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 __FBSDID("$FreeBSD$"); 36 37 #include "stand.h" 38 39 /* gets() with constrained input length */ 40 41 void 42 ngets(char *buf, int n) 43 { 44 int c; 45 char *lp; 46 47 for (lp = buf;;) { 48 c = getchar(); 49 if (c == -1) 50 break; 51 switch (c & 0177) { 52 case '\n': 53 case '\r': 54 *lp = '\0'; 55 putchar('\n'); 56 return; 57 case '\b': 58 case '\177': 59 if (lp > buf) { 60 lp--; 61 putchar('\b'); 62 putchar(' '); 63 putchar('\b'); 64 } 65 break; 66 case 'r'&037: { 67 char *p; 68 69 putchar('\n'); 70 for (p = buf; p < lp; ++p) 71 putchar(*p); 72 break; 73 } 74 case 'u'&037: 75 case 'w'&037: 76 lp = buf; 77 putchar('\n'); 78 break; 79 default: 80 if ((n < 1) || ((lp - buf) < n - 1)) { 81 *lp++ = c; 82 putchar(c); 83 } 84 } 85 } 86 /*NOTREACHED*/ 87 } 88 89 int 90 fgetstr(char *buf, int size, int fd) 91 { 92 char c; 93 int err, len; 94 95 size--; /* leave space for terminator */ 96 len = 0; 97 while (size != 0) { 98 err = read(fd, &c, sizeof(c)); 99 if (err < 0) /* read error */ 100 return(-1); 101 if (err == 0) { /* EOF */ 102 if (len == 0) 103 return(-1); /* nothing to read */ 104 break; 105 } 106 if ((c == '\r') || /* line terminators */ 107 (c == '\n')) 108 break; 109 *buf++ = c; /* keep char */ 110 size--; 111 len++; 112 } 113 *buf = 0; 114 return(len); 115 } 116 117