return path_make_absolute(p, cwd);
}
+int path_make_relative(const char *from_dir, const char *to_path, char **_r) {
+ char *r, *p;
+ unsigned n_parents;
+ size_t to_path_len;
+
+ assert(from_dir);
+ assert(to_path);
+ assert(_r);
+
+ /* Strips the common part, and adds ".." elements as necessary. */
+
+ if (!path_is_absolute(from_dir))
+ return -EINVAL;
+
+ if (!path_is_absolute(to_path))
+ return -EINVAL;
+
+ /* Skip the common part. */
+ for (;;) {
+ size_t a;
+ size_t b;
+
+ from_dir += strspn(from_dir, "/");
+ to_path += strspn(to_path, "/");
+
+ if (!*from_dir) {
+ if (!*to_path)
+ /* from_dir equals to_path. */
+ r = strdup(".");
+ else
+ /* from_dir is a parent directory of to_path. */
+ r = strdup(to_path);
+
+ if (!r)
+ return -ENOMEM;
+
+ *_r = r;
+ return 0;
+ }
+
+ if (!*to_path)
+ break;
+
+ a = strcspn(from_dir, "/");
+ b = strcspn(to_path, "/");
+
+ if (a != b)
+ break;
+
+ if (memcmp(from_dir, to_path, a) != 0)
+ break;
+
+ from_dir += a;
+ to_path += b;
+ }
+
+ /* If we're here, then "from_dir" has one or more elements that need to
+ * be replaced with "..". */
+
+ /* Count the number of necessary ".." elements. */
+ for (n_parents = 0;;) {
+ from_dir += strspn(from_dir, "/");
+
+ if (!*from_dir)
+ break;
+
+ from_dir += strcspn(from_dir, "/");
+ n_parents++;
+ }
+
+ to_path_len = strlen(to_path);
+
+ r = malloc(n_parents * 3 + to_path_len);
+ if (!r)
+ return -ENOMEM;
+
+ for (p = r; n_parents > 0; n_parents--, p += 3)
+ memcpy(p, "../", 3);
+
+ if (to_path_len > 0)
+ memcpy(p, to_path, to_path_len);
+ else
+ /* "to_path" is a parent directory of "from_dir". Let's remove
+ * the redundant slash from the end of the result. */
+ *(p - 1) = 0;
+
+ *_r = r;
+ return 0;
+}
+
char **path_strv_make_absolute_cwd(char **l) {
char **s;
STRV_FOREACH(s, l) {
char *t, *u;
+ _cleanup_free_ char *orig = NULL;
- if (!path_is_absolute(*s))
+ if (!path_is_absolute(*s)) {
+ free(*s);
continue;
+ }
if (prefix) {
- t = strappend(prefix, *s);
- free(*s);
- *s = NULL;
-
+ orig = *s;
+ t = strappend(prefix, orig);
if (!t) {
enomem = true;
continue;
}
- } else {
+ } else
t = *s;
- *s = NULL;
- }
errno = 0;
u = canonicalize_file_name(t);
if (!u) {
- if (errno == ENOENT)
- u = t;
- else {
+ if (errno == ENOENT) {
+ if (prefix) {
+ u = orig;
+ orig = NULL;
+ free(t);
+ } else
+ u = t;
+ } else {
free(t);
if (errno == ENOMEM || errno == 0)
enomem = true;
continue;
}
+ } else if (prefix) {
+ char *x;
+
+ free(t);
+ x = path_startswith(u, prefix);
+ if (x) {
+ /* restore the slash if it was lost */
+ if (!startswith(x, "/"))
+ *(--x) = '/';
+
+ t = strdup(x);
+ free(u);
+ if (!t) {
+ enomem = true;
+ continue;
+ }
+ u = t;
+ } else {
+ /* canonicalized path goes outside of
+ * prefix, keep the original path instead */
+ u = orig;
+ orig = NULL;
+ }
} else
free(t);