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-rw-r--r--debianutils/which.c69
1 files changed, 23 insertions, 46 deletions
diff --git a/debianutils/which.c b/debianutils/which.c
index db28f78..583d946 100644
--- a/debianutils/which.c
+++ b/debianutils/which.c
@@ -26,43 +26,20 @@ int which_main(int argc, char **argv)
{
int status;
size_t i, count;
- char *path_list;
+ char *path_list, *p;
- if (argc <= 1 || **(argv + 1) == '-') {
+ if (argc <= 1 || argv[1][0] == '-') {
bb_show_usage();
}
argc--;
path_list = getenv("PATH");
if (path_list != NULL) {
- size_t path_len = strlen(path_list);
- char *new_list = NULL;
count = 1;
-
- for (i = 0; i <= path_len; i++) {
- char *this_i = &path_list[i];
- if (*this_i == ':') {
- /* ^::[^:] == \.: */
- if (!i && (*(this_i + 1) == ':')) {
- *this_i = '.';
- continue;
- }
- *this_i = 0;
- count++;
- /* ^:[^:] == \.0 and [^:]::[^:] == 0\.0 and [^:]:$ == 0\.0 */
- if (!i || (*(this_i + 1) == ':') || (i == path_len-1)) {
- new_list = xrealloc(new_list, path_len += 1);
- if (i) {
- memmove(&new_list[i+2], &path_list[i+1], path_len-i);
- new_list[i+1] = '.';
- memmove(new_list, path_list, i);
- } else {
- memmove(&new_list[i+1], &path_list[i], path_len-i);
- new_list[i] = '.';
- }
- path_list = new_list;
- }
- }
+ p = path_list;
+ while ((p = strchr(p, ':')) != NULL) {
+ *p++ = 0;
+ count++;
}
} else {
path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
@@ -73,34 +50,34 @@ int which_main(int argc, char **argv)
while (argc-- > 0) {
struct stat stat_b;
char *buf;
- char *path_n;
- int found = 0;
argv++;
- path_n = path_list;
- buf = *argv;
+ buf = argv[0];
- /* if filename is either absolute or contains slashes,
+ /* If filename is either absolute or contains slashes,
* stat it */
- if (strchr(buf, '/') != NULL && is_executable_file(buf, &stat_b)) {
- found++;
+ if (strchr(buf, '/')) {
+ if (is_executable_file(buf, &stat_b)) {
+ puts(buf);
+ goto next;
+ }
} else {
- /* Couldn't access file and file doesn't contain slashes */
+ /* File doesn't contain slashes */
+ p = path_list;
for (i = 0; i < count; i++) {
- buf = concat_path_file(path_n, *argv);
+ /* Empty component in PATH is treated as . */
+ buf = concat_path_file(p[0] ? p : ".", argv[0]);
if (is_executable_file(buf, &stat_b)) {
- found++;
- break;
+ puts(buf);
+ free(buf);
+ goto next;
}
free(buf);
- path_n += (strlen(path_n) + 1);
+ p += strlen(p) + 1;
}
}
- if (found) {
- puts(buf);
- } else {
- status = EXIT_FAILURE;
- }
+ status = EXIT_FAILURE;
+ next: /* nothing */;
}
bb_fflush_stdout_and_exit(status);
}