/* * 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. * * $Id: db_variables.c,v 1.2 1993/10/16 16:47:29 rgrimes Exp $ */ /* * Author: David B. Golub, Carnegie Mellon University * Date: 7/90 */ #include "param.h" #include "systm.h" #include "proc.h" #include "ddb/ddb.h" #include <ddb/db_lex.h> #include <ddb/db_variables.h> void db_read_variable(struct db_variable *, db_expr_t *); static void db_write_variable(struct db_variable *, db_expr_t *); 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); } void 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); } static void 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 dummy1, int dummy2, db_expr_t dummy3, char *dummy4) { 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); }