1 /* $OpenBSD: getsn.c,v 1.7 2018/04/25 11:15:58 dlg Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Theo de Raadt 5 * 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/types.h> 29 #include <sys/systm.h> 30 #include <dev/cons.h> 31 32 size_t 33 getsn(char *cp, size_t size) 34 { 35 size_t len = 0; 36 int c; 37 char *lp = cp; 38 39 while (1) { 40 c = cngetc(); 41 switch (c) { 42 case '\n': 43 case '\r': 44 printf("\n"); 45 *lp++ = '\0'; 46 return (len); 47 case '\b': 48 case '\177': 49 if (len) { 50 printf("\b \b"); 51 --lp; 52 --len; 53 } 54 break; 55 case 'u' & 037: 56 while (len) { 57 printf("\b \b"); 58 --lp; 59 --len; 60 } 61 break; 62 case '\t': 63 c = ' '; 64 default: 65 if (len + 1 >= size || c < ' ') { 66 printf("\007"); 67 break; 68 } 69 printf("%c", c); 70 ++len; 71 *lp++ = c; 72 } 73 } 74 } 75