waccess.cpp File Reference

#include <corecrt_internal.h>
#include <io.h>

Include dependency graph for waccess.cpp:

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Functions
errno_t __cdecl	_waccess_s (wchar_t const *const path, int const access_mode)
int __cdecl	_waccess (wchar_t const *const path, int const access_mode)

Function Documentation

_waccess()

int __cdecl _waccess	(	wchar_t const *const	path,
		int const	access_mode
	)

Definition at line 52 of file waccess.cpp.

{
    return _waccess_s(path, access_mode) == 0 ? 0 : -1;
}

_waccess_s()

errno_t __cdecl _waccess_s	(	wchar_t const *const	path,
		int const	access_mode
	)

Definition at line 17 of file waccess.cpp.

{
    _VALIDATE_CLEAR_OSSERR_RETURN_ERRCODE(path != nullptr,           EINVAL);
    _VALIDATE_CLEAR_OSSERR_RETURN_ERRCODE((access_mode & (~6)) == 0, EINVAL);
 
    WIN32_FILE_ATTRIBUTE_DATA attributes;
    if (!GetFileAttributesExW(path, GetFileExInfoStandard, &attributes))
    {
        __acrt_errno_map_os_error(GetLastError());
        return errno;
    }
 
    // All directories have both read and write access:
    if (attributes.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
        return 0;
 
    // If we require write access, make sure the read only flag is not set:
    bool const file_is_read_only = (attributes.dwFileAttributes & FILE_ATTRIBUTE_READONLY) != 0;
    bool const mode_requires_write = (access_mode & 2) != 0;
    
    if (file_is_read_only && mode_requires_write)
    {
        _doserrno = ERROR_ACCESS_DENIED;
        errno = EACCES;
        return errno;
    }
 
    // Otherwise, the file is accessible:
    return 0;
 
}

Referenced by _waccess().