/*	$OpenBSD: getsn.c,v 1.7 2018/04/25 11:15:58 dlg Exp $	*/

/*
 * Copyright (c) 1996 Theo de Raadt
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/systm.h>
#include <dev/cons.h>

size_t
getsn(char *cp, size_t size)
{
	size_t len = 0;
	int  c;
	char *lp = cp;

	while (1) {
		c = cngetc();
		switch (c) {
		case '\n':
		case '\r':
			printf("\n");
			*lp++ = '\0';
			return (len);
		case '\b':
		case '\177':
			if (len) {
				printf("\b \b");
				--lp;
				--len;
			}
			break;
		case 'u' & 037:
			while (len) {
				printf("\b \b");
				--lp;
				--len;
			}
			break;
		case '\t':
			c = ' ';
		default:
			if (len + 1 >= size || c < ' ') {
				printf("\007");
				break;
			}
			printf("%c", c);
			++len;
			*lp++ = c;
		}
	}
}