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tgets.c revision 1.1 
      1 /*	$NetBSD: tgets.c,v 1.1 1998/01/16 04:18:04 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 
     40 int
     41 tgets(buf)
     42 	char *buf;
     43 {
     44 	register int c;
     45 	register int i;
     46 	register char *lp;
     47 
     48 #ifdef	USE_SCAN
     49 #define	SCANWAIT	20000
     50 #define	PWAIT		500
     51 	for (i = 0; i < PWAIT; i++) {
     52 		if ((c = cnscan()) != -1)
     53 			goto next;
     54 		delay(SCANWAIT);
     55 	}
     56 	return (-1);
     57 next:
     58 #else
     59 	c = getchar();
     60 #endif
     61 	for (lp = buf;; c = getchar()) {
     62 		switch (c & 0177) {
     63 		case '\n':
     64 		case '\r':
     65 			*lp = '\0';
     66 			putchar('\n');
     67 			return 0;
     68 		case '\b':
     69 		case '\177':
     70 			if (lp > buf) {
     71 				lp--;
     72 				putchar('\b');
     73 				putchar(' ');
     74 				putchar('\b');
     75 			}
     76 			break;
     77 		case 'r'&037: {
     78 			register char *p;
     79 
     80 			putchar('\n');
     81 			for (p = buf; p < lp; ++p)
     82 				putchar(*p);
     83 			break;
     84 		}
     85 		case 'u'&037:
     86 		case 'w'&037:
     87 			lp = buf;
     88 			putchar('\n');
     89 			break;
     90 		default:
     91 			*lp++ = c;
     92 			putchar(c);
     93 		}
     94 	}
     95 }
     96