_getdcwd, _wgetdcwd

Get full path name of current working directory on the specified drive.

char *_getdcwd( int drive, char *buffer, int maxlen );

wchar_t *_wgetdcwd( int drive, wchar_t *buffer, int maxlen );

For additional compatibility information, see Compatibility in the Introduction.

Libraries

Return Value

Each of these functions returns buffer. A NULL return value indicates an error, and errno is set either to ENOMEM, indicating that there is insufficient memory to allocate maxlen bytes (when a NULL argument is given as buffer), or to ERANGE, indicating that the path is longer than maxlen characters.

Parameters

drive

Disk drive

buffer

Storage location for path

maxlen

Maximum length of path

Remarks

The _getdcwd function gets the full path of the current working directory on the specified drive and stores it at buffer. An error occurs if the length of the path (including the terminating null character) exceeds maxlen. The drive argument specifies the drive (0 = default drive, 1 = A, 2 = B, and so on). The buffer argument can be NULL; a buffer of at least size maxlen (more only if necessary) will automatically be allocated, using malloc, to store the path. This buffer can later be freed by calling free and passing it the _getdcwd return value (a pointer to the allocated buffer).

_getdcwd returns a string that represents the path of the current working directory. If the current working directory is set to the root, the string ends with a backslash ( \ ). If the current working directory is set to a directory other than the root, the string ends with the name of the directory and not with a backslash.

_wgetdcwd is a wide-character version of _getdcwd; the buffer argument and return value of _wgetdcwd are wide-character strings. _wgetdcwd and _getdcwd behave identically otherwise.

Generic-Text Routine Mappings

Example

/* GETDRIVE.C illustrates drive functions including:
 *      _getdrive       _chdrive        _getdcwd
 */

#include <stdio.h>
#include <conio.h>
#include <direct.h>
#include <stdlib.h>
#include <ctype.h>

void main( void )
{
   int ch, drive, curdrive;
   static char path[_MAX_PATH];

   /* Save current drive. */
   curdrive = _getdrive();

   printf( "Available drives are: \n" );

   /* If we can switch to the drive, it exists. */
   for( drive = 1; drive <= 26; drive++ )
      if( !_chdrive( drive ) )
         printf( "%c: ", drive + 'A' - 1 );

   while( 1 )
   {
      printf( "\nType drive letter to check or ESC to quit: " );
      ch = _getch();
      if( ch == 27 )
         break;
      if( isalpha( ch ) )
         _putch( ch );
      if( _getdcwd( toupper( ch ) - 'A' + 1, path, _MAX_PATH ) != NULL )
         printf( "\nCurrent directory on that drive is %s\n", path );
   }

   /* Restore original drive.*/
   _chdrive( curdrive );
   printf( "\n" );
}

Output

Available drives are:
A: B: C: L: M: O: U: V: 
Type drive letter to check or ESC to quit: c
Current directory on that drive is C:\CODE

Type drive letter to check or ESC to quit: m
Current directory on that drive is M:\

Type drive letter to check or ESC to quit: 

Directory Control Routines

See Also   _chdir, _getcwd, _getdrive, _mkdir, _rmdir