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 switch (c = getchar() & 0177) { 49 case '\n': 50 case '\r': 51 *lp = '\0'; 52 putchar('\n'); 53 return; 54 case '\b': 55 case '\177': 56 if (lp > buf) { 57 lp--; 58 putchar('\b'); 59 putchar(' '); 60 putchar('\b'); 61 } 62 break; 63 case 'r'&037: { 64 char *p; 65 66 putchar('\n'); 67 for (p = buf; p < lp; ++p) 68 putchar(*p); 69 break; 70 } 71 case 'u'&037: 72 case 'w'&037: 73 lp = buf; 74 putchar('\n'); 75 break; 76 default: 77 if ((n < 1) || ((lp - buf) < n - 1)) { 78 *lp++ = c; 79 putchar(c); 80 } 81 } 82 /*NOTREACHED*/ 83 } 84 85 int 86 fgetstr(char *buf, int size, int fd) 87 { 88 char c; 89 int err, len; 90 91 size--; /* leave space for terminator */ 92 len = 0; 93 while (size != 0) { 94 err = read(fd, &c, sizeof(c)); 95 if (err < 0) /* read error */ 96 return(-1); 97 if (err == 0) { /* EOF */ 98 if (len == 0) 99 return(-1); /* nothing to read */ 100 break; 101 } 102 if ((c == '\r') || /* line terminators */ 103 (c == '\n')) 104 break; 105 *buf++ = c; /* keep char */ 106 size--; 107 len++; 108 } 109 *buf = 0; 110 return(len); 111 } 112 113