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 /*
   27  *      Author: David B. Golub, Carnegie Mellon University
   28  *      Date:   7/90
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/5.3/sys/ddb/db_variables.c 131952 2004-07-10 23:47:20Z marcel $");
   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 
   43 static struct db_variable db_vars[] = {
   44         { "radix",      &db_radix, FCN_NULL },
   45         { "maxoff",     &db_maxoff, FCN_NULL },
   46         { "maxwidth",   &db_max_width, FCN_NULL },
   47         { "tabstops",   &db_tab_stop_width, FCN_NULL },
   48 };
   49 static struct db_variable *db_evars =
   50         db_vars + sizeof(db_vars)/sizeof(db_vars[0]);
   51 
   52 static int
   53 db_find_variable(struct db_variable **varp)
   54 {
   55         struct db_variable *vp;
   56         int t;
   57 
   58         t = db_read_token();
   59         if (t == tIDENT) {
   60                 for (vp = db_vars; vp < db_evars; vp++) {
   61                         if (!strcmp(db_tok_string, vp->name)) {
   62                                 *varp = vp;
   63                                 return (1);
   64                         }
   65                 }
   66                 for (vp = db_regs; vp < db_eregs; vp++) {
   67                         if (!strcmp(db_tok_string, vp->name)) {
   68                                 *varp = vp;
   69                                 return (1);
   70                         }
   71                 }
   72         }
   73         db_error("Unknown variable\n");
   74         return (0);
   75 }
   76 
   77 int
   78 db_get_variable(db_expr_t *valuep)
   79 {
   80         struct db_variable *vp;
   81 
   82         if (!db_find_variable(&vp))
   83                 return (0);
   84 
   85         return (db_read_variable(vp, valuep));
   86 }
   87 
   88 int
   89 db_set_variable(db_expr_t value)
   90 {
   91         struct db_variable *vp;
   92 
   93         if (!db_find_variable(&vp))
   94                 return (0);
   95 
   96         return (db_write_variable(vp, value));
   97 }
   98 
   99 int
  100 db_read_variable(struct db_variable *vp, db_expr_t *valuep)
  101 {
  102         db_varfcn_t *func = vp->fcn;
  103 
  104         if (func == FCN_NULL) {
  105                 *valuep = *(vp->valuep);
  106                 return (1);
  107         }
  108         return ((*func)(vp, valuep, DB_VAR_GET));
  109 }
  110 
  111 int
  112 db_write_variable(struct db_variable *vp, db_expr_t value)
  113 {
  114         db_varfcn_t *func = vp->fcn;
  115 
  116         if (func == FCN_NULL) {
  117                 *(vp->valuep) = value;
  118                 return (1);
  119         }
  120         return ((*func)(vp, &value, DB_VAR_SET));
  121 }
  122 
  123 void
  124 db_set_cmd(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
  125 {
  126         struct db_variable *vp;
  127         db_expr_t value;
  128         int t;
  129 
  130         t = db_read_token();
  131         if (t != tDOLLAR) {
  132                 db_error("Unknown variable\n");
  133                 return;
  134         }
  135         if (!db_find_variable(&vp)) {
  136                 db_error("Unknown variable\n");
  137                 return;
  138         }
  139 
  140         t = db_read_token();
  141         if (t != tEQ)
  142                 db_unread_token(t);
  143 
  144         if (!db_expression(&value)) {
  145                 db_error("No value\n");
  146                 return;
  147         }
  148         if (db_read_token() != tEOL)
  149                 db_error("?\n");
  150 
  151         db_write_variable(vp, value);
  152 }

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

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