builtin/apply: tighten (dis)similarity index parsing

This was prompted by an incorrect warning issued by clang [1], and a
suggestion by Linus to restrict the range to check for values greater
than INT_MAX since these will give bogus output after casting to int.

In fact the (dis)similarity index is a percentage, so reject values
greater than 100.

[1] http://article.gmane.org/gmane.comp.version-control.git/213857

Signed-off-by: John Keeping <john@keeping.me.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/apply.c b/builtin/apply.c
index ca8695a..fd2b40e 100644 (file)
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -1041,15 +1041,17 @@ static int gitdiff_renamedst(const char *line, struct patch *patch)
 
 static int gitdiff_similarity(const char *line, struct patch *patch)
 {
-       if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
-               patch->score = 0;
+       unsigned long val = strtoul(line, NULL, 10);
+       if (val <= 100)
+               patch->score = val;
        return 0;
 }
 
 static int gitdiff_dissimilarity(const char *line, struct patch *patch)
 {
-       if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
-               patch->score = 0;
+       unsigned long val = strtoul(line, NULL, 10);
+       if (val <= 100)
+               patch->score = val;
        return 0;
 }