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https://github.com/sheumann/hush.git
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hush: deal with a TODO: move argv_from_re_execing out of globals
function old new delta generate_stream_from_string 156 165 +9 setup_heredoc 312 320 +8 re_execute_shell 387 391 +4 pseudo_exec_argv 129 133 +4 run_pipe 1790 1783 -7 clean_up_after_re_execute 30 - -30 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 4/1 up/down: 25/-37) Total: -12 bytes
This commit is contained in:
Denis Vlasenko
parent
c3587223c7
commit
27014ed5cb
66
shell/hush.c
66
shell/hush.c
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@ -155,6 +155,7 @@ typedef struct nommu_save_t {
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char **new_env;
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char **old_env;
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char **argv;
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char **argv_from_re_execing;
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} nommu_save_t;
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#endif
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@ -449,7 +450,6 @@ struct globals {
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char **global_argv;
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#if !BB_MMU
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char *argv0_for_re_execing;
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char **argv_from_re_execing;
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#endif
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#if ENABLE_HUSH_LOOPS
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unsigned depth_break_continue;
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@ -2280,9 +2280,7 @@ static char **expand_assignments(char **argv, int count)
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#if BB_MMU
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/* never called */
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void re_execute_shell(const char *s, char *argv0, char **argv);
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#define clean_up_after_re_execute() ((void)0)
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void re_execute_shell(char ***to_free, const char *s, char *argv0, char **argv);
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static void reset_traps_to_defaults(void)
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{
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@ -2314,8 +2312,8 @@ static void reset_traps_to_defaults(void)
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#else /* !BB_MMU */
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static void re_execute_shell(const char *s, char *g_argv0, char **g_argv) NORETURN;
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static void re_execute_shell(const char *s, char *g_argv0, char **g_argv)
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static void re_execute_shell(char ***to_free, const char *s, char *g_argv0, char **g_argv) NORETURN;
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static void re_execute_shell(char ***to_free, const char *s, char *g_argv0, char **g_argv)
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{
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char param_buf[sizeof("-$%x:%x:%x:%x") + sizeof(unsigned) * 4];
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char *heredoc_argv[4];
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@ -2357,7 +2355,7 @@ static void re_execute_shell(const char *s, char *g_argv0, char **g_argv)
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pp = g_argv;
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while (*pp++)
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cnt++;
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G.argv_from_re_execing = argv = pp = xzalloc(sizeof(argv[0]) * cnt);
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*to_free = argv = pp = xzalloc(sizeof(argv[0]) * cnt);
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*pp++ = (char *) G.argv0_for_re_execing;
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*pp++ = param_buf;
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for (cur = G.top_var; cur; cur = cur->next) {
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@ -2415,16 +2413,6 @@ static void re_execute_shell(const char *s, char *g_argv0, char **g_argv)
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xfunc_error_retval = 127;
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bb_error_msg_and_die("can't re-execute the shell");
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}
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static void clean_up_after_re_execute(void)
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{
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char **pp = G.argv_from_re_execing;
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if (pp) {
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/* Must match re_execute_shell's allocations (if any) */
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free(pp);
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G.argv_from_re_execing = NULL;
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}
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}
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#endif /* !BB_MMU */
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@ -2436,6 +2424,9 @@ static void setup_heredoc(struct redir_struct *redir)
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/* the _body_ of heredoc (misleading field name) */
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const char *heredoc = redir->rd_filename;
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char *expanded;
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#if !BB_MMU
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char **to_free;
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#endif
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expanded = NULL;
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if (!(redir->rd_dup & HEREDOC_QUOTED)) {
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@ -2490,12 +2481,14 @@ static void setup_heredoc(struct redir_struct *redir)
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/* Delegate blocking writes to another process */
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disable_restore_tty_pgrp_on_exit();
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xmove_fd(pair.wr, STDOUT_FILENO);
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re_execute_shell(heredoc, NULL, NULL);
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re_execute_shell(&to_free, heredoc, NULL, NULL);
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#endif
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}
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/* parent */
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enable_restore_tty_pgrp_on_exit();
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clean_up_after_re_execute();
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#if !BB_MMU
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free(to_free);
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#endif
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close(pair.wr);
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free(expanded);
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wait(NULL); /* wait till child has died */
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@ -2742,8 +2735,16 @@ static struct function *new_function(char *name)
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return funcp;
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}
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static void exec_function(const struct function *funcp, char **argv) NORETURN;
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static void exec_function(const struct function *funcp, char **argv)
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#if BB_MMU
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#define exec_function(nommu_save, funcp, argv) \
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exec_function(funcp, argv)
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#endif
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static void exec_function(nommu_save_t *nommu_save,
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const struct function *funcp,
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char **argv) NORETURN;
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static void exec_function(nommu_save_t *nommu_save,
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const struct function *funcp,
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char **argv)
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{
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# if BB_MMU
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int n = 1;
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@ -2758,7 +2759,10 @@ static void exec_function(const struct function *funcp, char **argv)
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fflush(NULL);
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_exit(n);
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# else
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re_execute_shell(funcp->body_as_string, G.global_argv[0], argv + 1);
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re_execute_shell(&nommu_save->argv_from_re_execing,
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funcp->body_as_string,
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G.global_argv[0],
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argv + 1);
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# endif
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}
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@ -2889,7 +2893,7 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save,
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{
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const struct function *funcp = find_function(argv[0]);
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if (funcp) {
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exec_function(funcp, argv);
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exec_function(nommu_save, funcp, argv);
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}
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}
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#endif
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@ -2955,7 +2959,8 @@ static void pseudo_exec(nommu_save_t *nommu_save,
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* since this process is about to exit */
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_exit(rcode);
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#else
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re_execute_shell(command->group_as_string,
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re_execute_shell(&nommu_save->argv_from_re_execing,
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command->group_as_string,
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G.global_argv[0],
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G.global_argv + 1);
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#endif
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@ -3432,6 +3437,7 @@ static int run_pipe(struct pipe *pi)
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nommu_save.new_env = NULL;
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nommu_save.old_env = NULL;
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nommu_save.argv = NULL;
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nommu_save.argv_from_re_execing = NULL;
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#endif
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command = &(pi->cmds[i]);
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if (command->argv) {
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@ -3489,8 +3495,8 @@ static int run_pipe(struct pipe *pi)
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enable_restore_tty_pgrp_on_exit();
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#if !BB_MMU
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/* Clean up after vforked child */
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clean_up_after_re_execute();
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free(nommu_save.argv);
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free(nommu_save.argv_from_re_execing);
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free_strings_and_unsetenv(nommu_save.new_env, 1);
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putenv_all(nommu_save.old_env);
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/* Free the pointers, but the strings themselves
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@ -4657,6 +4663,9 @@ static FILE *generate_stream_from_string(const char *s)
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{
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FILE *pf;
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int pid, channel[2];
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#if !BB_MMU
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char **to_free;
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#endif
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xpipe(channel);
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pid = BB_MMU ? fork() : vfork();
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@ -4688,7 +4697,8 @@ static FILE *generate_stream_from_string(const char *s)
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* huge=`cat BIG` # was blocking here forever
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* echo OK
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*/
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re_execute_shell(s,
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re_execute_shell(&to_free,
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s,
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G.global_argv[0],
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G.global_argv + 1);
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#endif
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@ -4696,7 +4706,9 @@ static FILE *generate_stream_from_string(const char *s)
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/* parent */
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enable_restore_tty_pgrp_on_exit();
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clean_up_after_re_execute();
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#if !BB_MMU
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free(to_free);
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#endif
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close(channel[1]);
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pf = fdopen(channel[0], "r");
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return pf;
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