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 * @(#)gets.c 8.1 (Berkeley) 6/11/93 32 */ 33 34 #include <sys/cdefs.h> 35 36 #include "stand.h" 37 38 /* gets() with constrained input length */ 39 40 void 41 ngets(char *buf, int n) 42 { 43 int c; 44 char *lp; 45 46 for (lp = buf; ; ) { 47 c = getchar(); 48 if (c == -1) 49 break; 50 switch (c & 0177) { 51 case '\n': 52 case '\r': 53 *lp = '\0'; 54 putchar('\n'); 55 return; 56 case '\b': 57 case '\177': 58 if (lp > buf) { 59 lp--; 60 putchar('\b'); 61 putchar(' '); 62 putchar('\b'); 63 } 64 break; 65 case 'r' & 037: { 66 char *p; 67 68 putchar('\n'); 69 for (p = buf; p < lp; ++p) 70 putchar(*p); 71 break; 72 } 73 case 'u' & 037: 74 case 'w' & 037: 75 lp = buf; 76 putchar('\n'); 77 break; 78 default: 79 if ((n < 1) || ((lp - buf) < n - 1)) { 80 *lp++ = c; 81 putchar(c); 82 } 83 } 84 } 85 /*NOTREACHED*/ 86 } 87 88 int 89 fgetstr(char *buf, int size, int fd) 90 { 91 char c; 92 int err, len; 93 94 size--; /* leave space for terminator */ 95 len = 0; 96 while (size != 0) { 97 err = read(fd, &c, sizeof (c)); 98 if (err < 0) /* read error */ 99 return (-1); 100 if (err == 0) { /* EOF */ 101 if (len == 0) 102 return (-1); /* nothing to read */ 103 break; 104 } 105 if ((c == '\r') || /* line terminators */ 106 (c == '\n')) 107 break; 108 *buf++ = c; /* keep char */ 109 size--; 110 len++; 111 } 112 *buf = 0; 113 return (len); 114 } 115