/*  Filecopy.c  (c) Kari Laitinen

    http://www.naturalprogramming.com/

    2013-11-28  File created.
    2013-11-28  Last modification.

*/

#include  <stdio.h>

int  main()
{
   FILE*  file_to_be_copied ;
   FILE*  new_duplicate_file ;
   char   name_of_file_to_be_copied[ 20 ] ;
   char   name_of_new_duplicate_file[ 20 ] ;
   char   text_line_from_file[ 100 ] ;
   int    text_line_counter  =  0 ;

   printf( "\n This program copies text from one file"
           "\n to another file. Please, give the name of"
           "\n the file to be copied: " ) ;

   gets( name_of_file_to_be_copied ) ;

   printf( "\n Please, give the name of the duplicate file: " ) ;

   gets( name_of_new_duplicate_file ) ;

   file_to_be_copied   =  fopen( name_of_file_to_be_copied, "r" ) ;
   new_duplicate_file  =  fopen( name_of_new_duplicate_file,  "w" ) ;

   if ( file_to_be_copied  ==  0 )
   {
      printf( "\n Cannot open file %s\n", name_of_file_to_be_copied ) ;
   }
   else
   {
      if ( new_duplicate_file  ==  0 )
      {
         printf( "\n Cannot open file %s\n", name_of_new_duplicate_file ) ;
      }
      else
      {
         printf( "\nCopying in progress ... \n" ) ;

         while( fgets( text_line_from_file,
                       sizeof ( text_line_from_file ),
                       file_to_be_copied ) != 0  )
         {
            fputs( text_line_from_file, new_duplicate_file ) ;
            text_line_counter  ++  ;
         }

         fclose( new_duplicate_file ) ;

         printf( "\nCopying ready. %d lines were copied. \n",
                 text_line_counter ) ;
      }

      fclose( file_to_be_copied ) ;
   }
}