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 <sys/cdefs.h> 33 #include "stand.h" 34 35 /* gets() with constrained input length */ 36 37 void 38 ngets(char *buf, int n) 39 { 40 int c; 41 char *lp; 42 43 for (lp = buf;;) { 44 c = getchar(); 45 if (c == -1) 46 break; 47 switch (c & 0177) { 48 case '\n': 49 case '\r': 50 *lp = '\0'; 51 putchar('\n'); 52 return; 53 case '\b': 54 case '\177': 55 if (lp > buf) { 56 lp--; 57 putchar('\b'); 58 putchar(' '); 59 putchar('\b'); 60 } 61 break; 62 case 'r'&037: { 63 char *p; 64 65 putchar('\n'); 66 for (p = buf; p < lp; ++p) 67 putchar(*p); 68 break; 69 } 70 case 'u'&037: 71 case 'w'&037: 72 lp = buf; 73 putchar('\n'); 74 break; 75 default: 76 if ((n < 1) || ((lp - buf) < n - 1)) { 77 *lp++ = c; 78 putchar(c); 79 } 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