rename/copy score parsing updates.

Better variant, which handles stuff like "4.5%" and rejects
"192.168.0.1".  Additionally, make sure numbers are unsigned (I'm making
them unsigned long just for the hell of it), to make sure that
artificial wraparound scenarios don't cause harm.

	-hpa

[jc: with this, -M100 changes its meaning back to 10%.  People
wanting to say "pure renames only" should now say -M100% or
-M1.0; sounds a bit like an earthquake, but arguably things are
more consistent this way ;-)]

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

diff --git a/diff.c b/diff.c
index 0f839c11b7efef344d8f695842ce48120c565a68..ffe8a5523406badc415b11f468a2aafb7c9611a9 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -838,29 +838,38 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 
 static int parse_num(const char **cp_p)
 {
-       int num, scale, ch, cnt;
+       unsigned long num, scale;
+       int ch, dot;
        const char *cp = *cp_p;
 
-       cnt = num = 0;
+       num = 0;
        scale = 1;
-       while ('0' <= (ch = *cp) && ch <= '9') {
-               if (cnt++ < 5) {
-                       /* We simply ignore more than 5 digits precision. */
-                       scale *= 10;
-                       num = num * 10 + ch - '0';
+       dot = 0;
+       for(;;) {
+               ch = *cp;
+               if ( !dot && ch == '.' ) {
+                       scale = 1;
+                       dot = 1;
+               } else if ( ch == '%' ) {
+                       scale = dot ? scale*100 : 100;
+                       cp++;   /* % is always at the end */
+                       break;
+               } else if ( ch >= '0' && ch <= '9' ) {
+                       if ( scale < 100000 ) {
+                               scale *= 10;
+                               num = (num*10) + (ch-'0');
+                       }
+               } else {
+                       break;
                }
                cp++;
        }
        *cp_p = cp;
 
-       /* special case: -M100 would mean 1.0 not 0.1 */
-       if (num == 100 && scale == 1000)
-               return MAX_SCORE;
-
        /* user says num divided by scale and we say internally that
         * is MAX_SCORE * num / scale.
         */
-       return (MAX_SCORE * num / scale);
+       return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
 }
 
 int diff_scoreopt_parse(const char *opt)