154 lines
3.3 KiB
C
154 lines
3.3 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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* Author: David B. Golub, Carnegie Mellon University
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* Date: 7/90
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <ddb/ddb.h>
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#include <ddb/db_lex.h>
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#include <ddb/db_variables.h>
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static int db_find_variable(struct db_variable **varp);
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static struct db_variable db_vars[] = {
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{ "radix", &db_radix, FCN_NULL },
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{ "maxoff", &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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{ "lines", &db_lines_per_page, FCN_NULL },
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};
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static struct db_variable *db_evars =
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db_vars + sizeof(db_vars)/sizeof(db_vars[0]);
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static int
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db_find_variable(struct db_variable **varp)
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{
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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 == 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(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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return (db_read_variable(vp, valuep));
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}
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int
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db_set_variable(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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return (db_write_variable(vp, value));
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}
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int
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db_read_variable(struct db_variable *vp, db_expr_t *valuep)
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{
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db_varfcn_t *func = vp->fcn;
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if (func == FCN_NULL) {
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*valuep = *(vp->valuep);
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return (1);
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}
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return ((*func)(vp, valuep, DB_VAR_GET));
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}
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int
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db_write_variable(struct db_variable *vp, db_expr_t value)
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{
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db_varfcn_t *func = vp->fcn;
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if (func == FCN_NULL) {
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*(vp->valuep) = value;
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return (1);
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}
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return ((*func)(vp, &value, DB_VAR_SET));
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}
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void
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db_set_cmd(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
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{
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struct db_variable *vp;
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db_expr_t value;
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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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db_write_variable(vp, value);
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}
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