// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: getopt
 *
 * Copyright (C) 2000 - 2025, Intel Corp.
 *
 *****************************************************************************/

/*
 * ACPICA getopt() implementation
 *
 * Option strings:
 *    "f"       - Option has no arguments
 *    "f:"      - Option requires an argument
 *    "f+"      - Option has an optional argument
 *    "f^"      - Option has optional single-char sub-options
 *    "f|"      - Option has required single-char sub-options
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acapps.h"

#define ACPI_OPTION_ERROR(msg, badchar) \
        if (acpi_gbl_opterr) {fprintf (stderr, "%s%c\n", msg, badchar);}

int acpi_gbl_opterr = 1;
int acpi_gbl_optind = 1;
int acpi_gbl_sub_opt_char = 0;
char *acpi_gbl_optarg;

static int current_char_ptr = 1;

/*******************************************************************************
 *
 * FUNCTION:    acpi_getopt_argument
 *
 * PARAMETERS:  argc, argv          - from main
 *
 * RETURN:      0 if an argument was found, -1 otherwise. Sets acpi_gbl_Optarg
 *              to point to the next argument.
 *
 * DESCRIPTION: Get the next argument. Used to obtain arguments for the
 *              two-character options after the original call to acpi_getopt.
 *              Note: Either the argument starts at the next character after
 *              the option, or it is pointed to by the next argv entry.
 *              (After call to acpi_getopt, we need to backup to the previous
 *              argv entry).
 *
 ******************************************************************************/

int acpi_getopt_argument(int argc, char **argv)
{

        acpi_gbl_optind--;
        current_char_ptr++;

        if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
                acpi_gbl_optarg =
                    &argv[acpi_gbl_optind++][(int)(current_char_ptr + 1)];
        } else if (++acpi_gbl_optind >= argc) {
                ACPI_OPTION_ERROR("\nOption requires an argument", 0);

                current_char_ptr = 1;
                return (-1);
        } else {
                acpi_gbl_optarg = argv[acpi_gbl_optind++];
        }

        current_char_ptr = 1;
        return (0);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_getopt
 *
 * PARAMETERS:  argc, argv          - from main
 *              opts                - options info list
 *
 * RETURN:      Option character or ACPI_OPT_END
 *
 * DESCRIPTION: Get the next option
 *
 ******************************************************************************/

int acpi_getopt(int argc, char **argv, char *opts)
{
        int current_char;
        char *opts_ptr;

        if (current_char_ptr == 1) {
                if (acpi_gbl_optind >= argc ||
                    argv[acpi_gbl_optind][0] != '-' ||
                    argv[acpi_gbl_optind][1] == '\0') {
                        return (ACPI_OPT_END);
                } else if (strcmp(argv[acpi_gbl_optind], "--") == 0) {
                        acpi_gbl_optind++;
                        return (ACPI_OPT_END);
                }
        }

        /* Get the option */

        current_char = argv[acpi_gbl_optind][current_char_ptr];

        /* Make sure that the option is legal */

        if (current_char == ':' ||
            (opts_ptr = strchr(opts, current_char)) == NULL) {
                ACPI_OPTION_ERROR("Illegal option: -", current_char);

                if (argv[acpi_gbl_optind][++current_char_ptr] == '\0') {
                        acpi_gbl_optind++;
                        current_char_ptr = 1;
                }

                return ('?');
        }

        /* Option requires an argument? */

        if (*++opts_ptr == ':') {
                if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
                        acpi_gbl_optarg =
                            &argv[acpi_gbl_optind++][(int)
                                                     (current_char_ptr + 1)];
                } else if (++acpi_gbl_optind >= argc) {
                        ACPI_OPTION_ERROR("Option requires an argument: -",
                                          current_char);

                        current_char_ptr = 1;
                        return ('?');
                } else {
                        acpi_gbl_optarg = argv[acpi_gbl_optind++];
                }

                current_char_ptr = 1;
        }

        /* Option has an optional argument? */

        else if (*opts_ptr == '+') {
                if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
                        acpi_gbl_optarg =
                            &argv[acpi_gbl_optind++][(int)
                                                     (current_char_ptr + 1)];
                } else if (++acpi_gbl_optind >= argc) {
                        acpi_gbl_optarg = NULL;
                } else {
                        acpi_gbl_optarg = argv[acpi_gbl_optind++];
                }

                current_char_ptr = 1;
        }

        /* Option has optional single-char arguments? */

        else if (*opts_ptr == '^') {
                if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
                        acpi_gbl_optarg =
                            &argv[acpi_gbl_optind][(int)(current_char_ptr + 1)];
                } else {
                        acpi_gbl_optarg = "^";
                }

                acpi_gbl_sub_opt_char = acpi_gbl_optarg[0];
                acpi_gbl_optind++;
                current_char_ptr = 1;
        }

        /* Option has a required single-char argument? */

        else if (*opts_ptr == '|') {
                if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
                        acpi_gbl_optarg =
                            &argv[acpi_gbl_optind][(int)(current_char_ptr + 1)];
                } else {
                        ACPI_OPTION_ERROR
                            ("Option requires a single-character suboption: -",
                             current_char);

                        current_char_ptr = 1;
                        return ('?');
                }

                acpi_gbl_sub_opt_char = acpi_gbl_optarg[0];
                acpi_gbl_optind++;
                current_char_ptr = 1;
        }

        /* Option with no arguments */

        else {
                if (argv[acpi_gbl_optind][++current_char_ptr] == '\0') {
                        current_char_ptr = 1;
                        acpi_gbl_optind++;
                }

                acpi_gbl_optarg = NULL;
        }

        return (current_char);
}