/*
 * strstr - find first occurrence of wanted in s
 */

#define  NULL      0

char *                                 /* found string, or NULL if none */
strstr(s, wanted)
CONST char *s;
CONST char *wanted;
{
         register CONST char *scan;
         register SIZET len;
         register char firstc;
         extern int strcmp();
         extern SIZET strlen();

         /*
          * The odd placement of the two tests is so "" is findable.
          * Also, we inline the first char for speed.
          * The ++ on scan has been moved down for optimization.
          */
         firstc = *wanted;
         len = strlen(wanted);
         for (scan = s; *scan != firstc || strncmp(scan, wanted, len) != 0; )
                   if (*scan++ == '\0')
                             return(NULL);
         return(scan);
}