1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2013 Ed Schouten <ed@FreeBSD.org> 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * 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 #include <errno.h> 30 #include <uchar.h> 31 #include "mblocal.h" 32 33 typedef struct { 34 char16_t lead_surrogate; 35 mbstate_t c32_mbstate; 36 } _Char16State; 37 38 size_t 39 c16rtomb_l(char * __restrict s, char16_t c16, mbstate_t * __restrict ps, 40 locale_t locale) 41 { 42 _Char16State *cs; 43 char32_t c32; 44 45 FIX_LOCALE(locale); 46 if (ps == NULL) 47 ps = &(XLOCALE_CTYPE(locale)->c16rtomb); 48 cs = (_Char16State *)ps; 49 50 /* If s is a null pointer, the value of parameter c16 is ignored. */ 51 if (s == NULL) { 52 c32 = 0; 53 } else if (cs->lead_surrogate >= 0xd800 && 54 cs->lead_surrogate <= 0xdbff) { 55 /* We should see a trail surrogate now. */ 56 if (c16 < 0xdc00 || c16 > 0xdfff) { 57 errno = EILSEQ; 58 return ((size_t)-1); 59 } 60 c32 = 0x10000 + ((cs->lead_surrogate & 0x3ff) << 10 | 61 (c16 & 0x3ff)); 62 } else if (c16 >= 0xd800 && c16 <= 0xdbff) { 63 /* Store lead surrogate for next invocation. */ 64 cs->lead_surrogate = c16; 65 return (0); 66 } else { 67 /* Regular character. */ 68 c32 = c16; 69 } 70 cs->lead_surrogate = 0; 71 72 return (c32rtomb_l(s, c32, &cs->c32_mbstate, locale)); 73 } 74 75 size_t 76 c16rtomb(char * __restrict s, char16_t c16, mbstate_t * __restrict ps) 77 { 78 79 return (c16rtomb_l(s, c16, ps, __get_locale())); 80 } 81