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