[PATCH] diff: parse ws-error-highlight option more strictly

["René Scharfe" <l.s.r@web.de>]

Check if a matched token is followed by a delimiter before advancing the
pointer arg.  This avoids accepting composite words like "allnew" or
"defaultcontext".

Signed-off-by: Rene Scharfe <l.s.r@web.de>
---
 diff.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/diff.c b/diff.c
index 87b16d5..0f17ec5 100644
--- a/diff.c
+++ b/diff.c
@@ -3653,7 +3653,12 @@ static void enable_patch_output(int *fmt) {
 
 static int parse_one_token(const char **arg, const char *token)
 {
-	return skip_prefix(*arg, token, arg) && (!**arg || **arg == ',');
+	const char *rest;
+	if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
+		*arg = rest;
+		return 1;
+	}
+	return 0;
 }
 
 static int parse_ws_error_highlight(struct diff_options *opt, const char *arg)
-- 
2.4.4