#include<stdio.h>
#include<wchar.h>

void convertMultiBytes(wchar_t *wchar, char *mbyte);

main()
{
FILE *fp;
wchar_t *aa;
char c[100];
int l=0;
if((fp=fopen("tmp.txt", "r")) == NULL) {
    printf("Cannot open file.\n");
    exit(1);
  }
fgets(c,25,fp);
l=strlen(c);
printf("%d",l);
aa=(wchar_t *)malloc((l+1)*4);
memset (aa, 0, (l + 1)*4);
convertMultiBytes(aa,c);
printf("Entered maultybyte string:%s\nConveted wild char string:%ls\n",c,aa);
}


void convertMultiBytes(wchar_t *wchar, char *mbyte)
{
   int n;
   char *end,*start;
   n = strlen(mbyte) + 1;
   /* convert multibyte string to wide character string */
   if (mbstowcs(wchar,mbyte,n) == (size_t)-1)
   {
       printf("ERROR: Could not convert multibyte character to wide char code\n");
       convertBytebyByte(wchar,mbyte,n);
   }
}
void convertBytebyByte(wchar_t *wchar, char *mbyte, int n)
{
   int mbcnt;
   char *end,*start;
   end = mbyte + n;
   start = mbyte;

   for(;start <= end;)
   {
       mbcnt = mbtowc(wchar,start,20);
       if(mbcnt > 0)
       {
           start += mbcnt;
           wchar++;
       }
       else
       {
           printf("Invalid multibyte character occured\n");
           printf("Converting the invalid character to '?'\n");
           *wchar = '?';
           start++;
       }
   }
}