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/* Get the size of a stream.
1N/A**
1N/A** Written by Kiem-Phong Vo.
1N/A*/
1N/A#if __STD_C
1N/ASfoff_t sfsize(Sfio_t* f)
1N/A#else
1N/ASfoff_t sfsize(f)
1N/ASfio_t* f;
1N/A#endif
1N/A{
1N/A Sfdisc_t* disc;
1N/A reg int mode;
1N/A Sfoff_t s;
1N/A SFMTXDECL(f);
1N/A
1N/A SFMTXENTER(f, (Sfoff_t)(-1));
1N/A
1N/A if((mode = f->mode&SF_RDWR) != (int)f->mode && _sfmode(f,mode,0) < 0)
1N/A SFMTXRETURN(f, (Sfoff_t)(-1));
1N/A
1N/A if(f->flags&SF_STRING)
1N/A { SFSTRSIZE(f);
1N/A SFMTXRETURN(f, f->extent);
1N/A }
1N/A
1N/A SFLOCK(f,0);
1N/A
1N/A s = f->here;
1N/A
1N/A if(f->extent >= 0)
1N/A { if(f->flags&(SF_SHARE|SF_APPENDWR))
1N/A { for(disc = f->disc; disc; disc = disc->disc)
1N/A if(disc->seekf)
1N/A break;
1N/A if(!_sys_stat || disc)
1N/A { Sfoff_t e;
1N/A if((e = SFSK(f,0,SEEK_END,disc)) >= 0)
1N/A f->extent = e;
1N/A if(SFSK(f,f->here,SEEK_SET,disc) != f->here)
1N/A f->here = SFSK(f,(Sfoff_t)0,SEEK_CUR,disc);
1N/A }
1N/A#if _sys_stat
1N/A else
1N/A { sfstat_t st;
1N/A if(sysfstatf(f->file,&st) < 0)
1N/A f->extent = -1;
1N/A else if((f->extent = st.st_size) < f->here)
1N/A f->here = SFSK(f,(Sfoff_t)0,SEEK_CUR,disc);
1N/A }
1N/A#endif
1N/A }
1N/A
1N/A if((f->flags&(SF_SHARE|SF_PUBLIC)) == (SF_SHARE|SF_PUBLIC))
1N/A f->here = SFSK(f,(Sfoff_t)0,SEEK_CUR,f->disc);
1N/A }
1N/A
1N/A if(f->here != s && (f->mode&SF_READ) )
1N/A { /* buffered data is known to be invalid */
1N/A#ifdef MAP_TYPE
1N/A if((f->bits&SF_MMAP) && f->data)
1N/A { SFMUNMAP(f,f->data,f->endb-f->data);
1N/A f->data = NIL(uchar*);
1N/A }
1N/A#endif
1N/A f->next = f->endb = f->endr = f->endw = f->data;
1N/A }
1N/A
1N/A if(f->here < 0)
1N/A f->extent = -1;
1N/A else if(f->extent < f->here)
1N/A f->extent = f->here;
1N/A
1N/A if((s = f->extent) >= 0)
1N/A { if(f->flags&SF_APPENDWR)
1N/A s += (f->next - f->data);
1N/A else if(f->mode&SF_WRITE)
1N/A { s = f->here + (f->next - f->data);
1N/A if(s < f->extent)
1N/A s = f->extent;
1N/A }
1N/A }
1N/A
1N/A SFOPEN(f,0);
1N/A SFMTXRETURN(f, s);
1N/A}