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-rw-r--r--libbb/execable.c27
1 files changed, 17 insertions, 10 deletions
diff --git a/libbb/execable.c b/libbb/execable.c
index 2649a6c..5c2b450 100644
--- a/libbb/execable.c
+++ b/libbb/execable.c
@@ -19,15 +19,20 @@ int execable_file(const char *name)
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 *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)
@@ -35,15 +40,14 @@ char *find_execable(const char *filename)
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;
@@ -52,7 +56,10 @@ char *find_execable(const char *filename)
*/
int 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;