merge-recursive: Avoid doubly merging rename/add conflict contents

diff --git a/dir.c b/dir.c
index a4bb0a3d071e1435f49b93a0cee0061abe4bc470..133f472a1e73786e781c1021eea17e543858937f 100644 (file)
--- a/dir.c
+++ b/dir.c
@@ -31,22 +31,22 @@ static int common_prefix(const char **pathspec)
        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 = strlen(next);
-               if (len >= prefix && !memcmp(path, next, prefix))
+               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;
-               len = prefix - 1;
-               for (;;) {
-                       if (!len)
-                               return 0;
-                       if (next[--len] != '/')
-                               continue;
-                       if (memcmp(path, next, len+1))
-                               continue;
-                       prefix = len + 1;
-                       break;
-               }
+               if (last_matching_slash < 0)
+                       return 0;
+               prefix = last_matching_slash + 1;
        }
        return prefix;
 }
@@ -453,7 +453,7 @@ static struct dir_entry *dir_add_name(struct dir_struct *dir, const char *pathna
        return dir->entries[dir->nr++] = dir_entry_new(pathname, len);
 }
 
-static struct dir_entry *dir_add_ignored(struct dir_struct *dir, const char *pathname, int len)
+struct dir_entry *dir_add_ignored(struct dir_struct *dir, const char *pathname, int len)
 {
        if (!cache_name_is_other(pathname, len))
                return NULL;
@@ -958,9 +958,14 @@ char *get_relative_cwd(char *buffer, int size, const char *dir)
        }
        if (*dir)
                return NULL;
-       if (*cwd == '/')
+       switch (*cwd) {
+       case '\0':
+               return cwd;
+       case '/':
                return cwd + 1;
-       return cwd;
+       default:
+               return NULL;
+       }
 }
 
 int is_inside_dir(const char *dir)