1 /* $NetBSD: tgets.c,v 1.4 2006/04/10 18:40:06 garbled 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 <lib/libsa/stand.h> 35 #include "boot.h" 36 37 int 38 tgets(char *buf) 39 { 40 register int c; 41 register char *lp; 42 43 #ifdef USE_SCAN 44 int i; 45 46 #define SCANWAIT 10000 47 #define PWAIT 500 48 for (i = 0; i < PWAIT; i++) { 49 if ((c = cnscan()) != -1) 50 goto next; 51 delay(SCANWAIT); 52 } 53 return (-1); 54 next: 55 #else 56 c = getchar(); 57 #endif 58 for (lp = buf;; c = getchar()) { 59 switch (c & 0177) { 60 case '\n': 61 case '\r': 62 *lp = '\0'; 63 putchar('\n'); 64 return 0; 65 case '\b': 66 case '\177': 67 if (lp > buf) { 68 lp--; 69 putchar('\b'); 70 putchar(' '); 71 putchar('\b'); 72 } 73 break; 74 case 'r'&037: { 75 register char *p; 76 77 putchar('\n'); 78 for (p = buf; p < lp; ++p) 79 putchar(*p); 80 break; 81 } 82 case 'u'&037: 83 case 'w'&037: 84 lp = buf; 85 putchar('\n'); 86 break; 87 default: 88 *lp++ = c; 89 putchar(c); 90 } 91 } 92 } 93