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