17 lines
735 B
C
17 lines
735 B
C
/* @(#)stdiom.h 1.1 92/07/30 SMI; from S5R2 1.1 */
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/* The following macros improve performance of the stdio by reducing the
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number of calls to _bufsync and _wrtchk. _BUFSYNC has the same
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effect as _bufsync, and _WRTCHK has the same effect as _wrtchk,
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but often these functions have no effect, and in those cases the
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macros avoid the expense of calling the functions. */
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#define _BUFSYNC(iop) if ((iop->_base + iop->_bufsiz) - iop->_ptr < \
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( iop->_cnt < 0 ? 0 : iop->_cnt ) ) \
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_bufsync(iop)
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#define _WRTCHK(iop) ((((iop->_flag & (_IOWRT | _IOEOF)) != _IOWRT) \
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|| (iop->_base == NULL) \
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|| (iop->_ptr == iop->_base && iop->_cnt == 0 \
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&& !(iop->_flag & (_IONBF | _IOLBF)))) \
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? _wrtchk(iop) : 0 )
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