esql_whenever.c

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/*
 * Copyright 2008 Search Solution Corporation
 * Copyright 2016 CUBRID Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */

/*
 * esql_whenever.c - Routines for preprocessor handling of whenever conditions.
 */

#ident "$Id$"

#include <stdlib.h>
#include "misc_string.h"
#include "esql_misc.h"
#include "memory_alloc.h"
#include "esql_translate.h"


static void free_last_referenced_name (WHENEVER_SCOPE * scope, WHENEVER_SCOPE * new_scope);

static WHENEVER_SCOPE default_whenever_scope_initializer = { {{CONTINUE, NULL}, {CONTINUE, NULL}, {CONTINUE, NULL}} };

#define LAST_REF(condition)                                             \
    ((name = scope->cond[condition].name) != NULL                       \
     && (new_scope == NULL || name != new_scope->cond[condition].name))

static void
free_last_referenced_name (WHENEVER_SCOPE * scope, WHENEVER_SCOPE * new_scope)
{
  char *name;

  if (LAST_REF (SQLWARNING))
    {
      free_and_init (name);
    }
  if (LAST_REF (SQLERROR))
    {
      free_and_init (name);
    }
  if (LAST_REF (NOT_FOUND))
    {
      free_and_init (name);
    }
}

/*
 * pp_init_whenever_scope() - Allocate a new whenever scope block,
 *    initializing it from the old scope.
 * return : void
 * scope(in) :
 * old_scope(in) : A pointer to another scope block.
 */
void
pp_init_whenever_scope (WHENEVER_SCOPE * scope, WHENEVER_SCOPE * old_scope)
{
  if (old_scope == NULL)
    {
      old_scope = &default_whenever_scope_initializer;
    }
  /*
   * note : this copies any existing pointers to names associated
   * with GOTO and CALL actions, so you can't just blindly free_and_init()
   * the pointers when the scope is exited.
   */
  *scope = *old_scope;
}

/*
 * pp_finish_whenever_scope() - Deallocate the scope if necessary,
 *    and free all strings it holds.
 * return : void
 * scope(in): A pointer to a scope to be freed.
 * new_scope(in):
 */
void
pp_finish_whenever_scope (WHENEVER_SCOPE * scope, WHENEVER_SCOPE * new_scope)
{

  free_last_referenced_name (scope, new_scope);

  if (new_scope == NULL)
    {
      new_scope = &default_whenever_scope_initializer;
    }

  esql_Translate_table.tr_whenever (SQLWARNING, new_scope->cond[SQLWARNING].action, new_scope->cond[SQLWARNING].name);
  esql_Translate_table.tr_whenever (SQLERROR, new_scope->cond[SQLERROR].action, new_scope->cond[SQLERROR].name);
  esql_Translate_table.tr_whenever (NOT_FOUND, new_scope->cond[NOT_FOUND].action, new_scope->cond[NOT_FOUND].name);
}