text: /*
   * Copyright 2016-2018 Uber Technologies, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *         http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /** @file
   * @brief tests H3 function `geoToH3`
   *
   *  usage: `testGeoToH3`
   *
   *  The program reads lines containing H3 indexes and lat/lon  pairs from
   *  stdin until EOF is encountered. For each input line, it calls `geoToH3`
   *  to convert the input lat/lon to an H3 index, and then validates the
   *  index against the original input index.
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include "geoCoord.h"
  #include "h3Index.h"
  #include "test.h"
  #include "utility.h"
  
  static void assertExpected(H3Index h1, const GeoCoord* g1) {
      // convert lat/lon to H3 and verify
      int res = H3_EXPORT(h3GetResolution)(h1);
      H3Index h2 = H3_EXPORT(geoToH3)(g1, res);
      t_assert(h1 == h2, "got expected geoToH3 output");
  }
  
  int main(int argc, char* argv[]) {
      // check command line args
      if (argc > 1) {
          fprintf(stderr, "usage: %s\n", argv[0]);
          exit(1);
      }
  
      // process the indexes and lat/lons on stdin
      char buff[BUFF_SIZE];
      char h3Str[BUFF_SIZE];
      while (1) {
          // get an index from stdin
          if (!fgets(buff, BUFF_SIZE, stdin)) {
              if (feof(stdin))
                  break;
              else
                  error("reading input from stdin");
          }
  
          double latDegs, lonDegs;
          if (sscanf(buff, "%s %lf %lf", h3Str, &latDegs, &lonDegs) != 3)
              error("parsing input (should be \"H3Index lat lon\")");
  
          H3Index h3;
          h3 = H3_EXPORT(stringToH3)(h3Str);
  
          GeoCoord coord;
          setGeoDegs(&coord, latDegs, lonDegs);
  
          assertExpected(h3, &coord);
      }
  }
  