1 /* $NetBSD: vswprintf.c,v 1.6 2013/05/19 21:45:00 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 #if defined(LIBC_SCCS) && !defined(lint) 32 #if 0 33 __FBSDID("$FreeBSD: src/lib/libc/stdio/vswprintf.c,v 1.6 2005/02/21 19:41:44 fjoe Exp $"); 34 #else 35 __RCSID("$NetBSD: vswprintf.c,v 1.6 2013/05/19 21:45:00 christos Exp $"); 36 #endif 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include "namespace.h" 40 #include <errno.h> 41 #include <locale.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <wchar.h> 45 #include <stdarg.h> 46 47 #include "reentrant.h" 48 #include "setlocale_local.h" 49 #include "local.h" 50 51 __weak_alias(vswprintf_l, _vswprintf_l) 52 53 int 54 vswprintf_l(wchar_t * __restrict s, size_t n, locale_t loc, 55 const wchar_t * __restrict fmt, va_list ap) 56 { 57 static const mbstate_t initial; 58 mbstate_t mbs; 59 FILE f; 60 char *mbp; 61 int ret, sverrno; 62 size_t nwc; 63 struct __sfileext fext; 64 65 if (n == 0) { 66 errno = EINVAL; 67 return -1; 68 } 69 70 _FILEEXT_SETUP(&f, &fext); 71 f._file = -1; 72 f._flags = __SWR | __SSTR | __SALC; 73 f._bf._base = f._p = malloc(128); 74 if (f._bf._base == NULL) { 75 errno = ENOMEM; 76 return -1; 77 } 78 f._bf._size = f._w = 127; /* Leave room for the NUL */ 79 ret = __vfwprintf_unlocked_l(&f, loc, fmt, ap); 80 if (ret < 0) { 81 sverrno = errno; 82 free(f._bf._base); 83 errno = sverrno; 84 return -1; 85 } 86 *f._p = '\0'; 87 mbp = (char *)f._bf._base; 88 /* 89 * XXX Undo the conversion from wide characters to multibyte that 90 * fputwc() did in __vfwprintf(). 91 */ 92 mbs = initial; 93 nwc = mbsrtowcs_l(s, (void *)&mbp, n, &mbs, loc); 94 free(f._bf._base); 95 if (nwc == (size_t)-1) { 96 errno = EILSEQ; 97 return -1; 98 } 99 if (nwc == n) { 100 s[n - 1] = L'\0'; 101 errno = EOVERFLOW; 102 return -1; 103 } 104 105 return ret; 106 } 107 108 int 109 vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt, 110 va_list ap) 111 { 112 return vswprintf_l(s, n, _current_locale(), fmt, ap); 113 } 114