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#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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