1 /* $OpenBSD: vasprintf.c,v 1.4 1998/06/21 22:13:47 millert Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 5 * All rights reserved. 6 * 7 * Copyright (c) 2011 The FreeBSD Foundation 8 * All rights reserved. 9 * Portions of this software were developed by David Chisnall 10 * under sponsorship from the FreeBSD Foundation. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 24 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 25 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 26 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 * 34 * $FreeBSD: head/lib/libc/stdio/vswprintf.c 234531 2012-04-21 06:10:18Z das $ 35 */ 36 37 #include <errno.h> 38 #include <limits.h> 39 #include <pthread.h> /* for FAKE_FILE PTHREAD_MUTEX_INITIALIZER */ 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <wchar.h> 43 #include "local.h" 44 #include "xlocale_private.h" 45 46 int 47 vswprintf_l(wchar_t * __restrict s, size_t n, locale_t locale, 48 const wchar_t * __restrict fmt, __va_list ap) 49 { 50 static const mbstate_t initial; 51 mbstate_t mbs; 52 FILE f = FAKE_FILE; 53 char *mbp; 54 int ret, sverrno; 55 size_t nwc; 56 FIX_LOCALE(locale); 57 58 if (n == 0) { 59 errno = EINVAL; 60 return (-1); 61 } 62 if (n - 1 > INT_MAX) { 63 errno = EOVERFLOW; 64 *s = L'\0'; 65 return (-1); 66 } 67 68 f.pub._flags = __SWR | __SSTR | __SALC; 69 f._bf._base = f.pub._p = (unsigned char *)malloc(128); 70 if (f._bf._base == NULL) { 71 errno = ENOMEM; 72 *s = L'\0'; 73 return (-1); 74 } 75 f._bf._size = f.pub._w = 127; /* Leave room for the NUL */ 76 ret = __vfwprintf(&f, locale, fmt, ap); 77 if (ret < 0) { 78 sverrno = errno; 79 free(f._bf._base); 80 errno = sverrno; 81 *s = L'\0'; 82 return (-1); 83 } 84 *f.pub._p = '\0'; 85 mbp = f._bf._base; 86 /* 87 * XXX Undo the conversion from wide characters to multibyte that 88 * fputwc() did in __vfwprintf(). 89 */ 90 mbs = initial; 91 nwc = mbsrtowcs_l(s, (const char **)&mbp, n, &mbs, locale); 92 free(f._bf._base); 93 if (nwc == (size_t)-1) { 94 errno = EILSEQ; 95 *s = L'\0'; 96 return (-1); 97 } 98 if (nwc == n) { 99 s[n - 1] = L'\0'; 100 errno = EOVERFLOW; 101 return (-1); 102 } 103 104 return (ret); 105 } 106 int 107 vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt, 108 __va_list ap) 109 { 110 return vswprintf_l(s, n, __get_locale(), fmt, ap); 111 } 112