compat/strrstr.c

   1 /*
   2 **  Copyright 1998-2002 University of Illinois Board of Trustees
   3 **  Copyright 1998-2002 Mark D. Roth
   4 **  All rights reserved.
   5 **
   6 **  strrstr.c - strrstr() function for compatibility library
   7 **
   8 **  Mark D. Roth <roth@uiuc.edu>
   9 **  Campus Information Technologies and Educational Services
  10 **  University of Illinois at Urbana-Champaign
  11 */
  12
  13 #include <stdio.h>
  14 #include <sys/types.h>
  15
  16 #include <string.h>
  17
  18
  19 /*
  20 ** find the last occurrance of find in string
  21 */
  22 char *
  23 strrstr(char *string, char *find)
  24 {
  25         size_t stringlen, findlen;
  26         char *cp;
  27
  28         findlen = strlen(find);
  29         stringlen = strlen(string);
  30         if (findlen > stringlen)
  31                 return NULL;
  32
  33         for (cp = string + stringlen - findlen; cp >= string; cp--)
  34                 if (strncmp(cp, find, findlen) == 0)
  35                         return cp;
  36
  37         return NULL;
  38 }
  39
  40