mirror of
https://github.com/jart/cosmopolitan.git
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d7733579d3
The amalgamated release is now confirmed to be working with Clang, including its integrated assembler. Fixes #41
62 lines
2.8 KiB
C
62 lines
2.8 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 2020 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/pcmpeqb.h"
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#include "libc/intrin/pmovmskb.h"
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#include "libc/intrin/pshufd.h"
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#include "libc/intrin/punpcklbw.h"
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#include "libc/intrin/punpcklwd.h"
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#include "libc/nexgen32e/hascharacter.internal.h"
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#include "libc/str/str.h"
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#define V(p) (void *)(p)
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/**
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* Returns prefix length, consisting of chars not in reject.
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* a.k.a. Return index of first byte that's in charset.
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*
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* @param reject is nul-terminated character set
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* @see strspn(), strtok_r()
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* @asyncsignalsafe
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*/
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size_t strcspn_pure(const char *s, const char *reject) {
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size_t i, n;
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unsigned m;
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char cv[16], sv[16];
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if ((n = strlen(reject)) < 16) {
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memset(sv, 0, 16);
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memcpy(sv, reject, n);
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for (i = 0;; ++i) {
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cv[0] = s[i];
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punpcklbw(V(cv), V(cv), V(cv));
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punpcklwd(V(cv), V(cv), V(cv));
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pshufd(V(cv), V(cv), 0);
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pcmpeqb(V(cv), V(cv), V(sv));
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if ((m = pmovmskb(V(cv)))) {
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break;
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}
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}
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return i;
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}
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for (i = 0; s[i]; ++i) {
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if (HasCharacter(s[i], reject)) {
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break;
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}
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}
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return i;
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}
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