i18n programming question

[50191914@ee.cityu.edu.hk]

I write the following code to test the mbtowc function:
#include <stdlib.h>
#include <locale.h>
int main(int argc,char **argv)
{                             
  wchar_t pwc;
  int consumed;
  setlocale(LC_ALL,"zh_TW.Big5");
  if(argc > 1)                   
    {         
      int length=strlen(argv[1]);
      int i=0;                   
      while(consumed=mbtowc(&pwc,argv[1]+i,length-i)>0)
        {                                              
          printf("Consumed Byte %d\n",consumed); 
          printf("Character : %lc\n",pwc);       
          i+=consumed;                    
        }             
    }    

}

Here is the output:
hingwah@hingwah:~/programming/i18n$./testcharacter 意非凡BBS
Consumed Byte 1
Character : 意
Consumed Byte 1
Character : N
Consumed Byte 1
Character : 非
Consumed Byte 1
Character : D
Consumed Byte 1
Character : 凡
Consumed Byte 1
Character : Z
Consumed Byte 1
Character : B
Consumed Byte 1
Character : B
Consumed Byte 1
Character : S

And I want to ask isn't the mbtowc function should return 2 as it consume 2 byte
to construct the chinese character?

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