1N/A/***********************************************************************
1N/A* *
1N/A* This software is part of the ast package *
1N/A* Copyright (c) 1985-2011 AT&T Intellectual Property *
1N/A* and is licensed under the *
1N/A* Common Public License, Version 1.0 *
1N/A* by AT&T Intellectual Property *
1N/A* *
1N/A* A copy of the License is available at *
1N/A* http://www.opensource.org/licenses/cpl1.0.txt *
1N/A* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
1N/A* *
1N/A* Information and Software Systems Research *
1N/A* AT&T Research *
1N/A* Florham Park NJ *
1N/A* *
1N/A* Glenn Fowler <gsf@research.att.com> *
1N/A* David Korn <dgk@research.att.com> *
1N/A* Phong Vo <kpv@research.att.com> *
1N/A* *
1N/A***********************************************************************/
1N/A#include "sfhdr.h"
1N/A
1N/A/* Function to clear a locked stream.
1N/A** This is useful for programs that longjmp from the mid of an sfio function.
1N/A** There is no guarantee on data integrity in such a case.
1N/A**
1N/A** Written by Kiem-Phong Vo
1N/A*/
1N/A#if __STD_C
1N/Aint sfclrlock(Sfio_t* f)
1N/A#else
1N/Aint sfclrlock(f)
1N/ASfio_t *f;
1N/A#endif
1N/A{
1N/A int rv;
1N/A SFMTXDECL(f);
1N/A
1N/A /* already closed */
1N/A if(f && (f->mode&SF_AVAIL))
1N/A return 0;
1N/A
1N/A SFMTXENTER(f,0);
1N/A
1N/A /* clear error bits */
1N/A f->flags &= ~(SF_ERROR|SF_EOF);
1N/A
1N/A /* clear peek locks */
1N/A if(f->mode&SF_PKRD)
1N/A { f->here -= f->endb-f->next;
1N/A f->endb = f->next;
1N/A }
1N/A
1N/A SFCLRBITS(f);
1N/A
1N/A /* throw away all lock bits except for stacking state SF_PUSH */
1N/A f->mode &= (SF_RDWR|SF_INIT|SF_POOL|SF_PUSH|SF_SYNCED|SF_STDIO);
1N/A
1N/A rv = (f->mode&SF_PUSH) ? 0 : (f->flags&SF_FLAGS);
1N/A
1N/A SFMTXRETURN(f, rv);
1N/A}