1 /* Copyright (C) 1991,92,93,94,96,97,98,2000,2004,2007,2011 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. */
20 @deftypefn Supplemental void* memmem (const void *@var{haystack}, @
21 size_t @var{haystack_len} const void *@var{needle}, size_t @var{needle_len})
23 Returns a pointer to the first occurrence of @var{needle} (length
24 @var{needle_len}) in @var{haystack} (length @var{haystack_len}).
25 Returns @code{NULL} if not found.
39 # define __builtin_expect(expr, val) (expr)
44 /* Return the first occurrence of NEEDLE in HAYSTACK. */
46 memmem (const void *haystack
, size_t haystack_len
, const void *needle
,
50 const char *const last_possible
51 = (const char *) haystack
+ haystack_len
- needle_len
;
54 /* The first occurrence of the empty string is deemed to occur at
55 the beginning of the string. */
56 return (void *) haystack
;
58 /* Sanity check, otherwise the loop might search through the whole
60 if (__builtin_expect (haystack_len
< needle_len
, 0))
63 for (begin
= (const char *) haystack
; begin
<= last_possible
; ++begin
)
64 if (begin
[0] == ((const char *) needle
)[0] &&
65 !memcmp ((const void *) &begin
[1],
66 (const void *) ((const char *) needle
+ 1),
68 return (void *) begin
;
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