/*      $NetBSD: tgets.c,v 1.2 2022/04/29 21:39:50 rin Exp $    */

/*-
 * Copyright (c) 1993
 *      The Regents of the University of California.  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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 *      @(#)gets.c      8.1 (Berkeley) 6/11/93
 */

#include <lib/libsa/stand.h>
#include "boot.h"

#define USE_SCAN

int
tgets(char *buf)
{
        int c;
        char *lp;

#ifdef  USE_SCAN
        int i;

#define SCANDELAY       10000
#define SCANWAIT        500
        for (i = 0; i < SCANWAIT; i++) {
                if ((c = cnscan()) != -1)
                        goto next;
                delay(SCANDELAY);
        }
        return -1;
next:
#else
        c = getchar();
#endif
        for (lp = buf;; c = getchar()) {
                switch (c & 0177) {
                case '\n':
                case '\r':
                        *lp = '\0';
                        putchar('\n');
                        return 0;
                case '\b':
                case '\177':
                        if (lp > buf) {
                                lp--;
                                putchar('\b');
                                putchar(' ');
                                putchar('\b');
                        }
                        break;
                case 'r' & 037: {
                        char *p;

                        putchar('\n');
                        for (p = buf; p < lp; ++p)
                                putchar(*p);
                        break;
                }
                case 'u' & 037:
                case 'w' & 037:
                        lp = buf;
                        putchar('\n');
                        break;
                default:
                        *lp++ = c;
                        putchar(c);
                }
        }
}