Implement a simple delta_base cache

diff --git a/diff-lib.c b/diff-lib.c
index 470ad656a8766ff866e76bfde0ea4535743e0d5b..6abb981534bf032d50e28eb3a14033c1b6546762 100644 (file)
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -30,28 +30,28 @@ static int read_directory(const char *path, struct path_list *list)
        return 0;
 }
 
+static int get_mode(const char *path, int *mode)
+{
+       struct stat st;
+
+       if (!path || !strcmp(path, "/dev/null"))
+               *mode = 0;
+       else if (!strcmp(path, "-"))
+               *mode = ntohl(create_ce_mode(0666));
+       else if (stat(path, &st))
+               return error("Could not access '%s'", path);
+       else
+               *mode = st.st_mode;
+       return 0;
+}
+
 static int queue_diff(struct diff_options *o,
                const char *name1, const char *name2)
 {
-       struct stat st;
        int mode1 = 0, mode2 = 0;
 
-       if (name1) {
-               if (!strcmp(name1, "-"))
-                       mode1 = ntohl(create_ce_mode(0666));
-               else if (stat(name1, &st))
-                       return error("Could not access '%s'", name1);
-               else
-                       mode1 = st.st_mode;
-       }
-       if (name2) {
-               if (!strcmp(name2, "-"))
-                       mode2 = ntohl(create_ce_mode(0666));
-               else if (stat(name2, &st))
-                       return error("Could not access '%s'", name2);
-               else
-                       mode2 = st.st_mode;
-       }
+       if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
+               return -1;
 
        if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
                return error("file/directory conflict: %s, %s", name1, name2);
@@ -424,6 +424,9 @@ int run_diff_files(struct rev_info *revs, int silent_on_removed)
                    S_ISREG(newmode) && S_ISREG(oldmode) &&
                    ((newmode ^ oldmode) == 0111))
                        newmode = oldmode;
+               else if (!has_symlinks &&
+                   S_ISREG(newmode) && S_ISLNK(oldmode))
+                       newmode = oldmode;
                diff_change(&revs->diffopt, oldmode, newmode,
                            ce->sha1, (changed ? null_sha1 : ce->sha1),
                            ce->name, NULL);