1/* $NetBSD: gets.c,v 1.17 2012/03/15 18:22:30 christos Exp $ */ 2 3/*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#include <sys/cdefs.h> 36#if defined(LIBC_SCCS) && !defined(lint) 37#if 0 38static char sccsid[] = "@(#)gets.c 8.1 (Berkeley) 6/4/93"; 39#else 40__RCSID("$NetBSD: gets.c,v 1.17 2012/03/15 18:22:30 christos Exp $"); 41#endif 42#endif /* LIBC_SCCS and not lint */ 43 44#include <assert.h> 45#include <errno.h> 46#include <stdio.h> 47#include "reentrant.h" 48#include "local.h" 49#ifdef _FORTIFY_SOURCE 50#undef gets 51#endif 52 53__warn_references(gets, "warning: this program uses gets(), which is unsafe.") 54 55char * 56__gets(char *buf) 57{ 58 int c; 59 char *s; 60 61 _DIAGASSERT(buf != NULL); 62 63 FLOCKFILE(stdin); 64 for (s = buf; (c = getchar_unlocked()) != '\n'; ) { 65 if (c == EOF) { 66 if (s == buf) { 67 FUNLOCKFILE(stdin); 68 return NULL; 69 } else { 70 break; 71 } 72 } else { 73 *s++ = c; 74 } 75 } 76 *s = 0; 77 FUNLOCKFILE(stdin); 78 return buf; 79} 80 81char * 82gets(char *buf) { 83 return __gets(buf); 84} 85