log: drop unused "len" from show_tagger()

peff · gitster · commit af117077d38a · 2019-03-20T18:34:09.000+09:00
We pass the length of the found "tagger" line to show_tagger(), but it
does not use it; instead, it passes the string to pp_user_info(), which
reads until newline or NUL. This is OK for our purposes because we
always read the object contents into a buffer with an extra NUL (and
indeed, our sole caller already relies on this by using starts_with).

Let's drop the ignored parameter. And while we're touching the caller,
let's use skip_prefix() to avoid a magic number.

Signed-off-by: Jeff King &lt;peff@peff.net&gt;
Signed-off-by: Junio C Hamano &lt;gitster@pobox.com&gt;
diff --git a/builtin/log.c b/builtin/log.c
@@ -490,7 +490,7 @@ int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 	return cmd_log_walk(&rev);
 }
 
-static void show_tagger(char *buf, int len, struct rev_info *rev)
+static void show_tagger(const char *buf, struct rev_info *rev)
 {
 	struct strbuf out = STRBUF_INIT;
 	struct pretty_print_context pp = {0};
@@ -546,11 +546,11 @@ static int show_tag_object(const struct object_id *oid, struct rev_info *rev)
 	assert(type == OBJ_TAG);
 	while (offset < size && buf[offset] != '\n') {
 		int new_offset = offset + 1;
+		const char *ident;
 		while (new_offset < size && buf[new_offset++] != '\n')
 			; /* do nothing */
-		if (starts_with(buf + offset, "tagger "))
-			show_tagger(buf + offset + 7,
-				    new_offset - offset - 7, rev);
+		if (skip_prefix(buf + offset, "tagger ", &ident))
+			show_tagger(ident, rev);
 		offset = new_offset;
 	}
 
