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sfclrlock.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2008 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#include    "sfhdr.h"

/*    Function to clear a locked stream.
**    This is useful for programs that longjmp from the mid of an sfio function.
**    There is no guarantee on data integrity in such a case.
**
**    Written by Kiem-Phong Vo
*/
#if __STD_C
int sfclrlock(reg Sfio_t* f)
#else
int sfclrlock(f)
reg Sfio_t  *f;
#endif
{
      int   rv;

      /* already closed */
      if(f && (f->mode&SF_AVAIL))
            return 0;

      SFMTXSTART(f,0);

      /* clear error bits */
      f->flags &= ~(SF_ERROR|SF_EOF);

      /* clear peek locks */
      if(f->mode&SF_PKRD)
      {     f->here -= f->endb-f->next;
            f->endb = f->next;
      }

      SFCLRBITS(f);

      /* throw away all lock bits except for stacking state SF_PUSH */
      f->mode &= (SF_RDWR|SF_INIT|SF_POOL|SF_PUSH|SF_SYNCED|SF_STDIO);

      rv = (f->mode&SF_PUSH) ? 0 : (f->flags&SF_FLAGS);

      SFMTXRETURN(f, rv);
}

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