text: /*
   * (C) Copyright 2005- ECMWF.
   *
   * This software is licensed under the terms of the Apache Licence Version 2.0
   * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
   *
   * In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
   * virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
   */
  
  /*
   * C Implementation: grib_set_data
   *
   * Description: set the data contained in a GRIB file.
   *              In this example no missing values are present
   *              If there are missing values, refer to: grib_set_bitmap
   *
   */
  #include <stdio.h>
  #include <stdlib.h>
  
  #include "eccodes.h"
  
  static void usage(const char* prog)
  {
      printf("usage: %s out.grib\n", prog);
      exit(1);
  }
  
  int main(int argc, char** argv)
  {
      int i;
      double* values    = NULL;
      size_t values_len = 0;
  
      /* Note: the full name of the sample file is "regular_ll_pl_grib1.tmpl" */
      /* Sample files are stored in the samples directory (use codes_info to  */
      /* see where that is).  The default sample path can be changed by       */
      /* setting the environment variable ECCODES_SAMPLES_PATH                */
      const char* sample_filename = "regular_ll_pl_grib1";
  
      /* here is how you can get the samples path */
      const char* samples_path = codes_samples_path(NULL);
      codes_handle* h          = NULL;
      double d, e;
      long count;
  
      if (argc != 2) usage(argv[0]);
      /* create new handle from message in sample file */
      printf("Using samples path: %s\n", samples_path);
      h = codes_grib_handle_new_from_samples(0, sample_filename);
      if (h == NULL) {
          fprintf(stderr, "Error: unable to create handle from sample file %s\n", sample_filename);
          return 1;
      }
  
      /* here we're changing the data values only, so the number of values */
      /* will be the same as the sample GRIB. */
      /* But if your data array has a different size, then specify the grid geometry */
      /* (e.g. keys Ni, Nj etc) and set the correct number of data values */
      CODES_CHECK(codes_get_size(h, "values", &values_len), 0);
  
      values = (double*)malloc(values_len * sizeof(double));
      d      = 10e-8;
      e      = d;
      count  = 1;
      for (i = 0; i < values_len; i++) {
          if (count > 100) {
              e *= 10;
              count = 1;
          }
          values[i] = d;
          /*printf("%g \n",values[i]);*/
          d += e;
          count++;
      }
  
      CODES_CHECK(codes_set_long(h, "bitsPerValue", 16), 0);
  
      /* set data values */
      CODES_CHECK(codes_set_double_array(h, "values", values, values_len), 0);
  
      CODES_CHECK(codes_write_message(h, argv[1], "w"), 0);
  
      free(values);
      codes_handle_delete(h);
  
      return 0;
  }
  