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comparison lib/strstr.c @ 5:41c9d08b09d7

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Initial revision
author Jim Meyering <jim@meyering.net>
date Sat, 31 Oct 1992 20:42:48 +0000
parents
children 91cbd5d6f7d4 9ef1f8f1109f
comparison
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4:9087e62f9efd 5:41c9d08b09d7
1 /* strstr.c -- return the offset of one string within another
2 Copyright (C) 1989, 1990 Free Software Foundation, Inc.
3
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)
7 any later version.
8
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.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
17
18 /* Author:
19 Mike Rendell Department of Computer Science
20 michael@garfield.mun.edu Memorial University of Newfoundland
21 ..!uunet!garfield!michael St. John's, Nfld., Canada
22 (709) 737-4550 A1C 5S7
23 */
24
25 /* Return the starting address of string S2 in S1;
26 return 0 if it is not found. */
27
28 char *
29 strstr (s1, s2)
30 char *s1;
31 char *s2;
32 {
33 int i;
34 char *p1;
35 char *p2;
36 char *s = s1;
37
38 for (p2 = s2, i = 0; *s; p2 = s2, i++, s++)
39 {
40 for (p1 = s; *p1 && *p2 && *p1 == *p2; p1++, p2++)
41 ;
42 if (!*p2)
43 break;
44 }
45 if (!*p2)
46 return s1 + i;
47
48 return 0;
49 }