IABSD.fr/src/sys/ddb/db_variables.c

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• Author : anton
  Date : 2019-02-15 18:34:59
  Hash : 03dd915c
  Message : zap trailing empty line

• sys/ddb/db_variables.c

• /*	$OpenBSD: db_variables.c,v 1.20 2019/02/15 18:34:59 anton 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);
  }