Date: Sun, 15 Jul 2007 08:00:15 GMT From: Christoph Mallon <christoph.mallon@gmx.de> To: freebsd-standards@FreeBSD.org Subject: Re: kern/114578: [libc] wide character printing using swprintf(dst, n, "%ls", txt) fails depending on LC_CTYPE Message-ID: <200707150800.l6F80FWt026610@freefall.freebsd.org>
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The following reply was made to PR kern/114578; it has been noted by GNATS.
From: Christoph Mallon <christoph.mallon@gmx.de>
To: bug-followup@FreeBSD.org
Cc:
Subject: Re: kern/114578: [libc] wide character printing using swprintf(dst,
n, "%ls", txt) fails depending on LC_CTYPE
Date: Sun, 15 Jul 2007 09:58:18 +0200
Here is a simplified example:
#include <locale.h>
#include <stdio.h>
#include <wchar.h>
static const wchar_t txt[] = { 0x41C, 0x43D, 0x440, 0 }; // "Mir" in
cyrillic
int main(void)
{
wchar_t str[4];
int ret;
setlocale(LC_CTYPE, "C");
ret = swprintf(str, sizeof(str) / sizeof(*str), txt);
printf("%d\n", ret);
return 0;
}
Only a format string is used here. The call to swprintf() fails here,
too, and -1 is returned. The POSIX standard (and ANSI C99, too, though
with slightly different wording) say this: "The format is composed of
zero or more directives: ordinary wide-characters, which are simply
copied to the output stream" (from
http://www.opengroup.org/onlinepubs/009695399/functions/swprintf.html ,
section DESCRIPTION, second clause). So even copying the ordinary
wide-characters from the format string fails.
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