Line data    Source code

       1             : /*
       2             :  * SPDX-License-Identifier: MPL-2.0
       3             :  *
       4             :  * This Source Code Form is subject to the terms of the Mozilla Public
       5             :  * License, v. 2.0.  If a copy of the MPL was not distributed with this
       6             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       7             :  *
       8             :  * Copyright 2024 MonetDB Foundation;
       9             :  * Copyright August 2008 - 2023 MonetDB B.V.;
      10             :  * Copyright 1997 - July 2008 CWI.
      11             :  */
      12             : 
      13             : /*
      14             :  * This code was created by Peter Harvey (mostly during Christmas 98/99).
      15             :  * This code is LGPL. Please ensure that this message remains in future
      16             :  * distributions and uses of this code (that's about all I get out of it).
      17             :  * - Peter Harvey pharvey@codebydesign.com
      18             :  *
      19             :  * This file has been modified for the MonetDB project.  See the file
      20             :  * Copyright in this directory for more information.
      21             :  */
      22             : 
      23             : /**********************************************
      24             :  * ODBCEnv.c
      25             :  *
      26             :  * Description:
      27             :  * This file contains the functions which operate on
      28             :  * ODBC environment structures/objects (see ODBCEnv.h).
      29             :  *
      30             :  * Author: Martin van Dinther, Sjoerd Mullender
      31             :  * Date  : 30 aug 2002
      32             :  *
      33             :  **********************************************/
      34             : 
      35             : #include "ODBCGlobal.h"
      36             : #include "ODBCEnv.h"
      37             : 
      38             : #define ODBC_ENV_MAGIC_NR  341  /* for internal sanity check only */
      39             : 
      40             : 
      41             : /*
      42             :  * Creates a new allocated ODBCEnv object and initializes it.
      43             :  *
      44             :  * Precondition: none
      45             :  * Postcondition: returns a new ODBCEnv object
      46             :  */
      47             : ODBCEnv *
      48          41 : newODBCEnv(void)
      49             : {
      50          41 :         ODBCEnv *env = (ODBCEnv *) malloc(sizeof(ODBCEnv));
      51             : 
      52          41 :         if (env == NULL)
      53             :                 return NULL;
      54             : 
      55          41 :         *env = (ODBCEnv) {
      56             :                 .Type = ODBC_ENV_MAGIC_NR,
      57             :         };
      58             : 
      59          41 :         return env;
      60             : }
      61             : 
      62             : 
      63             : /*
      64             :  * Check if the environment handle is valid.
      65             :  * Note: this function is used internally by the driver to assert legal
      66             :  * and save usage of the handle and prevent crashes as much as possible.
      67             :  *
      68             :  * Precondition: none
      69             :  * Postcondition: returns 1 if it is a valid environment handle,
      70             :  *      returns 0 if is invalid and thus an unusable handle.
      71             :  */
      72             : int
      73         201 : isValidEnv(ODBCEnv *env)
      74             : {
      75             : #ifdef ODBCDEBUG
      76         201 :         if (!(env && env->Type == ODBC_ENV_MAGIC_NR))
      77           0 :                 ODBCLOG("env %p not a valid environment handle\n", env);
      78             : #endif
      79         201 :         return env && env->Type == ODBC_ENV_MAGIC_NR;
      80             : }
      81             : 
      82             : 
      83             : /*
      84             :  * Creates and adds an error msg object to the end of the error list of
      85             :  * this ODBCEnv struct.
      86             :  * When the errMsg is NULL and the SQLState is an ISO SQLState the
      87             :  * standard ISO message text for the SQLState is used as message.
      88             :  *
      89             :  * Precondition: env must be valid. SQLState and errMsg may be NULL.
      90             :  */
      91             : void
      92           0 : addEnvError(ODBCEnv *env, const char *SQLState, const char *errMsg, int nativeErrCode)
      93             : {
      94           0 :         ODBCError *error = NULL;
      95             : 
      96             : #ifdef ODBCDEBUG
      97           0 :         ODBCLOG("addEnvError %p %s %s %d\n", env, SQLState, errMsg ? errMsg : getStandardSQLStateMsg(SQLState), nativeErrCode);
      98             : #endif
      99           0 :         assert(isValidEnv(env));
     100             : 
     101           0 :         error = newODBCError(SQLState, errMsg, nativeErrCode);
     102           0 :         appendODBCError(&env->Error, error);
     103           0 : }
     104             : 
     105             : 
     106             : /*
     107             :  * Extracts an error object from the error list of this ODBCEnv struct.
     108             :  * The error object itself is removed from the error list.
     109             :  * The caller is now responsible for freeing the error object memory.
     110             :  *
     111             :  * Precondition: env and error must be valid
     112             :  * Postcondition: returns a ODBCError object or null when no error is available.
     113             :  */
     114             : ODBCError *
     115           0 : getEnvError(ODBCEnv *env)
     116             : {
     117           0 :         assert(isValidEnv(env));
     118           0 :         return env->Error;
     119             : }
     120             : 
     121             : 
     122             : /*
     123             :  * Destroys the ODBCEnv object including its own managed data.
     124             :  *
     125             :  * Precondition: env must be valid and no ODBCDbc objects may refer to this env.
     126             :  * Postcondition: env is completely destroyed, env handle is become invalid.
     127             :  */
     128             : void
     129          39 : destroyODBCEnv(ODBCEnv *env)
     130             : {
     131          39 :         assert(isValidEnv(env));
     132          39 :         assert(env->FirstDbc == NULL);
     133             : 
     134             :         /* first set this object to invalid */
     135          39 :         env->Type = 0;
     136             : 
     137          39 :         deleteODBCErrorList(&env->Error);
     138          39 :         free((void *) env);
     139          39 : }