infoexistenz

int
copy1(int fdf, int fdt, char *from, char *to)
{
	char *buf;
	long n, n1, rcount;
	int rv;
	char err[ERRMAX];

	buf = malloc(DEFB);
	/* clear any residual error */
	err[0] = '';
	errstr(err, ERRMAX);
	rv = 0;
	for(rcount=0;; rcount++) {
		n = read(fdf, buf, DEFB);
		if(n <= 0)
			break;
		n1 = write(fdt, buf, n);
		if(n1 != n) {
			fprint(2, "cp: error writing %s: %r\n", to);
			failed = 1;
			rv = -1;
			break;
		}
	}
	if(n < 0) {
		fprint(2, "cp: error reading %s: %r\n", from);
		failed = 1;
		rv = -1;
	}
	free(buf);
	return rv;
}