mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-11-24 20:29:55 +00:00
hush: cleanup pass, the biggest is - moved builtins to the end of the file,
they really annoy in the middle of parser code. no real code changes.
This commit is contained in:
Denis Vlasenko
parent
b61e13d247
commit
c7985b76c5
711
shell/hush.c
711
shell/hush.c
@ -244,7 +244,6 @@ typedef enum {
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PIPE_BG = 4,
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} pipe_style;
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/* might eventually control execution */
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typedef enum {
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RES_NONE = 0,
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#if ENABLE_HUSH_IF
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@ -265,6 +264,7 @@ typedef enum {
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RES_XXXX = 12,
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RES_SNTX = 13
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} reserved_style;
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/* This holds pointers to the various results of parsing */
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struct p_context {
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struct child_prog *child;
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@ -298,6 +298,7 @@ struct child_prog {
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* and on execution these are substituted with their values.
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* Substitution can make _several_ words out of one argv[n]!
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* Example: argv[0]=='.^C*^C.' here: echo .$*.
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* References of the form ^C`cmd arg^C are `cmd arg` substitutions.
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*/
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struct pipe {
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@ -341,8 +342,8 @@ typedef struct {
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smallint nonnull;
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smallint has_empty_slot;
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} o_string;
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/* Used for initialization: o_string foo = NULL_O_STRING; */
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#define NULL_O_STRING { NULL }
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/* used for initialization: o_string foo = NULL_O_STRING; */
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/* I can almost use ordinary FILE *. Is open_memstream() universally
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* available? Where is it documented? */
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@ -572,7 +573,7 @@ static int glob_needed(const char *s)
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return 0;
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}
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static char **add_strings_to_strings(int need_xstrdup, char **strings, char **add)
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static char **add_malloced_strings_to_strings(char **strings, char **add)
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{
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int i;
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unsigned count1;
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@ -597,19 +598,18 @@ static char **add_strings_to_strings(int need_xstrdup, char **strings, char **ad
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v[count1 + count2] = NULL;
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i = count2;
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while (--i >= 0)
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v[count1 + i] = need_xstrdup ? xstrdup(add[i]) : add[i];
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v[count1 + i] = add[i];
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return v;
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}
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/* 'add' should be a malloced pointer */
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static char **add_string_to_strings(char **strings, char *add)
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static char **add_malloced_string_to_strings(char **strings, char *add)
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{
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char *v[2];
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v[0] = add;
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v[1] = NULL;
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return add_strings_to_strings(0, strings, v);
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return add_malloced_strings_to_strings(strings, v);
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}
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static void free_strings(char **strings)
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@ -713,6 +713,7 @@ static const struct built_in_command bltins[] = {
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#endif
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};
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/* Signals are grouped, we handle them in batches */
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static void set_misc_sighandler(void (*handler)(int))
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{
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@ -846,333 +847,6 @@ static const char *set_cwd(void)
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}
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/* built-in 'true' handler */
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static int builtin_true(char **argv ATTRIBUTE_UNUSED)
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{
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return 0;
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}
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/* built-in 'test' handler */
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static int builtin_test(char **argv)
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{
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int argc = 0;
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while (*argv) {
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argc++;
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argv++;
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}
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return test_main(argc, argv - argc);
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}
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/* built-in 'test' handler */
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static int builtin_echo(char **argv)
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{
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int argc = 0;
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while (*argv) {
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argc++;
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argv++;
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}
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return echo_main(argc, argv - argc);
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}
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/* built-in 'eval' handler */
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static int builtin_eval(char **argv)
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{
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int rcode = EXIT_SUCCESS;
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if (argv[1]) {
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char *str = expand_strvec_to_string(argv + 1);
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parse_and_run_string(str, PARSEFLAG_EXIT_FROM_LOOP);
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free(str);
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rcode = last_return_code;
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}
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return rcode;
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}
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/* built-in 'cd <path>' handler */
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static int builtin_cd(char **argv)
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{
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const char *newdir;
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if (argv[1] == NULL) {
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// bash does nothing (exitcode 0) if HOME is ""; if it's unset,
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// bash says "bash: cd: HOME not set" and does nothing (exitcode 1)
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newdir = getenv("HOME") ? : "/";
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} else
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newdir = argv[1];
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if (chdir(newdir)) {
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printf("cd: %s: %s\n", newdir, strerror(errno));
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return EXIT_FAILURE;
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}
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set_cwd();
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return EXIT_SUCCESS;
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}
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/* built-in 'exec' handler */
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static int builtin_exec(char **argv)
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{
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if (argv[1] == NULL)
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return EXIT_SUCCESS; /* bash does this */
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{
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#if !BB_MMU
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char **ptrs2free = alloc_ptrs(argv);
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#endif
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// FIXME: if exec fails, bash does NOT exit! We do...
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pseudo_exec_argv(ptrs2free, argv + 1);
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/* never returns */
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}
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}
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/* built-in 'exit' handler */
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static int builtin_exit(char **argv)
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{
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// TODO: bash does it ONLY on top-level sh exit (+interacive only?)
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//puts("exit"); /* bash does it */
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// TODO: warn if we have background jobs: "There are stopped jobs"
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// On second consecutive 'exit', exit anyway.
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if (argv[1] == NULL)
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hush_exit(last_return_code);
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/* mimic bash: exit 123abc == exit 255 + error msg */
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xfunc_error_retval = 255;
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/* bash: exit -2 == exit 254, no error msg */
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hush_exit(xatoi(argv[1]) & 0xff);
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}
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/* built-in 'export VAR=value' handler */
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static int builtin_export(char **argv)
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{
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const char *value;
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char *name = argv[1];
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if (name == NULL) {
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// TODO:
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// ash emits: export VAR='VAL'
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// bash: declare -x VAR="VAL"
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// (both also escape as needed (quotes, $, etc))
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char **e = environ;
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if (e)
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while (*e)
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puts(*e++);
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return EXIT_SUCCESS;
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}
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value = strchr(name, '=');
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if (!value) {
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/* They are exporting something without a =VALUE */
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struct variable *var;
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var = get_local_var(name);
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if (var) {
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var->flg_export = 1;
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putenv(var->varstr);
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}
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/* bash does not return an error when trying to export
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* an undefined variable. Do likewise. */
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return EXIT_SUCCESS;
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}
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set_local_var(xstrdup(name), 1);
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return EXIT_SUCCESS;
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}
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#if ENABLE_HUSH_JOB
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/* built-in 'fg' and 'bg' handler */
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static int builtin_fg_bg(char **argv)
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{
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int i, jobnum;
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struct pipe *pi;
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if (!interactive_fd)
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return EXIT_FAILURE;
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/* If they gave us no args, assume they want the last backgrounded task */
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if (!argv[1]) {
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for (pi = job_list; pi; pi = pi->next) {
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if (pi->jobid == last_jobid) {
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goto found;
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}
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}
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bb_error_msg("%s: no current job", argv[0]);
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return EXIT_FAILURE;
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}
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if (sscanf(argv[1], "%%%d", &jobnum) != 1) {
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bb_error_msg("%s: bad argument '%s'", argv[0], argv[1]);
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return EXIT_FAILURE;
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}
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for (pi = job_list; pi; pi = pi->next) {
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if (pi->jobid == jobnum) {
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goto found;
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}
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}
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bb_error_msg("%s: %d: no such job", argv[0], jobnum);
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return EXIT_FAILURE;
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found:
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// TODO: bash prints a string representation
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// of job being foregrounded (like "sleep 1 | cat")
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if (*argv[0] == 'f') {
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/* Put the job into the foreground. */
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tcsetpgrp(interactive_fd, pi->pgrp);
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}
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/* Restart the processes in the job */
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debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_progs, pi->pgrp);
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for (i = 0; i < pi->num_progs; i++) {
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debug_printf_jobs("reviving pid %d\n", pi->progs[i].pid);
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pi->progs[i].is_stopped = 0;
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}
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pi->stopped_progs = 0;
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i = kill(- pi->pgrp, SIGCONT);
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if (i < 0) {
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if (errno == ESRCH) {
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delete_finished_bg_job(pi);
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return EXIT_SUCCESS;
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} else {
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bb_perror_msg("kill (SIGCONT)");
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}
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}
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if (*argv[0] == 'f') {
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remove_bg_job(pi);
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return checkjobs_and_fg_shell(pi);
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}
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return EXIT_SUCCESS;
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}
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#endif
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/* built-in 'help' handler */
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#if ENABLE_HUSH_HELP
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static int builtin_help(char **argv ATTRIBUTE_UNUSED)
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{
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const struct built_in_command *x;
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printf("\nBuilt-in commands:\n");
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printf("-------------------\n");
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for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
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printf("%s\t%s\n", x->cmd, x->descr);
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}
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printf("\n\n");
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return EXIT_SUCCESS;
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}
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#endif
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#if ENABLE_HUSH_JOB
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/* built-in 'jobs' handler */
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static int builtin_jobs(char **argv ATTRIBUTE_UNUSED)
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{
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struct pipe *job;
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const char *status_string;
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for (job = job_list; job; job = job->next) {
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if (job->running_progs == job->stopped_progs)
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status_string = "Stopped";
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else
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status_string = "Running";
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printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext);
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}
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return EXIT_SUCCESS;
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}
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#endif
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/* built-in 'pwd' handler */
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static int builtin_pwd(char **argv ATTRIBUTE_UNUSED)
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{
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puts(set_cwd());
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return EXIT_SUCCESS;
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}
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/* built-in 'read VAR' handler */
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static int builtin_read(char **argv)
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{
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char *string;
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const char *name = argv[1] ? argv[1] : "REPLY";
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string = xmalloc_reads(STDIN_FILENO, xasprintf("%s=", name), NULL);
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return set_local_var(string, 0);
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}
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/* built-in 'set [VAR=value]' handler */
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static int builtin_set(char **argv)
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{
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char *temp = argv[1];
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struct variable *e;
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if (temp == NULL)
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for (e = top_var; e; e = e->next)
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puts(e->varstr);
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else
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set_local_var(xstrdup(temp), 0);
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return EXIT_SUCCESS;
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}
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/* Built-in 'shift' handler */
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static int builtin_shift(char **argv)
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{
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int n = 1;
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if (argv[1]) {
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n = atoi(argv[1]);
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}
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if (n >= 0 && n < global_argc) {
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global_argv[n] = global_argv[0];
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global_argc -= n;
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global_argv += n;
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return EXIT_SUCCESS;
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}
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return EXIT_FAILURE;
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}
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/* Built-in '.' handler (read-in and execute commands from file) */
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static int builtin_source(char **argv)
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{
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FILE *input;
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int status;
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if (argv[1] == NULL)
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return EXIT_FAILURE;
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/* XXX search through $PATH is missing */
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input = fopen(argv[1], "r");
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if (!input) {
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bb_error_msg("cannot open '%s'", argv[1]);
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return EXIT_FAILURE;
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}
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close_on_exec_on(fileno(input));
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/* Now run the file */
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/* XXX argv and argc are broken; need to save old global_argv
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* (pointer only is OK!) on this stack frame,
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* set global_argv=argv+1, recurse, and restore. */
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status = parse_and_run_file(input);
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fclose(input);
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return status;
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}
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static int builtin_umask(char **argv)
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{
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mode_t new_umask;
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const char *arg = argv[1];
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char *end;
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if (arg) {
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new_umask = strtoul(arg, &end, 8);
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if (*end != '\0' || end == arg) {
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return EXIT_FAILURE;
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}
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} else {
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new_umask = umask(0);
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printf("%.3o\n", (unsigned) new_umask);
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}
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umask(new_umask);
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return EXIT_SUCCESS;
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}
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/* built-in 'unset VAR' handler */
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static int builtin_unset(char **argv)
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{
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/* bash always returns true */
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unset_local_var(argv[1]);
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return EXIT_SUCCESS;
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}
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/*
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* o_string support
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*/
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@ -1282,7 +956,7 @@ static void o_addQstr(o_string *o, const char *str, int len)
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/* A special kind of o_string for $VAR and `cmd` expansion.
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* It contains char* list[] at the beginning, which is grown in 16 element
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* increments. Actual string data starts at the next multiple of 16.
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* increments. Actual string data starts at the next multiple of 16 * (char*).
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* list[i] contains an INDEX (int!) into this string data.
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* It means that if list[] needs to grow, data needs to be moved higher up
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* but list[i]'s need not be modified.
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@ -1355,7 +1029,8 @@ static int o_get_last_ptr(o_string *o, int n)
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return ((int)list[n-1]) + string_start;
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}
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/* Convert every \x to x in-place, return ptr past NUL. */
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/* o_glob performs globbing on last list[], saving each result
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* as a new list[]. unbackslash() is just a helper */
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static char *unbackslash(char *src)
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{
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char *dst = src;
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@ -1367,7 +1042,6 @@ static char *unbackslash(char *src)
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}
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return dst;
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}
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static int o_glob(o_string *o, int n)
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{
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glob_t globdata;
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@ -1416,8 +1090,8 @@ static int o_glob(o_string *o, int n)
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return n;
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}
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/* o_save_ptr_helper + but glob the string so far remembered
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* if o->o_glob == 1 */
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/* If o->o_glob == 1, glob the string so far remembered.
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* Otherwise, just finish current list[] and start new */
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static int o_save_ptr(o_string *o, int n)
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{
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if (o->o_glob)
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@ -1462,6 +1136,7 @@ static int static_peek(struct in_str *i)
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}
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#if ENABLE_HUSH_INTERACTIVE
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#if ENABLE_FEATURE_EDITING
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static void cmdedit_set_initial_prompt(void)
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{
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@ -1521,6 +1196,7 @@ static void get_user_input(struct in_str *i)
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#endif
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i->p = user_input_buf;
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}
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#endif /* INTERACTIVE */
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/* This is the magic location that prints prompts
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@ -1604,6 +1280,7 @@ static void setup_string_in_str(struct in_str *i, const char *s)
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i->eof_flag = 0;
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}
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/* squirrel != NULL means we squirrel away copies of stdin, stdout,
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* and stderr if they are redirected. */
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static int setup_redirects(struct child_prog *prog, int squirrel[])
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@ -1659,6 +1336,7 @@ static void restore_redirects(int squirrel[])
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}
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}
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|
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/* Called after [v]fork() in run_pipe(), or from builtin_exec().
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* Never returns.
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* XXX no exit() here. If you don't exec, use _exit instead.
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@ -2589,6 +2267,7 @@ static int run_and_free_list(struct pipe *pi)
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return rcode;
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}
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|
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/* expand_strvec_to_strvec() takes a list of strings, expands
|
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* all variable references within and returns a pointer to
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* a list of expanded strings, possibly with larger number
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||||
@ -2737,7 +2416,9 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
|
||||
} else
|
||||
val = lookup_param(arg);
|
||||
arg[0] = first_ch;
|
||||
#if ENABLE_HUSH_TICK
|
||||
store_val:
|
||||
#endif
|
||||
*p = SPECIAL_VAR_SYMBOL;
|
||||
if (!(first_ch & 0x80)) { /* unquoted $VAR */
|
||||
if (val) {
|
||||
@ -2801,7 +2482,7 @@ static char **expand_strvec_to_strvec(char **argv)
|
||||
return expand_variables(argv, 0x100);
|
||||
}
|
||||
|
||||
/* used for expansion of right hand of assignments */
|
||||
/* Used for expansion of right hand of assignments */
|
||||
/* NB: should NOT do globbing! "export v=/bin/c*; env | grep ^v=" outputs
|
||||
* "v=/bin/c*" */
|
||||
static char *expand_string_to_string(const char *str)
|
||||
@ -2820,7 +2501,7 @@ static char *expand_string_to_string(const char *str)
|
||||
return (char*)list;
|
||||
}
|
||||
|
||||
/* used for eval */
|
||||
/* Used for "eval" builtin */
|
||||
static char* expand_strvec_to_string(char **argv)
|
||||
{
|
||||
char **list;
|
||||
@ -2842,7 +2523,8 @@ static char* expand_strvec_to_string(char **argv)
|
||||
return (char*)list;
|
||||
}
|
||||
|
||||
/* This is used to get/check local shell variables */
|
||||
|
||||
/* Used to get/check local shell variables */
|
||||
static struct variable *get_local_var(const char *name)
|
||||
{
|
||||
struct variable *cur;
|
||||
@ -3099,12 +2781,16 @@ static int reserved_word(const o_string *word, struct p_context *ctx)
|
||||
continue;
|
||||
debug_printf("found reserved word %s, res %d\n", r->literal, r->res);
|
||||
if (r->flag == 0) { /* '!' */
|
||||
#if ENABLE_HUSH_LOOPS
|
||||
if (ctx->res_w == RES_IN) {
|
||||
/* 'for a in ! a b c; ...' - ! isn't a keyword here */
|
||||
break;
|
||||
}
|
||||
if (ctx->res_w == RES_FOR /* example: 'for ! a' */
|
||||
|| ctx->ctx_inverted /* bash doesn't accept '! ! true' */
|
||||
#endif
|
||||
if (ctx->ctx_inverted /* bash doesn't accept '! ! true' */
|
||||
#if ENABLE_HUSH_LOOPS
|
||||
|| ctx->res_w == RES_FOR /* example: 'for ! a' */
|
||||
#endif
|
||||
) {
|
||||
syntax(NULL);
|
||||
ctx->res_w = RES_SNTX;
|
||||
@ -3152,8 +2838,7 @@ static int reserved_word(const o_string *word, struct p_context *ctx)
|
||||
#endif
|
||||
|
||||
/* Word is complete, look at it and update parsing context.
|
||||
* Normal return is 0.
|
||||
* Syntax or xglob errors return 1. */
|
||||
* Normal return is 0. Syntax errors return 1. */
|
||||
static int done_word(o_string *word, struct p_context *ctx)
|
||||
{
|
||||
struct child_prog *child = ctx->child;
|
||||
@ -3184,7 +2869,7 @@ static int done_word(o_string *word, struct p_context *ctx)
|
||||
}
|
||||
|
||||
if (word->length || word->nonnull) {
|
||||
*glob_target = add_string_to_strings(*glob_target, xstrdup(word->data));
|
||||
*glob_target = add_malloced_string_to_strings(*glob_target, xstrdup(word->data));
|
||||
debug_print_strings("glob_target appended", *glob_target);
|
||||
}
|
||||
|
||||
@ -3282,9 +2967,9 @@ static void done_pipe(struct p_context *ctx, pipe_style type)
|
||||
debug_printf_parse("done_pipe return\n");
|
||||
}
|
||||
|
||||
/* peek ahead in the in_str to find out if we have a "&n" construct,
|
||||
/* Peek ahead in the in_str to find out if we have a "&n" construct,
|
||||
* as in "2>&1", that represents duplicating a file descriptor.
|
||||
* returns either -2 (syntax error), -1 (no &), or the number found.
|
||||
* Return either -2 (syntax error), -1 (no &), or the number found.
|
||||
*/
|
||||
static int redirect_dup_num(struct in_str *input)
|
||||
{
|
||||
@ -3395,7 +3080,7 @@ static int process_command_subs(o_string *dest,
|
||||
|
||||
initialize_context(&inner);
|
||||
|
||||
/* recursion to generate command */
|
||||
/* Recursion to generate command */
|
||||
retcode = parse_stream(&result, &inner, input, subst_end);
|
||||
if (retcode != 0)
|
||||
return retcode; /* syntax error or EOF */
|
||||
@ -3409,7 +3094,7 @@ static int process_command_subs(o_string *dest,
|
||||
close_on_exec_on(fileno(p));
|
||||
setup_file_in_str(&pipe_str, p);
|
||||
|
||||
/* now send results of command back into original context */
|
||||
/* Now send results of command back into original context */
|
||||
eol_cnt = 0;
|
||||
while ((ch = i_getch(&pipe_str)) != EOF) {
|
||||
if (ch == '\n') {
|
||||
@ -3596,7 +3281,7 @@ static void add_till_closing_curly_brace(o_string *dest, struct in_str *input)
|
||||
}
|
||||
#endif /* ENABLE_HUSH_TICK */
|
||||
|
||||
/* return code: 0 for OK, 1 for syntax error */
|
||||
/* Return code: 0 for OK, 1 for syntax error */
|
||||
static int handle_dollar(o_string *dest, struct in_str *input)
|
||||
{
|
||||
int ch = i_peek(input); /* first character after the $ */
|
||||
@ -3674,7 +3359,7 @@ static int handle_dollar(o_string *dest, struct in_str *input)
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* return code is 0 for normal exit, 1 for syntax error */
|
||||
/* Return code is 0 for normal exit, 1 for syntax error */
|
||||
static int parse_stream(o_string *dest, struct p_context *ctx,
|
||||
struct in_str *input, const char *end_trigger)
|
||||
{
|
||||
@ -3937,7 +3622,7 @@ static void update_charmap(void)
|
||||
set_in_charmap(ifs, CHAR_IFS); /* are ordinary if quoted */
|
||||
}
|
||||
|
||||
/* most recursion does not come through here, the exception is
|
||||
/* Most recursion does not come through here, the exception is
|
||||
* from builtin_source() and builtin_eval() */
|
||||
static int parse_and_run_stream(struct in_str *inp, int parse_flag)
|
||||
{
|
||||
@ -3975,7 +3660,9 @@ static int parse_and_run_stream(struct in_str *inp, int parse_flag)
|
||||
free_pipe_list(ctx.list_head, /* indent: */ 0);
|
||||
/* Discard all unprocessed line input, force prompt on */
|
||||
inp->p = NULL;
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
inp->promptme = 1;
|
||||
#endif
|
||||
}
|
||||
o_free(&temp);
|
||||
/* loop on syntax errors, return on EOF: */
|
||||
@ -4034,6 +3721,7 @@ static void setup_job_control(void)
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
int hush_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
||||
int hush_main(int argc, char **argv)
|
||||
{
|
||||
@ -4230,3 +3918,318 @@ int lash_main(int argc, char **argv)
|
||||
return hush_main(argc, argv);
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
/*
|
||||
* Built-ins
|
||||
*/
|
||||
static int builtin_true(char **argv ATTRIBUTE_UNUSED)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int builtin_test(char **argv)
|
||||
{
|
||||
int argc = 0;
|
||||
while (*argv) {
|
||||
argc++;
|
||||
argv++;
|
||||
}
|
||||
return test_main(argc, argv - argc);
|
||||
}
|
||||
|
||||
static int builtin_echo(char **argv)
|
||||
{
|
||||
int argc = 0;
|
||||
while (*argv) {
|
||||
argc++;
|
||||
argv++;
|
||||
}
|
||||
return echo_main(argc, argv - argc);
|
||||
}
|
||||
|
||||
static int builtin_eval(char **argv)
|
||||
{
|
||||
int rcode = EXIT_SUCCESS;
|
||||
|
||||
if (argv[1]) {
|
||||
char *str = expand_strvec_to_string(argv + 1);
|
||||
parse_and_run_string(str, PARSEFLAG_EXIT_FROM_LOOP);
|
||||
free(str);
|
||||
rcode = last_return_code;
|
||||
}
|
||||
return rcode;
|
||||
}
|
||||
|
||||
static int builtin_cd(char **argv)
|
||||
{
|
||||
const char *newdir;
|
||||
if (argv[1] == NULL) {
|
||||
// bash does nothing (exitcode 0) if HOME is ""; if it's unset,
|
||||
// bash says "bash: cd: HOME not set" and does nothing (exitcode 1)
|
||||
newdir = getenv("HOME") ? : "/";
|
||||
} else
|
||||
newdir = argv[1];
|
||||
if (chdir(newdir)) {
|
||||
printf("cd: %s: %s\n", newdir, strerror(errno));
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
set_cwd();
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
static int builtin_exec(char **argv)
|
||||
{
|
||||
if (argv[1] == NULL)
|
||||
return EXIT_SUCCESS; /* bash does this */
|
||||
{
|
||||
#if !BB_MMU
|
||||
char **ptrs2free = alloc_ptrs(argv);
|
||||
#endif
|
||||
// FIXME: if exec fails, bash does NOT exit! We do...
|
||||
pseudo_exec_argv(ptrs2free, argv + 1);
|
||||
/* never returns */
|
||||
}
|
||||
}
|
||||
|
||||
static int builtin_exit(char **argv)
|
||||
{
|
||||
// TODO: bash does it ONLY on top-level sh exit (+interacive only?)
|
||||
//puts("exit"); /* bash does it */
|
||||
// TODO: warn if we have background jobs: "There are stopped jobs"
|
||||
// On second consecutive 'exit', exit anyway.
|
||||
if (argv[1] == NULL)
|
||||
hush_exit(last_return_code);
|
||||
/* mimic bash: exit 123abc == exit 255 + error msg */
|
||||
xfunc_error_retval = 255;
|
||||
/* bash: exit -2 == exit 254, no error msg */
|
||||
hush_exit(xatoi(argv[1]) & 0xff);
|
||||
}
|
||||
|
||||
static int builtin_export(char **argv)
|
||||
{
|
||||
const char *value;
|
||||
char *name = argv[1];
|
||||
|
||||
if (name == NULL) {
|
||||
// TODO:
|
||||
// ash emits: export VAR='VAL'
|
||||
// bash: declare -x VAR="VAL"
|
||||
// (both also escape as needed (quotes, $, etc))
|
||||
char **e = environ;
|
||||
if (e)
|
||||
while (*e)
|
||||
puts(*e++);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
value = strchr(name, '=');
|
||||
if (!value) {
|
||||
/* They are exporting something without a =VALUE */
|
||||
struct variable *var;
|
||||
|
||||
var = get_local_var(name);
|
||||
if (var) {
|
||||
var->flg_export = 1;
|
||||
putenv(var->varstr);
|
||||
}
|
||||
/* bash does not return an error when trying to export
|
||||
* an undefined variable. Do likewise. */
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
set_local_var(xstrdup(name), 1);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
#if ENABLE_HUSH_JOB
|
||||
/* built-in 'fg' and 'bg' handler */
|
||||
static int builtin_fg_bg(char **argv)
|
||||
{
|
||||
int i, jobnum;
|
||||
struct pipe *pi;
|
||||
|
||||
if (!interactive_fd)
|
||||
return EXIT_FAILURE;
|
||||
/* If they gave us no args, assume they want the last backgrounded task */
|
||||
if (!argv[1]) {
|
||||
for (pi = job_list; pi; pi = pi->next) {
|
||||
if (pi->jobid == last_jobid) {
|
||||
goto found;
|
||||
}
|
||||
}
|
||||
bb_error_msg("%s: no current job", argv[0]);
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
if (sscanf(argv[1], "%%%d", &jobnum) != 1) {
|
||||
bb_error_msg("%s: bad argument '%s'", argv[0], argv[1]);
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
for (pi = job_list; pi; pi = pi->next) {
|
||||
if (pi->jobid == jobnum) {
|
||||
goto found;
|
||||
}
|
||||
}
|
||||
bb_error_msg("%s: %d: no such job", argv[0], jobnum);
|
||||
return EXIT_FAILURE;
|
||||
found:
|
||||
// TODO: bash prints a string representation
|
||||
// of job being foregrounded (like "sleep 1 | cat")
|
||||
if (*argv[0] == 'f') {
|
||||
/* Put the job into the foreground. */
|
||||
tcsetpgrp(interactive_fd, pi->pgrp);
|
||||
}
|
||||
|
||||
/* Restart the processes in the job */
|
||||
debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_progs, pi->pgrp);
|
||||
for (i = 0; i < pi->num_progs; i++) {
|
||||
debug_printf_jobs("reviving pid %d\n", pi->progs[i].pid);
|
||||
pi->progs[i].is_stopped = 0;
|
||||
}
|
||||
pi->stopped_progs = 0;
|
||||
|
||||
i = kill(- pi->pgrp, SIGCONT);
|
||||
if (i < 0) {
|
||||
if (errno == ESRCH) {
|
||||
delete_finished_bg_job(pi);
|
||||
return EXIT_SUCCESS;
|
||||
} else {
|
||||
bb_perror_msg("kill (SIGCONT)");
|
||||
}
|
||||
}
|
||||
|
||||
if (*argv[0] == 'f') {
|
||||
remove_bg_job(pi);
|
||||
return checkjobs_and_fg_shell(pi);
|
||||
}
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
#endif
|
||||
|
||||
#if ENABLE_HUSH_HELP
|
||||
static int builtin_help(char **argv ATTRIBUTE_UNUSED)
|
||||
{
|
||||
const struct built_in_command *x;
|
||||
|
||||
printf("\nBuilt-in commands:\n");
|
||||
printf("-------------------\n");
|
||||
for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
|
||||
printf("%s\t%s\n", x->cmd, x->descr);
|
||||
}
|
||||
printf("\n\n");
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
#endif
|
||||
|
||||
#if ENABLE_HUSH_JOB
|
||||
static int builtin_jobs(char **argv ATTRIBUTE_UNUSED)
|
||||
{
|
||||
struct pipe *job;
|
||||
const char *status_string;
|
||||
|
||||
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->cmdtext);
|
||||
}
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
#endif
|
||||
|
||||
static int builtin_pwd(char **argv ATTRIBUTE_UNUSED)
|
||||
{
|
||||
puts(set_cwd());
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
static int builtin_read(char **argv)
|
||||
{
|
||||
char *string;
|
||||
const char *name = argv[1] ? argv[1] : "REPLY";
|
||||
|
||||
string = xmalloc_reads(STDIN_FILENO, xasprintf("%s=", name), NULL);
|
||||
return set_local_var(string, 0);
|
||||
}
|
||||
|
||||
/* built-in 'set [VAR=value]' handler */
|
||||
static int builtin_set(char **argv)
|
||||
{
|
||||
char *temp = argv[1];
|
||||
struct variable *e;
|
||||
|
||||
if (temp == NULL)
|
||||
for (e = top_var; e; e = e->next)
|
||||
puts(e->varstr);
|
||||
else
|
||||
set_local_var(xstrdup(temp), 0);
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
static int builtin_shift(char **argv)
|
||||
{
|
||||
int n = 1;
|
||||
if (argv[1]) {
|
||||
n = atoi(argv[1]);
|
||||
}
|
||||
if (n >= 0 && n < global_argc) {
|
||||
global_argv[n] = global_argv[0];
|
||||
global_argc -= n;
|
||||
global_argv += n;
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
static int builtin_source(char **argv)
|
||||
{
|
||||
FILE *input;
|
||||
int status;
|
||||
|
||||
if (argv[1] == NULL)
|
||||
return EXIT_FAILURE;
|
||||
|
||||
/* XXX search through $PATH is missing */
|
||||
input = fopen(argv[1], "r");
|
||||
if (!input) {
|
||||
bb_error_msg("cannot open '%s'", argv[1]);
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
close_on_exec_on(fileno(input));
|
||||
|
||||
/* Now run the file */
|
||||
/* XXX argv and argc are broken; need to save old global_argv
|
||||
* (pointer only is OK!) on this stack frame,
|
||||
* set global_argv=argv+1, recurse, and restore. */
|
||||
status = parse_and_run_file(input);
|
||||
fclose(input);
|
||||
return status;
|
||||
}
|
||||
|
||||
static int builtin_umask(char **argv)
|
||||
{
|
||||
mode_t new_umask;
|
||||
const char *arg = argv[1];
|
||||
char *end;
|
||||
if (arg) {
|
||||
new_umask = strtoul(arg, &end, 8);
|
||||
if (*end != '\0' || end == arg) {
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
} else {
|
||||
new_umask = umask(0);
|
||||
printf("%.3o\n", (unsigned) new_umask);
|
||||
}
|
||||
umask(new_umask);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
static int builtin_unset(char **argv)
|
||||
{
|
||||
/* bash always returns true */
|
||||
unset_local_var(argv[1]);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
@ -8,6 +8,6 @@ freelist=`grep 'free 0x' "$output" | cut -d' ' -f2 | sort | uniq | xargs`
|
||||
grep -v free "$output" >temp1
|
||||
for freed in $freelist; do
|
||||
echo Dropping $freed
|
||||
cat temp1 | grep -v $freed >temp2
|
||||
grep -v $freed <temp1 >temp2
|
||||
mv temp2 temp1
|
||||
done
|
||||
|
||||
Loading…
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