1 /* $NetBSD: gets.c,v 1.1 2006/04/07 14:21:29 cherry 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)gets.c 8.1 (Berkeley) 6/11/93 36 */ 37 38 #include <sys/cdefs.h> 39 40 #include "bootstrap.h" 41 42 /* gets() with constrained input length */ 43 44 void 45 ngets(char *buf, int n) 46 { 47 int c; 48 char *lp; 49 50 for (lp = buf;;) 51 switch (c = getchar() & 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)) { 81 *lp++ = c; 82 putchar(c); 83 } 84 } 85 /*NOTREACHED*/ 86 } 87 88 int 89 fgetstr(char *buf, int size, int fd) 90 { 91 char c; 92 int err, len; 93 94 size--; /* leave space for terminator */ 95 len = 0; 96 while (size != 0) { 97 err = read(fd, &c, sizeof(c)); 98 if (err < 0) /* read error */ 99 return(-1); 100 if (err == 0) { /* EOF */ 101 if (len == 0) 102 return(-1); /* nothing to read */ 103 break; 104 } 105 if ((c == '\r') || /* line terminators */ 106 (c == '\n')) 107 break; 108 *buf++ = c; /* keep char */ 109 size--; 110 len++; 111 } 112 *buf = 0; 113 return(len); 114 } 115