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_getcwd_dbg, _wgetcwd_dbg


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The latest version of this topic can be found at _getcwd_dbg, _wgetcwd_dbg.

Debug versions of the _getcwd, _wgetcwd functions (only available during debug).

char *_getcwd_dbg(   
   char *buffer,  
   int maxlen,  
   int blockType,  
   const char *filename,  
   int linenumber   
wchar_t *_wgetcwd_dbg(   
   wchar_t *buffer,  
   int maxlen,  
   int blockType,  
   const char *filename,  
   int linenumber   


Storage location for the path.

Maximum length of the path in characters: char for _getcwd_dbg and wchar_t for _wgetcwd_dbg.

Requested type of the memory block: _CLIENT_BLOCK or _NORMAL_BLOCK.

Pointer to the name of the source file that requested the allocation operation or NULL.

Line number in the source file where the allocation operation was requested or NULL.

Returns a pointer to 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.

For more information, see errno, _doserrno, _sys_errlist, and _sys_nerr.

The _getcwd_dbg and _wgetcwd_dbg functions are identical to _getcwd and _wgetcwd except that, when _DEBUG is defined, these functions use the debug version of malloc and _malloc_dbg to allocate memory if NULL is passed as the first parameter. For more information, see _malloc_dbg.

You do not need to call these functions explicitly in most cases. Instead, you can define the _CRTDBG_MAP_ALLOC flag. When _CRTDBG_MAP_ALLOC is defined, calls to _getcwdand _wgetcwdare remapped to _getcwd_dbgand _wgetcwd_dbg, respectively, with the blockType set to _NORMAL_BLOCK. Thus, you do not need to call these functions explicitly unless you want to mark the heap blocks as _CLIENT_BLOCK. For more information, see Types of blocks on the debug heap.

Tchar.h routine_UNICODE and _MBCS not defined_MBCS defined_UNICODE defined
RoutineRequired header

For more compatibility information, see Compatibility in the Introduction.


_getcwd, _wgetcwd
Directory Control
Debug Versions of Heap Allocation Functions