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lrzsz ver 0.12.20

    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 <michael@cs.mun.ca>.  */
   19: 
   20: /* Return the starting address of string S2 in S1;
   21:    return 0 if it is not found. */
   22: 
   23: char *
   24: strstr (s1, s2)
   25:      char *s1;
   26:      char *s2;
   27: {
   28:   int i;
   29:   char *p1;
   30:   char *p2;
   31:   char *s = s1;
   32: 
   33:   for (p2 = s2, i = 0; *s; p2 = s2, i++, s++)
   34:     {
   35:       for (p1 = s; *p1 && *p2 && *p1 == *p2; p1++, p2++)
   36: 	;
   37:       if (!*p2)
   38: 	break;
   39:     }
   40:   if (!*p2)
   41:     return s1 + i;
   42: 
   43:   return 0;
   44: }