1 /* $NetBSD: gets.c,v 1.2 2009/07/20 04:59:03 kiyohara 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 "lib/libsa/stand.h" 41 #include "lib/libsa/loadfile.h" 42 43 #include "bootstrap.h" 44 45 /* gets() with constrained input length */ 46 47 void 48 ngets(char *buf, int n) 49 { 50 int c; 51 char *lp; 52 53 for (lp = buf;;) 54 switch (c = getchar() & 0177) { 55 case '\n': 56 case '\r': 57 *lp = '\0'; 58 putchar('\n'); 59 return; 60 case '\b': 61 case '\177': 62 if (lp > buf) { 63 lp--; 64 putchar('\b'); 65 putchar(' '); 66 putchar('\b'); 67 } 68 break; 69 case 'r'&037: { 70 char *p; 71 72 putchar('\n'); 73 for (p = buf; p < lp; ++p) 74 putchar(*p); 75 break; 76 } 77 case 'u'&037: 78 case 'w'&037: 79 lp = buf; 80 putchar('\n'); 81 break; 82 default: 83 if ((n < 1) || ((lp - buf) < n)) { 84 *lp++ = c; 85 putchar(c); 86 } 87 } 88 /*NOTREACHED*/ 89 } 90 91 int 92 fgetstr(char *buf, int size, int fd) 93 { 94 char c; 95 int err, len; 96 97 size--; /* leave space for terminator */ 98 len = 0; 99 while (size != 0) { 100 err = read(fd, &c, sizeof(c)); 101 if (err < 0) /* read error */ 102 return(-1); 103 if (err == 0) { /* EOF */ 104 if (len == 0) 105 return(-1); /* nothing to read */ 106 break; 107 } 108 if ((c == '\r') || /* line terminators */ 109 (c == '\n')) 110 break; 111 *buf++ = c; /* keep char */ 112 size--; 113 len++; 114 } 115 *buf = 0; 116 return(len); 117 } 118