diff options
Diffstat (limited to 'shell/hush.c')
| -rw-r--r-- | shell/hush.c | 155 |
1 files changed, 147 insertions, 8 deletions
diff --git a/shell/hush.c b/shell/hush.c index 7640bd6ba..c67aebdd7 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -101,6 +101,136 @@ # define PIPE_BUF 4096 /* amount of buffering in a pipe */ #endif +//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)) + +//kbuild:lib-$(CONFIG_HUSH) += hush.o match.o shell_common.o +//kbuild:lib-$(CONFIG_HUSH_RANDOM_SUPPORT) += random.o + +//config:config HUSH +//config: bool "hush" +//config: default y +//config: help +//config: hush is a small shell (22k). It handles the normal flow control +//config: constructs such as if/then/elif/else/fi, for/in/do/done, while loops, +//config: case/esac. Redirections, here documents, $((arithmetic)) +//config: and functions are supported. +//config: +//config: It will compile and work on no-mmu systems. +//config: +//config: It does not handle select, aliases, brace expansion, +//config: tilde expansion, &>file and >&file redirection of stdout+stderr. +//config: +//config:config HUSH_BASH_COMPAT +//config: bool "bash-compatible extensions" +//config: default y +//config: depends on HUSH +//config: help +//config: Enable bash-compatible extensions. +//config: +//config:config HUSH_HELP +//config: bool "help builtin" +//config: default y +//config: depends on HUSH +//config: help +//config: Enable help builtin in hush. Code size + ~1 kbyte. +//config: +//config:config HUSH_INTERACTIVE +//config: bool "Interactive mode" +//config: default y +//config: depends on HUSH +//config: help +//config: Enable interactive mode (prompt and command editing). +//config: Without this, hush simply reads and executes commands +//config: from stdin just like a shell script from a file. +//config: No prompt, no PS1/PS2 magic shell variables. +//config: +//config:config HUSH_JOB +//config: bool "Job control" +//config: default y +//config: depends on HUSH_INTERACTIVE +//config: help +//config: Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current +//config: command (not entire shell), fg/bg builtins work. Without this option, +//config: "cmd &" still works by simply spawning a process and immediately +//config: prompting for next command (or executing next command in a script), +//config: but no separate process group is formed. +//config: +//config:config HUSH_TICK +//config: bool "Process substitution" +//config: default y +//config: depends on HUSH +//config: help +//config: Enable process substitution `command` and $(command) in hush. +//config: +//config:config HUSH_IF +//config: bool "Support if/then/elif/else/fi" +//config: default y +//config: depends on HUSH +//config: help +//config: Enable if/then/elif/else/fi in hush. +//config: +//config:config HUSH_LOOPS +//config: bool "Support for, while and until loops" +//config: default y +//config: depends on HUSH +//config: help +//config: Enable for, while and until loops in hush. +//config: +//config:config HUSH_CASE +//config: bool "Support case ... esac statement" +//config: default y +//config: depends on HUSH +//config: help +//config: Enable case ... esac statement in hush. +400 bytes. +//config: +//config:config HUSH_FUNCTIONS +//config: bool "Support funcname() { commands; } syntax" +//config: default y +//config: depends on HUSH +//config: help +//config: Enable support for shell functions in hush. +800 bytes. +//config: +//config:config HUSH_LOCAL +//config: bool "Support local builtin" +//config: default y +//config: depends on HUSH_FUNCTIONS +//config: help +//config: Enable support for local variables in functions. +//config: +//config:config HUSH_RANDOM_SUPPORT +//config: bool "Pseudorandom generator and $RANDOM variable" +//config: default y +//config: depends on HUSH +//config: help +//config: Enable pseudorandom generator and dynamic variable "$RANDOM". +//config: Each read of "$RANDOM" will generate a new pseudorandom value. +//config: +//config:config HUSH_EXPORT_N +//config: bool "Support 'export -n' option" +//config: default y +//config: depends on HUSH +//config: help +//config: export -n unexports variables. It is a bash extension. +//config: +//config:config HUSH_MODE_X +//config: bool "Support 'hush -x' option and 'set -x' command" +//config: default y +//config: depends on HUSH +//config: help +//config: This instructs hush to print commands before execution. Adds ~300 bytes. +//config: + +//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 "" + /* Build knobs */ #define LEAK_HUNTING 0 @@ -531,8 +661,13 @@ struct globals { */ smallint flag_return_in_progress; #endif - smallint fake_mode; + smallint n_mode; +#if ENABLE_HUSH_MODE_X smallint x_mode; +# define G_x_mode G.x_mode +#else +# define G_x_mode 0 +#endif smallint exiting; /* used to prevent EXIT trap recursion */ /* These four support $?, $#, and $1 */ smalluint last_exitcode; @@ -3693,9 +3828,10 @@ static void execvp_or_die(char **argv) _exit(127); /* bash compat */ } +#if ENABLE_HUSH_MODE_X static void dump_cmd_in_x_mode(char **argv) { - if (G.x_mode && argv) { + if (G_x_mode && argv) { /* We want to output the line in one write op */ char *buf, *p; int len; @@ -3717,6 +3853,9 @@ static void dump_cmd_in_x_mode(char **argv) free(buf); } } +#else +# define dump_cmd_in_x_mode(argv) ((void)0) +#endif #if BB_MMU #define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \ @@ -4267,18 +4406,18 @@ static NOINLINE int run_pipe(struct pipe *pi) rcode = setup_redirects(command, squirrel); restore_redirects(squirrel); /* Set shell variables */ - if (G.x_mode) + if (G_x_mode) bb_putchar_stderr('+'); while (*argv) { p = expand_string_to_string(*argv); - if (G.x_mode) + if (G_x_mode) fprintf(stderr, " %s", p); debug_printf_exec("set shell var:'%s'->'%s'\n", *argv, p); set_local_var(p, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0); argv++; } - if (G.x_mode) + if (G_x_mode) bb_putchar_stderr('\n'); /* Redirect error sets $? to 1. Otherwise, * if evaluating assignment value set $?, retain it. @@ -4943,7 +5082,7 @@ static int run_and_free_list(struct pipe *pi) { int rcode = 0; debug_printf_exec("run_and_free_list entered\n"); - if (!G.fake_mode) { + if (!G.n_mode) { debug_printf_exec(": run_list: 1st pipe with %d cmds\n", pi->num_cmds); rcode = run_list(pi); } @@ -6969,8 +7108,8 @@ static int set_mode(const char cstate, const char mode) { int state = (cstate == '-' ? 1 : 0); switch (mode) { - case 'n': G.fake_mode = state; break; - case 'x': G.x_mode = state; break; + case 'n': G.n_mode = state; break; + case 'x': IF_HUSH_MODE_X(G_x_mode = state;) break; default: return EXIT_FAILURE; } return EXIT_SUCCESS; |