diffstat rename squashing fix.

When renaming leading/a/filename to leading/b/filename (and
"filename" is sufficiently long), we tried to squash the rename
to "leading/{a => b}/filename".  However, when "/a" or "/b" part
is empty, we underflowed and tried to print a substring of
length -1.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/diff.c b/diff.c
index 7a7b839..5285c03 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -232,11 +232,16 @@ static char *pprint_rename(const char *a, const char *b)
         * name-a => name-b
         */
        if (pfx_length + sfx_length) {
+               int a_midlen = len_a - pfx_length - sfx_length;
+               int b_midlen = len_b - pfx_length - sfx_length;
+               if (a_midlen < 0) a_midlen = 0;
+               if (b_midlen < 0) b_midlen = 0;
+
                name = xmalloc(len_a + len_b - pfx_length - sfx_length + 7);
                sprintf(name, "%.*s{%.*s => %.*s}%s",
                        pfx_length, a,
-                       len_a - pfx_length - sfx_length, a + pfx_length,
-                       len_b - pfx_length - sfx_length, b + pfx_length,
+                       a_midlen, a + pfx_length,
+                       b_midlen, b + pfx_length,
                        a + len_a - sfx_length);
        }
        else {