Using _strdup , _tcsdup , _mbsdup

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.

_UNICODE & _MBCS not defined:Use _strdup  defined in <string.h>

_MBCS defined:Use _mbsdup defined in <mbstring.h>

_UNICODE defined: Use _wcsdup defined in <string.h> or <wchar.h>

TCHAR.H routine : Use _tcsdup

Syntax:

char *_strdup(const char *strSource);

char *_tcsdup(const char *strSource);

wchar_t *_wcsdup(const wchar_t *strSource);

unsigned char *_mbsdup(const unsigned char *strSource);

strSource:

Null-terminated source string.

Return Value:

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

Example:

// _strdup.c

#include <string.h>

#include <stdio.h>

#include <malloc.h>

#include <conio.h>

void 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 );

   getch();

}

Output:

Original: This is the buffer text

Copy:This is the buffer text

// _tcsdup.cpp

#include <string.h>

#include <iostream.h>

#include <malloc.h>

#include <conio.h>

int main( void )

{

   char buffer[] = "This is the buffer text";

   char *newstring;

   cout<< "Original:"<< buffer;

   newstring = _strdup( buffer );

   cout<<"Copied string:"<<newstring;

   free(newstring);

   getch();
return 0;

}

Output:

Original: This is the buffer text

Copied string:This is the buffer text