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 <sys/cdefs.h> 30 #include <uchar.h> 31 #include "mblocal.h" 32 33 typedef struct { 34 char16_t trail_surrogate; 35 mbstate_t c32_mbstate; 36 } _Char16State; 37 38 size_t 39 mbrtoc16_l(char16_t * __restrict pc16, const char * __restrict s, size_t n, 40 mbstate_t * __restrict ps, locale_t locale) 41 { 42 _Char16State *cs; 43 char32_t c32; 44 ssize_t len; 45 46 FIX_LOCALE(locale); 47 if (ps == NULL) 48 ps = &(XLOCALE_CTYPE(locale)->mbrtoc16); 49 cs = (_Char16State *)ps; 50 51 /* 52 * Call straight into mbrtoc32_l() if we don't need to return a 53 * character value. According to the spec, if s is a null 54 * pointer, the value of parameter pc16 is also ignored. 55 */ 56 if (pc16 == NULL || s == NULL) { 57 cs->trail_surrogate = 0; 58 return (mbrtoc32_l(NULL, s, n, &cs->c32_mbstate, locale)); 59 } 60 61 /* Return the trail surrogate from the previous invocation. */ 62 if (cs->trail_surrogate >= 0xdc00 && cs->trail_surrogate <= 0xdfff) { 63 *pc16 = cs->trail_surrogate; 64 cs->trail_surrogate = 0; 65 return ((size_t)-3); 66 } 67 68 len = mbrtoc32_l(&c32, s, n, &cs->c32_mbstate, locale); 69 if (len >= 0) { 70 if (c32 < 0x10000) { 71 /* Fits in one UTF-16 character. */ 72 *pc16 = c32; 73 } else { 74 /* Split up in a surrogate pair. */ 75 c32 -= 0x10000; 76 *pc16 = 0xd800 | (c32 >> 10); 77 cs->trail_surrogate = 0xdc00 | (c32 & 0x3ff); 78 } 79 } 80 return (len); 81 } 82 83 size_t 84 mbrtoc16(char16_t * __restrict pc16, const char * __restrict s, size_t n, 85 mbstate_t * __restrict ps) 86 { 87 88 return (mbrtoc16_l(pc16, s, n, ps, __get_locale())); 89 } 90