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

     /*-
      * SPDX-License-Identifier: MIT-CMU
      *
      * 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.
     */
    /*
     *      Author: David B. Golub, Carnegie Mellon University
     *      Date:   7/90
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #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(struct db_variable **varp);
    
    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 },
            { "lines",      &db_lines_per_page, FCN_NULL },
            { "curcpu",     NULL, db_var_curcpu },
            { "db_cpu",     NULL, db_var_db_cpu },
    #ifdef VIMAGE
            { "curvnet",    NULL, db_var_curvnet },
            { "db_vnet",    NULL, db_var_db_vnet },
    #endif
    };
    static struct db_variable *db_evars = db_vars + nitems(db_vars);
    
    static int
    db_find_variable(struct db_variable **varp)
    {
            struct db_variable *vp;
            int t;
    
            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(db_expr_t *valuep)
    {
            struct db_variable *vp;
    
            if (!db_find_variable(&vp))
                    return (0);
    
            return (db_read_variable(vp, valuep));
    }
    
    int
    db_set_variable(db_expr_t value)
    {
            struct db_variable *vp;
   
           if (!db_find_variable(&vp))
                   return (0);
   
           return (db_write_variable(vp, value));
   }
   
   int
   db_read_variable(struct db_variable *vp, db_expr_t *valuep)
   {
           db_varfcn_t *func = vp->fcn;
   
           if (func == FCN_NULL) {
                   *valuep = *(vp->valuep);
                   return (1);
           }
           return ((*func)(vp, valuep, DB_VAR_GET));
   }
   
   int
   db_write_variable(struct db_variable *vp, db_expr_t value)
   {
           db_varfcn_t *func = vp->fcn;
   
           if (func == FCN_NULL) {
                   *(vp->valuep) = value;
                   return (1);
           }
           return ((*func)(vp, &value, DB_VAR_SET));
   }
   
   void
   db_set_cmd(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4)
   {
           struct db_variable *vp;
           db_expr_t value;
           int t;
   
           t = db_read_token();
           if (t == tEOL) {
                   for (vp = db_vars; vp < db_evars; vp++) {
                           if (!db_read_variable(vp, &value)) {
                                   db_printf("$%s\n", vp->name);
                                   continue;
                           }
                           db_printf("$%-8s = %ld\n",
                               vp->name, (unsigned long)value);
                   }
                   return;
           }
           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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