178344Sobrien/* $OpenBSD: mbtowc.c,v 1.3 2016/02/27 14:02:13 schwarze Exp $ */ 278344Sobrien 398184Sgordon/*- 478344Sobrien * Copyright (c) 2002-2004 Tim J. Robbins. 578344Sobrien * All rights reserved. 678344Sobrien * 7117020Smtm * Redistribution and use in source and binary forms, with or without 8136224Smtm * modification, are permitted provided that the following conditions 978344Sobrien * are met: 1078344Sobrien * 1. Redistributions of source code must retain the above copyright 1178344Sobrien * notice, this list of conditions and the following disclaimer. 1278344Sobrien * 2. Redistributions in binary form must reproduce the above copyright 13230099Sdougb * notice, this list of conditions and the following disclaimer in the 14197144Shrs * documentation and/or other materials provided with the distribution. 1578344Sobrien * 16197144Shrs * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17197144Shrs * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18197144Shrs * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19197144Shrs * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2098184Sgordon * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2178344Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 30#include <stdlib.h> 31#include <string.h> 32#include <wchar.h> 33#include <errno.h> 34 35int 36mbtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n) 37{ 38 static mbstate_t mbs; 39 size_t rval; 40 41 if (s == NULL) { 42 /* No support for state dependent encodings. */ 43 memset(&mbs, 0, sizeof(mbs)); 44 return (0); 45 } 46 rval = mbrtowc(pwc, s, n, &mbs); 47 48 switch (rval) { 49 case (size_t)-2: 50 errno = EILSEQ; 51 /* FALLTHROUGH */ 52 case (size_t)-1: 53 return -1; 54 default: 55 return (int)rval; 56 } 57} 58