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 #include "namespace.h" 36 #include <unistd.h> 37 #include <stdio.h> 38 #include "un-namespace.h" 39 #include "libc_private.h" 40 #include "local.h" 41 42 char * 43 __gets_unsafe(char *buf) 44 { 45 int c; 46 char *s, *ret; 47 static int warned; 48 static const char w[] = 49 "warning: this program uses gets(), which is unsafe.\n"; 50 51 FLOCKFILE_CANCELSAFE(stdin); 52 ORIENT(stdin, -1); 53 if (!warned) { 54 (void) _write(STDERR_FILENO, w, sizeof(w) - 1); 55 warned = 1; 56 } 57 for (s = buf; (c = __sgetc(stdin)) != '\n'; ) { 58 if (c == EOF) { 59 if (s == buf) { 60 ret = NULL; 61 goto end; 62 } else 63 break; 64 } else 65 *s++ = c; 66 } 67 *s = 0; 68 ret = buf; 69 end: 70 FUNLOCKFILE_CANCELSAFE(); 71 return (ret); 72 } 73 __sym_compat(gets, __gets_unsafe, FBSD_1.0); 74