FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_variables.c

     /*      $OpenBSD: db_variables.c,v 1.21 2020/10/15 03:14:00 deraadt Exp $       */
     /*      $NetBSD: db_variables.c,v 1.8 1996/02/05 01:57:19 christos Exp $        */
     
     /*
      * Mach Operating System
      * Copyright (c) 1993,1992,1991,1990 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.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    
    #include <machine/db_machdep.h>
    
    #include <ddb/db_lex.h>
    #include <ddb/db_variables.h>
    #include <ddb/db_command.h>
    #include <ddb/db_sym.h>
    #include <ddb/db_extern.h>
    #include <ddb/db_var.h>
    
    struct db_variable db_vars[] = {
            { "radix",      (long *)&db_radix, db_var_rw_int },
            { "maxoff",     (long *)&db_maxoff, db_var_rw_int },
            { "maxwidth",   (long *)&db_max_width, db_var_rw_int },
            { "tabstops",   (long *)&db_tab_stop_width, db_var_rw_int },
            { "lines",      (long *)&db_max_line, db_var_rw_int },
            { "log",        (long *)&db_log, db_var_rw_int }
    };
    struct db_variable *db_evars = db_vars + nitems(db_vars);
    
    int
    db_find_variable(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");
            /*NOTREACHED*/
            return 0;
    }
    
    int
    db_get_variable(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(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(struct db_variable *vp, db_expr_t *valuep)
   {
           int     (*func)(struct db_variable *, db_expr_t *, int) = vp->fcn;
   
           if (func == FCN_NULL)
                   *valuep = *(vp->valuep);
           else
                   (*func)(vp, valuep, DB_VAR_GET);
   }
   
   void
   db_write_variable(struct db_variable *vp, db_expr_t *valuep)
   {
           int     (*func)(struct db_variable *, db_expr_t *, int) = vp->fcn;
   
           if (func == FCN_NULL)
                   *(vp->valuep) = *valuep;
           else
                   (*func)(vp, valuep, DB_VAR_SET);
   }
   
   /*ARGSUSED*/
   void
   db_set_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
   {
           db_expr_t       value;
           struct db_variable *vp;
           int     t;
   
           t = db_read_token();
           if (t != tDOLLAR) {
                   db_error("Unknown variable\n");
                   /*NOTREACHED*/
           }
           if (!db_find_variable(&vp)) {
                   db_error("Unknown variable\n");
                   /*NOTREACHED*/
           }
   
           t = db_read_token();
           if (t != tEQ)
                   db_unread_token(t);
   
           if (!db_expression(&value)) {
                   db_error("No value\n");
                   /*NOTREACHED*/
           }
           if (db_read_token() != tEOL) {
                   db_error("?\n");
                   /*NOTREACHED*/
           }
   
           db_write_variable(vp, &value);
   }
   
   int
   db_var_rw_int(struct db_variable *var, db_expr_t *expr, int mode)
   {
   
           if (mode == DB_VAR_SET)
                   *(int *)var->valuep = *expr;
           else
                   *expr = *(int *)var->valuep;
           return (0);
   }

Cache object: 981e5e9bee7f908da2ebdb3839e98cfe