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 * 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 0 32 __FBSDID("FreeBSD: src/lib/libc/stdio/vasprintf.c,v 1.16 2002/08/21 16:19:57 mike Exp "); 33 #endif 34 __FBSDID("$FreeBSD$"); 35 36 #include <errno.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <wchar.h> 40 #include "local.h" 41 42 int 43 vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt, 44 __va_list ap) 45 { 46 static const mbstate_t initial; 47 mbstate_t mbs; 48 FILE f; 49 struct __sFILEX ext; 50 char *mbp; 51 int ret, sverrno; 52 size_t nwc; 53 54 if (n == 0) { 55 errno = EINVAL; 56 return (-1); 57 } 58 59 f._file = -1; 60 f._flags = __SWR | __SSTR | __SALC; 61 f._bf._base = f._p = (unsigned char *)malloc(128); 62 if (f._bf._base == NULL) { 63 errno = ENOMEM; 64 return (-1); 65 } 66 f._bf._size = f._w = 127; /* Leave room for the NUL */ 67 f._extra = &ext; 68 INITEXTRA(&f); 69 ret = __vfwprintf(&f, fmt, ap); 70 if (ret < 0) { 71 sverrno = errno; 72 free(f._bf._base); 73 errno = sverrno; 74 return (-1); 75 } 76 *f._p = '\0'; 77 mbp = f._bf._base; 78 /* 79 * XXX Undo the conversion from wide characters to multibyte that 80 * fputwc() did in __vfwprintf(). 81 */ 82 mbs = initial; 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