eccodes/tools/mars_request.c

/*
 * Copyright 2005-2019 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.
 */

#include <stdio.h>
#include <string.h>

#include "grib_api.h"

static void usage(const char* prog)
{
    fprintf(stderr, "%s: file\n", prog);
    exit(1);
}


int main(int argc, const char* argv[])
{
    FILE* in;
    int e;
    grib_handle* h;

    if (argc != 2)
        usage(argv[0]);

    in = fopen(argv[argc - 1], "r");
    if (!in) {
        perror(argv[argc - 1]);
        exit(1);
    }

    while ((h = grib_handle_new_from_file(NULL, in, &e)) != NULL) {
        grib_keys_iterator* i = grib_keys_iterator_new(h, GRIB_KEYS_ITERATOR_ALL_KEYS, "mars");

        while (grib_keys_iterator_next(i)) {
            char value[1024];
            size_t len = sizeof(value);
            const char* name;

            name = grib_keys_iterator_get_name(i);
            GRIB_CHECK(grib_get_string(h, name, value, &len), 0);

            printf("%s = %s\n", name, value);
        }

        grib_keys_iterator_delete(i);
        grib_handle_delete(h);
    }

    GRIB_CHECK(e, argv[argc - 1]);

    return 0;
}