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- /* strstr.c -- return the offset of one string within another
- Copyright (C) 1989, 1990 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Author:
- Mike Rendell Department of Computer Science
- michael@garfield.mun.edu Memorial University of Newfoundland
- ..!uunet!garfield!michael St. John's, Nfld., Canada
- (709) 737-4550 A1C 5S7
- */
-
- /* Return the starting address of string S2 in S1;
- return 0 if it is not found. */
-
- char *
- strstr (s1, s2)
- char *s1;
- char *s2;
- {
- int i;
- char *p1;
- char *p2;
- char *s = s1;
-
- for (p2 = s2, i = 0; *s; p2 = s2, i++, s++)
- {
- for (p1 = s; *p1 && *p2 && *p1 == *p2; p1++, p2++)
- ;
- if (!*p2)
- break;
- }
- if (!*p2)
- return s1 + i;
-
- return 0;
- }
-