/*      $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;
                }
        }
}