consolidate pathspec_prefix and common_prefix

The implementation from pathspec_prefix (slightly modified) replaces the
current common_prefix, because it also respects glob characters.

Based on a patch by Clemens Buchacher.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/dir.c b/dir.c
index 08281d2ef74ea7790913e71f08d00299a1825765..7bc75c94486b0419039e54185c29ae2657e26d6b 100644 (file)
--- a/dir.c
+++ b/dir.c
@@ -34,49 +34,43 @@ int fnmatch_icase(const char *pattern, const char *string, int flags)
        return fnmatch(pattern, string, flags | (ignore_case ? FNM_CASEFOLD : 0));
 }
 
-static int common_prefix(const char **pathspec)
+size_t common_prefix_len(const char **pathspec)
 {
-       const char *path, *slash, *next;
-       int prefix;
+       const char *n, *first;
+       size_t max = 0;
 
        if (!pathspec)
-               return 0;
-
-       path = *pathspec;
-       slash = strrchr(path, '/');
-       if (!slash)
-               return 0;
-
-       /*
-        * The first 'prefix' characters of 'path' are common leading
-        * path components among the pathspecs we have seen so far,
-        * including the trailing slash.
-        */
-       prefix = slash - path + 1;
-       while ((next = *++pathspec) != NULL) {
-               int len, last_matching_slash = -1;
-               for (len = 0; len < prefix && next[len] == path[len]; len++)
-                       if (next[len] == '/')
-                               last_matching_slash = len;
-               if (len == prefix)
-                       continue;
-               if (last_matching_slash < 0)
-                       return 0;
-               prefix = last_matching_slash + 1;
+               return max;
+
+       first = *pathspec;
+       while ((n = *pathspec++)) {
+               size_t i, len = 0;
+               for (i = 0; first == n || i < max; i++) {
+                       char c = n[i];
+                       if (!c || c != first[i] || is_glob_special(c))
+                               break;
+                       if (c == '/')
+                               len = i + 1;
+               }
+               if (first == n || len < max) {
+                       max = len;
+                       if (!max)
+                               break;
+               }
        }
-       return prefix;
+       return max;
 }
 
 int fill_directory(struct dir_struct *dir, const char **pathspec)
 {
        const char *path;
-       int len;
+       size_t len;
 
        /*
         * Calculate common prefix for the pathspec, and
         * use that to optimize the directory walk
         */
-       len = common_prefix(pathspec);
+       len = common_prefix_len(pathspec);
        path = "";
 
        if (len)
@@ -84,6 +78,8 @@ int fill_directory(struct dir_struct *dir, const char **pathspec)
 
        /* Read the directory and prune it */
        read_directory(dir, path, len, pathspec);
+       if (*path)
+               free((char *)path);
        return len;
 }
 

diff --git a/dir.h b/dir.h
index 433b5b4cd4c51e9b7557d3056570ed46b7ceba92..467d197984ed0fb960ff4900851680c14cc8f5ea 100644 (file)
--- a/dir.h
+++ b/dir.h
@@ -64,6 +64,7 @@ struct dir_struct {
 #define MATCHED_RECURSIVELY 1
 #define MATCHED_FNMATCH 2
 #define MATCHED_EXACTLY 3
+extern size_t common_prefix_len(const char **pathspec);
 extern int match_pathspec(const char **pathspec, const char *name, int namelen, int prefix, char *seen);
 extern int match_pathspec_depth(const struct pathspec *pathspec,
                                const char *name, int namelen,

diff --git a/setup.c b/setup.c
index f767d8adb110dde7dcafa8cf030ee7a496753800..70b887fe683b4fa72d20066c42a50b7ca34bc458 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -266,34 +266,9 @@ const char **get_pathspec(const char *prefix, const char **pathspec)
 
 char *pathspec_prefix(const char **pathspec)
 {
-       const char **p, *n, *prev;
-       unsigned long max;
+       size_t len = common_prefix_len(pathspec);
 
-       if (!pathspec)
-               return NULL;
-
-       prev = NULL;
-       max = PATH_MAX;
-       for (p = pathspec; (n = *p) != NULL; p++) {
-               int i, len = 0;
-               for (i = 0; i < max; i++) {
-                       char c = n[i];
-                       if (prev && prev[i] != c)
-                               break;
-                       if (!c || c == '*' || c == '?')
-                               break;
-                       if (c == '/')
-                               len = i+1;
-               }
-               prev = n;
-               if (len < max) {
-                       max = len;
-                       if (!max)
-                               break;
-               }
-       }
-
-       return max ? xmemdupz(prev, max) : NULL;
+       return len ? xmemdupz(*pathspec, len) : NULL;
 }
 
 /*