1 /* $OpenBSD: vswprintf.c,v 1.4 2012/12/05 23:20:01 deraadt 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 <Todd.Miller (at) courtesan.com> 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 39 int 40 vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt, 41 __va_list ap) 42 { 43 mbstate_t mbs; 44 FILE f; 45 char *mbp; 46 int ret, sverrno; 47 size_t nwc; 48 struct __sfileext fext; 49 50 if (n == 0) { 51 errno = EINVAL; 52 return (-1); 53 } 54 55 _FILEEXT_SETUP(&f, &fext); 56 f._file = -1; 57 f._flags = __SWR | __SSTR | __SALC; 58 f._bf._base = f._p = (unsigned char *)malloc(128); 59 if (f._bf._base == NULL) { 60 errno = ENOMEM; 61 return (-1); 62 } 63 f._bf._size = f._w = 127; /* Leave room for the NUL */ 64 ret = __vfwprintf(&f, fmt, ap); 65 if (ret < 0) { 66 sverrno = errno; 67 free(f._bf._base); 68 errno = sverrno; 69 return (-1); 70 } 71 if (ret == 0) { 72 s[0] = L'\0'; 73 free(f._bf._base); 74 return (0); 75 } 76 *f._p = '\0'; 77 mbp = (char *)f._bf._base; 78 /* 79 * XXX Undo the conversion from wide characters to multibyte that 80 * fputwc() did in __vfwprintf(). 81 */ 82 bzero(&mbs, sizeof(mbs)); 83 nwc = mbsrtowcs(s, (const char **)&mbp, n, &mbs); 84 free(f._bf._base); 85 if (nwc == (size_t)-1) { 86 errno = EILSEQ; 87 return (-1); 88 } 89 if (nwc == n) { 90 s[n - 1] = L'\0'; 91 errno = EOVERFLOW; 92 return (-1); 93 } 94 95 return (ret); 96 } 97
