1 /* $NetBSD: gets.c,v 1.1 2001/06/14 12:57:14 fredette 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 /* 41 * This implementation assumes that getchar() does echo, because 42 * on some machines, it is hard to keep echo from being done. 43 * Those that need it can do echo in their getchar() function. 44 * 45 * Yes, the code below will echo CR, DEL, and other control chars, 46 * but sending CR or DEL here is harmless. All the other editing 47 * characters will be followed by a newline, so it doesn't matter. 48 * (Most terminals will not show them anyway.) 49 */ 50 51 void 52 gets(buf) 53 char *buf; 54 { 55 register int c; 56 register char *lp; 57 58 top: 59 lp = buf; 60 61 for (;;) { 62 c = getchar() & 0177; 63 64 #ifdef GETS_MUST_ECHO /* Preserved in case someone wants it... */ 65 putchar(c); 66 #endif 67 68 switch (c) { 69 70 default: 71 *lp++ = c; 72 continue; 73 74 case '\177': 75 putchar('\b'); 76 /* fall through */ 77 case '\b': 78 putchar(' '); 79 putchar('\b'); 80 /* fall through */ 81 case '#': 82 if (lp > buf) 83 lp--; 84 continue; 85 86 #ifdef GETS_REPRINT 87 /* 88 * This is not very useful in a boot program. 89 * (It costs you 52 bytes on m68k, gcc -O3). 90 */ 91 case 'r'&037: { 92 register char *p; 93 putchar('\n'); 94 for (p = buf; p < lp; ++p) 95 putchar(*p); 96 continue; 97 } 98 #endif 99 100 case '@': 101 case 'u'&037: 102 case 'w'&037: 103 putchar('\n'); 104 goto top; 105 106 case '\r': 107 putchar('\n'); 108 /* fall through */ 109 case '\n': 110 *lp = '\0'; 111 return; 112 113 } /* switch */ 114 } 115 /*NOTREACHED*/ 116 } 117