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gets.c revision 1.10.82.1 
      1 /*	$NetBSD: gets.c,v 1.10.82.1 2016/07/09 20:25:20 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 
     36 void
     37 gets(char *buf)
     38 {
     39 	kgets(buf, (size_t)-1);
     40 }
     41 
     42 void
     43 kgets(char *buf, size_t size)
     44 {
     45 	int c;
     46 	char *lp;
     47 
     48 	for (lp = buf;;) {
     49 		if (lp - buf == size) {
     50 			lp--;
     51 			*lp = '\0';
     52 			return;
     53 		}
     54 		switch (c = getchar() & 0177) {
     55 		case '\n':
     56 		case '\r':
     57 			*lp = '\0';
     58 			putchar('\n');
     59 			return;
     60 		case '\b':
     61 		case '\177':
     62 			if (lp > buf) {
     63 				lp--;
     64 				putchar('\b');
     65 				putchar(' ');
     66 				putchar('\b');
     67 			}
     68 			break;
     69 #if HASH_ERASE
     70 		case '#':
     71 			if (lp > buf)
     72 				--lp;
     73 			break;
     74 #endif
     75 		case 'r' & 037: {
     76 			char *p;
     77 
     78 			putchar('\n');
     79 			for (p = buf; p < lp; ++p)
     80 				putchar(*p);
     81 			break;
     82 		}
     83 #if AT_ERASE
     84 		case '@':
     85 #endif
     86 		case 'u' & 037:
     87 		case 'w' & 037:
     88 			lp = buf;
     89 			putchar('\n');
     90 			break;
     91 		default:
     92 			*lp++ = c;
     93 			putchar(c);
     94 			break;
     95 		}
     96 	}
     97 	/*NOTREACHED*/
     98 }
     99