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

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