1 /* $NetBSD: gets.c,v 1.6 1995/10/11 21:16:57 pk 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 32 #include <sys/cdefs.h> 33 #include "stand.h" 34 35 /* gets() with constrained input length, for passwords */ 36 37 void 38 pwgets(char *buf, int n, int hide) 39 { 40 int c; 41 char *lp; 42 43 for (lp = buf;;) 44 switch (c = getchar() & 0177) { 45 case '\n': 46 case '\r': 47 *lp = '\0'; 48 putchar('\n'); 49 return; 50 case '\b': 51 case '\177': 52 if (lp > buf) { 53 lp--; 54 if (hide == 0) { 55 putchar('\b'); 56 putchar(' '); 57 putchar('\b'); 58 } 59 } 60 break; 61 case 'u'&037: 62 case 'w'&037: 63 lp = buf; 64 putchar('\n'); 65 break; 66 default: 67 if ((n < 1) || ((lp - buf) < n - 1)) { 68 *lp++ = c; 69 if (hide == 0) { 70 putchar('*'); 71 } 72 } 73 } 74 /*NOTREACHED*/ 75 } 76