grep: micro-optimize hit collection for AND nodes

[git.git] / path.c

diff --git a/path.c b/path.c
index 6b7be5b869fde16ea4f7cadf8277f704c9469f4c..e332b504a6b8c6b229da2526c4f810b8d0fb9889 100644 (file)
--- a/path.c
+++ b/path.c
@@ -363,58 +363,19 @@ const char *make_relative_path(const char *abs, const char *base)
 }
 
 /*
- * path = absolute path
- * buf = buffer of at least max(2, strlen(path)+1) bytes
- * It is okay if buf == path, but they should not overlap otherwise.
+ * It is okay if dst == src, but they should not overlap otherwise.
  *
- * Performs the following normalizations on path, storing the result in buf:
- * - Removes trailing slashes.
- * - Removes empty components.
+ * Performs the following normalizations on src, storing the result in dst:
+ * - Ensures that components are separated by '/' (Windows only)
+ * - Squashes sequences of '/'.
  * - Removes "." components.
  * - Removes ".." components, and the components the precede them.
- * "" and paths that contain only slashes are normalized to "/".
- * Returns the length of the output.
+ * Returns failure (non-zero) if a ".." component appears as first path
+ * component anytime during the normalization. Otherwise, returns success (0).
  *
  * Note that this function is purely textual.  It does not follow symlinks,
  * verify the existence of the path, or make any system calls.
  */
-int normalize_absolute_path(char *buf, const char *path)
-{
-       const char *comp_start = path, *comp_end = path;
-       char *dst = buf;
-       int comp_len;
-       assert(buf);
-       assert(path);
-
-       while (*comp_start) {
-               assert(*comp_start == '/');
-               while (*++comp_end && *comp_end != '/')
-                       ; /* nothing */
-               comp_len = comp_end - comp_start;
-
-               if (!strncmp("/",  comp_start, comp_len) ||
-                   !strncmp("/.", comp_start, comp_len))
-                       goto next;
-
-               if (!strncmp("/..", comp_start, comp_len)) {
-                       while (dst > buf && *--dst != '/')
-                               ; /* nothing */
-                       goto next;
-               }
-
-               memmove(dst, comp_start, comp_len);
-               dst += comp_len;
-       next:
-               comp_start = comp_end;
-       }
-
-       if (dst == buf)
-               *dst++ = '/';
-
-       *dst = '\0';
-       return dst - buf;
-}
-
 int normalize_path_copy(char *dst, const char *src)
 {
        char *dst0;
@@ -538,3 +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));
+}