//----------------------------------------------------------------------------------------------------------------------------------
// File: init.cpp
//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
// Contents: initialization routines for the extension
// 
// Comments:
//
// License: This software is released under the Microsoft Public License.  A copy of the license agreement 
//          may be found online at http://www.codeplex.com/SQLSRVPHP/license.
//----------------------------------------------------------------------------------------------------------------------------------

#include "php_sqlsrv.h"

#include "version.h"

ZEND_GET_MODULE(g_sqlsrv)

extern "C" {

ZEND_DECLARE_MODULE_GLOBALS(sqlsrv);

}

namespace {

// current subsytem.  defined for the CHECK_SQL_{ERROR|WARNING} macros
int current_log_subsystem = LOG_INIT;

}


// argument info structures for functions, arranged alphabetically.
// see zend_API.h in the PHP sources for more information about these macros
ZEND_BEGIN_ARG_INFO_EX( sqlsrv_begin_transaction_arginfo, 0, 0, 1 )
    ZEND_ARG_INFO( 0, "connection resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO( sqlsrv_cancel_arginfo, 0 )
    ZEND_ARG_INFO( 0, "statement resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_close_arginfo, 0, 0, 1 )
    ZEND_ARG_INFO( 0, "connection resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_client_info_arginfo, 0, 0, 0 )
    ZEND_ARG_INFO( 0, "connection resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_commit_arginfo, 0, 0, 1 )
    ZEND_ARG_INFO( 0, "connection resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_configure_arginfo, 0, 0, 2 )
    ZEND_ARG_INFO( 0, "option name" )
    ZEND_ARG_INFO( 0, "value" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_connect_arginfo, 0, 0, 1 )
    ZEND_ARG_INFO( 0, "server" )
    ZEND_ARG_ARRAY_INFO( 0, "options", 0 )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_errors_arginfo, 0, 1, 0 )
    ZEND_ARG_INFO( 0, "flags (errors, warnings, or all)" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_execute_arginfo, 0, 0, 1 )
    ZEND_ARG_INFO( 0, "statement resource" )
    ZEND_ARG_INFO( 0, "parameters" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_fetch_arginfo, 0, 0, 1 )
    ZEND_ARG_INFO( 0, "statement resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_fetch_array_arginfo, 0, 0, 1 )
    ZEND_ARG_INFO( 0, "statement resource" )
    ZEND_ARG_INFO( 0, "array type" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_fetch_object_arginfo, 0, 0, 1 )
    ZEND_ARG_INFO( 0, "statement resource" )
    ZEND_ARG_INFO( 0, "class name" )
    ZEND_ARG_INFO( 0, "ctor params" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_field_metadata_arginfo, 0, 1, 1 )
    ZEND_ARG_INFO( 0, "statement resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO( sqlsrv_free_stmt_arginfo, 0 )
    ZEND_ARG_INFO( 0, "statement resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_get_config_arginfo, 0, 0, 1 )
    ZEND_ARG_INFO( 0, "option name" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_get_field_arginfo, 0, 0, 2 )
    ZEND_ARG_INFO( 0, "statement resource" )
    ZEND_ARG_INFO( 0, "field index" )
    ZEND_ARG_INFO( 0, "type" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO( sqlsrv_has_rows_arginfo, 0 )
    ZEND_ARG_INFO( 0, "statement resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO( sqlsrv_next_result_arginfo, 0 )
    ZEND_ARG_INFO( 0, "statement resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO( sqlsrv_num_fields_arginfo, 0 )
    ZEND_ARG_INFO( 0, "statement resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO( sqlsrv_num_rows_arginfo, 0 )
    ZEND_ARG_INFO( 0, "statement resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_prepare_arginfo, 0, 1, 2 )
    ZEND_ARG_INFO( 0, "connection resource" )
    ZEND_ARG_INFO( 0, "sql command" )
    ZEND_ARG_INFO( 0, "parameters" )
    ZEND_ARG_ARRAY_INFO( 0, "options", 0 )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_query_arginfo, 0, 1, 2 )
    ZEND_ARG_INFO( 0, "connection resource" )
    ZEND_ARG_INFO( 0, "sql command" )
    ZEND_ARG_INFO( 0, "parameters" )
    ZEND_ARG_ARRAY_INFO( 0, "options", 0 )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX( sqlsrv_rollback_arginfo, 0, 0, 1 )
    ZEND_ARG_INFO( 0, "connection resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO( sqlsrv_rows_affected_arginfo, 0 )
    ZEND_ARG_INFO( 0, "statement resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO( sqlsrv_send_stream_data_arginfo, 0 )
    ZEND_ARG_INFO( 0, "statement resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO( sqlsrv_server_info_arginfo, 0 )
    ZEND_ARG_INFO( 0, "statement resource" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO( sqlsrv_sqltype_size_arginfo, 0 )
    ZEND_ARG_INFO( 0, "size" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO( sqlsrv_sqltype_precision_scale_arginfo, 0 )
    ZEND_ARG_INFO( 0, "precision" )
    ZEND_ARG_INFO( 0, "scale" )
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO( sqlsrv_phptype_encoding_arginfo, 0 )
    ZEND_ARG_INFO( 0, "encoding" )
ZEND_END_ARG_INFO()

// function table with associated arginfo structures
zend_function_entry sqlsrv_functions[] = {
    PHP_FE( sqlsrv_begin_transaction, sqlsrv_begin_transaction_arginfo )
    PHP_FE( sqlsrv_cancel, sqlsrv_cancel_arginfo )
    PHP_FE( sqlsrv_configure, sqlsrv_configure_arginfo )
    PHP_FE( sqlsrv_connect, sqlsrv_connect_arginfo )
    PHP_FE( sqlsrv_client_info, sqlsrv_client_info_arginfo )
    PHP_FE( sqlsrv_close, sqlsrv_close_arginfo )
    PHP_FE( sqlsrv_commit, sqlsrv_commit_arginfo )
    PHP_FE( sqlsrv_errors, sqlsrv_errors_arginfo )
    PHP_FE( sqlsrv_execute, sqlsrv_execute_arginfo )
    PHP_FE( sqlsrv_fetch, sqlsrv_fetch_arginfo )
    PHP_FE( sqlsrv_fetch_array, sqlsrv_fetch_array_arginfo )
    PHP_FE( sqlsrv_fetch_object, sqlsrv_fetch_object_arginfo )
    PHP_FE( sqlsrv_field_metadata, sqlsrv_field_metadata_arginfo )
    PHP_FE( sqlsrv_free_stmt, sqlsrv_close_arginfo )
    PHP_FE( sqlsrv_get_config, sqlsrv_get_config_arginfo )
    PHP_FE( sqlsrv_get_field, sqlsrv_get_field_arginfo )
    PHP_FE( sqlsrv_has_rows, sqlsrv_has_rows_arginfo )
    PHP_FE( sqlsrv_next_result, sqlsrv_next_result_arginfo )
    PHP_FE( sqlsrv_num_fields, sqlsrv_num_fields_arginfo )
    PHP_FE( sqlsrv_num_rows, sqlsrv_num_rows_arginfo )
    PHP_FE( sqlsrv_prepare, sqlsrv_prepare_arginfo )
    PHP_FE( sqlsrv_query, sqlsrv_query_arginfo )
    PHP_FE( sqlsrv_rollback, sqlsrv_rollback_arginfo )
    PHP_FE( sqlsrv_rows_affected, sqlsrv_rows_affected_arginfo )
    PHP_FE( sqlsrv_send_stream_data, sqlsrv_send_stream_data_arginfo )
    PHP_FE( sqlsrv_server_info, sqlsrv_server_info_arginfo )
    PHP_FE( SQLSRV_PHPTYPE_STREAM, sqlsrv_phptype_encoding_arginfo )
    PHP_FE( SQLSRV_PHPTYPE_STRING, sqlsrv_phptype_encoding_arginfo )
    PHP_FE( SQLSRV_SQLTYPE_BINARY, sqlsrv_sqltype_size_arginfo )
    PHP_FE( SQLSRV_SQLTYPE_CHAR, sqlsrv_sqltype_size_arginfo )
    PHP_FE( SQLSRV_SQLTYPE_DECIMAL, sqlsrv_sqltype_precision_scale_arginfo )
    PHP_FE( SQLSRV_SQLTYPE_NCHAR, sqlsrv_sqltype_size_arginfo )
    PHP_FE( SQLSRV_SQLTYPE_NUMERIC, sqlsrv_sqltype_precision_scale_arginfo )
    PHP_FE( SQLSRV_SQLTYPE_NVARCHAR, sqlsrv_sqltype_size_arginfo )
    PHP_FE( SQLSRV_SQLTYPE_VARBINARY, sqlsrv_sqltype_size_arginfo )
    PHP_FE( SQLSRV_SQLTYPE_VARCHAR, sqlsrv_sqltype_size_arginfo )
    {NULL, NULL, NULL}   // end of the table
};

// module global variables (initialized in MINIT and freed in MSHUTDOWN)
HMODULE g_sqlsrv_hmodule = NULL;
HENV g_henv_ncp = SQL_NULL_HANDLE;
HENV g_henv_cp = SQL_NULL_HANDLE;


// the structure returned to Zend that exposes the extension to the Zend engine.
// this structure is defined in zend_modules.h in the PHP sources

zend_module_entry g_sqlsrv_module_entry = 
{
    STANDARD_MODULE_HEADER,
    "sqlsrv", 
    sqlsrv_functions,           // exported function table
    // initialization and shutdown functions
    PHP_MINIT(sqlsrv),
    PHP_MSHUTDOWN(sqlsrv), 
    PHP_RINIT(sqlsrv), 
    PHP_RSHUTDOWN(sqlsrv), 
    PHP_MINFO(sqlsrv),
    // version of the extension.  Matches the version resource of the extension dll
    VER_FILEVERSION_STR,
    PHP_MODULE_GLOBALS(sqlsrv),
    NULL,           
    NULL,
    NULL,
    STANDARD_MODULE_PROPERTIES_EX
};


// Module initialization
// This function is called once per execution of the Zend engine
// We use it to:
// 1) Register our constants.  See MSDN or the function below for the exact constants
//    we register.
// 2) Register our resource types (connection, statement, and stream types)
// 3) Allocate the environment handles for ODBC connections (1 for non pooled
// connections and 1 for pooled connections)
// 4) Register our INI entries.  See MSDN or php_sqlsrv.h for our supported INI entries

PHP_MINIT_FUNCTION(sqlsrv)
{
    SQLSRV_UNUSED( type );

    SQLRETURN r;

    // our global variables are initialized in the RINIT function
#if defined(ZTS)
    if( ts_allocate_id( &sqlsrv_globals_id,
                    sizeof( zend_sqlsrv_globals ),
                    (ts_allocate_ctor) NULL,
                    (ts_allocate_dtor) NULL ) == 0 )
        return FAILURE;
#endif

    SQLSRV_STATIC_ASSERT( sizeof( sqlsrv_sqltype ) == sizeof( long ));
    SQLSRV_STATIC_ASSERT( sizeof( sqlsrv_phptype ) == sizeof( long ));

    LOG( SEV_NOTICE, LOG_INIT, "sqlsrv: entering minit" );

    REGISTER_INI_ENTRIES();
    
    DECL_FUNC_NAME( "PHP_MINIT_FUNCTION for php_sqlsrv" );
    LOG_FUNCTION;

    REGISTER_LONG_CONSTANT( "SQLSRV_ERR_ERRORS",   SQLSRV_ERR_ERRORS, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_ERR_WARNINGS", SQLSRV_ERR_WARNINGS, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_ERR_ALL", SQLSRV_ERR_ALL, CONST_PERSISTENT | CONST_CS );

    REGISTER_LONG_CONSTANT( "SQLSRV_LOG_SYSTEM_OFF", 0, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_LOG_SYSTEM_INIT", LOG_INIT, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_LOG_SYSTEM_CONN", LOG_CONN, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_LOG_SYSTEM_STMT", LOG_STMT, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_LOG_SYSTEM_UTIL", LOG_UTIL, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_LOG_SYSTEM_ALL", -1, CONST_PERSISTENT | CONST_CS ); // -1 so that all the bits are set

    REGISTER_LONG_CONSTANT( "SQLSRV_LOG_SEVERITY_ERROR", SEV_ERROR, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_LOG_SEVERITY_WARNING", SEV_WARNING, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_LOG_SEVERITY_NOTICE", SEV_NOTICE, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_LOG_SEVERITY_ALL", -1, CONST_PERSISTENT | CONST_CS ); // -1 so that all the bits are set

    // register connection resource
    sqlsrv_conn::descriptor = zend_register_list_destructors_ex( 
        sqlsrv_conn_dtor, NULL, "SQL Server Connection", module_number );
    if( sqlsrv_conn::descriptor == FAILURE ) {
        LOG( SEV_ERROR, LOG_INIT, "PHP_MINIT_FUNCTION: connection resource registration failed" );
        return FAILURE;
    }
    
    // register statement resources
    sqlsrv_stmt::descriptor = zend_register_list_destructors_ex( 
        sqlsrv_stmt_dtor, NULL, "SQL Server Statement", module_number );
    if( sqlsrv_stmt::descriptor == FAILURE ) {
        LOG( SEV_ERROR, LOG_INIT, "PHP_MINIT_FUNCTION: statement resource regisration failed" );
        return FAILURE;
    }
    
    sqlsrv_sqltype constant_type;

    REGISTER_LONG_CONSTANT( "SQLSRV_FETCH_NUMERIC", SQLSRV_FETCH_NUMERIC, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_FETCH_ASSOC",   SQLSRV_FETCH_ASSOC, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_FETCH_BOTH",    SQLSRV_FETCH_BOTH, CONST_PERSISTENT | CONST_CS );
    
    REGISTER_LONG_CONSTANT( "SQLSRV_PHPTYPE_NULL",     SQLSRV_PHPTYPE_NULL, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_PHPTYPE_INT",      SQLSRV_PHPTYPE_INT, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_PHPTYPE_FLOAT",    SQLSRV_PHPTYPE_FLOAT, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_PHPTYPE_DATETIME", SQLSRV_PHPTYPE_DATETIME, CONST_PERSISTENT | CONST_CS );

    REGISTER_STRING_CONSTANT( "SQLSRV_ENC_BINARY", "binary", CONST_PERSISTENT | CONST_CS );
    REGISTER_STRING_CONSTANT( "SQLSRV_ENC_CHAR",   "char", CONST_PERSISTENT | CONST_CS );
    
    REGISTER_LONG_CONSTANT( "SQLSRV_NULLABLE_YES",     0, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_NULLABLE_NO",      1, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_NULLABLE_UNKNOWN", 2, CONST_PERSISTENT | CONST_CS );

    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_BIGINT",           SQL_BIGINT, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_BIT",              SQL_BIT, CONST_PERSISTENT | CONST_CS );
    constant_type.typeinfo.type = SQL_TYPE_TIMESTAMP;
    constant_type.typeinfo.size = 23;
    constant_type.typeinfo.scale = 3;
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_DATETIME",         constant_type.value, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_FLOAT",            SQL_FLOAT, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_IMAGE",            SQL_LONGVARBINARY, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_INT",              SQL_INTEGER, CONST_PERSISTENT | CONST_CS );
    constant_type.typeinfo.type = SQL_DECIMAL;
    constant_type.typeinfo.size = 19;
    constant_type.typeinfo.scale = 4;
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_MONEY",            constant_type.value, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_NTEXT",            SQL_WLONGVARCHAR, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_TEXT",             SQL_LONGVARCHAR, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_REAL",             SQL_REAL, CONST_PERSISTENT | CONST_CS );
    constant_type.typeinfo.type = SQL_TYPE_TIMESTAMP;
    constant_type.typeinfo.size = 16;
    constant_type.typeinfo.scale = 0;
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_SMALLDATETIME",    constant_type.value, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_SMALLINT",         SQL_SMALLINT, CONST_PERSISTENT | CONST_CS );
    constant_type.typeinfo.type = SQL_DECIMAL;
    constant_type.typeinfo.size = 10;
    constant_type.typeinfo.scale = 4;
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_SMALLMONEY",       constant_type.value, CONST_PERSISTENT | CONST_CS );
    constant_type.typeinfo.type = SQL_BINARY;
    constant_type.typeinfo.size = 8;
    constant_type.typeinfo.scale = 0;
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_TIMESTAMP",        constant_type.value, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_TINYINT",          SQL_TINYINT, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_UDT",              SQL_SS_UDT, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_UNIQUEIDENTIFIER", SQL_GUID, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_XML",              SQL_SS_XML, CONST_PERSISTENT | CONST_CS );
    constant_type.typeinfo.type = SQL_TYPE_DATE;
    constant_type.typeinfo.size = 10;
    constant_type.typeinfo.scale = 0;
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_DATE",             constant_type.value, CONST_PERSISTENT | CONST_CS );
    constant_type.typeinfo.type = SQL_SS_TIME2;
    constant_type.typeinfo.size = 16;
    constant_type.typeinfo.scale = 7;
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_TIME",             constant_type.value, CONST_PERSISTENT | CONST_CS );
    constant_type.typeinfo.type = SQL_SS_TIMESTAMPOFFSET;
    constant_type.typeinfo.size = 34;
    constant_type.typeinfo.scale = 7;
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_DATETIMEOFFSET",   constant_type.value, CONST_PERSISTENT | CONST_CS );
    constant_type.typeinfo.type = SQL_TYPE_TIMESTAMP;
    constant_type.typeinfo.size = 27;
    constant_type.typeinfo.scale = 7;
    REGISTER_LONG_CONSTANT( "SQLSRV_SQLTYPE_DATETIME2",        constant_type.value, CONST_PERSISTENT | CONST_CS );

    REGISTER_LONG_CONSTANT( "SQLSRV_PARAM_IN",        SQL_PARAM_INPUT, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_PARAM_OUT",       SQL_PARAM_OUTPUT, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_PARAM_INOUT", SQL_PARAM_INPUT_OUTPUT, CONST_PERSISTENT | CONST_CS );

    REGISTER_LONG_CONSTANT( "SQLSRV_TXN_READ_UNCOMMITTED", SQL_TXN_READ_UNCOMMITTED, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_TXN_READ_COMMITTED",   SQL_TXN_READ_UNCOMMITTED, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_TXN_REPEATABLE_READ",  SQL_TXN_REPEATABLE_READ, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_TXN_SERIALIZABLE",     SQL_TXN_SERIALIZABLE, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_TXN_SNAPSHOT",         SQL_TXN_SS_SNAPSHOT, CONST_PERSISTENT | CONST_CS );

    REGISTER_LONG_CONSTANT( "SQLSRV_SCROLL_NEXT",     SQL_FETCH_NEXT, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SCROLL_PRIOR",    SQL_FETCH_PRIOR, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SCROLL_FIRST",    SQL_FETCH_FIRST, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SCROLL_LAST",     SQL_FETCH_LAST, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SCROLL_ABSOLUTE", SQL_FETCH_ABSOLUTE, CONST_PERSISTENT | CONST_CS );
    REGISTER_LONG_CONSTANT( "SQLSRV_SCROLL_RELATIVE", SQL_FETCH_RELATIVE, CONST_PERSISTENT | CONST_CS );

    REGISTER_STRING_CONSTANT( "SQLSRV_CURSOR_FORWARD", "forward", CONST_PERSISTENT | CONST_CS );
    REGISTER_STRING_CONSTANT( "SQLSRV_CURSOR_STATIC",  "static", CONST_PERSISTENT | CONST_CS );
    REGISTER_STRING_CONSTANT( "SQLSRV_CURSOR_DYNAMIC", "dynamic", CONST_PERSISTENT | CONST_CS );
    REGISTER_STRING_CONSTANT( "SQLSRV_CURSOR_KEYSET",  "keyset", CONST_PERSISTENT | CONST_CS );

    if( php_register_url_stream_wrapper( SQLSRV_STREAM_WRAPPER, &g_sqlsrv_stream_wrapper TSRMLS_CC ) == FAILURE ) {
        LOG( SEV_ERROR, LOG_INIT, "PHP_RINIT_FUNCTION: stream registration failed" );
        return FAILURE;
    }

    g_henv_ncp = SQL_NULL_HANDLE;
    g_henv_cp = SQL_NULL_HANDLE;

    // allocate the non pooled environment handle
    r = SQLAllocHandle( SQL_HANDLE_ENV, SQL_NULL_HANDLE, &(g_henv_ncp));
    if( !SQL_SUCCEEDED( r )) {

        g_henv_ncp = SQL_NULL_HANDLE;
        LOG( SEV_ERROR, LOG_INIT, "SQLAllocHandle for non pooled connections failed." );
        return FAILURE;
    }

    sqlsrv_henv henv_ctx( g_henv_cp );

    // set to ODBC 3
    r = SQLSetEnvAttr( g_henv_ncp, SQL_ATTR_ODBC_VERSION, reinterpret_cast<SQLPOINTER>( SQL_OV_ODBC3 ), SQL_IS_INTEGER );
    if( r == SQL_ERROR ) {

        SQLFreeHandle( SQL_HANDLE_ENV, g_henv_ncp );
        g_henv_ncp = SQL_NULL_HANDLE;
        LOG( SEV_ERROR, LOG_INIT, "SQLSetEnvAttr failed." );
        return FAILURE;
    }
    CHECK_SQL_WARNING( r, (&henv_ctx), _FN_, NULL );

    // disable connection pooling
    r = SQLSetEnvAttr( g_henv_ncp, SQL_ATTR_CONNECTION_POOLING, reinterpret_cast<SQLPOINTER>( SQL_CP_OFF ), SQL_IS_UINTEGER );
    if( r == SQL_ERROR ) {

        SQLFreeHandle( SQL_HANDLE_ENV, g_henv_ncp );
        g_henv_ncp = SQL_NULL_HANDLE;
        LOG( SEV_ERROR, LOG_INIT, "Failed to turn on connection pooling." );
        return FAILURE;
    }
    CHECK_SQL_WARNING( r, (&henv_ctx), _FN_, NULL );

    // allocate the pooled envrionment handle
    r = SQLAllocHandle( SQL_HANDLE_ENV, SQL_NULL_HANDLE, &(g_henv_cp));
    if( r == SQL_ERROR ) {

        SQLFreeHandle( SQL_HANDLE_ENV, g_henv_ncp );
        g_henv_ncp = SQL_NULL_HANDLE;
        g_henv_cp = SQL_NULL_HANDLE;
        LOG( SEV_ERROR, LOG_INIT, "SQLAllocHandle for pooled connections failed." );
        return FAILURE;
    }
    CHECK_SQL_WARNING( r, (&henv_ctx), _FN_, NULL );

    // set to ODBC 3
    r = SQLSetEnvAttr( g_henv_cp, SQL_ATTR_ODBC_VERSION, reinterpret_cast<SQLPOINTER>( SQL_OV_ODBC3 ), SQL_IS_INTEGER );
    if( r == SQL_ERROR ) {

        SQLFreeHandle( SQL_HANDLE_ENV, g_henv_ncp );
        SQLFreeHandle( SQL_HANDLE_ENV, g_henv_cp );
        g_henv_ncp = SQL_NULL_HANDLE;
        g_henv_cp = SQL_NULL_HANDLE;
        LOG( SEV_ERROR, LOG_INIT, "SQLSetEnvAttr failed to set ODBC version 3." );
        return FAILURE;
    }
    CHECK_SQL_WARNING( r, (&henv_ctx), _FN_, NULL );

    // enable connection pooling
    r = SQLSetEnvAttr( g_henv_cp, SQL_ATTR_CONNECTION_POOLING, reinterpret_cast<SQLPOINTER>( SQL_CP_ONE_PER_HENV ), SQL_IS_UINTEGER );
    if( r == SQL_ERROR ) {

        SQLFreeHandle( SQL_HANDLE_ENV, g_henv_ncp );
        SQLFreeHandle( SQL_HANDLE_ENV, g_henv_cp );
        g_henv_ncp = SQL_NULL_HANDLE;
        g_henv_cp = SQL_NULL_HANDLE;
        LOG( SEV_ERROR, LOG_INIT, "Failed to turn on connection pooling." );
        return FAILURE;
    }
    CHECK_SQL_WARNING( r, (&henv_ctx), _FN_, NULL );

    return SUCCESS;
}


// Module shutdown function
// Free the environment handles allocated in MINIT and unregister our stream wrapper.
// Resource types and constants are automatically released since we don't flag them as
// persistent when they are registered.

PHP_MSHUTDOWN_FUNCTION(sqlsrv)
{
    SQLSRV_UNUSED( type );

    UNREGISTER_INI_ENTRIES();

    if( g_henv_ncp != SQL_NULL_HANDLE ) {

        SQLFreeHandle( SQL_HANDLE_ENV, g_henv_ncp );
        g_henv_ncp = SQL_NULL_HANDLE;
    }

    if( g_henv_cp != SQL_NULL_HANDLE ) {

        SQLFreeHandle( SQL_HANDLE_ENV, g_henv_cp );
        g_henv_cp = SQL_NULL_HANDLE;
    }

    if( php_unregister_url_stream_wrapper( SQLSRV_STREAM_WRAPPER TSRMLS_CC ) == FAILURE ) {
        return FAILURE;
    }

    return SUCCESS;
}


// Request initialization function
// This function is called once per PHP script execution
// Initialize request globals used in the request, including those that correspond to INI entries.
// Also, we allocate a list of warnings "to ignore", meaning that they are warnings that do not
// trigger errors when WarningsReturnAsErrors is true.  If you have warnings that you want ignored
// (such as return values from stored procedures), add them to this collection and they won't be
// returned as errors.  Or you could just set WarningsReturnAsErrors to false.

PHP_RINIT_FUNCTION(sqlsrv)
{
    SQLSRV_UNUSED( module_number );
    SQLSRV_UNUSED( type );

    sqlsrv_error to_ignore;
    
    LOG( SEV_NOTICE, LOG_INIT, "sqlsrv: entering rinit" );
    SQLSRV_G( log_subsystems ) = 0;
    SQLSRV_G( log_severity ) = SEV_ERROR;
    SQLSRV_G( warnings_return_as_errors ) = true;
    SQLSRV_G( henv_context ) = new ( sqlsrv_malloc( sizeof( sqlsrv_henv ))) sqlsrv_henv( g_henv_cp );
    ALLOC_INIT_ZVAL( SQLSRV_G( errors ));
    Z_SET_ISREF_P( SQLSRV_G( errors ));
    ALLOC_INIT_ZVAL( SQLSRV_G( warnings ));
    Z_SET_ISREF_P( SQLSRV_G( warnings ));

    // read INI settings
    SQLSRV_G( warnings_return_as_errors ) = INI_BOOL( INI_PREFIX INI_WARNINGS_RETURN_AS_ERRORS );
    SQLSRV_G( log_severity ) = INI_BOOL( INI_PREFIX INI_LOG_SEVERITY );
    SQLSRV_G( log_subsystems ) = INI_BOOL( INI_PREFIX INI_LOG_SUBSYSTEMS );

    LOG( SEV_NOTICE, LOG_INIT, INI_PREFIX INI_WARNINGS_RETURN_AS_ERRORS " = %1!s!", SQLSRV_G( warnings_return_as_errors ) ? "On" : "Off");
    LOG( SEV_NOTICE, LOG_INIT, INI_PREFIX INI_LOG_SEVERITY " = %1!d!", SQLSRV_G( log_severity ));
    LOG( SEV_NOTICE, LOG_INIT, INI_PREFIX INI_LOG_SUBSYSTEMS " = %1!d!", SQLSRV_G( log_subsystems ));

    // initialize list of warnings to ignore
    ALLOC_HASHTABLE( SQLSRV_G( warnings_to_ignore ));
    int zr = zend_hash_init( SQLSRV_G( warnings_to_ignore ), 5, NULL, NULL, 0 );
    if( zr == FAILURE ) {
        LOG( SEV_ERROR, LOG_INIT, "PHP_RINIT: warnings hash table failure" );
        return FAILURE;
    }

    // changed database warning
    to_ignore.sqlstate = "01000";
    to_ignore.native_message = NULL;
    to_ignore.native_code = 5701;
    to_ignore.format = false;
    zr = zend_hash_next_index_insert( SQLSRV_G( warnings_to_ignore ), &to_ignore, sizeof( sqlsrv_error ), NULL );
    if( zr == FAILURE ) {
        LOG( SEV_ERROR, LOG_INIT, "PHP_RINIT: warnings hash table failure" );
        return FAILURE;
    }
    // changed language warning
    to_ignore.sqlstate = "01000";
    to_ignore.native_message = NULL;
    to_ignore.native_code = 5703;
    to_ignore.format = false;
    zr = zend_hash_next_index_insert( SQLSRV_G( warnings_to_ignore ), &to_ignore, sizeof( sqlsrv_error ), NULL );
    if( zr == FAILURE ) {
        LOG( SEV_ERROR, LOG_INIT, "PHP_RINIT: warnings hash table failure" );
        return FAILURE;
    }
    // option value changed
    to_ignore.sqlstate = "01S02";
    to_ignore.native_message = NULL;
    to_ignore.native_code = -1;
    to_ignore.format = false;
    zr = zend_hash_next_index_insert( SQLSRV_G( warnings_to_ignore ), &to_ignore, sizeof( sqlsrv_error ), NULL );
    if( zr == FAILURE ) {
        LOG( SEV_ERROR, LOG_INIT, "PHP_RINIT: warnings hash table failure" );
        return FAILURE;
    }
    // cursor operation conflict
    to_ignore.sqlstate = "01001";
    to_ignore.native_message = NULL;
    to_ignore.native_code = -1;
    to_ignore.format = false;
    zr = zend_hash_next_index_insert( SQLSRV_G( warnings_to_ignore ), &to_ignore, sizeof( sqlsrv_error ), NULL );
    if( zr == FAILURE ) {
        LOG( SEV_ERROR, LOG_INIT, "PHP_RINIT: warnings hash table failure" );
        return FAILURE;
    }
    // null value eliminiated in set function
    to_ignore.sqlstate = "01003";
    to_ignore.native_message = NULL;
    to_ignore.native_code = -1;
    to_ignore.format = false;
    zr = zend_hash_next_index_insert( SQLSRV_G( warnings_to_ignore ), &to_ignore, sizeof( sqlsrv_error ), NULL /*no pointer to the new value necessasry*/ );
    if( zr == FAILURE ) {
        LOG( SEV_ERROR, LOG_INIT, "PHP_RINIT: warnings hash table failure" );
        return FAILURE;
    }

    // supported encodings
    ALLOC_HASHTABLE( SQLSRV_G( encodings ));
    zr = zend_hash_init( SQLSRV_G( encodings ), 5, NULL /*use standard hash function*/, NULL /*no resource destructor*/, 0 /*not persistent*/ );
    if( zr == FAILURE ) {
        LOG( SEV_ERROR, LOG_INIT, "PHP_RINIT: encodings hash table failure" );
        return FAILURE;
    }

    sqlsrv_encoding sql_enc_char( "char", SQLSRV_ENCODING_CHAR );
    zr = zend_hash_next_index_insert( SQLSRV_G( encodings ), &sql_enc_char, sizeof( sqlsrv_encoding ), NULL /*no pointer to the new value necessasry*/ );
    if( zr == FAILURE ) {
        LOG( SEV_ERROR, LOG_INIT, "PHP_RINIT: encodings hash table failure" );
        return FAILURE;
    }
    
    sqlsrv_encoding sql_enc_bin( "binary", SQLSRV_ENCODING_BINARY, true );
    zr = zend_hash_next_index_insert( SQLSRV_G( encodings ), &sql_enc_bin, sizeof( sqlsrv_encoding ), NULL  /*no pointer to the new value necessasry*/ );
    if( zr == FAILURE ) {
        LOG( SEV_ERROR, LOG_INIT, "PHP_RINIT: encodings hash table failure" );
        return FAILURE;
    }

    sqlsrv_encoding sql_enc_utf8( "utf-8", CP_UTF8 );
    zr = zend_hash_next_index_insert( SQLSRV_G( encodings ), &sql_enc_utf8, sizeof( sqlsrv_encoding ), NULL  /*no pointer to the new value necessasry*/ );
    if( zr == FAILURE ) {
        LOG( SEV_ERROR, LOG_INIT, "PHP_RINIT: encodings hash table failure" );
        return FAILURE;
    }
 
    // verify memory at the end of the request (in debug mode only)
    full_mem_check(MEMCHECK_SILENT);
    return SUCCESS;
}


// Request shutdown
// Called at the end of a script's execution
// Simply releases the variables allocated during request initialization.

PHP_RSHUTDOWN_FUNCTION(sqlsrv)
{
    SQLSRV_UNUSED( module_number );
    SQLSRV_UNUSED( type );

    LOG( SEV_NOTICE, LOG_INIT, "sqlsrv: entering rshutdown" );
    reset_errors( TSRMLS_C );

    zval_ptr_dtor( &SQLSRV_G( errors ));
    zval_ptr_dtor( &SQLSRV_G( warnings ));
    if( SQLSRV_G( warnings_to_ignore )) {
        zend_hash_destroy( SQLSRV_G( warnings_to_ignore ));
        FREE_HASHTABLE( SQLSRV_G( warnings_to_ignore ));
    }
    sqlsrv_free( SQLSRV_G( henv_context ));

    // verify memory at the end of the request (in debug mode only)
    full_mem_check(MEMCHECK_SILENT);

    return SUCCESS;
}

// Called for php_info();  Displays the INI settings registered and their current values

PHP_MINFO_FUNCTION(sqlsrv)
{
#if defined(ZTS)
    SQLSRV_UNUSED( tsrm_ls );
#endif

    php_info_print_table_start();
    php_info_print_table_header(2, "sqlsrv support", "enabled");
    DISPLAY_INI_ENTRIES();
    php_info_print_table_end();
}


// DllMain for the extension.  

BOOL WINAPI DllMain( HINSTANCE hinstDLL, DWORD fdwReason, LPVOID )
{
    switch( fdwReason ) {
        case DLL_PROCESS_ATTACH:
            // store the module handle for use by client_info and server_info
            g_sqlsrv_hmodule = hinstDLL;
            break;
        default:
            break;
    }

    return TRUE;
}