esrgpcpj/cfratnum/c_main.c

// $Header: /cvsroot/esrg/sfesrg/esrgpcpj/cfratnum/c_main.c,v 1.5 2002/01/27 17:58:15 dtashley Exp $

//--------------------------------------------------------------------------------
//Copyright 2002 David T. Ashley
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//IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
//ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
//
//  16. Limitation of Liability.
//
//  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
//WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
//THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
//GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
//USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
//DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
//PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
//EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
//SUCH DAMAGES.
//
//  17. Interpretation of Sections 15 and 16.
//
//  If the disclaimer of warranty and limitation of liability provided
//above cannot be given local legal effect according to their terms,
//reviewing courts shall apply local law that most closely approximates
//an absolute waiver of all civil liability in connection with the
//Program, unless a warranty or assumption of liability accompanies a
//copy of the Program in return for a fee.
//
//                     END OF TERMS AND CONDITIONS
//
//            How to Apply These Terms to Your New Programs
//
//  If you develop a new program, and you want it to be of the greatest
//possible use to the public, the best way to achieve this is to make it
//free software which everyone can redistribute and change under these terms.
//
//  To do so, attach the following notices to the program.  It is safest
//to attach them to the start of each source file to most effectively
//state the exclusion of warranty; and each file should have at least
//the "copyright" line and a pointer to where the full notice is found.
//
//    <one line to give the program's name and a brief idea of what it does.>
//    Copyright (C) <year>  <name of author>
//
//    This program is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.
//
//    This program is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
//Also add information on how to contact you by electronic and paper mail.
//
//  If the program does terminal interaction, make it output a short
//notice like this when it starts in an interactive mode:
//
//    <program>  Copyright (C) <year>  <name of author>
//    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
//    This is free software, and you are welcome to redistribute it
//    under certain conditions; type `show c' for details.
//
//The hypothetical commands `show w' and `show c' should show the appropriate
//parts of the General Public License.  Of course, your program's commands
//might be different; for a GUI interface, you would use an "about box".
//
//  You should also get your employer (if you work as a programmer) or school,
//if any, to sign a "copyright disclaimer" for the program, if necessary.
//For more information on this, and how to apply and follow the GNU GPL, see
//<http://www.gnu.org/licenses/>.
//
//  The GNU General Public License does not permit incorporating your program
//into proprietary programs.  If your program is a subroutine library, you
//may consider it more useful to permit linking proprietary applications with
//the library.  If this is what you want to do, use the GNU Lesser General
//Public License instead of this License.  But first, please read
//<http://www.gnu.org/philosophy/why-not-lgpl.html>.
//-------------------------------------------------------------------------------------------------
//--------------------------------------------------------------------------------
#include <malloc.h>
#include <stdio.h>
#include <string.h>
#include <time.h>

#include "bstrfunc.h"
#include "ccmalloc.h"
#include "ccmfatal.h"
#include "charfunc.h"
#include "cu_msgs.h"
#include "fcmiof.h"
#include "gmp_ints.h"
#include "gmp_rats.h"
#include "gmp_ralg.h"
#include "intfunc.h"


#define PNAME "cfratnum"
#define PNAMEUC "CFRATNUM"


const char *C_MAIN_cvcinfo(void)
   {
   return("$Header: /cvsroot/esrg/sfesrg/esrgpcpj/cfratnum/c_main.c,v 1.5 2002/01/27 17:58:15 dtashley Exp $");
   }


//This is a NULL-terminated table of pointers to functions
//which return version control strings for all of the files
//which make up the INTFAC program.  This information would
//be helpful for debugging.
static const char *(*C_MAIN_vcinfoptrs[])(void) =
   {
   //This is the main module, should come first.
   C_MAIN_cvcinfo,

   //And now the others, in alphabetical order.
   BSTRFUNC_hvcinfo,
   BSTRFUNC_cvcinfo,
   CCMALLOC_hvcinfo,
   CCMALLOC_cvcinfo,
   CCMFATAL_hvcinfo,
   CCMFATAL_cvcinfo,
   CHARFUNC_hvcinfo,
   CHARFUNC_cvcinfo,
   CU_MSGS_hvcinfo,
   CU_MSGS_cvcinfo,
   FCMIOF_hvcinfo,
   FCMIOF_cvcinfo,
   GMP_INTS_hvcinfo,
   GMP_INTS_cvcinfo,
   GMP_RALG_hvcinfo,
   GMP_RALG_cvcinfo,
   GMP_RATS_hvcinfo,
   GMP_RATS_cvcinfo,
   INTFUNC_hvcinfo,
   INTFUNC_cvcinfo,
   NULL
   };


int c_main(int argc, char* argv[])
   {
   int rv=0;
   int error_flag;
   int i;
   CU_MSGS_std_cmd_line_par_results_struct argblock;
   GMP_RALG_cf_app_struct cfdecomp;
   GMP_INTS_mpz_struct    dap_denominator, k10;

   GMP_RATS_mpq_struct rn;

   if (argc==2 && !strcmp(argv[1], "-help"))
      {
      FCMIOF_hline();
      printf("DESCRIPTION\n");
      printf("   This program calculates the continued fraction partial quotients and\n");
      printf("   convergents of a non-negative rational number.  The number may be\n");
      printf("   specified as either two integers separated by a forward slash (example:\n");
      printf("   265/39), or else as a number in scientific notation (example:  3.12e5).\n");
      printf("\n");
      printf("USAGE\n");
      printf("   cfratnum urn [options]\n");
      printf("   cfratnum -help\n");
      printf("\n");
      printf("OPTIONS\n");
      CU_MSGS_std_options(stdout, PNAME);
      FCMIOF_hline();
      CU_MSGS_toolset_info_msg(stdout, PNAME);
      FCMIOF_hline();
      }
   else if (argc < 2)
      {
      CU_MSGS_too_few_args_msg(stdout, PNAME);
      rv = 4;
      goto ret_pt;
      }
   else
      {
      //In this branch, we must have an invocation of the form
      //   cfratnum URN <options>.

      //Initialize the rational number involved.
      GMP_RATS_mpq_init(&rn);

      //Initialize the integers we use.
      GMP_INTS_mpz_init(&dap_denominator);
      GMP_INTS_mpz_init(&k10);

      //Exponentiate 10 to the power of 108.  This is
      //the default value for DAP.
      GMP_INTS_mpz_set_ui(&k10, 10);
      GMP_INTS_mpz_pow_ui(&dap_denominator, &k10, 108);

      //Try to parse the rational number involved.  There are
      //a number of formats possible, including slash-separated,
      //scientific notation, etc.  The function called will 
      //handle them all.
      GMP_RATS_mpq_set_all_format_rat_num(argv[1],
                                          &error_flag,
                                          &rn);

      //Normalize the number with respect to sign.  This will
      //be necessary so we have a cheap test for the sign.
      GMP_RATS_mpq_normalize_sign(&rn);

      //If there was a parse error or the number seems to be
      //negative, announce and abort.
      if (error_flag || GMP_INTS_mpz_is_neg(&(rn.num)))
         {
         printf("\"%s\" is not a properly formatted non-negative rational number.\n", argv[1]);
         rv = 4;
         goto ret_pt;
         }

      //We have a valid rational number.  
      //Take a peek at the command-line arguments.
      CU_MSGS_cmd_line_par_results_struct_create(&argblock);

      for (i=2; i<argc; i++)
         {
         int recognized;

         CU_MSGS_cmd_line_par_results_struct_process_arg(&argblock,
                                                         argv[i],
                                                         &recognized);
         if (!recognized)
            {
            printf("\"%s\" is not a recognized command-line parameter.\n", argv[i]);
            rv = 4;
            goto ret_pt;
            }
         else if (argblock.help)
            {
            printf("\"-help\" cannot appear in this position.\n");
            rv = 4;
            goto ret_pt;
            }
         }

      //Clean up the interpretation of the command-line arguments.
      CU_MSGS_cmd_line_par_results_struct_finalize(&argblock);

      //If we are in debug mode, we want to output the version 
      //of all of the software components making up this program,
      //except the calling .CPP file, which is trivial and 
      //could not cause a bug.  The called function will not
      //output any horizontal lines, so must handle those
      //manually.
      if (argblock.debug)
         {
         FCMIOF_hline();
         CU_MSGS_emit_vcinfo_from_ptr_table(stdout,C_MAIN_vcinfoptrs,PNAMEUC);
         }

      GMP_RALG_cfdecomp_init(&cfdecomp,
                             &error_flag,
                             &(rn.num),
                             &(rn.den));

      GMP_RALG_cfdecomp_emit(stdout, 
                             "Continued Fraction Representation", 
                             &cfdecomp, 
                             argblock.noformat, 
                             1,
                             &dap_denominator);

      GMP_RALG_cfdecomp_destroy(&cfdecomp);

      //Destroy the rational number.
      GMP_RATS_mpq_clear(&rn);

      //Deallocate the integers we use.
      GMP_INTS_mpz_clear(&dap_denominator);
      GMP_INTS_mpz_clear(&k10);

      //Destroy the block which holds information about command-line
      //arguments.
      CU_MSGS_cmd_line_par_results_struct_destroy(&argblock);
      }

   ret_pt:
   return(rv);
   }


//**************************************************************************
// $Log: c_main.c,v $
// Revision 1.5  2002/01/27 17:58:15  dtashley
// CRC32, other programs modified to work under new directory structure.
//
// Revision 1.4  2001/08/12 10:20:58  dtashley
// Safety check-in.  Substantial progress.
//
// Revision 1.3  2001/08/07 10:42:46  dtashley
// Completion of CFRATNUM extensions and DOS command-line utility.
//
// Revision 1.2  2001/07/26 03:53:17  dtashley
// Utilities that are under constructions stubbed to announce this,
// batch build file enhanced.
//
// Revision 1.1  2001/07/23 08:53:17  dtashley
// Initial check-in.
//
//**************************************************************************
// End of C_MAIN.C.