1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)gets.c 8.1 (Berkeley) 6/4/93 37 * $FreeBSD: src/lib/libc/stdio/gets.c,v 1.9 2000/01/27 23:06:45 jasone Exp $ 38 * $DragonFly: src/lib/libc/stdio/gets.c,v 1.6 2005/11/20 11:07:30 swildner Exp $ 39 */ 40 41 #include "namespace.h" 42 #include <unistd.h> 43 #include <stdio.h> 44 #include <sys/cdefs.h> 45 #include "un-namespace.h" 46 47 __warn_references(gets, "warning: this program uses gets(), which is unsafe."); 48 49 char * 50 gets(char *buf) 51 { 52 int c; 53 char *s; 54 static int warned; 55 static char w[] = 56 "warning: this program uses gets(), which is unsafe.\n"; 57 58 if (!warned) { 59 _write(STDERR_FILENO, w, sizeof(w) - 1); 60 warned = 1; 61 } 62 for (s = buf; (c = getchar()) != '\n';) 63 if (c == EOF) 64 if (s == buf) 65 return (NULL); 66 else 67 break; 68 else 69 *s++ = c; 70 *s = 0; 71 return (buf); 72 } 73