1 /* $NetBSD: gets.c,v 1.4 2005/12/11 12:19:29 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 /* 37 * This implementation assumes that getchar() does echo, because 38 * on some machines, it is hard to keep echo from being done. 39 * Those that need it can do echo in their getchar() function. 40 * 41 * Yes, the code below will echo CR, DEL, and other control chars, 42 * but sending CR or DEL here is harmless. All the other editing 43 * characters will be followed by a newline, so it doesn't matter. 44 * (Most terminals will not show them anyway.) 45 */ 46 47 void 48 gets(char *buf) 49 { 50 int c; 51 char *lp; 52 53 top: 54 lp = buf; 55 56 for (;;) { 57 c = getchar() & 0177; 58 59 #ifdef GETS_MUST_ECHO /* Preserved in case someone wants it... */ 60 putchar(c); 61 #endif 62 63 switch (c) { 64 65 default: 66 *lp++ = c; 67 continue; 68 69 case '\177': 70 putchar('\b'); 71 /* fall through */ 72 case '\b': 73 putchar(' '); 74 putchar('\b'); 75 /* fall through */ 76 case '#': 77 if (lp > buf) 78 lp--; 79 continue; 80 81 #ifdef GETS_REPRINT 82 /* 83 * This is not very useful in a boot program. 84 * (It costs you 52 bytes on m68k, gcc -O3). 85 */ 86 case 'r'&037: { 87 char *p; 88 89 putchar('\n'); 90 for (p = buf; p < lp; ++p) 91 putchar(*p); 92 continue; 93 } 94 #endif 95 96 case '@': 97 case 'u'&037: 98 case 'w'&037: 99 putchar('\n'); 100 goto top; 101 102 case '\r': 103 putchar('\n'); 104 /* fall through */ 105 case '\n': 106 *lp = '\0'; 107 return; 108 109 } /* switch */ 110 } 111 /*NOTREACHED*/ 112 } 113