11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/*- 21dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Copyright (c) 1990, 1993 31dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * The Regents of the University of California. All rights reserved. 41dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 51dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * This code is derived from software contributed to Berkeley by 61dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Chris Torek. 71dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 81dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Redistribution and use in source and binary forms, with or without 91dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * modification, are permitted provided that the following conditions 101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * are met: 111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 1. Redistributions of source code must retain the above copyright 121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer. 131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer in the 151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * documentation and/or other materials provided with the distribution. 16b2e1abda0503874a5bb097e0b55ad4f8ce211a8dElliott Hughes * 3. Neither the name of the University nor the names of its contributors 171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * may be used to endorse or promote products derived from this software 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * without specific prior written permission. 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * SUCH DAMAGE. 311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 336b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes#if defined(LIBC_SCCS) && !defined(lint) 346b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughesstatic char sccsid[] = "@(#)fpurge.c 8.1 (Berkeley) 6/4/93"; 356b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes#endif /* LIBC_SCCS and not lint */ 366b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes#include <sys/cdefs.h> 376b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes__FBSDID("$FreeBSD$"); 386b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes 396b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes#include "namespace.h" 401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <errno.h> 411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdio.h> 421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdlib.h> 436b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes#include "un-namespace.h" 441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "local.h" 456b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes#include "libc_private.h" 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * fpurge: like fflush, but without writing anything: leave the 491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * given FILE's buffer empty. 501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectint 52b2e1abda0503874a5bb097e0b55ad4f8ce211a8dElliott Hughesfpurge(FILE *fp) 531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 546b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes int retval; 55f582340a6a48588aa50da17e1620e8f91b146941Kenny Root FLOCKFILE(fp); 561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (!fp->_flags) { 571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project errno = EBADF; 586b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes retval = EOF; 596b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes } else { 606b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes if (HASUB(fp)) 616b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes FREEUB(fp); 626b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes fp->_p = fp->_bf._base; 636b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes fp->_r = 0; 646b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes fp->_w = fp->_flags & (__SLBF|__SNBF|__SRD) ? 0 : fp->_bf._size; 656b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes retval = 0; 661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 67f582340a6a48588aa50da17e1620e8f91b146941Kenny Root FUNLOCKFILE(fp); 686b05c8e28017518fae04a3a601d0d245916561d2Elliott Hughes return (retval); 691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 70