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https://github.com/sheumann/hush.git
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hush: a few relatively trivial simplifications
function old new delta helper_export_local 130 135 +5 set_vars_and_save_old 89 85 -4 expand_variables 147 141 -6 get_ptr_to_local_var 77 70 -7 get_local_var_value 171 164 -7 delete_finished_bg_job 31 16 -15 hush_exit 101 84 -17 free_pipe_list 31 12 -19 check_and_run_traps 232 205 -27 free_pipe 205 130 -75 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/9 up/down: 5/-177) Total: -172 bytes Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Denys Vlasenko
parent
da463fb007
commit
27c56f1267
111
shell/hush.c
111
shell/hush.c
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@ -1344,11 +1344,14 @@ static void hush_exit(int exitcode)
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/* Prevent recursion:
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* trap "echo Hi; exit" EXIT; exit
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*/
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char *argv[] = { NULL, G.traps[0], NULL };
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char *argv[3];
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/* argv[0] is unused */
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argv[1] = G.traps[0];
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argv[2] = NULL;
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G.traps[0] = NULL;
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G.exiting = 1;
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builtin_eval(argv);
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free(argv[1]);
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/* free(argv[1]); - why bother */
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}
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#if ENABLE_HUSH_JOB
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@ -1376,10 +1379,12 @@ static int check_and_run_traps(int sig)
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if (G.traps && G.traps[sig]) {
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if (G.traps[sig][0]) {
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/* We have user-defined handler */
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char *argv[] = { NULL, xstrdup(G.traps[sig]), NULL };
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char *argv[3];
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/* argv[0] is unused */
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argv[1] = G.traps[sig];
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argv[2] = NULL;
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save_rcode = G.last_exitcode;
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builtin_eval(argv);
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free(argv[1]);
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G.last_exitcode = save_rcode;
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} /* else: "" trap, ignoring signal */
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continue;
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@ -1439,13 +1444,11 @@ static const char *get_cwd(int force)
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/*
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* Shell and environment variable support
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*/
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static struct variable **get_ptr_to_local_var(const char *name)
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static struct variable **get_ptr_to_local_var(const char *name, unsigned len)
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{
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struct variable **pp;
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struct variable *cur;
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int len;
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len = strlen(name);
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pp = &G.top_var;
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while ((cur = *pp) != NULL) {
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if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
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@ -1455,21 +1458,13 @@ static struct variable **get_ptr_to_local_var(const char *name)
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return NULL;
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}
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static struct variable *get_local_var(const char *name)
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{
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struct variable **pp = get_ptr_to_local_var(name);
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if (pp)
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return *pp;
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return NULL;
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}
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static const char* FAST_FUNC get_local_var_value(const char *name)
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{
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struct variable **vpp;
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unsigned len = strlen(name);
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if (G.expanded_assignments) {
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char **cpp = G.expanded_assignments;
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int len = strlen(name);
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while (*cpp) {
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char *cp = *cpp;
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if (strncmp(cp, name, len) == 0 && cp[len] == '=')
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@ -1478,17 +1473,16 @@ static const char* FAST_FUNC get_local_var_value(const char *name)
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}
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}
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vpp = get_ptr_to_local_var(name);
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vpp = get_ptr_to_local_var(name, len);
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if (vpp)
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return strchr((*vpp)->varstr, '=') + 1;
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return (*vpp)->varstr + len + 1;
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if (strcmp(name, "PPID") == 0)
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return utoa(G.root_ppid);
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// bash compat: UID? EUID?
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#if ENABLE_HUSH_RANDOM_SUPPORT
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if (strcmp(name, "RANDOM") == 0) {
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if (strcmp(name, "RANDOM") == 0)
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return utoa(next_random(&G.random_gen));
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}
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#endif
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return NULL;
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}
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@ -1738,9 +1732,7 @@ static struct variable *set_vars_and_save_old(char **strings)
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eq = strchr(*s, '=');
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if (eq) {
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*eq = '\0';
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var_pp = get_ptr_to_local_var(*s);
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*eq = '=';
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var_pp = get_ptr_to_local_var(*s, eq - *s);
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if (var_pp) {
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/* Remove variable from global linked list */
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var_p = *var_pp;
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@ -2500,33 +2492,36 @@ static char **o_finalize_list(o_string *o, int n)
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list[--n] = NULL;
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while (n) {
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n--;
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list[n] = o->data + (int)(ptrdiff_t)list[n] + string_start;
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list[n] = o->data + (int)(uintptr_t)list[n] + string_start;
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}
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return list;
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}
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static void free_pipe_list(struct pipe *head);
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static void free_pipe_list(struct pipe *pi);
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/* Return code is the exit status of the pipe */
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static void free_pipe(struct pipe *pi)
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/* Returns pi->next - next pipe in the list */
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static struct pipe *free_pipe(struct pipe *pi)
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{
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char **p;
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struct command *command;
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struct redir_struct *r, *rnext;
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int a, i;
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struct pipe *next;
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int i;
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if (pi->stopped_cmds > 0) /* why? */
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return;
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debug_printf_clean("run pipe: (pid %d)\n", getpid());
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debug_printf_clean("free_pipe (pid %d)\n", getpid());
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for (i = 0; i < pi->num_cmds; i++) {
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struct command *command;
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struct redir_struct *r, *rnext;
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command = &pi->cmds[i];
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debug_printf_clean(" command %d:\n", i);
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if (command->argv) {
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for (a = 0, p = command->argv; *p; a++, p++) {
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debug_printf_clean(" argv[%d] = %s\n", a, *p);
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if (DEBUG_CLEAN) {
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int a;
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char **p;
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for (a = 0, p = command->argv; *p; a++, p++) {
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debug_printf_clean(" argv[%d] = %s\n", a, *p);
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}
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}
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free_strings(command->argv);
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command->argv = NULL;
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//command->argv = NULL;
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}
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/* not "else if": on syntax error, we may have both! */
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if (command->group) {
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@ -2534,7 +2529,7 @@ static void free_pipe(struct pipe *pi)
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command->cmd_type);
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free_pipe_list(command->group);
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debug_printf_clean(" end group\n");
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command->group = NULL;
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//command->group = NULL;
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}
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/* else is crucial here.
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* If group != NULL, child_func is meaningless */
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@ -2546,7 +2541,7 @@ static void free_pipe(struct pipe *pi)
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#endif
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#if !BB_MMU
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free(command->group_as_string);
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command->group_as_string = NULL;
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//command->group_as_string = NULL;
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#endif
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for (r = command->redirects; r; r = rnext) {
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debug_printf_clean(" redirect %d%s",
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@ -2555,35 +2550,34 @@ static void free_pipe(struct pipe *pi)
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if (r->rd_filename) {
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debug_printf_clean(" fname:'%s'\n", r->rd_filename);
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free(r->rd_filename);
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r->rd_filename = NULL;
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//r->rd_filename = NULL;
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}
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debug_printf_clean(" rd_dup:%d\n", r->rd_dup);
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rnext = r->next;
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free(r);
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}
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command->redirects = NULL;
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//command->redirects = NULL;
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}
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free(pi->cmds); /* children are an array, they get freed all at once */
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pi->cmds = NULL;
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//pi->cmds = NULL;
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#if ENABLE_HUSH_JOB
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free(pi->cmdtext);
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pi->cmdtext = NULL;
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//pi->cmdtext = NULL;
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#endif
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next = pi->next;
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free(pi);
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return next;
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}
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static void free_pipe_list(struct pipe *head)
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static void free_pipe_list(struct pipe *pi)
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{
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struct pipe *pi, *next;
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for (pi = head; pi; pi = next) {
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while (pi) {
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#if HAS_KEYWORDS
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debug_printf_clean(" pipe reserved word %d\n", pi->res_word);
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debug_printf_clean("pipe reserved word %d\n", pi->res_word);
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#endif
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free_pipe(pi);
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debug_printf_clean("pipe followup code %d\n", pi->followup);
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next = pi->next;
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/*pi->next = NULL;*/
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free(pi);
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pi = free_pipe(pi);
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}
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}
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@ -6184,15 +6178,13 @@ static void remove_bg_job(struct pipe *pi)
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static void delete_finished_bg_job(struct pipe *pi)
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{
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remove_bg_job(pi);
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pi->stopped_cmds = 0;
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free_pipe(pi);
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free(pi);
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}
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#endif /* JOB */
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/* Check to see if any processes have exited -- if they
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* have, figure out why and see if a job has completed */
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static int checkjobs(struct pipe* fg_pipe)
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static int checkjobs(struct pipe *fg_pipe)
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{
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int attributes;
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int status;
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@ -7879,13 +7871,16 @@ static void helper_export_local(char **argv, int exp, int lvl)
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{
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do {
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char *name = *argv;
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char *name_end = strchrnul(name, '=');
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/* So far we do not check that name is valid (TODO?) */
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if (strchr(name, '=') == NULL) {
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struct variable *var;
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if (*name_end == '\0') {
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struct variable *var, **vpp;
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vpp = get_ptr_to_local_var(name, name_end - name);
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var = vpp ? *vpp : NULL;
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var = get_local_var(name);
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if (exp == -1) { /* unexporting? */
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/* export -n NAME (without =VALUE) */
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if (var) {
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