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https://github.com/jart/cosmopolitan.git
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8bfd56b59e
Now that these functions are behind _COSMO_SOURCE there's no reason for having the ugly underscore anymore. To use these functions, you need to pass -mcosmo to cosmocc.
91 lines
3.6 KiB
C
91 lines
3.6 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/intrin/packsswb.h"
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#include "libc/intrin/pandn.h"
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#include "libc/intrin/pcmpgtb.h"
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#include "libc/intrin/pcmpgtw.h"
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#include "libc/intrin/pmovmskb.h"
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#include "libc/intrin/punpckhbw.h"
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#include "libc/intrin/punpcklbw.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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static const int16_t kDel16[8] = {127, 127, 127, 127, 127, 127, 127, 127};
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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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int16_t v1[8], v2[8], v3[8], vz[8];
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if (z) *z = 0;
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if (n == -1) 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 (p + 8 < e) { /* 17x ascii */
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bzero(vz, 16);
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do {
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memcpy(v1, p, 16);
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pcmpgtw(v2, v1, vz);
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pcmpgtw(v3, v1, kDel16);
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pandn((void *)v2, (void *)v3, (void *)v2);
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if (pmovmskb((void *)v2) != 0xFFFF) break;
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packsswb((void *)v1, v1, v1);
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memcpy(q, v1, 8);
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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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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) *z = q - r;
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*q++ = '\0';
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if ((q = realloc(r, (q - r) * 1))) r = q;
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}
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return r;
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}
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