Denis Vlasenko | 5cb4648 | 2006-10-12 06:12:11 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Utility routines. |
| 4 | * |
| 5 | * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu> |
| 6 | * |
| 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| 8 | */ |
| 9 | |
| 10 | #include "libbb.h" |
| 11 | |
| 12 | /* check if path points to an executable file; |
| 13 | * return 1 if found; |
| 14 | * return 0 otherwise; |
| 15 | */ |
| 16 | int execable_file(const char *name) |
| 17 | { |
| 18 | struct stat s; |
| 19 | return (!access(name, X_OK) && !stat(name, &s) && S_ISREG(s.st_mode)); |
| 20 | } |
| 21 | |
| 22 | /* search $PATH for an executable file; |
| 23 | * return allocated string containing full path if found; |
| 24 | * return NULL otherwise; |
| 25 | */ |
| 26 | char *find_execable(const char *filename) |
| 27 | { |
| 28 | char *path, *p, *n; |
| 29 | |
Denis Vlasenko | 12f5676 | 2006-10-12 06:15:13 +0000 | [diff] [blame] | 30 | p = path = xstrdup(getenv("PATH")); |
Denis Vlasenko | 5cb4648 | 2006-10-12 06:12:11 +0000 | [diff] [blame] | 31 | while (p) { |
| 32 | n = strchr(p, ':'); |
| 33 | if (n) |
| 34 | *n++ = '\0'; |
| 35 | if (*p != '\0') { /* it's not a PATH="foo::bar" situation */ |
| 36 | p = concat_path_file(p, filename); |
| 37 | if (execable_file(p)) { |
| 38 | free(path); |
| 39 | return p; |
| 40 | } |
| 41 | free(p); |
| 42 | } |
| 43 | p = n; |
| 44 | } |
| 45 | free(path); |
| 46 | return NULL; |
| 47 | } |
| 48 | |
| 49 | /* search $PATH for an executable file; |
| 50 | * return 1 if found; |
| 51 | * return 0 otherwise; |
| 52 | */ |
| 53 | int exists_execable(const char *filename) |
| 54 | { |
| 55 | char *ret = find_execable(filename); |
| 56 | if (ret) { |
| 57 | free(ret); |
| 58 | return 1; |
| 59 | } |
| 60 | return 0; |
| 61 | } |
Denis Vlasenko | 1d76f43 | 2007-02-06 01:20:12 +0000 | [diff] [blame^] | 62 | |
| 63 | #ifdef ENABLE_FEATURE_EXEC_PREFER_APPLETS |
| 64 | /* just like the real execvp, but try to launch an applet named 'file' first |
| 65 | */ |
| 66 | int bb_execvp(const char *file, char *const argv[]) |
| 67 | { |
| 68 | return execvp(find_applet_by_name(file) ? CONFIG_BUSYBOX_EXEC_PATH : file, |
| 69 | argv); |
| 70 | } |
| 71 | #endif |