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/* $OpenBSD: db_variables.c,v 1.21 2020/10/15 03:14:00 deraadt 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);
}
/*ARGSUSED*/
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);
}
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