1 /* Copyright (C) 1991, 92, 93, 94, 96, 97, 98 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library 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 GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
24 /* Return the first occurrence of NEEDLE in HAYSTACK. */
26 memmem (haystack
, haystack_len
, needle
, needle_len
)
33 const char *const last_possible
34 = (const char *) haystack
+ haystack_len
- needle_len
;
37 /* The first occurrence of the empty string is deemed to occur at
38 the beginning of the string. */
39 return (void *) haystack
;
41 for (begin
= (const char *) haystack
; begin
<= last_possible
; ++begin
)
42 if (begin
[0] == ((const char *) needle
)[0] &&
43 !memcmp ((const void *) &begin
[1],
44 (const void *) ((const char *) needle
+ 1),
46 return (void *) begin
;