1255253Ssjg/* $NetBSD: gets.c,v 1.6 1995/10/11 21:16:57 pk Exp $ */ 2236769Sobrien 3236769Sobrien/*- 4236769Sobrien * Copyright (c) 1993 5236769Sobrien * The Regents of the University of California. All rights reserved. 6236769Sobrien * 7236769Sobrien * Redistribution and use in source and binary forms, with or without 8236769Sobrien * modification, are permitted provided that the following conditions 9236769Sobrien * are met: 10236769Sobrien * 1. Redistributions of source code must retain the above copyright 11236769Sobrien * notice, this list of conditions and the following disclaimer. 12236769Sobrien * 2. Redistributions in binary form must reproduce the above copyright 13236769Sobrien * notice, this list of conditions and the following disclaimer in the 14236769Sobrien * documentation and/or other materials provided with the distribution. 15236769Sobrien * 4. Neither the name of the University nor the names of its contributors 16236769Sobrien * may be used to endorse or promote products derived from this software 17236769Sobrien * without specific prior written permission. 18236769Sobrien * 19236769Sobrien * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20236769Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21236769Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22236769Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23236769Sobrien * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24236769Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25236769Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26236769Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27236769Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28236769Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29236769Sobrien * SUCH DAMAGE. 30236769Sobrien * 31236769Sobrien * @(#)gets.c 8.1 (Berkeley) 6/11/93 32236769Sobrien */ 33236769Sobrien 34236769Sobrien#include <sys/cdefs.h> 35236769Sobrien__FBSDID("$FreeBSD$"); 36236769Sobrien 37236769Sobrien#include "stand.h" 38236769Sobrien 39236769Sobrien/* gets() with constrained input length */ 40236769Sobrien 41236769Sobrienvoid 42236769Sobrienngets(char *buf, int n) 43236769Sobrien{ 44236769Sobrien int c; 45236769Sobrien char *lp; 46236769Sobrien 47236769Sobrien for (lp = buf;;) 48236769Sobrien switch (c = getchar() & 0177) { 49236769Sobrien case '\n': 50236769Sobrien case '\r': 51236769Sobrien *lp = '\0'; 52236769Sobrien putchar('\n'); 53236769Sobrien return; 54236769Sobrien case '\b': 55236769Sobrien case '\177': 56236769Sobrien if (lp > buf) { 57236769Sobrien lp--; 58236769Sobrien putchar('\b'); 59236769Sobrien putchar(' '); 60236769Sobrien putchar('\b'); 61236769Sobrien } 62236769Sobrien break; 63236769Sobrien case 'r'&037: { 64236769Sobrien char *p; 65236769Sobrien 66236769Sobrien putchar('\n'); 67236769Sobrien for (p = buf; p < lp; ++p) 68236769Sobrien putchar(*p); 69236769Sobrien break; 70236769Sobrien } 71236769Sobrien case 'u'&037: 72236769Sobrien case 'w'&037: 73236769Sobrien lp = buf; 74236769Sobrien putchar('\n'); 75236769Sobrien break; 76236769Sobrien default: 77236769Sobrien if ((n < 1) || ((lp - buf) < n - 1)) { 78236769Sobrien *lp++ = c; 79236769Sobrien putchar(c); 80236769Sobrien } 81236769Sobrien } 82236769Sobrien /*NOTREACHED*/ 83236769Sobrien} 84236769Sobrien 85236769Sobrienint 86236769Sobrienfgetstr(char *buf, int size, int fd) 87236769Sobrien{ 88236769Sobrien char c; 89236769Sobrien int err, len; 90236769Sobrien 91236769Sobrien size--; /* leave space for terminator */ 92236769Sobrien len = 0; 93236769Sobrien while (size != 0) { 94236769Sobrien err = read(fd, &c, sizeof(c)); 95236769Sobrien if (err < 0) /* read error */ 96236769Sobrien return(-1); 97236769Sobrien if (err == 0) { /* EOF */ 98236769Sobrien if (len == 0) 99236769Sobrien return(-1); /* nothing to read */ 100236769Sobrien break; 101236769Sobrien } 102237578Sobrien if ((c == '\r') || /* line terminators */ 103236769Sobrien (c == '\n')) 104236769Sobrien break; 105236769Sobrien *buf++ = c; /* keep char */ 106249033Ssjg size--; 107236769Sobrien len++; 108236769Sobrien } 109237578Sobrien *buf = 0; 110237578Sobrien return(len); 111236769Sobrien} 112237578Sobrien 113236769Sobrien