lib/ansi/strstr.c

   1 /*
   2  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
   3  * See the copyright notice in the ACK home directory, in the file "Copyright".
   4  */
   5 /* $Header$ */
   6
   7 #include        <string.h>
   8
   9 char *
  10 strstr(register const char *s, register const char *wanted)
  11 {
  12         register const size_t len = strlen(wanted);
  13
  14         if (len == 0) return (char *)s;
  15         while (*s != *wanted || strncmp(s, wanted, len))
  16                 if (*s++ == '\0')
  17                         return (char *)NULL;
  18         return (char *)s;
  19 }