1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 #if defined(LIBC_SCCS) && !defined(lint) 36 static char sccsid[] = "@(#)gets.c 8.1 (Berkeley) 6/4/93"; 37 #endif /* LIBC_SCCS and not lint */ 38 #include <sys/cdefs.h> 39 #include "namespace.h" 40 #include <unistd.h> 41 #include <stdio.h> 42 #include "un-namespace.h" 43 #include "libc_private.h" 44 #include "local.h" 45 46 char * 47 __gets_unsafe(char *buf) 48 { 49 int c; 50 char *s, *ret; 51 static int warned; 52 static const char w[] = 53 "warning: this program uses gets(), which is unsafe.\n"; 54 55 FLOCKFILE_CANCELSAFE(stdin); 56 ORIENT(stdin, -1); 57 if (!warned) { 58 (void) _write(STDERR_FILENO, w, sizeof(w) - 1); 59 warned = 1; 60 } 61 for (s = buf; (c = __sgetc(stdin)) != '\n'; ) { 62 if (c == EOF) { 63 if (s == buf) { 64 ret = NULL; 65 goto end; 66 } else 67 break; 68 } else 69 *s++ = c; 70 } 71 *s = 0; 72 ret = buf; 73 end: 74 FUNLOCKFILE_CANCELSAFE(); 75 return (ret); 76 } 77 __sym_compat(gets, __gets_unsafe, FBSD_1.0); 78