1 /* $OpenBSD: vasprintf.c,v 1.4 1998/06/21 22:13:47 millert Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 7 * All rights reserved. 8 * 9 * Copyright (c) 2011 The FreeBSD Foundation 10 * 11 * Portions of this software were developed by David Chisnall 12 * under sponsorship from the FreeBSD Foundation. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. The name of the author may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 26 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 27 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 28 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 29 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37 #include <errno.h> 38 #include <limits.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <wchar.h> 42 #include "local.h" 43 #include "xlocale_private.h" 44 45 int 46 vswprintf_l(wchar_t * __restrict s, size_t n, locale_t locale, 47 const wchar_t * __restrict fmt, __va_list ap) 48 { 49 static const mbstate_t initial; 50 mbstate_t mbs; 51 FILE f = FAKE_FILE; 52 char *mbp; 53 int ret, sverrno; 54 size_t nwc; 55 FIX_LOCALE(locale); 56 57 if (n == 0) { 58 errno = EINVAL; 59 return (-1); 60 } 61 if (n - 1 > INT_MAX) { 62 errno = EOVERFLOW; 63 *s = L'\0'; 64 return (-1); 65 } 66 67 f._flags = __SWR | __SSTR | __SALC; 68 f._bf._base = f._p = (unsigned char *)malloc(128); 69 if (f._bf._base == NULL) { 70 errno = ENOMEM; 71 *s = L'\0'; 72 return (-1); 73 } 74 f._bf._size = f._w = 127; /* Leave room for the NUL */ 75 ret = __vfwprintf(&f, locale, fmt, ap); 76 if (ret < 0) { 77 sverrno = errno; 78 free(f._bf._base); 79 errno = sverrno; 80 *s = L'\0'; 81 return (-1); 82 } 83 *f._p = '\0'; 84 mbp = f._bf._base; 85 /* 86 * XXX Undo the conversion from wide characters to multibyte that 87 * fputwc() did in __vfwprintf(). 88 */ 89 mbs = initial; 90 nwc = mbsrtowcs_l(s, (const char **)&mbp, n, &mbs, locale); 91 free(f._bf._base); 92 if (nwc == (size_t)-1) { 93 errno = EILSEQ; 94 *s = L'\0'; 95 return (-1); 96 } 97 if (nwc == n) { 98 s[n - 1] = L'\0'; 99 errno = EOVERFLOW; 100 return (-1); 101 } 102 103 return (ret); 104 } 105 int 106 vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt, 107 __va_list ap) 108 { 109 return vswprintf_l(s, n, __get_locale(), fmt, ap); 110 } 111