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
90 lines
2.8 KiB
C
90 lines
2.8 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 <uchar.h>
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#include "xlocale_private.h"
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typedef struct {
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char16_t trail_surrogate;
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mbstate_t c32_mbstate;
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} _Char16State;
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size_t
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mbrtoc16_l(char16_t * __restrict pc16, const char * __restrict s, size_t n,
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mbstate_t * __restrict ps, locale_t locale)
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{
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_Char16State *cs;
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char32_t c32;
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ssize_t len;
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FIX_LOCALE(locale);
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if (ps == NULL)
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ps = &locale->mbrtoc16;
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cs = (_Char16State *)ps;
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/*
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* Call straight into mbrtoc32_l() if we don't need to return a
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* character value. According to the spec, if s is a null
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* pointer, the value of parameter pc16 is also ignored.
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*/
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if (pc16 == NULL || s == NULL) {
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cs->trail_surrogate = 0;
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return (mbrtoc32_l(NULL, s, n, &cs->c32_mbstate, locale));
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}
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/* Return the trail surrogate from the previous invocation. */
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if (cs->trail_surrogate >= 0xdc00 && cs->trail_surrogate <= 0xdfff) {
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*pc16 = cs->trail_surrogate;
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cs->trail_surrogate = 0;
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return ((size_t)-3);
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}
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len = mbrtoc32_l(&c32, s, n, &cs->c32_mbstate, locale);
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if (len >= 0) {
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if (c32 < 0x10000) {
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/* Fits in one UTF-16 character. */
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*pc16 = c32;
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} else {
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/* Split up in a surrogate pair. */
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c32 -= 0x10000;
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*pc16 = 0xd800 | (c32 >> 10);
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cs->trail_surrogate = 0xdc00 | (c32 & 0x3ff);
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}
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}
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return (len);
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}
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size_t
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mbrtoc16(char16_t * __restrict pc16, const char * __restrict s, size_t n,
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mbstate_t * __restrict ps)
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{
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return (mbrtoc16_l(pc16, s, n, ps, __get_locale()));
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}
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