mirror of
https://github.com/jart/cosmopolitan.git
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86 lines
3.4 KiB
C
86 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/intrin/bsr.h"
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#include "libc/mem/mem.h"
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#include "libc/serialize.h"
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#include "libc/str/str.h"
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#include "libc/str/thompike.h"
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#include "libc/str/utf16.h"
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#include "libc/x/x.h"
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#include "third_party/intel/emmintrin.internal.h"
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/**
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* Transcodes UTF-16 to UTF-8.
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*
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* @param p is input value
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* @param n if -1 implies strlen
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* @param z if non-NULL receives output length
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*/
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char *utf16to8(const char16_t *p, size_t n, size_t *z) {
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unsigned w;
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char *r, *q;
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wint_t x, y;
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const char16_t *e;
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if (z)
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*z = 0;
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if (n == -1)
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n = p ? strlen16(p) : 0;
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if ((q = r = malloc(n * 4 + 8 + 1))) {
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for (e = p + n; p < e;) {
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#if defined(__x86_64__)
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if (p + 8 < e) {
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do {
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__m128i v1 = _mm_loadu_si128((__m128i *)p);
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__m128i v2 = _mm_cmpgt_epi16(v1, _mm_setzero_si128());
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__m128i v3 = _mm_cmpgt_epi16(v1, _mm_set1_epi16(127));
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v2 = _mm_andnot_si128(v3, v2);
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if (_mm_movemask_epi8(v2) != 0xFFFF)
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break;
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_mm_storel_epi64((__m128i *)q, _mm_packs_epi16(v1, v1));
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p += 8;
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q += 8;
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} while (p + 8 < e);
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}
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#endif
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x = *p++ & 0xffff;
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if (!IsUcs2(x)) {
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if (p < e) {
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y = *p++ & 0xffff;
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x = MergeUtf16(x, y);
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} else {
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x = 0xFFFD;
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}
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}
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if (x < 0200) {
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*q++ = x;
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} else {
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w = tpenc(x);
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WRITE64LE(q, w);
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q += bsr(w) >> 3;
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q += 1;
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}
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}
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if (z)
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*z = q - r;
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*q++ = '\0';
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if ((q = realloc(r, (q - r) * 1)))
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r = q;
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}
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return r;
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}
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