format_sanitized_subject: Don't trim past initial length of strbuf

diff --git a/path.c b/path.c
index dd22370e8e5cb932f9c8ce8756c154073771b35b..e332b504a6b8c6b229da2526c4f810b8d0fb9889 100644 (file)
--- a/path.c
+++ b/path.c
@@ -154,7 +154,7 @@ int validate_headref(const char *path)
        /* Make sure it is a "refs/.." symlink */
        if (S_ISLNK(st.st_mode)) {
                len = readlink(path, buffer, sizeof(buffer)-1);
-               if (len >= 11 && !memcmp("refs/heads/", buffer, 11))
+               if (len >= 5 && !memcmp("refs/", buffer, 5))
                        return 0;
                return -1;
        }
@@ -178,7 +178,7 @@ int validate_headref(const char *path)
                len -= 4;
                while (len && isspace(*buf))
                        buf++, len--;
-               if (len >= 11 && !memcmp("refs/heads/", buf, 11))
+               if (len >= 5 && !memcmp("refs/", buf, 5))
                        return 0;
        }
 
@@ -499,3 +499,39 @@ int longest_ancestor_length(const char *path, const char *prefix_list)
 
        return max_len;
 }
+
+/* strip arbitrary amount of directory separators at end of path */
+static inline int chomp_trailing_dir_sep(const char *path, int len)
+{
+       while (len && is_dir_sep(path[len - 1]))
+               len--;
+       return len;
+}
+
+/*
+ * If path ends with suffix (complete path components), returns the
+ * part before suffix (sans trailing directory separators).
+ * Otherwise returns NULL.
+ */
+char *strip_path_suffix(const char *path, const char *suffix)
+{
+       int path_len = strlen(path), suffix_len = strlen(suffix);
+
+       while (suffix_len) {
+               if (!path_len)
+                       return NULL;
+
+               if (is_dir_sep(path[path_len - 1])) {
+                       if (!is_dir_sep(suffix[suffix_len - 1]))
+                               return NULL;
+                       path_len = chomp_trailing_dir_sep(path, path_len);
+                       suffix_len = chomp_trailing_dir_sep(suffix, suffix_len);
+               }
+               else if (path[--path_len] != suffix[--suffix_len])
+                       return NULL;
+       }
+
+       if (path_len && !is_dir_sep(path[path_len - 1]))
+               return NULL;
+       return xstrndup(path, chomp_trailing_dir_sep(path, path_len));
+}