[3365] | 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 | /* Written by Mike Rendell <[email protected]>. */
|
---|
| 19 |
|
---|
| 20 | /* Return the starting address of string S2 in S1;
|
---|
| 21 | return 0 if it is not found. */
|
---|
| 22 |
|
---|
| 23 | char *
|
---|
| 24 | strstr (char *s1, char *s2)
|
---|
| 25 | {
|
---|
| 26 | int i;
|
---|
| 27 | char *p1;
|
---|
| 28 | char *p2;
|
---|
| 29 | char *s = s1;
|
---|
| 30 |
|
---|
[9612] | 31 | for (p2 = s2, i = 0; *s; p2 = s2, ++i, ++s)
|
---|
[3365] | 32 | {
|
---|
[9612] | 33 | for (p1 = s; *p1 && *p2 && *p1 == *p2; ++p1, ++p2)
|
---|
[3365] | 34 | ;
|
---|
| 35 | if (!*p2)
|
---|
| 36 | break;
|
---|
| 37 | }
|
---|
| 38 | if (!*p2)
|
---|
| 39 | return s1 + i;
|
---|
| 40 |
|
---|
| 41 | return 0;
|
---|
| 42 | }
|
---|