filelength.cpp File Reference

#include <corecrt_internal_lowio.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>

Include dependency graph for filelength.cpp:

Go to the source code of this file.

Functions
template<typename Integer >
	_Success_ (return !=-1) static Integer __cdecl common_filelength(int const fh) throw ()
long __cdecl	_filelength (int const fh)
__int64 __cdecl	_filelengthi64 (int const fh)

Function Documentation

_filelength()

long __cdecl _filelength

(

int const

fh

)

Definition at line 55 of file filelength.cpp.

{
    return common_filelength<long>(fh);
}

_filelengthi64()

__int64 __cdecl _filelengthi64

(

int const

fh

)

Definition at line 60 of file filelength.cpp.

{
    return common_filelength<__int64>(fh);
}

_Success_()

template<typename Integer >

_Success_	(	return !	= -1	)	const
throw	(
	)

Definition at line 17 of file filelength.cpp.

{
    typedef __crt_integer_traits<Integer> traits;
 
    _CHECK_FH_CLEAR_OSSERR_RETURN(fh, EBADF, -1);
    _VALIDATE_CLEAR_OSSERR_RETURN(fh >= 0 && (unsigned)fh < (unsigned)_nhandle, EBADF, -1);
    _VALIDATE_CLEAR_OSSERR_RETURN(_osfile(fh) & FOPEN,                          EBADF, -1);
 
    __acrt_lowio_lock_fh(fh);
    Integer end = -1;
    __try
    {
        if ((_osfile(fh) & FOPEN) == 0)
        {
            errno = EBADF;
            _doserrno = 0;
            _ASSERTE(("Invalid file descriptor. File possibly closed by a different thread", 0));
            __leave;
        }
 
        // Seek to the end to get the length:
        Integer const here = traits::lseek_nolock(fh, 0, SEEK_CUR);
        if (here == -1)
            __leave;
 
        end = traits::lseek_nolock(fh, 0, SEEK_END);
        if (here != end)
            traits::lseek_nolock(fh, here, SEEK_SET);
    }
    __finally
    {
        __acrt_lowio_unlock_fh(fh);
    }
    __endtry
    return end;
}