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sfsize.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2006 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                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"

/*    Get the size of a stream.
**
**    Written by Kiem-Phong Vo.
*/
#if __STD_C
Sfoff_t sfsize(reg Sfio_t* f)
#else
Sfoff_t sfsize(f)
reg Sfio_t* f;
#endif
{
      Sfdisc_t*   disc;
      reg int           mode;
      Sfoff_t           s;

      SFMTXSTART(f, (Sfoff_t)(-1));

      if((mode = f->mode&SF_RDWR) != (int)f->mode && _sfmode(f,mode,0) < 0)
            SFMTXRETURN(f, (Sfoff_t)(-1));

      if(f->flags&SF_STRING)
      {     SFSTRSIZE(f);
            SFMTXRETURN(f, f->extent);
      }

      SFLOCK(f,0);

      s = f->here;

      if(f->extent >= 0)
      {     if(f->flags&(SF_SHARE|SF_APPENDWR))
            {     for(disc = f->disc; disc; disc = disc->disc)
                        if(disc->seekf)
                              break;
                  if(!_sys_stat || disc)
                  {     Sfoff_t     e;
                        if((e = SFSK(f,0,SEEK_END,disc)) >= 0)
                              f->extent = e;
                        if(SFSK(f,f->here,SEEK_SET,disc) != f->here)
                              f->here = SFSK(f,(Sfoff_t)0,SEEK_CUR,disc);
                  }
#if _sys_stat
                  else
                  {     sfstat_t    st;
                        if(sysfstatf(f->file,&st) < 0)
                              f->extent = -1;
                        else if((f->extent = st.st_size) < f->here)
                              f->here = SFSK(f,(Sfoff_t)0,SEEK_CUR,disc);
                  }
#endif
            }

            if((f->flags&(SF_SHARE|SF_PUBLIC)) == (SF_SHARE|SF_PUBLIC))
                  f->here = SFSK(f,(Sfoff_t)0,SEEK_CUR,f->disc);
      }

      if(f->here != s && (f->mode&SF_READ) )
      {     /* buffered data is known to be invalid */
#ifdef MAP_TYPE
            if((f->bits&SF_MMAP) && f->data)
            {     SFMUNMAP(f,f->data,f->endb-f->data);
                  f->data = NIL(uchar*);
            }
#endif
            f->next = f->endb = f->endr = f->endw = f->data;
      }

      if(f->here < 0)
            f->extent = -1;
      else if(f->extent < f->here)
            f->extent = f->here;

      if((s = f->extent) >= 0)
      {     if(f->flags&SF_APPENDWR)
                  s += (f->next - f->data);
            else if(f->mode&SF_WRITE)
            {     s = f->here + (f->next - f->data);
                  if(s < f->extent)
                        s = f->extent;
            }
      }

      SFOPEN(f,0);
      SFMTXRETURN(f, s);
}

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