*
* Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
* return 1 if found;
* return 0 otherwise;
*/
-int execable_file(const char *name)
+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 $PATH for an executable file;
+/* search (*PATHp) for an executable file;
* return allocated string containing full path if found;
- * return NULL otherwise;
+ * 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 *find_execable(const char *filename)
+char* FAST_FUNC find_execable(const char *filename, char **PATHp)
{
- char *path, *p, *n;
+ char *p, *n;
- p = path = xstrdup(getenv("PATH"));
+ p = *PATHp;
while (p) {
n = strchr(p, ':');
if (n)
if (*p != '\0') { /* it's not a PATH="foo::bar" situation */
p = concat_path_file(p, filename);
if (execable_file(p)) {
- free(path);
+ *PATHp = n;
return p;
}
free(p);
}
p = n;
- }
- free(path);
- return NULL;
+ } /* on loop exit p == NULL */
+ return p;
}
/* search $PATH for an executable file;
* return 1 if found;
* return 0 otherwise;
*/
-int exists_execable(const char *filename)
+int FAST_FUNC exists_execable(const char *filename)
{
- char *ret = find_execable(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]);
+}