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First phase of REUSE compliance and header reformat

/*
 *
 *   $Log: cmd_if.c,v $
 *   Revision 1.3  2025/03/09 19:14:24  snw
 *   First phase of REUSE compliance and header reformat
 *
 *    Implementation of the IF command
 *
 *  
 *   Author: Serena Willis <snw@coherent-logic.com>
 *    Copyright (C) 1998 MUG Deutschland
 *    Copyright (C) 2023, 2025 Coherent Logic Development LLC
 *
 *
 *   This file is part of FreeM.
 *
 *   FreeM is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Affero Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   FreeM 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 Affero Public License for more details.
 *
 *   You should have received a copy of the GNU Affero Public License
 *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
 *
 *   $Log: cmd_if.c,v $
 *   Revision 1.3  2025/03/09 19:14:24  snw
 *   First phase of REUSE compliance and header reformat
 *
 *
 * SPDX-FileCopyrightText:  (C) 2025 Coherent Logic Development LLC
 * SPDX-License-Identifier: AGPL-3.0-or-later
 **/

#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "mpsdef.h"
#include "mcommand.h"

MRESULT cmd_if(MACTION *ra)
{
    if (*codptr == SP || *codptr == EOL) {           /* no argument form of IF */
        if (test) {
            *ra = RA_NEXTCMND;
            return OK;
        }
        *ra = RA_SKIPLINE;
        return OK;
    }
    
    expr (STRING);
    
    if (*argptr == '1') {
        test = TRUE;
        *ra = RA_CONTINUE;
        return OK;
    }
    
    if (merr ()) return merr ();
    
    if (*argptr == '0' && argptr[1] == EOL) {
        test = FALSE;
        *ra = RA_SKIPLINE;
        return OK;
    }
    
    if ((test = tvexpr (argptr)) == FALSE) {
        *ra = RA_SKIPLINE;
        return OK;
    }

    *ra = RA_CONTINUE;
    return OK;    
}