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_strdup_dbg, _wcsdup_dbg

Versions of _strdup and _wcsdup that use the debug version of malloc.

char *_strdup_dbg(
   const char *strSource,
   int blockType,
   const char *filename,
   int linenumber 
);
wchar_t *_wcsdup_dbg(
   const wchar_t *strSource,
   int blockType,
   const char *filename,
   int linenumber 
);

strSource

Null-terminated source string.

blockType

Requested type of memory block: _CLIENT_BLOCK or _NORMAL_BLOCK.

filename

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

linenumber

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

Each of these functions returns a pointer to the storage location for the copied string or NULL if storage cannot be allocated.

The _strdup_dbg and _wcsdup_dbg functions are identical to _strdup and _wcsdup except that, when _DEBUG is defined, these functions use the debug version of malloc, _malloc_dbg, to allocate memory for the duplicated string. For information on the debugging features of _malloc_dbg, see _malloc_dbg.

You do not need to call these functions explicitly in most cases. Instead, you can define the flag _CRTDBG_MAP_ALLOC. When _CRTDBG_MAP_ALLOC is defined, calls to _strdup and _wcsdup are remapped to _strdup_dbg and _wcsdup_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 on block types, see Types of Blocks on the Debug Heap.

Generic-Text Routine Mappings

TCHAR.H routine

_UNICODE & _MBCS not defined

_MBCS defined

_UNICODE defined

_tcsdup_dbg

_strdup_dbg

_mbsdup

_wcsdup_dbg

Routine

Required header

_strdup_dbg, _wcsdup_dbg

<crtdbg.h>

For additional compatibility information, see Compatibility in the Introduction.

Libraries

All debug versions of the C run-time libraries.

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