+++ /dev/null
-/* vi: set ts=4 :
- *
- * bbsh - busybox shell
- *
- * Copyright 2006 Rob Landley <rob@landley.net>
- *
- * Licensed under GPLv2 or later, see file LICENSE in this source tree.
- */
-
-// A section of code that gets repeatedly or conditionally executed is stored
-// as a string and parsed each time it's run.
-
-
-
-// Wheee, debugging.
-
-// Terminal control
-#define ENABLE_BBSH_TTY 0
-
-// &, fg, bg, jobs. (ctrl-z with tty.)
-#define ENABLE_BBSH_JOBCTL 0
-
-// Flow control (if, while, for, functions { })
-#define ENABLE_BBSH_FLOWCTL 0
-
-#define ENABLE_BBSH_ENVVARS 0 // Environment variable support
-
-// Local and synthetic variables, fancy prompts, set, $?, etc.
-#define ENABLE_BBSH_LOCALVARS 0
-
-// Pipes and redirects: | > < >> << && || & () ;
-#define ENABLE_BBSH_PIPES 0
-
-/* Fun:
-
- echo `echo hello#comment " woot` and more
-*/
-
-#include "libbb.h"
-
-// A single executable, its arguments, and other information we know about it.
-#define BBSH_FLAG_EXIT 1
-#define BBSH_FLAG_SUSPEND 2
-#define BBSH_FLAG_PIPE 4
-#define BBSH_FLAG_AND 8
-#define BBSH_FLAG_OR 16
-#define BBSH_FLAG_AMP 32
-#define BBSH_FLAG_SEMI 64
-#define BBSH_FLAG_PAREN 128
-
-// What we know about a single process.
-struct command {
- struct command *next;
- int flags; // exit, suspend, && ||
- int pid; // pid (or exit code)
- int argc;
- char *argv[];
-};
-
-// A collection of processes piped into/waiting on each other.
-struct pipeline {
- struct pipeline *next;
- int job_id;
- struct command *cmd;
- char *cmdline;
- int cmdlinelen;
-};
-
-static void free_list(void *list, void (*freeit)(void *data))
-{
- while (list) {
- void **next = (void **)list;
- void *list_next = *next;
- freeit(list);
- free(list);
- list = list_next;
- }
-}
-
-// Parse one word from the command line, appending one or more argv[] entries
-// to struct command. Handles environment variable substitution and
-// substrings. Returns pointer to next used byte, or NULL if it
-// hit an ending token.
-static char *parse_word(char *start, struct command **cmd)
-{
- char *end;
-
- // Detect end of line (and truncate line at comment)
- if (ENABLE_BBSH_PIPES && strchr("><&|(;", *start)) return 0;
-
- // Grab next word. (Add dequote and envvar logic here)
- end = start;
- end = skip_non_whitespace(end);
- (*cmd)->argv[(*cmd)->argc++] = xstrndup(start, end-start);
-
- // Allocate more space if there's no room for NULL terminator.
-
- if (!((*cmd)->argc & 7))
- *cmd = xrealloc(*cmd,
- sizeof(struct command) + ((*cmd)->argc+8)*sizeof(char *));
- (*cmd)->argv[(*cmd)->argc] = 0;
- return end;
-}
-
-// Parse a line of text into a pipeline.
-// Returns a pointer to the next line.
-
-static char *parse_pipeline(char *cmdline, struct pipeline *line)
-{
- struct command **cmd = &(line->cmd);
- char *start = line->cmdline = cmdline;
-
- if (!cmdline) return 0;
-
- if (ENABLE_BBSH_JOBCTL) line->cmdline = cmdline;
-
- // Parse command into argv[]
- for (;;) {
- char *end;
-
- // Skip leading whitespace and detect end of line.
- start = skip_whitespace(start);
- if (!*start || *start=='#') {
- if (ENABLE_BBSH_JOBCTL) line->cmdlinelen = start-cmdline;
- return 0;
- }
-
- // Allocate next command structure if necessary
- if (!*cmd) *cmd = xzalloc(sizeof(struct command)+8*sizeof(char *));
-
- // Parse next argument and add the results to argv[]
- end = parse_word(start, cmd);
-
- // If we hit the end of this command, how did it end?
- if (!end) {
- if (ENABLE_BBSH_PIPES && *start) {
- if (*start==';') {
- start++;
- break;
- }
- // handle | & < > >> << || &&
- }
- break;
- }
- start = end;
- }
-
- if (ENABLE_BBSH_JOBCTL) line->cmdlinelen = start-cmdline;
-
- return start;
-}
-
-// Execute the commands in a pipeline
-static int run_pipeline(struct pipeline *line)
-{
- struct command *cmd = line->cmd;
- if (!cmd || !cmd->argc) return 0;
-
- // Handle local commands. This is totally fake and plastic.
- if (cmd->argc==2 && !strcmp(cmd->argv[0],"cd"))
- chdir(cmd->argv[1]);
- else if (!strcmp(cmd->argv[0],"exit"))
- exit(cmd->argc>1 ? atoi(cmd->argv[1]) : 0);
- else {
- int status;
- pid_t pid=fork();
- if (!pid) {
- run_applet_and_exit(cmd->argv[0],cmd->argc,cmd->argv);
- execvp(cmd->argv[0],cmd->argv);
- printf("No %s", cmd->argv[0]);
- exit(EXIT_FAILURE);
- } else waitpid(pid, &status, 0);
- }
-
- return 0;
-}
-
-static void free_cmd(void *data)
-{
- struct command *cmd=(struct command *)data;
-
- while (cmd->argc) free(cmd->argv[--cmd->argc]);
-}
-
-
-static void handle(char *command)
-{
- struct pipeline line;
- char *start = command;
-
- for (;;) {
- memset(&line,0,sizeof(struct pipeline));
- start = parse_pipeline(start, &line);
- if (!line.cmd) break;
-
- run_pipeline(&line);
- free_list(line.cmd, free_cmd);
- }
-}
-
-int bbsh_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int bbsh_main(int argc UNUSED_PARAM, char **argv)
-{
- char *command=NULL;
- FILE *f;
-
- getopt32(argv, "c:", &command);
-
- f = argv[optind] ? xfopen_for_read(argv[optind]) : NULL;
- if (command) handle(command);
- else {
- unsigned cmdlen=0;
- for (;;) {
- if (!f) putchar('$');
- if (1 > getline(&command, &cmdlen, f ? f : stdin)) break;
-
- handle(command);
- }
- if (ENABLE_FEATURE_CLEAN_UP) free(command);
- }
-
- return 1;
-}
//applet:IF_HUSH(APPLET(hush, _BB_DIR_BIN, _BB_SUID_DROP))
//applet:IF_MSH(APPLET(msh, _BB_DIR_BIN, _BB_SUID_DROP))
-//applet:IF_LASH(APPLET(lash, _BB_DIR_BIN, _BB_SUID_DROP))
//applet:IF_FEATURE_SH_IS_HUSH(APPLET_ODDNAME(sh, hush, _BB_DIR_BIN, _BB_SUID_DROP, sh))
//applet:IF_FEATURE_BASH_IS_HUSH(APPLET_ODDNAME(bash, hush, _BB_DIR_BIN, _BB_SUID_DROP, bash))
//config: This instructs hush to print commands before execution.
//config: Adds ~300 bytes.
//config:
-//config:config LASH
-//config: bool "lash (deprecated: aliased to hush)"
-//config: default n
-//config: select HUSH
-//config: help
-//config: lash is deprecated and will be removed, please migrate to hush.
-//config:
//config:config MSH
//config: bool "msh (deprecated: aliased to hush)"
//config: default n
//usage:#define hush_trivial_usage NOUSAGE_STR
//usage:#define hush_full_usage ""
-//usage:#define lash_trivial_usage NOUSAGE_STR
-//usage:#define lash_full_usage ""
//usage:#define msh_trivial_usage NOUSAGE_STR
//usage:#define msh_full_usage ""
}
-#if ENABLE_LASH
-int lash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int lash_main(int argc, char **argv)
-{
- bb_error_msg("lash is deprecated, please use hush instead");
- return hush_main(argc, argv);
-}
-#endif
-
#if ENABLE_MSH
int msh_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int msh_main(int argc, char **argv)
projects / platform / upstream / busybox.git / commitdiff