1 /*- 2 * Copyright (c) 2013 Ed Schouten <ed@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <errno.h> 31 #include <uchar.h> 32 #include "xlocale_private.h" 33 34 typedef struct { 35 char16_t lead_surrogate; 36 mbstate_t c32_mbstate; 37 } _Char16State; 38 39 size_t 40 c16rtomb_l(char * __restrict s, char16_t c16, mbstate_t * __restrict ps, 41 locale_t locale) 42 { 43 _Char16State *cs; 44 char32_t c32; 45 46 FIX_LOCALE(locale); 47 if (ps == NULL) 48 ps = &locale->c16rtomb; 49 cs = (_Char16State *)ps; 50 51 /* If s is a null pointer, the value of parameter c16 is ignored. */ 52 if (s == NULL) { 53 c32 = 0; 54 } else if (cs->lead_surrogate >= 0xd800 && 55 cs->lead_surrogate <= 0xdbff) { 56 /* We should see a trail surrogate now. */ 57 if (c16 < 0xdc00 || c16 > 0xdfff) { 58 errno = EILSEQ; 59 return ((size_t)-1); 60 } 61 c32 = 0x10000 + ((cs->lead_surrogate & 0x3ff) << 10 | 62 (c16 & 0x3ff)); 63 } else if (c16 >= 0xd800 && c16 <= 0xdbff) { 64 /* Store lead surrogate for next invocation. */ 65 cs->lead_surrogate = c16; 66 return (0); 67 } else { 68 /* Regular character. */ 69 c32 = c16; 70 } 71 cs->lead_surrogate = 0; 72 73 return (c32rtomb_l(s, c32, &cs->c32_mbstate, locale)); 74 } 75 76 size_t 77 c16rtomb(char * __restrict s, char16_t c16, mbstate_t * __restrict ps) 78 { 79 80 return (c16rtomb_l(s, c16, ps, __get_locale())); 81 } 82