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- /* $OpenBSD: vswprintf.c,v 1.3 2011/04/28 17:38:46 stsp 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 <sys/cdefs.h>
- #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 = (unsigned char *)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().
- */
- memset(&mbs, 0x0, 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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