From 5f786c24e4a80d5341f7a7449df5b32ec2dd440a Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Fri, 20 Apr 2007 08:35:45 +0000 Subject: hush: small code shrink; style fixes --- shell/README.job | 1 + shell/hush.c | 108 +++++++++++++++++++++++++++++-------------------------- 2 files changed, 58 insertions(+), 51 deletions(-) (limited to 'shell') diff --git a/shell/README.job b/shell/README.job index 7e262b4..d5ba965 100644 --- a/shell/README.job +++ b/shell/README.job @@ -86,6 +86,7 @@ set fd# 255 foreground process group to first child's one block only CHLD block only CHLD block only CHLD +/* note: because shell is not in foreground now, e.g. Ctrl-C will send INT to children only! */ wait4 for children to die or stop - first child exits wait4 for children to die or stop - second child exits block CHLD TSTP TTIN TTOU diff --git a/shell/hush.c b/shell/hush.c index 56f2728..e2ff012 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -140,19 +140,21 @@ typedef enum { RES_IN = 12, RES_SNTX = 13 } reserved_style; -#define FLAG_END (1<argv[1] == NULL) exit(last_return_code); - exit(atoi(child->argv[1])); + /* mimic bash: exit 123abc == exit 255 + error msg */ + xfunc_error_retval = 255; + /* bash: exit -2 == exit 254, no error msg */ + exit(xatoi(child->argv[1])); } /* built-in 'export VAR=value' handler */ @@ -1217,19 +1224,18 @@ static int checkjobs(struct pipe* fg_pipe) for (pi = job_list; pi; pi = pi->next) { prognum = 0; - while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { + while (prognum < pi->num_progs) { + if (pi->progs[prognum].pid == childpid) + goto found_pi_and_prognum; prognum++; } - if (prognum < pi->num_progs) - break; } - if (pi == NULL) { - debug_printf("checkjobs: pid %d was not in our list!\n", - childpid); - continue; - } + /* Happens when shell is used as init process (init=/bin/sh) */ + debug_printf("checkjobs: pid %d was not in our list!\n", childpid); + continue; + found_pi_and_prognum: if (WIFEXITED(status) || WIFSIGNALED(status)) { /* child exited */ pi->running_progs--; @@ -1539,13 +1545,12 @@ static int run_list_real(struct pipe *pi) pi->progs->argv[0] = save_name; pi->progs->glob_result.gl_pathv[0] = pi->progs->argv[0]; continue; - } else { - /* insert new value from list for variable */ - if (pi->progs->argv[0]) - free(pi->progs->argv[0]); - pi->progs->argv[0] = *list++; - pi->progs->glob_result.gl_pathv[0] = pi->progs->argv[0]; } + /* insert new value from list for variable */ + if (pi->progs->argv[0]) + free(pi->progs->argv[0]); + pi->progs->argv[0] = *list++; + pi->progs->glob_result.gl_pathv[0] = pi->progs->argv[0]; } if (rmode == RES_IN) continue; @@ -1553,7 +1558,7 @@ static int run_list_real(struct pipe *pi) if (!flag_rep) continue; } - if ((rmode == RES_DONE)) { + if (rmode == RES_DONE) { if (flag_rep) { flag_restore = 1; } else { @@ -1590,7 +1595,7 @@ static int run_list_real(struct pipe *pi) } last_return_code = rcode; pi->num_progs = save_num_progs; /* restore number of programs */ - if ( rmode == RES_IF || rmode == RES_ELIF ) + if (rmode == RES_IF || rmode == RES_ELIF) next_if_code = rcode; /* can be overwritten a number of times */ if (rmode == RES_WHILE) flag_rep = !last_return_code; @@ -1663,7 +1668,7 @@ static int free_pipe_list(struct pipe *head, int indent) rcode = free_pipe(pi, indent); final_printf("%s pipe followup code %d\n", indenter(indent), pi->followup); next = pi->next; - pi->next = NULL; + /*pi->next = NULL;*/ free(pi); } return rcode; @@ -1700,7 +1705,8 @@ static int globhack(const char *src, int flags, glob_t *pglob) cnt++; } dest = malloc(cnt); - if (!dest) return GLOB_NOSPACE; + if (!dest) + return GLOB_NOSPACE; if (!(flags & GLOB_APPEND)) { pglob->gl_pathv = NULL; pglob->gl_pathc = 0; @@ -1709,7 +1715,8 @@ static int globhack(const char *src, int flags, glob_t *pglob) } pathc = ++pglob->gl_pathc; pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); - if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; + if (pglob->gl_pathv == NULL) + return GLOB_NOSPACE; pglob->gl_pathv[pathc-1] = dest; pglob->gl_pathv[pathc] = NULL; for (s = src; s && *s; s++, dest++) { @@ -1857,15 +1864,12 @@ static int set_local_var(const char *s, int flg_export) static void unset_local_var(const char *name) { - struct variables *cur; + struct variables *cur, *next; - if (name) { - for (cur = top_vars; cur; cur = cur->next) { - if (strcmp(cur->name, name) == 0) - break; - } - if (cur != 0) { - struct variables *next = top_vars; + if (!name) + return; + for (cur = top_vars; cur; cur = cur->next) { + if (strcmp(cur->name, name) == 0) { if (cur->flg_read_only) { bb_error_msg("%s: readonly variable", name); return; @@ -1874,10 +1878,12 @@ static void unset_local_var(const char *name) unsetenv(cur->name); free((char*)cur->name); free((char*)cur->value); + next = top_vars; while (next->next != cur) next = next->next; next->next = cur->next; free(cur); + return; } } } @@ -1974,9 +1980,9 @@ static void initialize_context(struct p_context *ctx) static int reserved_word(o_string *dest, struct p_context *ctx) { struct reserved_combo { - const char *literal; - int code; - long flag; + char literal[7]; + unsigned char code; + int flag; }; /* Mostly a list of accepted follow-up reserved words. * FLAG_END means we are done with the sequence, and are ready @@ -2223,7 +2229,7 @@ static FILE *generate_stream_from_list(struct pipe *head) } debug_printf("forked child %d\n", pid); close(channel[1]); - pf = fdopen(channel[0],"r"); + pf = fdopen(channel[0], "r"); debug_printf("pipe on FILE *%p\n", pf); return pf; } @@ -2333,7 +2339,7 @@ static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *i } b_addchr(dest, SPECIAL_VAR_SYMBOL); } else if (isdigit(ch)) { - i = ch-'0'; /* XXX is $0 special? */ + i = ch - '0'; /* XXX is $0 special? */ if (i < global_argc) { parse_string(dest, ctx, global_argv[i]); /* recursion */ } @@ -2403,7 +2409,7 @@ static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *i return 0; } -int parse_string(o_string *dest, struct p_context *ctx, const char *src) +static int parse_string(o_string *dest, struct p_context *ctx, const char *src) { struct in_str foo; setup_string_in_str(&foo, src); @@ -2411,7 +2417,7 @@ int parse_string(o_string *dest, struct p_context *ctx, const char *src) } /* return code is 0 for normal exit, 1 for syntax error */ -int parse_stream(o_string *dest, struct p_context *ctx, +static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input, int end_trigger) { int ch, m; @@ -2599,7 +2605,7 @@ static void update_ifs_map(void) /* most recursion does not come through here, the exception is * from builtin_source() */ -int parse_stream_outer(struct in_str *inp, int flag) +static int parse_stream_outer(struct in_str *inp, int flag) { struct p_context ctx; o_string temp = NULL_O_STRING; @@ -2736,8 +2742,8 @@ int hush_main(int argc, char **argv) while ((opt = getopt(argc, argv, "c:xif")) > 0) { switch (opt) { case 'c': - global_argv = argv+optind; - global_argc = argc-optind; + global_argv = argv + optind; + global_argc = argc - optind; opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON); goto final_return; case 'i': -- cgit v1.1