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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 "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.
*/
/*
* Author: David B. Golub, Carnegie Mellon University
* Date: 7/90
*/
#if MACH_KDB
#include <machine/db_machdep.h>
#include <ddb/db_command.h>
#include <ddb/db_examine.h>
#include <ddb/db_expr.h>
#include <ddb/db_lex.h>
#include <ddb/db_output.h>
#include <ddb/db_variables.h>
#include <ddb/db_task_thread.h>
#include <ddb/db_macro.h>
extern unsigned long db_maxoff;
extern db_expr_t db_radix;
extern db_expr_t db_max_width;
extern db_expr_t db_tab_stop_width;
extern db_expr_t db_max_line;
#define DB_NWORK 32 /* number of work variable */
db_expr_t db_work[DB_NWORK]; /* work variable */
struct db_variable db_vars[] = {
{ "radix", &db_radix, FCN_NULL },
{ "maxoff", (db_expr_t*)&db_maxoff, FCN_NULL },
{ "maxwidth", &db_max_width, FCN_NULL },
{ "tabstops", &db_tab_stop_width, FCN_NULL },
{ "lines", &db_max_line, FCN_NULL },
{ "thread", 0, db_set_default_thread },
{ "task", 0, db_get_task_thread,
1, 2, -1, -1 },
{ "map", 0, db_get_map,
1, 1, -1, -1 },
{ "work", &db_work[0], FCN_NULL,
1, 1, 0, DB_NWORK-1 },
{ "arg", 0, db_arg_variable,
1, 1, -1, -1 },
};
struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]);
const char *
db_get_suffix(suffix, suffix_value)
const char *suffix;
short *suffix_value;
{
int value;
for (value = 0; *suffix && *suffix != '.' && *suffix != ':'; suffix++) {
if (*suffix < '0' || *suffix > '9')
return(0);
value = value*10 + *suffix - '0';
}
*suffix_value = value;
if (*suffix == '.')
suffix++;
return(suffix);
}
static boolean_t
db_cmp_variable_name(vp, name, ap)
struct db_variable *vp;
char *name;
const db_var_aux_param_t ap;
{
char *var_np;
const char *np;
int level;
for (np = name, var_np = vp->name; *var_np; ) {
if (*np++ != *var_np++)
return(FALSE);
}
for (level = 0; *np && *np != ':' && level < vp->max_level; level++){
if ((np = db_get_suffix(np, &ap->suffix[level])) == 0)
return(FALSE);
}
if ((*np && *np != ':') || level < vp->min_level
|| (level > 0 && (ap->suffix[0] < vp->low
|| (vp->high >= 0 && ap->suffix[0] > vp->high))))
return(FALSE);
db_strcpy(ap->modif, (*np)? np+1: "");
ap->thread = (db_option(ap->modif, 't')?db_default_thread: THREAD_NULL);
ap->level = level;
return(TRUE);
}
int
db_find_variable(
struct db_variable **varp,
db_var_aux_param_t ap)
{
int t;
struct db_variable *vp;
t = db_read_token();
if (t == tIDENT) {
for (vp = db_vars; vp < db_evars; vp++) {
if (db_cmp_variable_name(vp, db_tok_string, ap)) {
*varp = vp;
return (1);
}
}
for (vp = db_regs; vp < db_eregs; vp++) {
if (db_cmp_variable_name(vp, db_tok_string, ap)) {
*varp = vp;
return (1);
}
}
}
db_printf("Unknown variable \"$%s\"\n", db_tok_string);
db_error(0);
return (0);
}
int
db_get_variable(db_expr_t *valuep)
{
struct db_variable *vp;
struct db_var_aux_param aux_param;
char modif[TOK_STRING_SIZE];
aux_param.modif = modif;
if (!db_find_variable(&vp, &aux_param))
return (0);
db_read_write_variable(vp, valuep, DB_VAR_GET, &aux_param);
return (1);
}
int
db_set_variable(db_expr_t value)
{
struct db_variable *vp;
struct db_var_aux_param aux_param;
char modif[TOK_STRING_SIZE];
aux_param.modif = modif;
if (!db_find_variable(&vp, &aux_param))
return (0);
db_read_write_variable(vp, &value, DB_VAR_SET, &aux_param);
return (1);
}
void
db_read_write_variable(
struct db_variable *vp,
db_expr_t *valuep,
int rw_flag,
db_var_aux_param_t ap)
{
void (*func)() = vp->fcn;
struct db_var_aux_param aux_param;
if (ap == 0) {
ap = &aux_param;
ap->modif = "";
ap->level = 0;
ap->thread = THREAD_NULL;
}
if (func == FCN_NULL) {
if (rw_flag == DB_VAR_SET)
vp->valuep[(ap->level)? (ap->suffix[0] - vp->low): 0] = *valuep;
else
*valuep = vp->valuep[(ap->level)? (ap->suffix[0] - vp->low): 0];
} else
(*func)(vp, valuep, rw_flag, ap);
}
void
db_set_cmd(void)
{
db_expr_t value;
int t;
struct db_variable *vp;
struct db_var_aux_param aux_param;
char modif[TOK_STRING_SIZE];
aux_param.modif = modif;
t = db_read_token();
if (t != tDOLLAR) {
db_error("Variable name should be prefixed with $\n");
return;
}
if (!db_find_variable(&vp, &aux_param)) {
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 ((t = db_read_token()) == tSEMI_COLON)
db_unread_token(t);
else if (t != tEOL)
db_error("?\n");
db_read_write_variable(vp, &value, DB_VAR_SET, &aux_param);
}
#endif /* MACH_KDB */
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