gets.c revision 110127
1184610Salfred/*- 2184610Salfred * Copyright (c) 1990, 1993 3184610Salfred * The Regents of the University of California. All rights reserved. 4184610Salfred * 5184610Salfred * This code is derived from software contributed to Berkeley by 6184610Salfred * Chris Torek. 7184610Salfred * 8184610Salfred * Redistribution and use in source and binary forms, with or without 9184610Salfred * modification, are permitted provided that the following conditions 10184610Salfred * are met: 11184610Salfred * 1. Redistributions of source code must retain the above copyright 12184610Salfred * notice, this list of conditions and the following disclaimer. 13184610Salfred * 2. Redistributions in binary form must reproduce the above copyright 14184610Salfred * notice, this list of conditions and the following disclaimer in the 15184610Salfred * documentation and/or other materials provided with the distribution. 16184610Salfred * 3. All advertising materials mentioning features or use of this software 17184610Salfred * must display the following acknowledgement: 18184610Salfred * This product includes software developed by the University of 19184610Salfred * California, Berkeley and its contributors. 20184610Salfred * 4. Neither the name of the University nor the names of its contributors 21184610Salfred * may be used to endorse or promote products derived from this software 22184610Salfred * without specific prior written permission. 23184610Salfred * 24184610Salfred * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25184610Salfred * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26184610Salfred * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27190754Sthompsa * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28184610Salfred * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29188942Sthompsa * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30188942Sthompsa * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31188942Sthompsa * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32188942Sthompsa * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33188942Sthompsa * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34184610Salfred * SUCH DAMAGE. 35184610Salfred */ 36184610Salfred 37188942Sthompsa#if defined(LIBC_SCCS) && !defined(lint) 38188942Sthompsastatic char sccsid[] = "@(#)gets.c 8.1 (Berkeley) 6/4/93"; 39188942Sthompsa#endif /* LIBC_SCCS and not lint */ 40188942Sthompsa#include <sys/cdefs.h> 41188942Sthompsa__FBSDID("$FreeBSD: head/lib/libc/stdio/gets.c 110127 2003-01-30 23:32:53Z tjr $"); 42188942Sthompsa 43188942Sthompsa#include "namespace.h" 44188942Sthompsa#include <unistd.h> 45188942Sthompsa#include <stdio.h> 46184610Salfred#include <sys/cdefs.h> 47188942Sthompsa#include "un-namespace.h" 48188942Sthompsa#include "libc_private.h" 49184610Salfred#include "local.h" 50184610Salfred 51184610Salfred__warn_references(gets, "warning: this program uses gets(), which is unsafe."); 52184610Salfred 53184610Salfredchar * 54184610Salfredgets(buf) 55184610Salfred char *buf; 56192502Sthompsa{ 57184610Salfred int c; 58192502Sthompsa char *s; 59184610Salfred static int warned; 60192502Sthompsa static char w[] = 61184610Salfred "warning: this program uses gets(), which is unsafe.\n"; 62184610Salfred 63184610Salfred FLOCKFILE(stdin); 64184610Salfred ORIENT(stdin, -1); 65184610Salfred if (!warned) { 66184610Salfred (void) _write(STDERR_FILENO, w, sizeof(w) - 1); 67184610Salfred warned = 1; 68184610Salfred } 69184610Salfred for (s = buf; (c = __sgetc(stdin)) != '\n';) 70184610Salfred if (c == EOF) 71192984Sthompsa if (s == buf) { 72184610Salfred FUNLOCKFILE(stdin); 73184610Salfred return (NULL); 74184610Salfred } else 75184610Salfred break; 76184610Salfred else 77184610Salfred *s++ = c; 78184610Salfred *s = 0; 79184610Salfred FUNLOCKFILE(stdin); 80184610Salfred return (buf); 81184610Salfred} 82187173Sthompsa