From 686d54baf1df6e0775898f484d1670742898b3b2 Mon Sep 17 00:00:00 2001
From: z2_ <88509734+z2-2z@users.noreply.github.com>
Date: Wed, 17 Jul 2024 23:48:33 +0200
Subject: [PATCH] idn: tweak buffer use when converting with macidn

Closes #14215
---
 lib/idn.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/idn.c b/lib/idn.c
index 8d6bfe7ce6..3d7c1d820c 100644
--- a/lib/idn.c
+++ b/lib/idn.c
@@ -66,7 +66,7 @@ static CURLcode mac_idn_to_ascii(const char *in, char **out)
     UIDNAInfo info = UIDNA_INFO_INITIALIZER;
     char buffer[256] = {0};
     (void)uidna_nameToASCII_UTF8(idna, in, -1, buffer,
-      sizeof(buffer), &info, &err);
+                                 sizeof(buffer) - 1, &info, &err);
     uidna_close(idna);
     if(U_FAILURE(err)) {
       return CURLE_URL_MALFORMAT;
@@ -93,7 +93,7 @@ static CURLcode mac_ascii_to_idn(const char *in, char **out)
     UIDNAInfo info = UIDNA_INFO_INITIALIZER;
     char buffer[256] = {0};
     (void)uidna_nameToUnicodeUTF8(idna, in, -1, buffer,
-      sizeof(buffer), &info, &err);
+                                  sizeof(buffer) - 1, &info, &err);
     uidna_close(idna);
     if(U_FAILURE(err)) {
       return CURLE_URL_MALFORMAT;
-- 
2.47.3