getcwd.cpp File Reference

#include <corecrt_internal.h>
#include <corecrt_internal_traits.h>
#include <direct.h>
#include <errno.h>
#include <malloc.h>
#include <stdlib.h>

Include dependency graph for getcwd.cpp:

Go to the source code of this file.

Functions
static int __cdecl	is_valid_drive (unsigned const drive_number) throw ()
template<typename Character >
	_Success_ (return !=0) _Ret_z_ static Character *__cdecl common_getdcwd(int drive_number
	_Out_writes_opt_z_ (max_count) Character *user_buffer
int const int const _In_opt_z_ char const *const int const line_number	throw ()
char *__cdecl	_getcwd (char *const user_buffer, int const max_length)
wchar_t *__cdecl	_wgetcwd (wchar_t *const user_buffer, int const max_length)
char *__cdecl	_getdcwd (int const drive_number, char *const user_buffer, int const max_length)
wchar_t *__cdecl	_wgetdcwd (int const drive_number, wchar_t *const user_buffer, int const max_length)

Variables
int const	max_count
int const int const	block_use
int const int const _In_opt_z_ char const *const	file_name

Function Documentation

_getcwd()

char *__cdecl _getcwd	(	char *const	user_buffer,
		int const	max_length
	)

Definition at line 180 of file getcwd.cpp.

{
    return common_getdcwd(0, user_buffer, max_length, _NORMAL_BLOCK, nullptr, 0);
}

_getdcwd()

char *__cdecl _getdcwd	(	int const	drive_number,
		char *const	user_buffer,
		int const	max_length
	)

Definition at line 196 of file getcwd.cpp.

{
    return common_getdcwd(drive_number, user_buffer, max_length, _NORMAL_BLOCK, nullptr, 0);
}

_Out_writes_opt_z_()

_Out_writes_opt_z_

(

max_count

)

_Success_()

template<typename Character >

_Success_

(

return !

= 0

)

_wgetcwd()

wchar_t *__cdecl _wgetcwd	(	wchar_t *const	user_buffer,
		int const	max_length
	)

Definition at line 188 of file getcwd.cpp.

{
    return common_getdcwd(0, user_buffer, max_length, _NORMAL_BLOCK, nullptr, 0);
}

_wgetdcwd()

wchar_t *__cdecl _wgetdcwd	(	int const	drive_number,
		wchar_t *const	user_buffer,
		int const	max_length
	)

Definition at line 205 of file getcwd.cpp.

{
    return common_getdcwd(drive_number, user_buffer, max_length, _NORMAL_BLOCK, nullptr, 0);
}

is_valid_drive()

static int __cdecl is_valid_drive ( unsigned const  drive_number ) throw ( )

static

Definition at line 26 of file getcwd.cpp.

{
    if (drive_number > 26)
    {
        _doserrno = ERROR_INVALID_DRIVE;
        _VALIDATE_RETURN(("Invalid Drive Index" ,0), EACCES, 0);
    }
 
    if (drive_number == 0)
        return 1;
 
#pragma warning(suppress:__WARNING_UNUSED_ASSIGNMENT) // 28931
    wchar_t const drive_letter   = static_cast<wchar_t>(L'A' + drive_number - 1);
    wchar_t const drive_string[] = { drive_letter, L':', L'\\', L'\0' };
 
    UINT const drive_type = GetDriveTypeW(drive_string);
    if (drive_type == DRIVE_UNKNOWN || drive_type == DRIVE_NO_ROOT_DIR)
        return 0;
 
    return 1;
}

Referenced by throw().

throw()

int const int const _In_opt_z_ char const *const int const line_number throw

(

)

Definition at line 117 of file getcwd.cpp.

{
    typedef __crt_char_traits<Character> traits;
 
    _VALIDATE_RETURN(max_count >= 0, EINVAL, nullptr);
 
    if (drive_number != 0)
    {
        // A drive other than the default drive was requested; make sure it
        // is a valid drive number:
        if (!is_valid_drive(drive_number))
        {
            _doserrno = ERROR_INVALID_DRIVE;
            _VALIDATE_RETURN(("Invalid Drive", 0), EACCES, nullptr);
        }
    }
    else
    {
        // Otherwise, get the drive number of the default drive:
        drive_number = _getdrive();
    }
 
    Character drive_string[4];
    if (drive_number != 0)
    {
        drive_string[0] = static_cast<Character>('A' - 1 + drive_number);
        drive_string[1] = ':';
        drive_string[2] = '.';
        drive_string[3] = '\0';
    }
    else
    {
        drive_string[0] = '.';
        drive_string[1] = '\0';
    }
 
    if (user_buffer == nullptr)
    {   // Always new memory suitable for debug mode and releasing to the user.
        __crt_public_win32_buffer<Character> buffer(
            __crt_win32_buffer_debug_info(block_use, file_name, line_number)
        );
        buffer.allocate(max_count);
        if (!traits::get_full_path_name(drive_string, buffer))
        {
            return buffer.detach();
        }
        return nullptr;
    }
 
    // Using user buffer. Fail if not enough space.
    _VALIDATE_RETURN(max_count > 0, EINVAL, nullptr);
    user_buffer[0] = '\0';
 
    __crt_no_alloc_win32_buffer<Character> buffer(user_buffer, max_count);
    if (!traits::get_full_path_name(drive_string, buffer))
    {
        return user_buffer;
    }
    return nullptr;
};

Variable Documentation

block_use

int const int const block_use

Definition at line 114 of file getcwd.cpp.

Referenced by throw().

file_name

int const int const _In_opt_z_ char const* const file_name

Definition at line 115 of file getcwd.cpp.

Referenced by throw().

max_count

int const max_count

Definition at line 113 of file getcwd.cpp.

Referenced by throw().