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

     /*
      * 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.
     *
     * $FreeBSD$
     */
    
    /*
     *      Author: David B. Golub, Carnegie Mellon University
     *      Date:   7/90
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    
    #include <ddb/ddb.h>
    #include <ddb/db_lex.h>
    #include <ddb/db_variables.h>
    
    static int      db_find_variable __P((struct db_variable **varp));
    static void     db_write_variable __P((struct db_variable *, db_expr_t *));
    
    #ifdef notused
    static int      db_set_variable __P((db_expr_t value));
    #endif
    
    static struct db_variable db_vars[] = {
            { "radix",      &db_radix, FCN_NULL },
            { "maxoff",     &db_maxoff, FCN_NULL },
            { "maxwidth",   &db_max_width, FCN_NULL },
            { "tabstops",   &db_tab_stop_width, FCN_NULL },
    };
    static struct db_variable *db_evars = 
                    db_vars + sizeof(db_vars)/sizeof(db_vars[0]);
    
    static 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);
    }
    
    #ifdef notused
    static 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);
   }
   #endif
   
   void
   db_read_variable(vp, valuep)
           struct db_variable *vp;
           db_expr_t       *valuep;
   {
           db_varfcn_t     *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;
   {
           db_varfcn_t     *func = vp->fcn;
   
           if (func == FCN_NULL)
               *(vp->valuep) = *valuep;
           else
               (*func)(vp, valuep, DB_VAR_SET);
   }
   
   void
   db_set_cmd(dummy1, dummy2, dummy3, dummy4)
           db_expr_t       dummy1;
           boolean_t       dummy2;
           db_expr_t       dummy3;
           char *          dummy4;
   {
           db_expr_t       value;
           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);
   }

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