46 lines
1.0 KiB
C
46 lines
1.0 KiB
C
#include <stdio.h>
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extern _findbuf();
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extern int read();
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extern int fflush();
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extern FILE *_lastbuf;
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int
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_filbuf(iop)
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register FILE *iop;
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{
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register FILE *diop;
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if (iop->_base == NULL) /* get buffer if we don't have one */
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_findbuf(iop);
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if ( !(iop->_flag & _IOREAD) )
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if (iop->_flag & _IORW)
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iop->_flag |= _IOREAD;
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else
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return(EOF);
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/* if this device is a terminal (line-buffered) or unbuffered, then */
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/* flush buffers of all line-buffered devices currently writing */
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if (iop->_flag & (_IOLBF | _IONBF))
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for (diop = _iob; diop < _lastbuf; diop++ )
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if (diop->_flag & _IOLBF)
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(void) fflush(diop);
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iop->_ptr = iop->_base;
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iop->_cnt = read(fileno(iop), (char *)iop->_base,
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(unsigned)((iop->_flag & _IONBF) ? 1 : _bufsiz(iop) ));
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if (--iop->_cnt >= 0) /* success */
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return (*iop->_ptr++);
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if (iop->_cnt != -1) /* error */
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iop->_flag |= _IOERR;
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else { /* end-of-file */
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iop->_flag |= _IOEOF;
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if (iop->_flag & _IORW)
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iop->_flag &= ~_IOREAD;
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}
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iop->_cnt = 0;
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return (EOF);
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}
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