_strdup, _wcsdup, _mbsdup

Статья
10/16/2008

Duplicate strings.

char *_strdup(
   const char *strSource 
);
wchar_t *_wcsdup(
   const wchar_t *strSource 
);
unsigned char *_mbsdup(
   const unsigned char *strSource 
);

Параметры

strSource
Null-terminated source string.

Возвращаемое значение

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

Заметки

The _strdup function calls malloc to allocate storage space for a copy of strSource and then copies strSource to the allocated space.

_wcsdup and _mbsdup are wide-character and multibyte-character versions of _strdup. The arguments and return value of _wcsdup are wide-character strings; those of _mbsdup are multibyte-character strings. These three functions behave identically otherwise.

Generic-Text Routine Mappings

TCHAR.H routine	_UNICODE & _MBCS not defined	_MBCS defined	_UNICODE defined
_tcsdup	_strdup	_mbsdup	_wcsdup

Because _strdup calls malloc to allocate storage space for the copy of strSource, it is good practice always to release this memory by calling the free routine on the pointer returned by the call to _strdup.

If _DEBUG and _CRTDBG_MAP_ALLOC are defined, _strdup and _wcsdup are replaced by calls to _strdup_dbg and _wcsdup_dbg to allow for debugging memory allocations. For more information, see _strdup_dbg, _wcsdup_dbg.

Требования

Routine	Required header
_strdup	<string.h>
_wcsdup	<string.h> or <wchar.h>
_mbsdup	<mbstring.h>

For additional compatibility information, see Compatibility in the Introduction.

Пример

// crt_strdup.c

#include <string.h>
#include <stdio.h>

int main( void )
{
   char buffer[] = "This is the buffer text";
   char *newstring;
   printf( "Original: %s\n", buffer );
   newstring = _strdup( buffer );
   printf( "Copy:     %s\n", newstring );
   free( newstring );
}

Original: This is the buffer text
Copy:     This is the buffer text