[1765] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
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| 6 | *
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[2725] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[1765] | 8 | */
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| 9 |
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| 10 | #include "libbb.h"
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| 11 |
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| 12 | /* check if path points to an executable file;
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| 13 | * return 1 if found;
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| 14 | * return 0 otherwise;
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| 15 | */
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[2725] | 16 | int FAST_FUNC execable_file(const char *name)
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[1765] | 17 | {
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| 18 | struct stat s;
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| 19 | return (!access(name, X_OK) && !stat(name, &s) && S_ISREG(s.st_mode));
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| 20 | }
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| 21 |
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[2725] | 22 | /* search (*PATHp) for an executable file;
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[1765] | 23 | * return allocated string containing full path if found;
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[2725] | 24 | * PATHp points to the component after the one where it was found
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| 25 | * (or NULL),
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| 26 | * you may call find_execable again with this PATHp to continue
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| 27 | * (if it's not NULL).
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| 28 | * return NULL otherwise; (PATHp is undefined)
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| 29 | * in all cases (*PATHp) contents will be trashed (s/:/NUL/).
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[1765] | 30 | */
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[2725] | 31 | char* FAST_FUNC find_execable(const char *filename, char **PATHp)
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[1765] | 32 | {
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[2725] | 33 | char *p, *n;
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[1765] | 34 |
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[2725] | 35 | p = *PATHp;
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[1765] | 36 | while (p) {
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| 37 | n = strchr(p, ':');
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| 38 | if (n)
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| 39 | *n++ = '\0';
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| 40 | if (*p != '\0') { /* it's not a PATH="foo::bar" situation */
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| 41 | p = concat_path_file(p, filename);
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| 42 | if (execable_file(p)) {
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[2725] | 43 | *PATHp = n;
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[1765] | 44 | return p;
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| 45 | }
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| 46 | free(p);
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| 47 | }
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| 48 | p = n;
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[2725] | 49 | } /* on loop exit p == NULL */
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| 50 | return p;
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[1765] | 51 | }
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| 52 |
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| 53 | /* search $PATH for an executable file;
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| 54 | * return 1 if found;
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| 55 | * return 0 otherwise;
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| 56 | */
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[2725] | 57 | int FAST_FUNC exists_execable(const char *filename)
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[1765] | 58 | {
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[2725] | 59 | char *path = xstrdup(getenv("PATH"));
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| 60 | char *tmp = path;
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| 61 | char *ret = find_execable(filename, &tmp);
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| 62 | free(path);
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[1765] | 63 | if (ret) {
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| 64 | free(ret);
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| 65 | return 1;
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| 66 | }
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| 67 | return 0;
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| 68 | }
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| 69 |
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| 70 | #if ENABLE_FEATURE_PREFER_APPLETS
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[3232] | 71 | /* just like the real execvp, but try to launch an applet named 'file' first */
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| 72 | int FAST_FUNC BB_EXECVP(const char *file, char *const argv[])
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[1765] | 73 | {
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[3232] | 74 | if (find_applet_by_name(file) >= 0)
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| 75 | execvp(bb_busybox_exec_path, argv);
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| 76 | return execvp(file, argv);
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[1765] | 77 | }
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| 78 | #endif
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[2725] | 79 |
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| 80 | int FAST_FUNC BB_EXECVP_or_die(char **argv)
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| 81 | {
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| 82 | BB_EXECVP(argv[0], argv);
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| 83 | /* SUSv3-mandated exit codes */
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| 84 | xfunc_error_retval = (errno == ENOENT) ? 127 : 126;
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| 85 | bb_perror_msg_and_die("can't execute '%s'", argv[0]);
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| 86 | }
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