1 /* $NetBSD: tgets.c,v 1.6 2005/12/11 12:17:04 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 <lib/libsa/stand.h> 35 #include "boot.h" 36 37 int 38 tgets(buf) 39 char *buf; 40 { 41 register int c; 42 register char *lp; 43 44 #ifdef USE_SCAN 45 int i; 46 47 #define SCANWAIT 10000 48 #define PWAIT 500 49 for (i = 0; i < PWAIT; i++) { 50 if ((c = cnscan()) != -1) 51 goto next; 52 delay(SCANWAIT); 53 } 54 return (-1); 55 next: 56 #else 57 c = getchar(); 58 #endif 59 for (lp = buf;; c = getchar()) { 60 switch (c & 0177) { 61 case '\n': 62 case '\r': 63 *lp = '\0'; 64 putchar('\n'); 65 return 0; 66 case '\b': 67 case '\177': 68 if (lp > buf) { 69 lp--; 70 putchar('\b'); 71 putchar(' '); 72 putchar('\b'); 73 } 74 break; 75 case 'r'&037: { 76 register char *p; 77 78 putchar('\n'); 79 for (p = buf; p < lp; ++p) 80 putchar(*p); 81 break; 82 } 83 case 'u'&037: 84 case 'w'&037: 85 lp = buf; 86 putchar('\n'); 87 break; 88 default: 89 *lp++ = c; 90 putchar(c); 91 } 92 } 93 } 94