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tgets.c revision 1.3 
      1 /*	$NetBSD: tgets.c,v 1.3 1999/06/28 01:20:45 sakamoto 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)gets.c	8.1 (Berkeley) 6/11/93
     36  */
     37 
     38 #include <stand.h>
     39 #include "boot.h"
     40 
     41 int
     42 tgets(buf)
     43 	char *buf;
     44 {
     45 	register int c;
     46 	register char *lp;
     47 
     48 #ifdef	USE_SCAN
     49 	int i;
     50 
     51 #define	SCANWAIT	10000
     52 #define	PWAIT		500
     53 	for (i = 0; i < PWAIT; i++) {
     54 		if ((c = cnscan()) != -1)
     55 			goto next;
     56 		delay(SCANWAIT);
     57 	}
     58 	return (-1);
     59 next:
     60 #else
     61 	c = getchar();
     62 #endif
     63 	for (lp = buf;; c = getchar()) {
     64 		switch (c & 0177) {
     65 		case '\n':
     66 		case '\r':
     67 			*lp = '\0';
     68 			putchar('\n');
     69 			return 0;
     70 		case '\b':
     71 		case '\177':
     72 			if (lp > buf) {
     73 				lp--;
     74 				putchar('\b');
     75 				putchar(' ');
     76 				putchar('\b');
     77 			}
     78 			break;
     79 		case 'r'&037: {
     80 			register char *p;
     81 
     82 			putchar('\n');
     83 			for (p = buf; p < lp; ++p)
     84 				putchar(*p);
     85 			break;
     86 		}
     87 		case 'u'&037:
     88 		case 'w'&037:
     89 			lp = buf;
     90 			putchar('\n');
     91 			break;
     92 		default:
     93 			*lp++ = c;
     94 			putchar(c);
     95 		}
     96 	}
     97 }
     98