/*      $OpenBSD: db_variables.c,v 1.22 2023/03/08 04:43:07 guenther Exp $      */
/*      $NetBSD: db_variables.c,v 1.8 1996/02/05 01:57:19 christos Exp $        */

/*
 * Mach Operating System
 * Copyright (c) 1993,1992,1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */

#include <sys/param.h>
#include <sys/systm.h>

#include <machine/db_machdep.h>

#include <ddb/db_lex.h>
#include <ddb/db_variables.h>
#include <ddb/db_command.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
#include <ddb/db_var.h>

struct db_variable db_vars[] = {
        { "radix",      (long *)&db_radix, db_var_rw_int },
        { "maxoff",     (long *)&db_maxoff, db_var_rw_int },
        { "maxwidth",   (long *)&db_max_width, db_var_rw_int },
        { "tabstops",   (long *)&db_tab_stop_width, db_var_rw_int },
        { "lines",      (long *)&db_max_line, db_var_rw_int },
        { "log",        (long *)&db_log, db_var_rw_int }
};
struct db_variable *db_evars = db_vars + nitems(db_vars);

int
db_find_variable(struct db_variable **varp)
{
        int     t;
        struct db_variable *vp;

        t = db_read_token();
        if (t == tIDENT) {
                for (vp = db_vars; vp < db_evars; vp++) {
                        if (!strcmp(db_tok_string, vp->name)) {
                                *varp = vp;
                                return (1);
                        }
                }
                for (vp = db_regs; vp < db_eregs; vp++) {
                        if (!strcmp(db_tok_string, vp->name)) {
                                *varp = vp;
                                return (1);
                        }
                }
        }
        db_error("Unknown variable\n");
        /*NOTREACHED*/
        return 0;
}

int
db_get_variable(db_expr_t *valuep)
{
        struct db_variable *vp;

        if (!db_find_variable(&vp))
                return (0);

        db_read_variable(vp, valuep);

        return (1);
}

int
db_set_variable(db_expr_t value)
{
        struct db_variable *vp;

        if (!db_find_variable(&vp))
                return (0);

        db_write_variable(vp, &value);

        return (1);
}


void
db_read_variable(struct db_variable *vp, db_expr_t *valuep)
{
        int     (*func)(struct db_variable *, db_expr_t *, int) = vp->fcn;

        if (func == FCN_NULL)
                *valuep = *(vp->valuep);
        else
                (*func)(vp, valuep, DB_VAR_GET);
}

void
db_write_variable(struct db_variable *vp, db_expr_t *valuep)
{
        int     (*func)(struct db_variable *, db_expr_t *, int) = vp->fcn;

        if (func == FCN_NULL)
                *(vp->valuep) = *valuep;
        else
                (*func)(vp, valuep, DB_VAR_SET);
}

void
db_set_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
        db_expr_t       value;
        struct db_variable *vp;
        int     t;

        t = db_read_token();
        if (t != tDOLLAR) {
                db_error("Unknown variable\n");
                /*NOTREACHED*/
        }
        if (!db_find_variable(&vp)) {
                db_error("Unknown variable\n");
                /*NOTREACHED*/
        }

        t = db_read_token();
        if (t != tEQ)
                db_unread_token(t);

        if (!db_expression(&value)) {
                db_error("No value\n");
                /*NOTREACHED*/
        }
        if (db_read_token() != tEOL) {
                db_error("?\n");
                /*NOTREACHED*/
        }

        db_write_variable(vp, &value);
}

int
db_var_rw_int(struct db_variable *var, db_expr_t *expr, int mode)
{

        if (mode == DB_VAR_SET)
                *(int *)var->valuep = *expr;
        else
                *expr = *(int *)var->valuep;
        return (0);
}