diff options
Diffstat (limited to 'lib/libc/locale/mbrtoc16.c')
-rw-r--r-- | lib/libc/locale/mbrtoc16.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/lib/libc/locale/mbrtoc16.c b/lib/libc/locale/mbrtoc16.c new file mode 100644 index 000000000000..a47514c3d93b --- /dev/null +++ b/lib/libc/locale/mbrtoc16.c @@ -0,0 +1,89 @@ +/*- + * Copyright (c) 2013 Ed Schouten <ed@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <uchar.h> +#include "xlocale_private.h" + +typedef struct { + char16_t trail_surrogate; + mbstate_t c32_mbstate; +} _Char16State; + +size_t +mbrtoc16_l(char16_t * __restrict pc16, const char * __restrict s, size_t n, + mbstate_t * __restrict ps, locale_t locale) +{ + _Char16State *cs; + char32_t c32; + ssize_t len; + + FIX_LOCALE(locale); + if (ps == NULL) + ps = &locale->mbrtoc16; + cs = (_Char16State *)ps; + + /* + * Call straight into mbrtoc32_l() if we don't need to return a + * character value. According to the spec, if s is a null + * pointer, the value of parameter pc16 is also ignored. + */ + if (pc16 == NULL || s == NULL) { + cs->trail_surrogate = 0; + return (mbrtoc32_l(NULL, s, n, &cs->c32_mbstate, locale)); + } + + /* Return the trail surrogate from the previous invocation. */ + if (cs->trail_surrogate >= 0xdc00 && cs->trail_surrogate <= 0xdfff) { + *pc16 = cs->trail_surrogate; + cs->trail_surrogate = 0; + return ((size_t)-3); + } + + len = mbrtoc32_l(&c32, s, n, &cs->c32_mbstate, locale); + if (len >= 0) { + if (c32 < 0x10000) { + /* Fits in one UTF-16 character. */ + *pc16 = c32; + } else { + /* Split up in a surrogate pair. */ + c32 -= 0x10000; + *pc16 = 0xd800 | (c32 >> 10); + cs->trail_surrogate = 0xdc00 | (c32 & 0x3ff); + } + } + return (len); +} + +size_t +mbrtoc16(char16_t * __restrict pc16, const char * __restrict s, size_t n, + mbstate_t * __restrict ps) +{ + + return (mbrtoc16_l(pc16, s, n, ps, __get_locale())); +} |