mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
f7ae50462a
- Fix unused local variable errors - Remove yoinks from sigaction() header - Add nox87 and aarch64 to github actions - Fix cosmocc -fportcosmo in linking mode - It's now possible to build `make m=llvm o/llvm/libc`
88 lines
3.6 KiB
C
88 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 net 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/mem/mem.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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/**
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* Transcodes UTF-8 to UTF-16.
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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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char16_t *utf8to16(const char *p, size_t n, size_t *z) {
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size_t i;
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wint_t x, a, b;
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char16_t *r, *q;
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unsigned m, j, w;
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if (z) *z = 0;
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if (n == -1) n = p ? strlen(p) : 0;
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if ((q = r = malloc((n + 16) * sizeof(char16_t) * 2 + sizeof(char16_t)))) {
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for (i = 0; i < n;) {
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#if defined(__SSE2__) && defined(__GNUC__) && !defined(__STRICT_ANSI__) && \
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!defined(__llvm__) && !defined(__chibicc__)
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if (i + 16 < n) {
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typedef char xmm_t __attribute__((__vector_size__(16), __aligned__(1)));
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xmm_t vi, vz = {0};
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do {
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vi = *(const xmm_t *)(p + i);
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*(xmm_t *)(q + 0) = __builtin_ia32_punpcklbw128(vi, vz);
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*(xmm_t *)(q + 8) = __builtin_ia32_punpckhbw128(vi, vz);
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if (!(m = __builtin_ia32_pmovmskb128(vi > vz) ^ 0xffff)) {
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i += 16;
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q += 16;
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} else {
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m = __builtin_ctzl(m);
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i += m;
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q += m;
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break;
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}
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} while (i + 16 < n);
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}
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#endif
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x = p[i++] & 0xff;
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if (x >= 0300) {
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a = ThomPikeByte(x);
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m = ThomPikeLen(x) - 1;
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if (i + m <= n) {
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for (j = 0;;) {
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b = p[i + j] & 0xff;
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if (!ThomPikeCont(b)) break;
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a = ThomPikeMerge(a, b);
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if (++j == m) {
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x = a;
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i += j;
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break;
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}
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}
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}
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}
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w = EncodeUtf16(x);
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*q++ = w;
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if ((w >>= 16)) *q++ = w;
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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) * sizeof(char16_t)))) r = q;
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}
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return r;
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}
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