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tgets.c revision 1.3.36.2 
      1 /*	$NetBSD: tgets.c,v 1.3.36.2 2004/09/18 14:33:21 skrll 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 <stand.h>
     35 #include "boot.h"
     36 
     37 int
     38 tgets(buf)
     39 	char *buf;
     40 {
     41 	register int c;
     42 	register char *lp;
     43 
     44 #ifdef	USE_SCAN
     45 	int i;
     46 
     47 #define	SCANWAIT	10000
     48 #define	PWAIT		500
     49 	for (i = 0; i < PWAIT; i++) {
     50 		if ((c = cnscan()) != -1)
     51 			goto next;
     52 		delay(SCANWAIT);
     53 	}
     54 	return (-1);
     55 next:
     56 #else
     57 	c = getchar();
     58 #endif
     59 	for (lp = buf;; c = getchar()) {
     60 		switch (c & 0177) {
     61 		case '\n':
     62 		case '\r':
     63 			*lp = '\0';
     64 			putchar('\n');
     65 			return 0;
     66 		case '\b':
     67 		case '\177':
     68 			if (lp > buf) {
     69 				lp--;
     70 				putchar('\b');
     71 				putchar(' ');
     72 				putchar('\b');
     73 			}
     74 			break;
     75 		case 'r'&037: {
     76 			register char *p;
     77 
     78 			putchar('\n');
     79 			for (p = buf; p < lp; ++p)
     80 				putchar(*p);
     81 			break;
     82 		}
     83 		case 'u'&037:
     84 		case 'w'&037:
     85 			lp = buf;
     86 			putchar('\n');
     87 			break;
     88 		default:
     89 			*lp++ = c;
     90 			putchar(c);
     91 		}
     92 	}
     93 }
     94