_eof
Visual Studio 2012
Tests for end of file (EOF).
int _eof( int fd );
_eof returns 1 if the current position is end of file, or 0 if it is not. A return value of –1 indicates an error; in this case, the invalid parameter handler is invoked, as described in Parameter Validation. If execution is allowed to continue, errno is set to EBADF, which indicates an invalid file descriptor.
|
Function |
Required header |
Optional header |
|---|---|---|
|
_eof |
<io.h> |
<errno.h> |
For more compatibility information, see Compatibility in the Introduction.
// crt_eof.c
// This program reads data from a file
// ten bytes at a time until the end of the
// file is reached or an error is encountered.
//
#include <io.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <share.h>
int main( void )
{
int fh, count, total = 0;
char buf[10];
if( _sopen_s( &fh, "crt_eof.txt", _O_RDONLY, _SH_DENYNO, 0 ) )
{
perror( "Open failed");
exit( 1 );
}
// Cycle until end of file reached:
while( !_eof( fh ) )
{
// Attempt to read in 10 bytes:
if( (count = _read( fh, buf, 10 )) == -1 )
{
perror( "Read error" );
break;
}
// Total actual bytes read
total += count;
}
printf( "Number of bytes read = %d\n", total );
_close( fh );
}
Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
