/*
 * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */

/*
 * Copyright (c) 2009-2014, Treehouse Networks Ltd. New Zealand
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Example URL re-writer program for Squid.
 *
 * This code gets the url and returns it. No re-writing is done.
 * It is intended for testing use and as a base for further implementation.
 */

#include "squid.h"
#include "helper/protocol_defines.h"

#include <cstring>

/**
 * options:
 * -d enable debugging.
 * -h interface help.
 */
char *my_program_name = nullptr;

static void
usage(void)
{
    fprintf(stderr,
            "Usage: %s [-d] [-v] [-h]\n"
            " -d  enable debugging.\n"
            " -h  this message\n\n",
            my_program_name);
}

static void
process_options(int argc, char *argv[])
{
    int opt, had_error = 0;

    opterr = 0;
    while (-1 != (opt = getopt(argc, argv, "hd"))) {
        switch (opt) {
        case 'd':
            debug_enabled = 1;
            break;
        case 'h':
            usage();
            exit(EXIT_SUCCESS);
        case '?':
            opt = optopt;
            [[fallthrough]];
        default:
            fprintf(stderr, "unknown option: -%c. Exiting\n", opt);
            usage();
            had_error = 1;
        }
    }
    if (had_error)
        exit(EXIT_FAILURE);
}

int
main(int argc, char *argv[])
{
    char buf[HELPER_INPUT_BUFFER];
    int buflen = 0;

    setbuf(stdout, nullptr);
    setbuf(stderr, nullptr);

    my_program_name = argv[0];

    process_options(argc, argv);

    debug("%s " VERSION " " SQUID_BUILD_INFO " starting up...\n", my_program_name);

    while (fgets(buf, HELPER_INPUT_BUFFER, stdin) != nullptr) {
        char *p;

        if ((p = strchr(buf, '\n')) != nullptr) {
            *p = '\0';      /* strip \n */
            buflen = p - buf;   /* length is known already */
        } else
            buflen = strlen(buf);   /* keep this so we only scan the buffer for \0 once per loop */

        debug("Got %d bytes '%s' from Squid\n", buflen, buf);

        p = nullptr;
        int64_t channelId = strtoll(buf, &p, 10);
        if (*p != ' ') {
            /* send 'no-change' result back to Squid in non-concurrent format */
            fprintf(stdout,"ERR\n");
        } else {
            /* send 'no-change' result back to Squid in concurrent format */
            fprintf(stdout, "%" PRId64 " ERR\n", channelId);
        }
    }
    debug("%s " VERSION " " SQUID_BUILD_INFO " shutting down...\n", my_program_name);
    return EXIT_SUCCESS;
}

