/*
 * memccpy - copy bytes up to a certain char
 *
 * 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
memccpy(dst, src, ucharstop, size)
VOIDSTAR dst;
CONST VOIDSTAR src;
SIZET size;
{
         register char *d;
         register CONST char *s;
         register SIZET n;
         register int uc;

         if (size <= 0)
                   return(NULL);

         s = src;
         d = dst;
         uc = UNSCHAR(ucharstop);
         for (n = size; n > 0; n--)
                   if (UNSCHAR(*d++ = *s++) == uc)
                             return(d);

         return(NULL);
}