#include "sfhdr.h"
#if __STD_C
Sfio_t* sfnew(Sfio_t* oldf, Void_t* buf, size_t size, int file, int flags)
#else
Sfio_t* sfnew(oldf,buf,size,file,flags)
Sfio_t* oldf;
Void_t* buf;
size_t size;
int file;
int flags;
#endif
{
reg Sfio_t* f;
reg int sflags;
SFONCE();
if(!(flags&SF_RDWR))
return NIL(Sfio_t*);
sflags = 0;
if((f = oldf) )
{ if(flags&SF_EOF)
{ if(f != sfstdin && f != sfstdout && f != sfstderr)
f->mutex = NIL(Vtmutex_t*);
SFCLEAR(f, f->mutex);
oldf = NIL(Sfio_t*);
}
else if(f->mode&SF_AVAIL)
{
if(!(f->flags&SF_STATIC) )
return NIL(Sfio_t*);
sflags = f->flags;
oldf = NIL(Sfio_t*);
}
else
{
sflags = f->flags;
if(((f->mode&SF_RDWR) != f->mode && _sfmode(f,0,0) < 0) ||
SFCLOSE(f) < 0 )
return NIL(Sfio_t*);
if(f->data && ((flags&SF_STRING) || size != (size_t)SF_UNBOUND) )
{ if(sflags&SF_MALLOC)
free((Void_t*)f->data);
f->data = NIL(uchar*);
}
if(!f->data)
sflags &= ~SF_MALLOC;
}
}
if(!f)
{
if(!(flags&SF_STRING) && file >= 0 && file <= 2)
{ f = file == 0 ? sfstdin : file == 1 ? sfstdout : sfstderr;
if(f)
{ if(f->mode&SF_AVAIL)
{ sflags = f->flags;
SFCLEAR(f, f->mutex);
}
else f = NIL(Sfio_t*);
}
}
if(!f)
{ if(!(f = (Sfio_t*)malloc(sizeof(Sfio_t))) )
return NIL(Sfio_t*);
SFCLEAR(f, NIL(Vtmutex_t*));
}
}
#if vt_threaded
if(!f->mutex)
f->mutex = vtmtxopen(NIL(Vtmutex_t*), VT_INIT);
#endif
f->mode = (flags&SF_READ) ? SF_READ : SF_WRITE;
f->flags = (flags&SF_FLAGS) | (sflags&(SF_MALLOC|SF_STATIC));
f->bits = (flags&SF_RDWR) == SF_RDWR ? SF_BOTH : 0;
f->file = file;
f->here = f->extent = 0;
f->getr = f->tiny[0] = 0;
f->mode |= SF_INIT;
if(size != (size_t)SF_UNBOUND)
{ f->size = size;
f->data = size <= 0 ? NIL(uchar*) : (uchar*)buf;
}
f->endb = f->endr = f->endw = f->next = f->data;
if(_Sfnotify)
(*_Sfnotify)(f,SF_NEW,f->file);
if(f->flags&SF_STRING)
(void)_sfmode(f,f->mode&SF_RDWR,0);
return f;
}