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FFLUSH.C
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C/C++ Source or Header
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1993-08-03
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2KB
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75 lines
/* from Dale Schumacher's dLibs */
#include <stdio.h>
#include <unistd.h>
#include "lib.h"
static int _fflush __PROTO((FILE *));
int fflush(fp)
register FILE *fp;
/*
* implementation note: This function has the side effect of
* re-aligning the virtual file pointer (in the buffer) with
* the actual file pointer (in the file) and is therefore used
* in other functions to accomplish this re-sync operation.
*/
{
register int f, i;
if(fp)
return(_fflush(fp));
else
{
for(i=0; i<_NFILE; ++i)
{
f = _iob[i]._flag;
if(f & (_IOREAD | _IOWRT | _IORW))
_fflush(&_iob[i]);
}
return(0);
}
}
static int _fflush(fp)
register FILE *fp;
{
register int f, rv = 0;
register long offset;
if(fp == NULL)
return(0);
f = fp->_flag;
if (!(f & (_IORW | _IOREAD | _IOWRT))) /* file not open */
return(0);
if(fp->_cnt > 0) /* data in the buffer */
{
if(f & _IOWRT) /* writing */
{
register long todo;
/* _cnt is cleared before writing to avoid */
/* loop if fflush is recursively called by */
/* exit if ^C is pressed during this write */
todo = fp->_cnt;
fp->_cnt = 0;
if(_write(fp->_file, fp->_base, todo) != todo)
{
fp->_flag |= _IOERR;
rv = EOF;
}
}
else if(f & _IOREAD) /* reading */
{
offset = -(fp->_cnt);
if(lseek(fp->_file, offset, 1) < 0)
rv = EOF;
}
}
if(f & _IORW)
fp->_flag &= ~(_IOREAD | _IOWRT);
fp->_ptr = fp->_base;
fp->_cnt = 0;
return(rv);
}