diplodocus.org Git - nmh/blob - sbr/ssequal.c

   1
   2 /*
   3  * ssequal.c -- check if a string is a substring of another
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #include <h/mh.h>
  11
  12 /*
  13  * THIS CODE DOES NOT WORK AS ADVERTISED.
  14  * It is actually checking if s1 is a PREFIX of s2.
  15  * All calls to this function need to be checked to see
  16  * if that needs to be changed. Prefix checking is cheaper, so
  17  * should be kept if it's sufficient.
  18  */
  19
  20 /*
  21  * Check if s1 is a substring of s2.
  22  * If yes, then return 1, else return 0.
  23  */
  24
  25 int
  26 ssequal (const char *s1, const char *s2)
  27 {
  28     if (!s1)
  29         s1 = "";
  30     if (!s2)
  31         s2 = "";
  32
  33     while (*s1)
  34         if (*s1++ != *s2++)
  35             return 0;
  36     return 1;
  37 }