/*
 * version - determine the version of calc
 *
 * Copyright (C) 1999-2023,2026  David I. Bell and Landon Curt Noll
 *
 * See "version.h" for the actual calc version constants.
 *
 * Calc is open software; you can redistribute it and/or modify it under
 * the terms of the version 2.1 of the GNU Lesser General Public License
 * as published by the Free Software Foundation.
 *
 * Calc 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 Lesser General
 * Public License for more details.
 *
 * A copy of version 2.1 of the GNU Lesser General Public License is
 * distributed with calc under the filename COPYING-LGPL.  You should have
 * received a copy with calc; if not, write to Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Under source code control:   1990/05/22 11:00:58
 * File existed as early as:    1990
 *
 * chongo <was here> /\oo/\     http://www.isthe.com/chongo/
 * Share and enjoy!  :-)        http://www.isthe.com/chongo/tech/comp/calc/
 */

/*
 * important <system> header includes
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdint.h>
#include <stdbool.h>

/*
 * calc local src includes
 */
#include "version.h"
#if defined(CALC_VER)
#  include <unistd.h>
static char *program;
#else
#  include "value.h"
#  include "calc.h"
#endif
#include "strl.h"

#include "banned.h" /* include after all other includes */

/*
 * calc version constants
 */
int calc_major_ver = MAJOR_VER;
int calc_minor_ver = MINOR_VER;
int calc_major_patch = MAJOR_PATCH;
int calc_minor_patch = MINOR_PATCH;

/*
 * stored version
 */
static char *stored_version = NULL; /* version formed if != NULL */

/*
 * stored license info - has a side effect of copyrighting the binary
 */
char *Copyright = "\n"
                  "calc - arbitrary precision calculator\n"
                  "\n"
                  "Copyright (C) 1999-2026  David I. Bell, Landon Curt Noll "
                  "and Ernest Bowen\n"
                  "\n"
                  "Initial author:  David I. Bell\n"
                  "\n"
                  "Calc is open software; you can redistribute it and/or modify it under\n"
                  "the terms of the version 2.1 of the GNU Lesser General Public License\n"
                  "as published by the Free Software Foundation.\n"
                  "\n"
                  "Please see the file COPYING, or use the calc command:\n"
                  "\n"
                  "\thelp copying\n"
                  "\n"
                  "for important copyright and license information!\n";
char *Usability = "\n"
                  "Calc is distributed in the hope that it will be useful, but WITHOUT\n"
                  "ANY WARRANTY; without even the implied warranty of MERCHANTABILITY\n"
                  "or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General\n"
                  "Public License for more details.\n";
char *COPYING_LGPL = "\n"
                     "A copy of version 2.1 of the GNU Lesser General Public License is\n"
                     "distributed with calc under the filename COPYING-LGPL.  You should have\n"
                     "received a copy with calc; if not, write to Free Software Foundation, Inc.\n"
                     "51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.\n"
                     "\n"
                     "For license details use the command:\thelp copying\n"
                     "The COPYING-LGPL file may be viewed with:\thelp copying-lgpl\n"
                     "\n";

/*
 * version - return version string
 *
 * This function returns a malloced version string.  This version
 * string does not contain the title, just:
 *
 *              x.y.z.w
 */
char *
version(void)
{
    char verbuf[BUFSIZ + 1]; /* form version string here */
    size_t len;              /* length of version string */

    /*
     * return previously stored version if one exists
     */
    if (stored_version) {
        return stored_version;
    }

    /*
     * form the version buffer
     */
    snprintf(verbuf, BUFSIZ, "%d.%d.%d.%d", calc_major_ver, calc_minor_ver, calc_major_patch, calc_minor_patch);
    verbuf[BUFSIZ] = '\0'; /* paranoia */

    /*
     * save the versions string into a newly malloced buffer
     */
    len = strlen(verbuf);
    stored_version = (char *)calloc(len + 1, sizeof(verbuf[0]));
    if (stored_version == NULL) {
        fprintf(stderr, "%s: cannot malloc version string\n", program);
        exit(70);
    }
    strlcpy(stored_version, verbuf, len + 1);

    /*
     * return the newly malloced buffer
     */
    return stored_version;
}

#if defined(CALC_VER)

/*
 * print_3_level_version - print just the major part version string
 *
 * This function prints the major part version string:
 *
 *              x.y.z
 */
void
print_3_level_version(void)
{
    /*
     * form the version buffer
     */
    printf("%d.%d.%d\n", calc_major_ver, calc_minor_ver, calc_major_patch);
    return;
}

/*
 * version - print the calc version
 */
/*ARGSUSED*/
int
main(int argc, char *argv[])
{
    program = argv[0];
    /*
     * case: -V - print 3-level version
     */
    if (argc == 2 && strcmp(argv[1], "-V") == 0) {
        print_3_level_version();

        /*
         * case: no args - print 4-level version
         */
    } else if (argc == 1) {
        printf("%s\n", version());

        /*
         * case: -h or wrong number of args or invalid options
         */
    } else {
        fprintf(stderr,
                "usage: %s [-V | -h]\n"
                "\n"
                "    -h     print this message and exit non-zero\n"
                "    -V     print 3-level version (def: print 4-level version)\n",
                program);
        exit(75);
    }
    return 0;
}

#endif
