/* Read a pipe, waiting for a full buffer */
int readp(fd, buf, reqst)
int fd;    /* File descriptor number */
char *buf; /* Input buffer */
int reqst; /* Requested byte count */

{
	/* How many bytes read sofar, and how many got each time */
	register int sofar, got, rcnt;

	sofar = 0;
	rcnt = reqst;
	do {
		got = read(fd, buf + sofar, rcnt - sofar);
		if(got == -1) return(got);
		sofar += got;  /* Increment number of characters so far */
	} while (got != 0 && sofar != rcnt);
	return(sofar);
}