1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * 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 37 #if defined(LIBC_SCCS) && !defined(lint) 38 /*static char *sccsid = "from: @(#)gets.c 5.3 (Berkeley) 1/20/91";*/ 39 static char *rcsid = "$Id: gets.c,v 1.5 1994/04/24 01:05:13 mycroft Exp $"; 40 #endif /* LIBC_SCCS and not lint */ 41 42 #include <unistd.h> 43 #include <stdio.h> 44 #include <sys/uio.h> 45 46 char * 47 gets(buf) 48 char *buf; 49 { 50 register int c; 51 register char *s; 52 static int warned; 53 static char w[] = 54 ": warning: this program uses gets(), which is unsafe.\r\n"; 55 56 if (!warned) { 57 struct iovec iov[2]; 58 extern char *__progname; /* in crt0 */ 59 60 iov[0].iov_base = __progname; 61 iov[0].iov_len = strlen(__progname); 62 iov[1].iov_base = w; 63 iov[1].iov_len = sizeof(w) - 1; 64 (void) writev(STDERR_FILENO, iov, 2); 65 warned = 1; 66 } 67 68 for (s = buf; (c = getchar()) != '\n';) 69 if (c == EOF) 70 if (s == buf) 71 return (NULL); 72 else 73 break; 74 else 75 *s++ = c; 76 *s = 0; 77 return (buf); 78 } 79