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Date: Tue, 22 Jul 2025 05:25:27 +0200
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To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: cygwin 3.6.4 breaks mbrtowc
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From: Thomas Wolff via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Thomas Wolff <towo AT towo DOT net>
Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>
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mbrtowc is broken in 3.6.4 which breaks non-BMP display in mintty.
Test case below.
Thomas

#include <locale.h>
#include <wchar.h>
#include <stdio.h>

void mb(unsigned char c)
{
   wchar_t wc;
   int ret = mbrtowc(&wc, &c, 1, 0);
   printf("%02X -> %04X : %d\n", c, wc, ret);
}

void main ()
{
   setlocale (LC_CTYPE, "");

   mb(0xF0);
   mb(0x9F);
   mb(0x98);
   mb(0x8E);
}

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