diff options
Diffstat (limited to 'libbb/execable.c')
| -rw-r--r-- | libbb/execable.c | 27 |
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; |