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1/* $OpenBSD: vswprintf.c,v 1.8 2025/08/08 15:58:53 yasuoka Exp $ */
2/* $NetBSD: vswprintf.c,v 1.1 2005/05/14 23:51:02 christos Exp $ */
3
4/*
5 * Copyright (c) 1997 Todd C. Miller <millert@openbsd.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
21 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
22 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <errno.h>
32#include <stdio.h>
33#include <stdlib.h>
34#include <string.h>
35#include <wchar.h>
36#include <stdarg.h>
37#include "local.h"
38
39int
40vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
41 __va_list ap)
42{
43 mbstate_t mbs;
44 FILE f = FILEINIT(__SWR | __SSTR | __SALC);
45 char *mbp;
46 int ret, sverrno;
47 size_t nwc;
48
49 if (n == 0) {
50 errno = EINVAL;
51 return (-1);
52 }
53
54 f._bf._base = f._p = malloc(128);
55 if (f._bf._base == NULL) {
56 errno = ENOMEM;
57 return (-1);
58 }
59 f._bf._size = f._w = 127; /* Leave room for the NUL */
60 ret = __vfwprintf(&f, fmt, ap);
61 if (ret < 0) {
62 sverrno = errno;
63 free(f._bf._base);
64 errno = sverrno;
65 return (-1);
66 }
67 if (ret == 0) {
68 s[0] = L'\0';
69 free(f._bf._base);
70 return (0);
71 }
72 *f._p = '\0';
73 mbp = (char *)f._bf._base;
74 /*
75 * XXX Undo the conversion from wide characters to multibyte that
76 * fputwc() did in __vfwprintf().
77 */
78 bzero(&mbs, sizeof(mbs));
79 nwc = mbsrtowcs(s, (const char **)&mbp, n, &mbs);
80 free(f._bf._base);
81 if (nwc == (size_t)-1) {
82 errno = EILSEQ;
83 return (-1);
84 }
85 if (nwc == n) {
86 s[n - 1] = L'\0';
87 errno = EOVERFLOW;
88 return (-1);
89 }
90
91 return (ret);
92}
93DEF_STRONG(vswprintf);