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gets.c revision 1.11 
      1 /*	$NetBSD: gets.c,v 1.11 2016/06/05 13:33:03 maxv 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 	int c;
     40 	char *lp;
     41 
     42 	for (lp = buf;;) {
     43 		switch (c = getchar() & 0177) {
     44 		case '\n':
     45 		case '\r':
     46 			*lp = '\0';
     47 			putchar('\n');
     48 			return;
     49 		case '\b':
     50 		case '\177':
     51 			if (lp > buf) {
     52 				lp--;
     53 				putchar('\b');
     54 				putchar(' ');
     55 				putchar('\b');
     56 			}
     57 			break;
     58 #if HASH_ERASE
     59 		case '#':
     60 			if (lp > buf)
     61 				--lp;
     62 			break;
     63 #endif
     64 		case 'r' & 037: {
     65 			char *p;
     66 
     67 			putchar('\n');
     68 			for (p = buf; p < lp; ++p)
     69 				putchar(*p);
     70 			break;
     71 		}
     72 #if AT_ERASE
     73 		case '@':
     74 #endif
     75 		case 'u' & 037:
     76 		case 'w' & 037:
     77 			lp = buf;
     78 			putchar('\n');
     79 			break;
     80 		default:
     81 			*lp++ = c;
     82 			putchar(c);
     83 			break;
     84 		}
     85 	}
     86 	/*NOTREACHED*/
     87 }
     88 
     89 void
     90 gets_s(char *buf, size_t size)
     91 {
     92 	int c;
     93 	char *lp;
     94 
     95 	for (lp = buf;;) {
     96 		if (lp - buf == size) {
     97 			lp--;
     98 			*lp = '\0';
     99 			return;
    100 		}
    101 		switch (c = getchar() & 0177) {
    102 		case '\n':
    103 		case '\r':
    104 			*lp = '\0';
    105 			putchar('\n');
    106 			return;
    107 		case '\b':
    108 		case '\177':
    109 			if (lp > buf) {
    110 				lp--;
    111 				putchar('\b');
    112 				putchar(' ');
    113 				putchar('\b');
    114 			}
    115 			break;
    116 #if HASH_ERASE
    117 		case '#':
    118 			if (lp > buf)
    119 				--lp;
    120 			break;
    121 #endif
    122 		case 'r' & 037: {
    123 			char *p;
    124 
    125 			putchar('\n');
    126 			for (p = buf; p < lp; ++p)
    127 				putchar(*p);
    128 			break;
    129 		}
    130 #if AT_ERASE
    131 		case '@':
    132 #endif
    133 		case 'u' & 037:
    134 		case 'w' & 037:
    135 			lp = buf;
    136 			putchar('\n');
    137 			break;
    138 		default:
    139 			*lp++ = c;
    140 			putchar(c);
    141 			break;
    142 		}
    143 	}
    144 	/*NOTREACHED*/
    145 }
    146