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/*
* Mach Operating System
* Copyright (c) 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
* 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 the
* rights to redistribute these changes.
*/
/*
* HISTORY
* $Log: db_variables.c,v $
* Revision 1.1 1992/03/25 21:45:33 pace
* Initial revision
*
* Revision 2.3 91/02/05 17:07:19 mrt
* Changed to new Mach copyright
* [91/01/31 16:19:46 mrt]
*
* Revision 2.2 90/08/27 21:53:24 dbg
* New db_read/write_variable functions. Should be used instead
* of dereferencing valuep directly, which might not be a true
* pointer if there is an fcn() access function.
* [90/08/20 af]
*
* Fix declarations.
* Check for trailing garbage after last expression on command line.
* [90/08/10 14:34:54 dbg]
*
* Created.
* [90/07/25 dbg]
*
*/
/*
* Author: David B. Golub, Carnegie Mellon University
* Date: 7/90
*/
#include "param.h"
#include "proc.h"
#include <machine/db_machdep.h>
#include <ddb/db_lex.h>
#include <ddb/db_variables.h>
extern unsigned int db_maxoff;
extern int db_radix;
extern int db_max_width;
extern int db_tab_stop_width;
struct db_variable db_vars[] = {
{ "radix", &db_radix, FCN_NULL },
{ "maxoff", (int *)&db_maxoff, FCN_NULL },
{ "maxwidth", &db_max_width, FCN_NULL },
{ "tabstops", &db_tab_stop_width, FCN_NULL },
};
struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]);
int
db_find_variable(varp)
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");
return (0);
}
int
db_get_variable(valuep)
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(value)
db_expr_t value;
{
struct db_variable *vp;
if (!db_find_variable(&vp))
return (0);
db_write_variable(vp, &value);
return (1);
}
db_read_variable(vp, valuep)
struct db_variable *vp;
db_expr_t *valuep;
{
int (*func)() = vp->fcn;
if (func == FCN_NULL)
*valuep = *(vp->valuep);
else
(*func)(vp, valuep, DB_VAR_GET);
}
db_write_variable(vp, valuep)
struct db_variable *vp;
db_expr_t *valuep;
{
int (*func)() = vp->fcn;
if (func == FCN_NULL)
*(vp->valuep) = *valuep;
else
(*func)(vp, valuep, DB_VAR_SET);
}
void
db_set_cmd()
{
db_expr_t value;
int (*func)();
struct db_variable *vp;
int t;
t = db_read_token();
if (t != tDOLLAR) {
db_error("Unknown variable\n");
return;
}
if (!db_find_variable(&vp)) {
db_error("Unknown variable\n");
return;
}
t = db_read_token();
if (t != tEQ)
db_unread_token(t);
if (!db_expression(&value)) {
db_error("No value\n");
return;
}
if (db_read_token() != tEOL) {
db_error("?\n");
}
db_write_variable(vp, &value);
}
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