1 /* $NetBSD: vswprintf.c,v 1.1 2005/05/14 23:51:02 christos Exp $ */ 2 /* $DragonFly: src/lib/libc/stdio/vswprintf.c,v 1.2 2006/03/02 18:05:30 joerg Exp $ */ 3 4 /* 5 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@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 <stdarg.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <wchar.h> 37 38 #include "local.h" 39 #include "priv_stdio.h" 40 41 int 42 vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt, 43 va_list ap) 44 { 45 static const mbstate_t initial; 46 mbstate_t mbs; 47 FILE f; 48 char *mbp; 49 int ret, sverrno; 50 size_t nwc; 51 52 if (n == 0) { 53 errno = EINVAL; 54 return (-1); 55 } 56 57 f.pub._fileno = -1; 58 f.pub._flags = __SWR | __SSTR | __SALC; 59 f._bf._base = f.pub._p = (unsigned char *)malloc(128); 60 if (f._bf._base == NULL) { 61 errno = ENOMEM; 62 return (-1); 63 } 64 f._bf._size = f.pub._w = 127; /* Leave room for the NUL */ 65 f._up = NULL; 66 f.fl_mutex = PTHREAD_MUTEX_INITIALIZER; 67 f.fl_owner = NULL; 68 f.fl_count = 0; 69 memset(WCIO_GET(&f), 0, sizeof(struct wchar_io_data)); 70 ret = __vfwprintf_unlocked(&f, fmt, ap); 71 if (ret < 0) { 72 sverrno = errno; 73 free(f._bf._base); 74 errno = sverrno; 75 return (-1); 76 } 77 *f.pub._p = '\0'; 78 mbp = (char *)f._bf._base; 79 /* 80 * XXX Undo the conversion from wide characters to multibyte that 81 * fputwc() did in __vfwprintf(). 82 */ 83 mbs = initial; 84 nwc = mbsrtowcs(s, (const char **)&mbp, n, &mbs); 85 free(f._bf._base); 86 if (nwc == (size_t)-1) { 87 errno = EILSEQ; 88 return (-1); 89 } 90 if (nwc == n) { 91 s[n - 1] = L'\0'; 92 errno = EOVERFLOW; 93 return (-1); 94 } 95 96 return (ret); 97 } 98