/*

   igraph library.

   Copyright (C) 2022-2024  The igraph development team

   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 2 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, write to the Free Software

   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

   02110-1301 USA

*/

#include <igraph.h>

#include <cstdio>

extern "C"

int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {

    igraph_set_error_handler(igraph_error_handler_ignore);

    igraph_set_warning_handler(igraph_warning_handler_ignore);

    // Read input file

    FILE *ifile = fmemopen((void*) data, size, "r");

    if (!ifile) {

        return 0;

    }

    // Do the fuzzing

    igraph_t g;

    if (igraph_read_graph_edgelist(&g, ifile, 0, IGRAPH_UNDIRECTED) == IGRAPH_SUCCESS) {

        FILE *ofile = fopen("/dev/null", "w");

        if (ofile) {

            igraph_write_graph_edgelist(&g, ofile);

            fclose(ofile);

        }

        // Clean up

        igraph_destroy(&g);

    }

    // no need to call igraph_destroy() if igraph_read_graph_edgelist() returns an

    // error code as we don't have a valid graph object in that case

    fclose(ifile);

    IGRAPH_ASSERT(IGRAPH_FINALLY_STACK_EMPTY);

    return 0;

}