
pi = xmalloc(sizeof(struct pipe));
pi->num_progs = 0;
ctx->pipe=ctx->list_head;
ctx->w=RES_NONE;
ctx->stack=NULL;
+ ctx->old_flag=0;
done_command(ctx); /* creates the memory for working child */
}
* should handle if, then, elif, else, fi, for, while, until, do, done.
* case, function, and select are obnoxious, save those for later.
*/
-int reserved_word(o_string *dest, struct p_context *ctx)
+static int reserved_word(o_string *dest, struct p_context *ctx)
{
struct reserved_combo {
char *literal;
{ "elif", RES_ELIF, FLAG_THEN },
{ "else", RES_ELSE, FLAG_FI },
{ "fi", RES_FI, FLAG_END },
- { "for", RES_FOR, FLAG_DO | FLAG_START },
+ { "for", RES_FOR, FLAG_IN | FLAG_START },
{ "while", RES_WHILE, FLAG_DO | FLAG_START },
{ "until", RES_UNTIL, FLAG_DO | FLAG_START },
+ { "in", RES_IN, FLAG_DO },
{ "do", RES_DO, FLAG_DONE },
{ "done", RES_DONE, FLAG_END }
};
if (r->flag & FLAG_START) {
struct p_context *new = xmalloc(sizeof(struct p_context));
debug_printf("push stack\n");
+ if (ctx->w == RES_IN || ctx->w == RES_FOR) {
+ syntax();
+ free(new);
+ ctx->w = RES_SNTX;
+ b_reset(dest);
+ return 1;
+ }
*new = *ctx; /* physical copy */
initialize_context(ctx);
ctx->stack=new;
} else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
syntax();
ctx->w = RES_SNTX;
- b_reset (dest);
+ b_reset(dest);
return 1;
}
ctx->w=r->code;
if (ctx->old_flag & FLAG_END) {
struct p_context *old;
debug_printf("pop stack\n");
+ done_pipe(ctx,PIPE_SEQ);
old = ctx->stack;
old->child->group = ctx->list_head;
+ old->child->subshell = 0;
*ctx = *old; /* physical copy */
free(old);
- ctx->w=RES_NONE;
}
b_reset (dest);
return 1;
syntax();
return 1; /* syntax error, groups and arglists don't mix */
}
- if (!child->argv) {
+ if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
debug_printf("checking %s for reserved-ness\n",dest->data);
if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
}
if (ctx->pending_redirect) {
ctx->pending_redirect=NULL;
if (glob_target->gl_pathc != 1) {
- fprintf(stderr, "ambiguous redirect\n");
+ bb_error_msg("ambiguous redirect");
return 1;
}
} else {
child->argv = glob_target->gl_pathv;
}
+ if (ctx->w == RES_FOR) {
+ done_word(dest,ctx);
+ done_pipe(ctx,PIPE_SEQ);
+ }
return 0;
}
prog->group = NULL;
prog->glob_result.gl_pathv = NULL;
prog->family = pi;
+ prog->sp = 0;
+ ctx->child = prog;
+ prog->type = ctx->type;
- ctx->child=prog;
/* but ctx->pipe and ctx->list_head remain unchanged */
return 0;
}
if (ch != '&') return -1;
b_getch(input); /* get the & */
- while (ch=b_peek(input),isdigit(ch)) {
+ ch=b_peek(input);
+ if (ch == '-') {
+ b_getch(input);
+ return -3; /* "-" represents "close me" */
+ }
+ while (isdigit(ch)) {
d = d*10+(ch-'0');
ok=1;
b_getch(input);
+ ch = b_peek(input);
}
if (ok) return d;
- fprintf(stderr, "ambiguous redirect\n");
+ bb_error_msg("ambiguous redirect");
return -2;
}
return num;
}
-FILE *generate_stream_from_list(struct pipe *head)
+static FILE *generate_stream_from_list(struct pipe *head)
{
FILE *pf;
#if 1
int pid, channel[2];
- if (pipe(channel)<0) perror_msg_and_die("pipe");
+ if (pipe(channel)<0) bb_perror_msg_and_die("pipe");
+#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
pid=fork();
+#else
+ pid=vfork();
+#endif
if (pid<0) {
- perror_msg_and_die("fork");
+ bb_perror_msg_and_die("fork");
} else if (pid==0) {
close(channel[0]);
if (channel[1] != 1) {
#if 0
#define SURROGATE "surrogate response"
write(1,SURROGATE,sizeof(SURROGATE));
- exit(run_list(head));
+ _exit(run_list(head));
#else
- exit(run_list_real(head)); /* leaks memory */
+ _exit(run_list_real(head)); /* leaks memory */
#endif
}
debug_printf("forked child %d\n",pid);
pf = fdopen(channel[0],"r");
debug_printf("pipe on FILE *%p\n",pf);
#else
- run_list_test(head,0);
+ free_pipe_list(head,0);
pf=popen("echo surrogate response","r");
debug_printf("started fake pipe on FILE *%p\n",pf);
#endif
* to the KISS philosophy of this program. */
mark_closed(fileno(p));
retcode=pclose(p);
+ free_pipe_list(inner.list_head,0);
debug_printf("pclosed, retcode=%d\n",retcode);
/* XXX this process fails to trim a single trailing newline */
return retcode;
/* basically useful version until someone wants to get fancier,
* see the bash man page under "Parameter Expansion" */
-static void lookup_param(o_string *dest, struct p_context *ctx, o_string *src)
+static char *lookup_param(char *src)
{
- const char *p=NULL;
- if (src->data) p = getenv(src->data);
- if (p) parse_string(dest, ctx, p); /* recursion */
- b_free(src);
+ char *p=NULL;
+ if (src) {
+ p = getenv(src);
+ if (!p)
+ p = get_local_var(src);
+ }
+ return p;
}
/* return code: 0 for OK, 1 for syntax error */
static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
{
int i, advance=0;
- o_string alt=NULL_O_STRING;
char sep[]=" ";
int ch = input->peek(input); /* first character after the $ */
debug_printf("handle_dollar: ch=%c\n",ch);
if (isalpha(ch)) {
+ b_addchr(dest, SPECIAL_VAR_SYMBOL);
+ ctx->child->sp++;
while(ch=b_peek(input),isalnum(ch) || ch=='_') {
b_getch(input);
- b_addchr(&alt,ch);
+ b_addchr(dest,ch);
}
- lookup_param(dest, ctx, &alt);
+ b_addchr(dest, SPECIAL_VAR_SYMBOL);
} else if (isdigit(ch)) {
i = ch-'0'; /* XXX is $0 special? */
if (i<global_argc) {
advance = 1;
break;
case '{':
+ b_addchr(dest, SPECIAL_VAR_SYMBOL);
+ ctx->child->sp++;
b_getch(input);
/* XXX maybe someone will try to escape the '}' */
while(ch=b_getch(input),ch!=EOF && ch!='}') {
- b_addchr(&alt,ch);
+ b_addchr(dest,ch);
}
if (ch != '}') {
syntax();
return 1;
}
- lookup_param(dest, ctx, &alt);
+ b_addchr(dest, SPECIAL_VAR_SYMBOL);
break;
case '(':
+ b_getch(input);
process_command_subs(dest, ctx, input, ')');
break;
case '*':
case '-':
case '_':
/* still unhandled, but should be eventually */
- fprintf(stderr,"unhandled syntax: $%c\n",ch);
+ bb_error_msg("unhandled syntax: $%c",ch);
return 1;
break;
default:
ch,ch,m,dest->quote);
if (m==0 || ((m==1 || m==2) && dest->quote)) {
b_addqchr(dest, ch, dest->quote);
- } else if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
- debug_printf("leaving parse_stream\n");
- return 0;
- } else if (m==2 && !dest->quote) { /* IFS */
- done_word(dest, ctx);
- if (ch=='\n') done_pipe(ctx,PIPE_SEQ);
+ } else {
+ if (m==2) { /* unquoted IFS */
+ if (done_word(dest, ctx)) {
+ return 1;
+ }
+ /* If we aren't performing a substitution, treat a newline as a
+ * command separator. */
+ if (end_trigger != '\0' && ch=='\n')
+ done_pipe(ctx,PIPE_SEQ);
+ }
if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
- debug_printf("leaving parse_stream (stupid duplication)\n");
+ debug_printf("leaving parse_stream (triggered)\n");
return 0;
}
#if 0
initialize_context(ctx);
}
#endif
- } else switch (ch) {
+ if (m!=2) switch (ch) {
case '#':
if (dest->length == 0 && !dest->quote) {
while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
default:
syntax(); /* this is really an internal logic error */
return 1;
+ }
}
}
/* complain if quote? No, maybe we just finished a command substitution
* that was quoted. Example:
- * $ echo "`cat foo` plus more"
+ * $ echo "`cat foo` plus more"
* and we just got the EOF generated by the subshell that ran "cat foo"
* The only real complaint is if we got an EOF when end_trigger != '\0',
* that is, we were really supposed to get end_trigger, and never got
* one before the EOF. Can't use the standard "syntax error" return code,
* so that parse_stream_outer can distinguish the EOF and exit smoothly. */
+ debug_printf("leaving parse_stream (EOF)\n");
if (end_trigger != '\0') return -1;
return 0;
}
-void mapset(const unsigned char *set, int code)
+static void mapset(const unsigned char *set, int code)
{
const unsigned char *s;
for (s=set; *s; s++) map[*s] = code;
}
-void update_ifs_map(void)
+static void update_ifs_map(void)
{
/* char *ifs and char map[256] are both globals. */
ifs = getenv("IFS");
* The map[] array only really needs two bits each, and on most machines
* that would be faster because of the reduced L1 cache footprint.
*/
- memset(map,0,256); /* most characters flow through always */
- mapset("\\$'\"`", 3); /* never flow through */
- mapset("<>;&|(){}#", 1); /* flow through if quoted */
- mapset(ifs, 2); /* also flow through if quoted */
+ memset(map,0,sizeof(map)); /* most characters flow through always */
+ mapset("\\$'\"`", 3); /* never flow through */
+ mapset("<>;&|(){}#", 1); /* flow through if quoted */
+ mapset(ifs, 2); /* also flow through if quoted */
}
-/* most recursion does not come through here, the exeception is
+/* most recursion does not come through here, the exception is
* from builtin_source() */
-int parse_stream_outer(struct in_str *inp)
+int parse_stream_outer(struct in_str *inp, int flag)
{
struct p_context ctx;
o_string temp=NULL_O_STRING;
int rcode;
do {
+ ctx.type = flag;
initialize_context(&ctx);
update_ifs_map();
+ if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset(";$&|", 0);
inp->promptmode=1;
rcode = parse_stream(&temp, &ctx, inp, '\n');
- done_word(&temp, &ctx);
- done_pipe(&ctx,PIPE_SEQ);
- run_list(ctx.list_head);
- } while (rcode != -1); /* loop on syntax errors, return on EOF */
+ if (rcode != 1 && ctx.old_flag != 0) {
+ syntax();
+ }
+ if (rcode != 1 && ctx.old_flag == 0) {
+ done_word(&temp, &ctx);
+ done_pipe(&ctx,PIPE_SEQ);
+ run_list(ctx.list_head);
+ } else {
+ if (ctx.old_flag != 0) {
+ free(ctx.stack);
+ b_reset(&temp);
+ }
+ temp.nonnull = 0;
+ temp.quote = 0;
+ inp->p = NULL;
+ free_pipe_list(ctx.list_head,0);
+ }
+ b_free(&temp);
+ } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
return 0;
}
-static int parse_string_outer(const char *s)
+static int parse_string_outer(const char *s, int flag)
{
struct in_str input;
setup_string_in_str(&input, s);
- return parse_stream_outer(&input);
+ return parse_stream_outer(&input, flag);
}
static int parse_file_outer(FILE *f)
int rcode;
struct in_str input;
setup_file_in_str(&input, f);
- rcode = parse_stream_outer(&input);
+ rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
return rcode;
}
-int shell_main(int argc, char **argv)
+/* Make sure we have a controlling tty. If we get started under a job
+ * aware app (like bash for example), make sure we are now in charge so
+ * we don't fight over who gets the foreground */
+static void setup_job_control(void)
+{
+ static pid_t shell_pgrp;
+ /* Loop until we are in the foreground. */
+ while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
+ kill (- shell_pgrp, SIGTTIN);
+
+ /* Ignore interactive and job-control signals. */
+ signal(SIGINT, SIG_IGN);
+ signal(SIGQUIT, SIG_IGN);
+ signal(SIGTERM, SIG_IGN);
+ signal(SIGTSTP, SIG_IGN);
+ signal(SIGTTIN, SIG_IGN);
+ signal(SIGTTOU, SIG_IGN);
+ signal(SIGCHLD, SIG_IGN);
+
+ /* Put ourselves in our own process group. */
+ setsid();
+ shell_pgrp = getpid ();
+ setpgid (shell_pgrp, shell_pgrp);
+
+ /* Grab control of the terminal. */
+ tcsetpgrp(shell_terminal, shell_pgrp);
+}
+
+int hush_main(int argc, char **argv)
{
int opt;
FILE *input;
+ char **e = environ;
/* XXX what should these be while sourcing /etc/profile? */
global_argc = argc;
global_argv = argv;
- if (argv[0] && argv[0][0] == '-') {
- debug_printf("\nsourcing /etc/profile\n");
- input = xfopen("/etc/profile", "r");
- mark_open(fileno(input));
- parse_file_outer(input);
- mark_closed(fileno(input));
- fclose(input);
- }
- input=stdin;
-
- /* initialize the cwd -- this is never freed...*/
- cwd = xgetcwd(0);
-#ifdef BB_FEATURE_COMMAND_EDITING
+ /* (re?) initialize globals. Sometimes hush_main() ends up calling
+ * hush_main(), therefore we cannot rely on the BSS to zero out this
+ * stuff. Reset these to 0 every time. */
+ ifs = NULL;
+ /* map[] is taken care of with call to update_ifs_map() */
+ fake_mode = 0;
+ interactive = 0;
+ close_me_head = NULL;
+ last_bg_pid = 0;
+ job_list = NULL;
+ last_jobid = 0;
+
+ /* Initialize some more globals to non-zero values */
+ set_cwd();
+#ifdef CONFIG_FEATURE_COMMAND_EDITING
cmdedit_set_initial_prompt();
#else
PS1 = NULL;
#endif
-
+ PS2 = "> ";
+
+ /* initialize our shell local variables with the values
+ * currently living in the environment */
+ if (e) {
+ for (; *e; e++)
+ set_local_var(*e, 2); /* without call putenv() */
+ }
+
+ last_return_code=EXIT_SUCCESS;
+
+
+ if (argv[0] && argv[0][0] == '-') {
+ debug_printf("\nsourcing /etc/profile\n");
+ if ((input = fopen("/etc/profile", "r")) != NULL) {
+ mark_open(fileno(input));
+ parse_file_outer(input);
+ mark_closed(fileno(input));
+ fclose(input);
+ }
+ }
+ input=stdin;
+
while ((opt = getopt(argc, argv, "c:xif")) > 0) {
switch (opt) {
case 'c':
{
global_argv = argv+optind;
global_argc = argc-optind;
- opt = parse_string_outer(optarg);
- exit(opt);
+ opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
+ goto final_return;
}
break;
case 'i':
fake_mode++;
break;
default:
+#ifndef BB_VER
fprintf(stderr, "Usage: sh [FILE]...\n"
" or: sh -c command [args]...\n\n");
exit(EXIT_FAILURE);
+#else
+ bb_show_usage();
+#endif
}
}
/* A shell is interactive if the `-i' flag was given, or if all of
* standard output is a terminal
* Refer to Posix.2, the description of the `sh' utility. */
if (argv[optind]==NULL && input==stdin &&
- isatty(fileno(stdin)) && isatty(fileno(stdout))) {
+ isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
interactive++;
}
-
+
+ debug_printf("\ninteractive=%d\n", interactive);
if (interactive) {
/* Looks like they want an interactive shell */
- fprintf(stdout, "\nhush -- the humble shell v0.01 (testing)\n\n");
- exit(parse_file_outer(stdin));
+#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
+ printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
+ printf( "Enter 'help' for a list of built-in commands.\n\n");
+#endif
+ setup_job_control();
+ }
+
+ if (argv[optind]==NULL) {
+ opt=parse_file_outer(stdin);
+ goto final_return;
}
- debug_printf("\ninteractive=%d\n", interactive);
debug_printf("\nrunning script '%s'\n", argv[optind]);
global_argv = argv+optind;
global_argc = argc-optind;
- input = xfopen(argv[optind], "r");
+ input = bb_xfopen(argv[optind], "r");
opt = parse_file_outer(input);
-#ifdef BB_FEATURE_CLEAN_UP
- fclose(input.file);
+#ifdef CONFIG_FEATURE_CLEAN_UP
+ fclose(input);
+ if (cwd && cwd != bb_msg_unknown)
+ free((char*)cwd);
+ {
+ struct variables *cur, *tmp;
+ for(cur = top_vars; cur; cur = tmp) {
+ tmp = cur->next;
+ if (!cur->flg_read_only) {
+ free(cur->name);
+ free(cur->value);
+ free(cur);
+ }
+ }
+ }
#endif
- return(opt);
+final_return:
+ return(opt?opt:last_return_code);
+}
+
+static char *insert_var_value(char *inp)
+{
+ int res_str_len = 0;
+ int len;
+ int done = 0;
+ char *p, *p1, *res_str = NULL;
+
+ while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
+ if (p != inp) {
+ len = p - inp;
+ res_str = xrealloc(res_str, (res_str_len + len));
+ strncpy((res_str + res_str_len), inp, len);
+ res_str_len += len;
+ }
+ inp = ++p;
+ p = strchr(inp, SPECIAL_VAR_SYMBOL);
+ *p = '\0';
+ if ((p1 = lookup_param(inp))) {
+ len = res_str_len + strlen(p1);
+ res_str = xrealloc(res_str, (1 + len));
+ strcpy((res_str + res_str_len), p1);
+ res_str_len = len;
+ }
+ *p = SPECIAL_VAR_SYMBOL;
+ inp = ++p;
+ done = 1;
+ }
+ if (done) {
+ res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
+ strcpy((res_str + res_str_len), inp);
+ while ((p = strchr(res_str, '\n'))) {
+ *p = ' ';
+ }
+ }
+ return (res_str == NULL) ? inp : res_str;
+}
+
+static char **make_list_in(char **inp, char *name)
+{
+ int len, i;
+ int name_len = strlen(name);
+ int n = 0;
+ char **list;
+ char *p1, *p2, *p3;
+
+ /* create list of variable values */
+ list = xmalloc(sizeof(*list));
+ for (i = 0; inp[i]; i++) {
+ p3 = insert_var_value(inp[i]);
+ p1 = p3;
+ while (*p1) {
+ if ((*p1 == ' ')) {
+ p1++;
+ continue;
+ }
+ if ((p2 = strchr(p1, ' '))) {
+ len = p2 - p1;
+ } else {
+ len = strlen(p1);
+ p2 = p1 + len;
+ }
+ /* we use n + 2 in realloc for list,because we add
+ * new element and then we will add NULL element */
+ list = xrealloc(list, sizeof(*list) * (n + 2));
+ list[n] = xmalloc(2 + name_len + len);
+ strcpy(list[n], name);
+ strcat(list[n], "=");
+ strncat(list[n], p1, len);
+ list[n++][name_len + len + 1] = '\0';
+ p1 = p2;
+ }
+ if (p3 != inp[i]) free(p3);
+ }
+ list[n] = NULL;
+ return list;
+}
+
+/* Make new string for parser */
+static char * make_string(char ** inp)
+{
+ char *p;
+ char *str = NULL;
+ int n;
+ int len = 2;
+
+ for (n = 0; inp[n]; n++) {
+ p = insert_var_value(inp[n]);
+ str = xrealloc(str, (len + strlen(p)));
+ if (n) {
+ strcat(str, " ");
+ } else {
+ *str = '\0';
+ }
+ strcat(str, p);
+ len = strlen(str) + 3;
+ if (p != inp[n]) free(p);
+ }
+ len = strlen(str);
+ *(str + len) = '\n';
+ *(str + len + 1) = '\0';
+ return str;
}
projects / oweals / busybox.git / blobdiff