mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
b41f91c658
The cosmopolitan command interpreter now has 13 builtin commands, variable support, support for ; / && / || syntax, asynchronous support, and plenty of unit tests with bug fixes. This change fixes a bug in posix_spawn() with null envp arg. strace logging now uses atomic writes for scatter functions. Breaking change renaming GetCpuCount() to _getcpucount(). TurfWar is now updated to use the new token bucket algorithm. WIN32 affinity masks now inherit across fork() and execve().
76 lines
3.2 KiB
C
76 lines
3.2 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/assert.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/nexgen32e/x86feature.h"
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#include "libc/str/str.h"
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typedef char xmm_t __attribute__((__vector_size__(16), __aligned__(16)));
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static inline const char *strchr_pure(const char *s, int c) {
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for (;; ++s) {
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if ((*s & 255) == (c & 255)) return s;
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if (!*s) return 0;
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}
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}
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noasan static inline const char *strchr_sse(const char *s, unsigned char c) {
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unsigned k;
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unsigned m;
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xmm_t v, *p;
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xmm_t z = {0};
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xmm_t n = {c, c, c, c, c, c, c, c, c, c, c, c, c, c, c, c};
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k = (uintptr_t)s & 15;
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p = (const xmm_t *)((uintptr_t)s & -16);
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v = *p;
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m = __builtin_ia32_pmovmskb128((v == z) | (v == n));
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m >>= k;
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m <<= k;
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while (!m) {
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v = *++p;
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m = __builtin_ia32_pmovmskb128((v == z) | (v == n));
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}
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m = __builtin_ctzl(m);
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s = (const char *)p + m;
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if (c && !*s) s = 0;
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return s;
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}
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/**
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* Returns pointer to first instance of character.
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*
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* @param s is a NUL-terminated string
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* @param c is masked with 255 as byte to search for
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* @return pointer to first instance of c or NULL if not found
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* noting that if c is NUL we return pointer to terminator
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* @asyncsignalsafe
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* @vforksafe
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*/
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char *strchr(const char *s, int c) {
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const char *r;
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if (X86_HAVE(SSE)) {
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if (IsAsan()) __asan_verify(s, 1);
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r = strchr_sse(s, c);
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} else {
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r = strchr_pure(s, c);
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}
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_unassert(!r || *r || !(c & 255));
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return (char *)r;
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}
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