mirror of
https://github.com/jart/cosmopolitan.git
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c843243322
- Support deterministic stacks on OpenBSD - Support OpenBSD system call origin verification - Fix overrun by one in chibicc string token allocator - Get all chibicc tests passing under Address Sanitizer
37 lines
2.3 KiB
C
37 lines
2.3 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/str/str.h"
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/**
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* Naïve substring search implementation.
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* @see libc/alg/memmem.c
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*/
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void *tinymemmem(const void *haystack, size_t haystacksize, const void *needle,
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size_t needlesize) {
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size_t i;
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const char *p, *pe;
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for (p = haystack, pe = p + haystacksize; p < pe;) {
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for (++p, i = 0;;) {
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if (++i > needlesize) return p - 1;
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if (p == pe) break;
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if (((const char *)needle)[i - 1] != (p - 1)[i - 1]) break;
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}
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}
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return !haystacksize && !needlesize ? haystack : NULL;
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}
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