#
#define BUFSIZ 512
/*
 * CPCMNT copies COUNT characters from file descriptors FDIN to FDOUT,
 * returning the number of bytes copied or -1 on errors.
 * cc -c -O cpcmnt.c
 * Written by Joe Pallas and Robert L. Kirby on September 18, 1980.
 */
int cpcmnt(fdin, fdout, count)
int count;	/* an unsigned(?) integer */
int fdin, fdout;
{
	register char *p;
	register unsigned int numread; 
	register int total;
	char buf[BUFSIZ];

	p = buf;
	for(total = 0; numread = count - total; total += numread) {
		if(numread > BUFSIZ)
			numread = BUFSIZ;
		if((numread = read(fdin, p, numread)) == 0)
			break;
		if(numread == -1 || write(fdout, p, numread) != numread)
			return(-1);
	}
	return(total);
}