50c77c6e8b
The <uchar.h> header, part of C11, adds a small number of utility functions for 16/32-bit "universal" characters, which may or may not be UTF-16/32. As our wchar_t is already ISO 10646, simply add light-weight wrappers around wcrtomb() and mbrtowc(). While there, also add (non-yet-standard) _l functions, similar to the ones we already have for the other locale-dependent functions. Reviewed by: theraven
82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/*-
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* Copyright (c) 2013 Ed Schouten <ed@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <errno.h>
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#include <uchar.h>
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#include "xlocale_private.h"
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typedef struct {
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char16_t lead_surrogate;
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mbstate_t c32_mbstate;
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} _Char16State;
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size_t
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c16rtomb_l(char * __restrict s, char16_t c16, mbstate_t * __restrict ps,
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locale_t locale)
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{
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_Char16State *cs;
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char32_t c32;
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FIX_LOCALE(locale);
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if (ps == NULL)
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ps = &locale->c16rtomb;
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cs = (_Char16State *)ps;
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/* If s is a null pointer, the value of parameter c16 is ignored. */
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if (s == NULL) {
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c32 = 0;
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} else if (cs->lead_surrogate >= 0xd800 &&
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cs->lead_surrogate <= 0xdbff) {
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/* We should see a trail surrogate now. */
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if (c16 < 0xdc00 || c16 > 0xdfff) {
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errno = EILSEQ;
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return ((size_t)-1);
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}
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c32 = 0x10000 + ((cs->lead_surrogate & 0x3ff) << 10 |
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(c16 & 0x3ff));
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} else if (c16 >= 0xd800 && c16 <= 0xdbff) {
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/* Store lead surrogate for next invocation. */
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cs->lead_surrogate = c16;
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return (0);
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} else {
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/* Regular character. */
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c32 = c16;
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}
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cs->lead_surrogate = 0;
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return (c32rtomb_l(s, c32, &cs->c32_mbstate, locale));
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}
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size_t
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c16rtomb(char * __restrict s, char16_t c16, mbstate_t * __restrict ps)
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{
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return (c16rtomb_l(s, c16, ps, __get_locale()));
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}
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