From 95e40115a2cedbd1a0bd29fb58e4a66e5ab01ea1 Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicholas.marriott@gmail.com>
Date: Sat, 4 Apr 2026 12:11:25 +0100
Subject: [PATCH] Don't just resize buffer once, repeat until it is big enough.
 Also use reallocarray. Reported by tuannguyenduc228 at gmail dot com.

---
 image-sixel.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/image-sixel.c b/image-sixel.c
index f6eaade3..c37e2cce 100644
--- a/image-sixel.c
+++ b/image-sixel.c
@@ -487,9 +487,9 @@ static void
 sixel_print_add(char **buf, size_t *len, size_t *used, const char *s,
     size_t slen)
 {
-	if (*used + slen >= *len + 1) {
+	while (*used + slen >= *len + 1) {
+		*buf = xreallocarray(*buf, 2, *len);
 		(*len) *= 2;
-		*buf = xrealloc(*buf, *len);
 	}
 	memcpy(*buf + *used, s, slen);
 	(*used) += slen;