187 lines
3.9 KiB
C
187 lines
3.9 KiB
C
/*
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* HISTORY
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* $Log: db_variables.c,v $
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* Revision 1.1 1992/03/25 21:45:33 pace
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* Initial revision
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*
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* Revision 2.3 91/02/05 17:07:19 mrt
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* Changed to new Mach copyright
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* [91/01/31 16:19:46 mrt]
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*
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* Revision 2.2 90/08/27 21:53:24 dbg
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* New db_read/write_variable functions. Should be used instead
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* of dereferencing valuep directly, which might not be a true
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* pointer if there is an fcn() access function.
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* [90/08/20 af]
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*
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* Fix declarations.
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* Check for trailing garbage after last expression on command line.
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* [90/08/10 14:34:54 dbg]
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*
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* Created.
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* [90/07/25 dbg]
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*
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*/
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/*
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* Author: David B. Golub, Carnegie Mellon University
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* Date: 7/90
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*/
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#include "param.h"
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#include "proc.h"
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#include <machine/db_machdep.h>
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#include <ddb/db_lex.h>
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#include <ddb/db_variables.h>
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extern unsigned int db_maxoff;
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extern int db_radix;
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extern int db_max_width;
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extern int db_tab_stop_width;
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struct db_variable db_vars[] = {
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{ "radix", &db_radix, FCN_NULL },
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{ "maxoff", (int *)&db_maxoff, FCN_NULL },
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{ "maxwidth", &db_max_width, FCN_NULL },
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{ "tabstops", &db_tab_stop_width, FCN_NULL },
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};
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struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]);
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int
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db_find_variable(varp)
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struct db_variable **varp;
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{
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int t;
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struct db_variable *vp;
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t = db_read_token();
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if (t == tIDENT) {
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for (vp = db_vars; vp < db_evars; vp++) {
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if (!strcmp(db_tok_string, vp->name)) {
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*varp = vp;
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return (1);
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}
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}
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for (vp = db_regs; vp < db_eregs; vp++) {
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if (!strcmp(db_tok_string, vp->name)) {
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*varp = vp;
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return (1);
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}
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}
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}
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db_error("Unknown variable\n");
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return (0);
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}
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int
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db_get_variable(valuep)
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db_expr_t *valuep;
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{
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struct db_variable *vp;
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if (!db_find_variable(&vp))
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return (0);
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db_read_variable(vp, valuep);
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return (1);
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}
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int
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db_set_variable(value)
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db_expr_t value;
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{
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struct db_variable *vp;
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if (!db_find_variable(&vp))
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return (0);
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db_write_variable(vp, &value);
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return (1);
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}
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db_read_variable(vp, valuep)
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struct db_variable *vp;
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db_expr_t *valuep;
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{
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int (*func)() = vp->fcn;
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if (func == FCN_NULL)
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*valuep = *(vp->valuep);
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else
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(*func)(vp, valuep, DB_VAR_GET);
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}
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db_write_variable(vp, valuep)
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struct db_variable *vp;
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db_expr_t *valuep;
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{
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int (*func)() = vp->fcn;
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if (func == FCN_NULL)
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*(vp->valuep) = *valuep;
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else
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(*func)(vp, valuep, DB_VAR_SET);
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}
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void
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db_set_cmd()
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{
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db_expr_t value;
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int (*func)();
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struct db_variable *vp;
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int t;
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t = db_read_token();
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if (t != tDOLLAR) {
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db_error("Unknown variable\n");
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return;
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}
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if (!db_find_variable(&vp)) {
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db_error("Unknown variable\n");
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return;
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}
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t = db_read_token();
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if (t != tEQ)
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db_unread_token(t);
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if (!db_expression(&value)) {
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db_error("No value\n");
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return;
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}
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if (db_read_token() != tEOL) {
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db_error("?\n");
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}
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db_write_variable(vp, &value);
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}
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