From 3a1344bc67ca006c102c4ca891aba9b5100e3e30 Mon Sep 17 00:00:00 2001
From: sezero <sezero@users.sourceforge.net>
Date: Sun, 11 Nov 2018 00:51:10 +0300
Subject: info.c (tagcompare): use a locale-insensitive toupper()

see: https://gitlab.xiph.org/xiph/vorbis/issues/2079
---
 lib/info.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/info.c b/lib/info.c
index 23efa25c..4a5e2b30 100644
--- a/lib/info.c
+++ b/lib/info.c
@@ -19,7 +19,6 @@
 
 #include <stdlib.h>
 #include <string.h>
-#include <ctype.h>
 #include <ogg/ogg.h>
 #include "vorbis/codec.h"
 #include "codec_internal.h"
@@ -47,6 +46,10 @@ static void _v_readstring(oggpack_buffer *o,char *buf,int bytes){
   }
 }
 
+static int _v_toupper(int c) {
+  return (c >= 'a' && c <= 'z') ? (c & ~('a' - 'A')) : c;
+}
+
 void vorbis_comment_init(vorbis_comment *vc){
   memset(vc,0,sizeof(*vc));
 }
@@ -78,7 +81,7 @@ void vorbis_comment_add_tag(vorbis_comment *vc, const char *tag, const char *con
 static int tagcompare(const char *s1, const char *s2, int n){
   int c=0;
   while(c < n){
-    if(toupper(s1[c]) != toupper(s2[c]))
+    if(_v_toupper(s1[c]) != _v_toupper(s2[c]))
       return !0;
     c++;
   }
-- 
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