1 /* $NetBSD: gets.c,v 1.15 2019/03/31 20:08:45 christos 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 #if 0 /* harmful */ 37 void 38 gets(char *buf) 39 { 40 kgets(buf, (size_t)-1); 41 } 42 #endif 43 44 void 45 kgets(char *buf, size_t size) 46 { 47 int c; 48 char *lp; 49 50 for (lp = buf;;) { 51 if ((size_t)(lp - buf) == size) { 52 lp--; 53 *lp = '\0'; 54 return; 55 } 56 switch (c = getchar() & 0177) { 57 case '\n': 58 case '\r': 59 *lp = '\0'; 60 putchar('\n'); 61 return; 62 case '\b': 63 case '\177': 64 if (lp > buf) { 65 lp--; 66 putchar('\b'); 67 putchar(' '); 68 putchar('\b'); 69 } 70 break; 71 #if HASH_ERASE 72 case '#': 73 if (lp > buf) 74 --lp; 75 break; 76 #endif 77 case 'r' & 037: { 78 char *p; 79 80 putchar('\n'); 81 for (p = buf; p < lp; ++p) 82 putchar(*p); 83 break; 84 } 85 #if AT_ERASE 86 case '@': 87 #endif 88 case 'u' & 037: 89 case 'w' & 037: 90 lp = buf; 91 putchar('\n'); 92 break; 93 default: 94 *lp++ = c; 95 putchar(c); 96 break; 97 } 98 } 99 /*NOTREACHED*/ 100 } 101