1 /* Copyright (C) 1991,92,93,94,96,97,98,2000,2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License along
15 with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
22 # define __builtin_expect(expr, val) (expr)
27 /* Return the first occurrence of NEEDLE in HAYSTACK. */
29 memmem (haystack, haystack_len, needle, needle_len)
36 const char *const last_possible
37 = (const char *) haystack + haystack_len - needle_len;
40 /* The first occurrence of the empty string is deemed to occur at
41 the beginning of the string. */
42 return (void *) haystack;
44 /* Sanity check, otherwise the loop might search through the whole
46 if (__builtin_expect (haystack_len < needle_len, 0))
49 for (begin = (const char *) haystack; begin <= last_possible; ++begin)
50 if (begin[0] == ((const char *) needle)[0] &&
51 !memcmp ((const void *) &begin[1],
52 (const void *) ((const char *) needle + 1),
54 return (void *) begin;