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76 lines
2.8 KiB
76 lines
2.8 KiB
/* Copyright (C) 1991-1994, 1996-1998, 2000, 2004, 2007-2011 Free Software |
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Foundation, Inc. |
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This file is part of the GNU C Library. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 3, or (at your option) |
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any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License along |
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with this program; if not, write to the Free Software Foundation, |
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
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/* This particular implementation was written by Eric Blake, 2008. */ |
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#ifndef _LIBC |
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# include <config.h> |
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#endif |
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/* Specification of memmem. */ |
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#include <string.h> |
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#ifndef _LIBC |
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# define __builtin_expect(expr, val) (expr) |
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#endif |
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#define RETURN_TYPE void * |
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#define AVAILABLE(h, h_l, j, n_l) ((j) <= (h_l) - (n_l)) |
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#include "str-two-way.h" |
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/* Return the first occurrence of NEEDLE in HAYSTACK. Return HAYSTACK |
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if NEEDLE_LEN is 0, otherwise NULL if NEEDLE is not found in |
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HAYSTACK. */ |
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void * |
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memmem (const void *haystack_start, size_t haystack_len, |
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const void *needle_start, size_t needle_len) |
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{ |
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/* Abstract memory is considered to be an array of 'unsigned char' values, |
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not an array of 'char' values. See ISO C 99 section 6.2.6.1. */ |
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const unsigned char *haystack = (const unsigned char *) haystack_start; |
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const unsigned char *needle = (const unsigned char *) needle_start; |
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if (needle_len == 0) |
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/* The first occurrence of the empty string is deemed to occur at |
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the beginning of the string. */ |
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return (void *) haystack; |
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/* Sanity check, otherwise the loop might search through the whole |
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memory. */ |
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if (__builtin_expect (haystack_len < needle_len, 0)) |
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return NULL; |
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/* Use optimizations in memchr when possible, to reduce the search |
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size of haystack using a linear algorithm with a smaller |
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coefficient. However, avoid memchr for long needles, since we |
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can often achieve sublinear performance. */ |
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if (needle_len < LONG_NEEDLE_THRESHOLD) |
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{ |
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haystack = memchr (haystack, *needle, haystack_len); |
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if (!haystack || __builtin_expect (needle_len == 1, 0)) |
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return (void *) haystack; |
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haystack_len -= haystack - (const unsigned char *) haystack_start; |
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if (haystack_len < needle_len) |
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return NULL; |
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return two_way_short_needle (haystack, haystack_len, needle, needle_len); |
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} |
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else |
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return two_way_long_needle (haystack, haystack_len, needle, needle_len); |
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} |
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#undef LONG_NEEDLE_THRESHOLD
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