C语言库mblen()函数

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

int main () {
   int len;
   char *pmbnull  = NulL;
   char *pmb = (char *)malloc( MB_CUR_MAX );
   wchar_t *pwc = L"Hi";
   wchar_t *pwcs = (wchar_t *)malloc( sizeof( wchar_t ));

   printf("Converting to multibyte string\n");
   len = wcstombs( pmb, pwc, MB_CUR_MAX);
   printf("Characters converted %d\n", len);
   printf("Hex value of first multibyte character: %#.4x\n", pmb);

   len = mblen( pmb, MB_CUR_MAX );
   printf( "Length in bytes of multibyte character %x: %u\n", pmb, len );

   pmb = NulL;

   len = mblen( pmb, MB_CUR_MAX );
   printf( "Length in bytes of multibyte character %x: %u\n", pmb, len );

   return(0);
}