File: tell.C

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

#include "npfile.h"

long NP_File::tell()
{
   if ( !is_open )
   {
      snprintf( error_message, sizeof error_message,
                "NP_File: tell(): No file is open for this object." );
      return -1;
   }

   int result = ftell( stream );

   if ( result < 0 )
      snprintf( error_message, sizeof error_message,
                "NP_File: tell(): %s", strerror( errno ));

   return result;
}