#include "sfhdr.h"
#if __STD_C
int sfset(reg Sfio_t* f, reg int flags, reg int set)
#else
int sfset(f,flags,set)
reg Sfio_t* f;
reg int flags;
reg int set;
#endif
{
reg int oflags;
SFMTXSTART(f,0);
if(flags == 0 && set == 0)
SFMTXRETURN(f, (f->flags&SF_FLAGS));
if((oflags = (f->mode&SF_RDWR)) != (int)f->mode && _sfmode(f,oflags,0) < 0)
SFMTXRETURN(f, 0);
if(flags == 0)
SFMTXRETURN(f, (f->flags&SF_FLAGS));
SFLOCK(f,0);
oflags = f->flags;
if(!(f->bits&SF_BOTH) || (flags&SF_RDWR) == SF_RDWR )
flags &= ~SF_RDWR;
if(set)
f->flags |= (flags&SF_SETS);
else f->flags &= ~(flags&SF_SETS);
if(!(f->flags&SF_RDWR))
f->flags |= (oflags&SF_RDWR);
if(f->extent < 0)
f->flags &= ~SF_APPENDWR;
if((flags &= SF_RDWR) )
{ if(!set)
{ if(flags == SF_READ)
flags = SF_WRITE;
else flags = SF_READ;
}
if((flags == SF_WRITE && !(f->mode&SF_WRITE)) ||
(flags == SF_READ && !(f->mode&(SF_READ|SF_SYNCED))) )
(void)_sfmode(f,flags,1);
}
if(!(f->flags&SF_SHARE) || f->extent < 0)
f->flags &= ~SF_PUBLIC;
SFOPEN(f,0);
SFMTXRETURN(f, (oflags&SF_FLAGS));
}