db_variables.c

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    1 /*
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 Carnegie Mellon University
    4  * All Rights Reserved.
    5  *
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  *
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  *
   16  * Carnegie Mellon requests users of this software to return to
   17  *
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  *
   23  * any improvements or extensions that they make and grant Carnegie the
   24  * rights to redistribute these changes.
   25  *
   26  * $FreeBSD: src/sys/ddb/db_variables.c,v 1.18 1999/08/28 00:41:11 peter Exp $
   27  */
   28 
   29 /*
   30  *      Author: David B. Golub, Carnegie Mellon University
   31  *      Date:   7/90
   32  */
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 
   37 #include <ddb/ddb.h>
   38 #include <ddb/db_lex.h>
   39 #include <ddb/db_variables.h>
   40 
   41 static int      db_find_variable (struct db_variable **varp);
   42 static void     db_write_variable (struct db_variable *, db_expr_t *);
   43 
   44 #ifdef notused
   45 static int      db_set_variable (db_expr_t value);
   46 #endif
   47 
   48 static struct db_variable db_vars[] = {
   49         { "radix",      &db_radix, NULL },
   50         { "maxoff",     &db_maxoff, NULL },
   51         { "maxwidth",   &db_max_width, NULL },
   52         { "tabstops",   &db_tab_stop_width, NULL },
   53 };
   54 static struct db_variable *db_evars = db_vars + NELEM(db_vars);
   55 
   56 static int
   57 db_find_variable(struct db_variable **varp)
   58 {
   59         int     t;
   60         struct db_variable *vp;
   61 
   62         t = db_read_token();
   63         if (t == tIDENT) {
   64             for (vp = db_vars; vp < db_evars; vp++) {
   65                 if (!strcmp(db_tok_string, vp->name)) {
   66                     *varp = vp;
   67                     return (1);
   68                 }
   69             }
   70             for (vp = db_regs; vp < db_eregs; vp++) {
   71                 if (!strcmp(db_tok_string, vp->name)) {
   72                     *varp = vp;
   73                     return (1);
   74                 }
   75             }
   76         }
   77         db_error("Unknown variable\n");
   78         return (0);
   79 }
   80 
   81 int
   82 db_get_variable(db_expr_t *valuep)
   83 {
   84         struct db_variable *vp;
   85 
   86         if (!db_find_variable(&vp))
   87             return (0);
   88 
   89         db_read_variable(vp, valuep);
   90 
   91         return (1);
   92 }
   93 
   94 #ifdef notused
   95 static int
   96 db_set_variable(db_expr_t value)
   97 {
   98         struct db_variable *vp;
   99 
  100         if (!db_find_variable(&vp))
  101             return (0);
  102 
  103         db_write_variable(vp, &value);
  104 
  105         return (1);
  106 }
  107 #endif
  108 
  109 void
  110 db_read_variable(struct db_variable *vp, db_expr_t *valuep)
  111 {
  112         db_varfcn_t     *func = vp->fcn;
  113 
  114         if (func == NULL)
  115             *valuep = *(vp->valuep);
  116         else
  117             (*func)(vp, valuep, DB_VAR_GET);
  118 }
  119 
  120 static void
  121 db_write_variable(struct db_variable *vp, db_expr_t *valuep)
  122 {
  123         db_varfcn_t     *func = vp->fcn;
  124 
  125         if (func == NULL)
  126             *(vp->valuep) = *valuep;
  127         else
  128             (*func)(vp, valuep, DB_VAR_SET);
  129 }
  130 
  131 void
  132 db_set_cmd(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
  133 {
  134         db_expr_t       value;
  135         struct db_variable *vp;
  136         int     t;
  137 
  138         t = db_read_token();
  139         if (t != tDOLLAR) {
  140             db_error("Unknown variable\n");
  141             return;
  142         }
  143         if (!db_find_variable(&vp)) {
  144             db_error("Unknown variable\n");
  145             return;
  146         }
  147 
  148         t = db_read_token();
  149         if (t != tEQ)
  150             db_unread_token(t);
  151 
  152         if (!db_expression(&value)) {
  153             db_error("No value\n");
  154             return;
  155         }
  156         if (db_read_token() != tEOL) {
  157             db_error("?\n");
  158         }
  159 
  160         db_write_variable(vp, &value);
  161 }

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

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sys/ddb/db_variables.c