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      1 /*	$NetBSD: tgets.c,v 1.9 2022/04/29 20:48:26 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 int
     38 tgets(char *buf)
     39 {
     40 	register int c;
     41 	register char *lp;
     42 
     43 #ifdef	USE_SCAN
     44 	int i;
     45 
     46 #define	SCANDELAY	10000
     47 #define	SCANWAIT	500
     48 	for (i = 0; i < SCANWAIT; i++) {
     49 		if ((c = cnscan()) != -1)
     50 			goto next;
     51 		delay(SCANDELAY);
     52 	}
     53 	return -1;
     54 next:
     55 #else
     56 	c = getchar();
     57 #endif
     58 	for (lp = buf;; c = getchar()) {
     59 		switch (c & 0177) {
     60 		case '\n':
     61 		case '\r':
     62 			*lp = '\0';
     63 			putchar('\n');
     64 			return 0;
     65 		case '\b':
     66 		case '\177':
     67 			if (lp > buf) {
     68 				lp--;
     69 				putchar('\b');
     70 				putchar(' ');
     71 				putchar('\b');
     72 			}
     73 			break;
     74 		case 'r' & 037: {
     75 			register char *p;
     76 
     77 			putchar('\n');
     78 			for (p = buf; p < lp; ++p)
     79 				putchar(*p);
     80 			break;
     81 		}
     82 		case 'u' & 037:
     83 		case 'w' & 037:
     84 			lp = buf;
     85 			putchar('\n');
     86 			break;
     87 		default:
     88 			*lp++ = c;
     89 			putchar(c);
     90 		}
     91 	}
     92 }
     93