/**************************************************************************/
/*                                 Prefix  Utility                        */
/*                                                                        */
/*                                     M\Cooper                           */
/*                                    PO Box 237                          */
/*                            St. David, AZ 85630-0237                    */
/*                        -------------------------------                 */
/*                            thegrendel@theriver.com                     */
/*                  http://personal.riverusers.com/~thegrendel/           */
/*                                                                        */
/*                  $2.00 to register the entire WORDY package            */
/*                                                                        */
/**************************************************************************/


#include <conio.h>
#include "srch.h"


#define FILE_OPENING_ERROR 3
#define FILENAME_MAXLEN 8
#define CR "\n"
#define FILE_SUFFIX ".pre"
#define MAXLEN 30
#define LINE_LEN 80
#define NOARGS 1
#define INCREMENT 0
#define SPACE ' '
#define WD 8

#define BUFFERSIZE 8192

char ad[] =
"PREFIX utility by M\\Cooper, thegrendel@theriver.com";

typedef enum { FALSE, TRUE } Boolean;

void getword( char *lset, char *filenam );
void center( char *strng );
Boolean wordtest( char *lset, char *wd, size_t len );


void main( int argc, char **argv )
{

   char letterset [ MAXLEN ],
        filename [ MAXLEN ];

	 if( argc == NOARGS )
	    {
	    clrscr();
	    puts("Enter a LETTERSET to test ... ");
	    gets( letterset );
     strcpy( filename, "word.lst" );
	    }
  else
	    if( argc == NOARGS + 1 )
        {
	       strcpy( letterset, *( argv + 1 ) );
        strcpy( filename, "word.lst" );
        }
     else
         {
         strcpy( letterset, *( argv + 1 ) );
         strcpy( filename,  *( argv + 2 ) );
         }

	 getword( letterset, filename );
}


/**********************************WORDTEST********************************/
/*       Function tests if word is constructible from Letterset           */
/*                 Args in: char *letterset, char *word                   */
/*   Returns: error_flag == TRUE (1) if constructible, FALSE (0) if not   */
/**************************************************************************/

Boolean wordtest( char *letterset, char *word, size_t l_len )
{
	Boolean error_flag;

      if( !strncmp( letterset, word, l_len ) )
         error_flag = TRUE;
      else
         error_flag = FALSE;
		return( error_flag );
}

/****************************************************************************/

void getword( char *letter_set, char *filename )
{

	char	l_set [ MAXLEN ],
		word [ MAXLEN ],
		tempstr [ MAXLEN + 1 ],
		targetfile [ MAXLEN ],
   wd [ WD ],
   wd2 [ WD ],
		bar [ LINE_LEN + 1 ],
		double_bar [ LINE_LEN + 1 ];
   size_t l_len;

	FILE *fptr,
		*tfile;
	int fnamelen;
	long wcount = 0L;


      l_len = strlen( letter_set );
	   memset( bar, '-', LINE_LEN );
	   *( bar + LINE_LEN ) = NULL;
	   memset( double_bar, '=', LINE_LEN );
	   *( double_bar + LINE_LEN ) = NULL;

	   /*************opening credits*************/
	   clrscr();
	   printf( double_bar );
	   strcpy( tempstr, ad );
	   center ( tempstr );
	   printf( tempstr );
	   printf( CR );
	   printf( double_bar );
	   printf( CR );
	   /****************************************/


	   strcpy ( l_set, letter_set );
//	   strcat ( letter_set, CR );

	   /*   Create name of file to store derived words in   */
	   /*********************************************************/
	   fnamelen = strlen( l_set );
	   if( fnamelen  > FILENAME_MAXLEN )
		  fnamelen = FILENAME_MAXLEN;
	   strncpy( targetfile, l_set, fnamelen );
	   *( targetfile + fnamelen ) = NULL;
	   //NULL-terminate string, so strcat works, ha, ha.
	   strcat( targetfile, FILE_SUFFIX );
	   /*********************************************************/

	   if( !( fptr = fopen( filename, "rt" ) ) )
		 {
		 printf( "\7\7\7Cannot open Wordfile!" );
		 exit( FILE_OPENING_ERROR );
		 }
      if( setvbuf( fptr, NULL, _IOFBF, BUFFERSIZE * 2 ) )
         exit( FILE_OPENING_ERROR + 1 );

	   if( !( tfile = fopen( targetfile, "wt" ) ) )
		 {
		 printf( "\7\7\7Cannot open file to save words in!" );
		 exit ( FILE_OPENING_ERROR + 2 );
		 }
      if( setvbuf( tfile, NULL, _IOFBF, BUFFERSIZE ) )
         exit( FILE_OPENING_ERROR + 3 );

	   /**************'Wait' Message************/
	   printf( CR CR );
	   printf( "WORKING...\n\n" );
	   printf( "This will take a few seconds...\n" );
	   printf( "Please be patient.\n\n" );
	   printf(
"Now searching 171,000+ word file \nand writing file of valid words prefixed %s-.\n\n",
            letter_set );
	   /*****************************************/





	   sprintf( tempstr, "Word(s) created from: %s\n", strupr( l_set ) );
	   center( tempstr );
	   fprintf( tfile, double_bar );
      fprintf( tfile, CR );
	   fprintf( tfile, tempstr );
	   fprintf( tfile, double_bar );
	   fprintf( tfile, CR );


		 /*********************Main Loop*************/	 
		  while( fgets( word, MAXLEN, fptr ) != NULL )

			if( wordtest( letter_set, word, l_len ) )
			   {
			   fprintf( tfile, "%s", word );
			   wcount++;
			   }
		  /*******************************************/

      if( wcount == 1)
         {
         strcpy( wd, "word" );
         strcpy( wd2, "has" );
         }
      else
         {
         strcpy( wd, "words" );
         strcpy( wd2, "have" );
         }

		  fprintf( tfile, bar );
      fprintf( tfile, CR );
		  sprintf( tempstr, "%ld %s prefixed %s %s been found.",
				 wcount - INCREMENT, wd, l_set, wd2 );
		  center( tempstr );		      
		  fprintf( tfile, tempstr );
		  fprintf( tfile, "\n\n" );

		  center( ad );
		  fprintf( tfile, ad );

		  fcloseall();

		  sprintf( tempstr,
				 "The file %s has %ld %s prefixed %s\7.",
				 targetfile, wcount - INCREMENT, wd, l_set );
		  center( tempstr );
		  printf( CR CR );
		  printf( tempstr );

}



void center( char *str )
{
   int padding;
   char st [ LINE_LEN + INCREMENT ];

	 padding = LINE_LEN / 2 - strlen( str ) / 2;
	 memset( st, SPACE, padding );
	 *( st + padding ) = NULL;  //Terminate string
	 strcat( st, str );
	 strcpy( str, st );

	 return;
}