1 /* $NetBSD: tgets.c,v 1.4 2007/10/17 19:54:09 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 #define USE_SCAN 38 39 int 40 tgets(char *buf) 41 { 42 int c; 43 char *lp; 44 45 #ifdef USE_SCAN 46 int i; 47 48 #define SCANWAIT 10000 49 #define PWAIT 500 50 for (i = 0; i < PWAIT; i++) { 51 if ((c = cnscan()) != -1) 52 goto next; 53 delay(SCANWAIT / 32); /* XXX */ 54 } 55 return -1; 56 next: 57 #else 58 c = getchar(); 59 #endif 60 for (lp = buf;; c = getchar()) { 61 switch (c & 0177) { 62 case '\n': 63 case '\r': 64 *lp = '\0'; 65 putchar('\n'); 66 return 0; 67 case '\b': 68 case '\177': 69 if (lp > buf) { 70 lp--; 71 putchar('\b'); 72 putchar(' '); 73 putchar('\b'); 74 } 75 break; 76 case 'r' & 037: { 77 char *p; 78 79 putchar('\n'); 80 for (p = buf; p < lp; ++p) 81 putchar(*p); 82 break; 83 } 84 case 'u' & 037: 85 case 'w' & 037: 86 lp = buf; 87 putchar('\n'); 88 break; 89 default: 90 *lp++ = c; 91 putchar(c); 92 } 93 } 94 } 95