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Annotation of researchv10dc/libI77/notused/stdiom.h, revision 1.1

1.1     ! root        1: /*     @(#)stdiom.h    1.1     */
        !             2: 
        !             3: /* The following macros improve performance of the stdio by reducing the
        !             4:        number of calls to _bufsync and _wrtchk.  _BUFSYNC has the same
        !             5:        effect as _bufsync, and _WRTCHK has the same effect as _wrtchk,
        !             6:        but often these functions have no effect, and in those cases the
        !             7:        macros avoid the expense of calling the functions.  */
        !             8: 
        !             9: #define _BUFSYNC(iop)  if (_bufend(iop) - iop->_ptr <   \
        !            10:                                ( iop->_cnt < 0 ? 0 : iop->_cnt ) )  \
        !            11:                                        _bufsync(iop)
        !            12: #define _WRTCHK(iop)   ((((iop->_flag & (_IOWRT | _IOEOF)) != _IOWRT) \
        !            13:                                || (iop->_base == NULL)  \
        !            14:                                || (iop->_ptr == iop->_base && iop->_cnt == 0 \
        !            15:                                        && !(iop->_flag & (_IONBF | _IOLBF)))) \
        !            16:                        ? _wrtchk(iop) : 0 )

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