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 #include "ssequal.h"
  10
  11 /*
  12  * THIS CODE DOES NOT WORK AS ADVERTISED.
  13  * It is actually checking if s1 is a PREFIX of s2.
  14  * All calls to this function need to be checked to see
  15  * if that needs to be changed. Prefix checking is cheaper, so
  16  * should be kept if it's sufficient.
  17  */
  18
  19 /*
  20  * Check if s1 is a substring of s2.
  21  * If yes, then return 1, else return 0.
  22  */
  23
  24 int
  25 ssequal (const char *s1, const char *s2)
  26 {
  27     if (!s1)
  28         s1 = "";
  29     if (!s2)
  30         s2 = "";
  31
  32     while (*s1)
  33         if (*s1++ != *s2++)
  34             return 0;
  35     return 1;
  36 }