/* vi: set sw=4 ts=4: */ /* * Utility routines. * * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu> * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ #include "libbb.h" /* check if path points to an executable file; * return 1 if found; * return 0 otherwise; */ int FAST_FUNC execable_file(const char *name) { struct stat s; return (!access(name, X_OK) && !stat(name, &s) && S_ISREG(s.st_mode)); } /* search (*PATHp) for an executable file; * return allocated string containing full path if found; * PATHp points to the component after the one where it was found * (or NULL), * you may call find_execable again with this PATHp to continue * (if it's not NULL). * return NULL otherwise; (PATHp is undefined) * in all cases (*PATHp) contents will be trashed (s/:/NUL/). */ char* FAST_FUNC find_execable(const char *filename, char **PATHp) { char *p, *n; p = *PATHp; while (p) { n = strchr(p, ':'); if (n) *n++ = '\0'; if (*p != '\0') { /* it's not a PATH="foo::bar" situation */ p = concat_path_file(p, filename); if (execable_file(p)) { *PATHp = n; return p; } free(p); } p = n; } /* on loop exit p == NULL */ return p; } /* search $PATH for an executable file; * return 1 if found; * return 0 otherwise; */ int FAST_FUNC exists_execable(const char *filename) { char *path = xstrdup(getenv("PATH")); char *tmp = path; char *ret = find_execable(filename, &tmp); free(path); if (ret) { free(ret); return 1; } return 0; } #if ENABLE_FEATURE_PREFER_APPLETS /* just like the real execvp, but try to launch an applet named 'file' first */ int FAST_FUNC BB_EXECVP(const char *file, char *const argv[]) { if (find_applet_by_name(file) >= 0) execvp(bb_busybox_exec_path, argv); return execvp(file, argv); } #endif int FAST_FUNC BB_EXECVP_or_die(char **argv) { BB_EXECVP(argv[0], argv); /* SUSv3-mandated exit codes */ xfunc_error_retval = (errno == ENOENT) ? 127 : 126; bb_perror_msg_and_die("can't execute '%s'", argv[0]); }