/*
 * memchr - search for a byte
 *
 * CHARBITS should be defined only if the compiler lacks "unsigned char".
 * It should be a mask, e.g. 0377 for an 8-bit machine.
 */

#define  NULL      0

#ifndef CHARBITS
#        define    UNSCHAR(c)          ((unsigned char)(c))
#else
#        define    UNSCHAR(c)          ((c)&CHARBITS)
#endif

VOIDSTAR
memchr(s, ucharwanted, size)
CONST VOIDSTAR s;
int ucharwanted;
SIZET size;
{
         register CONST char *scan;
         register SIZET n;
         register int uc;

         scan = s;
         uc = UNSCHAR(ucharwanted);
         for (n = size; n > 0; n--)
                   if (UNSCHAR(*scan) == uc)
                             return(scan);
                   else
                             scan++;

         return(NULL);
}