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      1 /*	$NetBSD: tgets.c,v 1.2 2022/04/29 21:39:50 rin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  *	@(#)gets.c	8.1 (Berkeley) 6/11/93
     32  */
     33 
     34 #include <lib/libsa/stand.h>
     35 #include "boot.h"
     36 
     37 #define USE_SCAN
     38 
     39 int
     40 tgets(char *buf)
     41 {
     42 	int c;
     43 	char *lp;
     44 
     45 #ifdef	USE_SCAN
     46 	int i;
     47 
     48 #define	SCANDELAY	10000
     49 #define	SCANWAIT	500
     50 	for (i = 0; i < SCANWAIT; i++) {
     51 		if ((c = cnscan()) != -1)
     52 			goto next;
     53 		delay(SCANDELAY);
     54 	}
     55 	return -1;
     56 next:
     57 #else
     58 	c = getchar();
     59 #endif
     60 	for (lp = buf;; c = getchar()) {
     61 		switch (c & 0177) {
     62 		case '\n':
     63 		case '\r':
     64 			*lp = '\0';
     65 			putchar('\n');
     66 			return 0;
     67 		case '\b':
     68 		case '\177':
     69 			if (lp > buf) {
     70 				lp--;
     71 				putchar('\b');
     72 				putchar(' ');
     73 				putchar('\b');
     74 			}
     75 			break;
     76 		case 'r' & 037: {
     77 			char *p;
     78 
     79 			putchar('\n');
     80 			for (p = buf; p < lp; ++p)
     81 				putchar(*p);
     82 			break;
     83 		}
     84 		case 'u' & 037:
     85 		case 'w' & 037:
     86 			lp = buf;
     87 			putchar('\n');
     88 			break;
     89 		default:
     90 			*lp++ = c;
     91 			putchar(c);
     92 		}
     93 	}
     94 }
     95