day2doy.c

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/*
  This file is part of JURASSIC.
  
  JURASSIC 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.
  
  JURASSIC 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 JURASSIC. If not, see <http://www.gnu.org/licenses/>.
  
  Copyright (C) 2003-2026 Forschungszentrum Juelich GmbH
*/
 
#include "jurassic.h"
 
/* ------------------------------------------------------------
   Functions...
   ------------------------------------------------------------ */
 
static void usage(
  void);
 
/* ------------------------------------------------------------
   Main...
   ------------------------------------------------------------ */
 
int main(
  int argc,
  char *argv[]) {
 
  int doy;
 
  /* Print usage information... */
  USAGE;
 
  /* Check arguments... */
  if (argc < 4)
    ERRMSG("Missing or invalid command-line arguments.\n\n"
           "Usage: day2doy <year> <mon> <day>\n\n" "Use -h for full help.");
 
  /* Read arguments... */
  const int year = atoi(argv[1]);
  const int mon = atoi(argv[2]);
  const int day = atoi(argv[3]);
 
  /* Convert... */
  day2doy(year, mon, day, &doy);
  printf("%d %d\n", year, doy);
 
  return EXIT_SUCCESS;
}
 
/*****************************************************************************/
 
static void usage(
  void) {
  printf("\nJURASSIC calendar converter.\n\n");
  printf("Convert a calendar date to year and day-of-year.\n\n");
  printf("Usage:\n");
  printf("  day2doy <year> <mon> <day>\n\n");
  printf("Arguments:\n");
  printf("  <year>  Calendar year.\n");
  printf("  <mon>   Calendar month.\n");
  printf("  <day>   Day of month.\n\n");
  printf("Output:\n");
  printf("  Writes results to standard output.\n\n");
  printf("Further information:\n");
  printf("  Manual: https://slcs-jsc.github.io/jurassic/\n");
}