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Annotation of freem/src/cmd_const.c, revision 1.3

1.1       snw         1: /*
                      2:  *
1.3     ! snw         3:  *   $Id$
1.1       snw         4:  *    Implementation of the CONST command
                      5:  *
                      6:  *  
1.2       snw         7:  *   Author: Serena Willis <snw@coherent-logic.com>
1.1       snw         8:  *    Copyright (C) 1998 MUG Deutschland
                      9:  *    Copyright (C) 2023 Coherent Logic Development LLC
                     10:  *
                     11:  *
                     12:  *   This file is part of FreeM.
                     13:  *
                     14:  *   FreeM is free software: you can redistribute it and/or modify
                     15:  *   it under the terms of the GNU Affero Public License as published by
                     16:  *   the Free Software Foundation, either version 3 of the License, or
                     17:  *   (at your option) any later version.
                     18:  *
                     19:  *   FreeM is distributed in the hope that it will be useful,
                     20:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
                     21:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     22:  *   GNU Affero Public License for more details.
                     23:  *
                     24:  *   You should have received a copy of the GNU Affero Public License
                     25:  *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
                     26:  *
1.3     ! snw        27:  *   $Log$
        !            28:  *
        !            29:  * SPDX-FileCopyrightText:  (C) 2025 Coherent Logic Development LLC
        !            30:  * SPDX-License-Identifier: AGPL-3.0-or-later
1.1       snw        31:  **/
                     32: 
                     33: #include <string.h>
                     34: #include <stdlib.h>
                     35: #include "mpsdef.h"
                     36: #include "mcommand.h"
                     37: #include "consttbl.h"
                     38: 
                     39: MRESULT cmd_const(MACTION *ra)
                     40: {
                     41:     char an[255];
                     42:     char vn[255];
                     43:     register char ch;
                     44:     
                     45:     if (rtn_dialect () != D_FREEM) {
                     46:         return NOSTAND;
                     47:     }
                     48:     
                     49:     /* argumentless is not supported */
                     50:     if (((ch = *codptr) == SP) || ch == EOL) {
                     51:         return ARGLIST;
                     52:     }
                     53:     
                     54:     for (;;) {
                     55:         
                     56:         /* grab an mname */
                     57:         expr (NAME);
                     58:         if (merr ()) return merr();
                     59:         
                     60:         stcpy (vn, varnam);
                     61:         
                     62:         /* CONSTs cannot be globals or SSVNs */
                     63:         if (vn[0] == '^') {
                     64:             return GLOBER;
                     65:         }
                     66:         
                     67:         /* move to next position */
                     68:         codptr++;             
                     69:         
                     70:         /* must initialize CONSTs */
                     71:         if (*codptr != '=') {              
                     72:             return ASSIGNER;
                     73:         }
                     74:         
                     75:         /* move past = sign */
                     76:         codptr++;
                     77:         
                     78:         /* grab initialization value */
                     79:         expr (STRING);         
                     80:         if (merr ()) return merr();
                     81:         
                     82:         /* at this point, the constant name is in vn
                     83:            and the initializer in argptr */
                     84:         if (const_is_defined (vn)) {
                     85:             return CREDEF;
                     86:         }
                     87:         
                     88:         stcpy (an, argptr);
                     89:         symtab (set_sym, vn, an);
                     90:         const_define (vn, an);         
                     91:        
                     92:         /* TODO: call into const-init code */
                     93:         
                     94:         if ((ch = *(codptr + 1)) == EOL || ch == SP) {
                     95:             codptr++;
                     96:             break;
                     97:         }
                     98:         else if (*codptr == ',') {
                     99:             codptr++;
                    100:         }
                    101:         else {
                    102:             return CMMND;
                    103:         }
                    104:         
                    105:     }
                    106: 
                    107:     *ra = RA_CONTINUE;
                    108:     return OK;
                    109: }