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/* $OpenBSD: vswprintf.c,v 1.5 2015/08/20 21:49:29 deraadt Exp $ */
/* $NetBSD: vswprintf.c,v 1.1 2005/05/14 23:51:02 christos Exp $ */
/*
* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <stdarg.h>
#include "local.h"
int
vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
__va_list ap)
{
mbstate_t mbs;
FILE f;
char *mbp;
int ret, sverrno;
size_t nwc;
struct __sfileext fext;
if (n == 0) {
errno = EINVAL;
return (-1);
}
_FILEEXT_SETUP(&f, &fext);
f._file = -1;
f._flags = __SWR | __SSTR | __SALC;
f._bf._base = f._p = malloc(128);
if (f._bf._base == NULL) {
errno = ENOMEM;
return (-1);
}
f._bf._size = f._w = 127; /* Leave room for the NUL */
ret = __vfwprintf(&f, fmt, ap);
if (ret < 0) {
sverrno = errno;
free(f._bf._base);
errno = sverrno;
return (-1);
}
if (ret == 0) {
s[0] = L'\0';
free(f._bf._base);
return (0);
}
*f._p = '\0';
mbp = (char *)f._bf._base;
/*
* XXX Undo the conversion from wide characters to multibyte that
* fputwc() did in __vfwprintf().
*/
bzero(&mbs, sizeof(mbs));
nwc = mbsrtowcs(s, (const char **)&mbp, n, &mbs);
free(f._bf._base);
if (nwc == (size_t)-1) {
errno = EILSEQ;
return (-1);
}
if (nwc == n) {
s[n - 1] = L'\0';
errno = EOVERFLOW;
return (-1);
}
return (ret);
}
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