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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2012 Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@zend.com> |
| Zeev Suraski <zeev@zend.com> |
+----------------------------------------------------------------------+
*/

/* $Id$ */

#include "zend_extensions.h"

ZEND_API zend_llist zend_extensions;
static int last_resource_number;

int zend_load_extension(const char *path)
{
#if ZEND_EXTENSIONS_SUPPORT
DL_HANDLE handle;
zend_extension *new_extension;
zend_extension_version_info *extension_version_info;

handle = DL_LOAD(path);
if (!handle) {
#ifndef ZEND_WIN32
fprintf(stderr, "Failed loading %s: %s\n", path, DL_ERROR());
/* See http://support.microsoft.com/kb/190351 */
#ifdef PHP_WIN32
fflush(stderr);
#endif
#else
fprintf(stderr, "Failed loading %s\n", path);
#endif
return FAILURE;
}

extension_version_info = (zend_extension_version_info *) DL_FETCH_SYMBOL(handle, "extension_version_info");
if (!extension_version_info) {
extension_version_info = (zend_extension_version_info *) DL_FETCH_SYMBOL(handle, "_extension_version_info");
}
new_extension = (zend_extension *) DL_FETCH_SYMBOL(handle, "zend_extension_entry");
if (!new_extension) {
new_extension = (zend_extension *) DL_FETCH_SYMBOL(handle, "_zend_extension_entry");
}
if (!extension_version_info || !new_extension) {
fprintf(stderr, "%s doesn't appear to be a valid Zend extension\n", path);
/* See http://support.microsoft.com/kb/190351 */
#ifdef PHP_WIN32
fflush(stderr);
#endif
DL_UNLOAD(handle);
return FAILURE;
}


/* allow extension to proclaim compatibility with any Zend version */
if (extension_version_info->zend_extension_api_no != ZEND_EXTENSION_API_NO &&(!new_extension->api_no_check || new_extension->api_no_check(ZEND_EXTENSION_API_NO) != SUCCESS)) {
if (extension_version_info->zend_extension_api_no > ZEND_EXTENSION_API_NO) {
fprintf(stderr, "%s requires Zend Engine API version %d.\n"
"The Zend Engine API version %d which is installed, is outdated.\n\n",
new_extension->name,
extension_version_info->zend_extension_api_no,
ZEND_EXTENSION_API_NO);
/* See http://support.microsoft.com/kb/190351 */
#ifdef PHP_WIN32
fflush(stderr);
#endif
DL_UNLOAD(handle);
return FAILURE;
} else if (extension_version_info->zend_extension_api_no < ZEND_EXTENSION_API_NO) {
fprintf(stderr, "%s requires Zend Engine API version %d.\n"
"The Zend Engine API version %d which is installed, is newer.\n"
"Contact %s at %s for a later version of %s.\n\n",
new_extension->name,
extension_version_info->zend_extension_api_no,
ZEND_EXTENSION_API_NO,
new_extension->author,
new_extension->URL,
new_extension->name);
/* See http://support.microsoft.com/kb/190351 */
#ifdef PHP_WIN32
fflush(stderr);
#endif
DL_UNLOAD(handle);
return FAILURE;
}
} else if (strcmp(ZEND_EXTENSION_BUILD_ID, extension_version_info->build_id) &&
(!new_extension->build_id_check || new_extension->build_id_check(ZEND_EXTENSION_BUILD_ID) != SUCCESS)) {
fprintf(stderr, "Cannot load %s - it was built with configuration %s, whereas running engine is %s\n",
new_extension->name, extension_version_info->build_id, ZEND_EXTENSION_BUILD_ID);
/* See http://support.microsoft.com/kb/190351 */
#ifdef PHP_WIN32
fflush(stderr);
#endif
DL_UNLOAD(handle);
return FAILURE;
}

return zend_register_extension(new_extension, handle);
#else
fprintf(stderr, "Extensions are not supported on this platform.\n");
/* See http://support.microsoft.com/kb/190351 */
#ifdef PHP_WIN32
fflush(stderr);
#endif
return FAILURE;
#endif
}


int zend_register_extension(zend_extension *new_extension, DL_HANDLE handle)
{
#if ZEND_EXTENSIONS_SUPPORT
zend_extension extension;

extension = *new_extension;
extension.handle = handle;

zend_extension_dispatch_message(ZEND_EXTMSG_NEW_EXTENSION, &extension);

zend_llist_add_element(&zend_extensions, &extension);

/*fprintf(stderr, "Loaded %s, version %s\n", extension.name, extension.version);*/
#endif

return SUCCESS;
}


static void zend_extension_shutdown(zend_extension *extension TSRMLS_DC)
{
#if ZEND_EXTENSIONS_SUPPORT
if (extension->shutdown) {
extension->shutdown(extension);
}
#endif
}

static int zend_extension_startup(zend_extension *extension)
{
#if ZEND_EXTENSIONS_SUPPORT
if (extension->startup) {
if (extension->startup(extension)!=SUCCESS) {
return 1;
}
zend_append_version_info(extension);
}
#endif
return 0;
}


int zend_startup_extensions_mechanism()
{
/* Startup extensions mechanism */
zend_llist_init(&zend_extensions, sizeof(zend_extension), (void (*)(void *)) zend_extension_dtor, 1);
last_resource_number = 0;
return SUCCESS;
}


int zend_startup_extensions()
{
zend_llist_apply_with_del(&zend_extensions, (int (*)(void *)) zend_extension_startup);
return SUCCESS;
}


void zend_shutdown_extensions(TSRMLS_D)
{
zend_llist_apply(&zend_extensions, (llist_apply_func_t) zend_extension_shutdown TSRMLS_CC);
zend_llist_destroy(&zend_extensions);
}


void zend_extension_dtor(zend_extension *extension)
{
#if ZEND_EXTENSIONS_SUPPORT && !ZEND_DEBUG
if (extension->handle) {
DL_UNLOAD(extension->handle);
}
#endif
}


static void zend_extension_message_dispatcher(const zend_extension *extension, int num_args, va_list args TSRMLS_DC)
{
int message;
void *arg;

if (!extension->message_handler || num_args!=2) {
return;
}
message = va_arg(args, int);
arg = va_arg(args, void *);
extension->message_handler(message, arg);
}


ZEND_API void zend_extension_dispatch_message(int message, void *arg)
{
TSRMLS_FETCH();

zend_llist_apply_with_arguments(&zend_extensions, (llist_apply_with_args_func_t) zend_extension_message_dispatcher TSRMLS_CC, 2, message, arg);
}


ZEND_API int zend_get_resource_handle(zend_extension *extension)
{
if (last_resource_number<ZEND_MAX_RESERVED_RESOURCES) {
extension->resource_number = last_resource_number;
return last_resource_number++;
} else {
return -1;
}
}


ZEND_API zend_extension *zend_get_extension(const char *extension_name)
{
zend_llist_element *element;

for (element = zend_extensions.head; element; element = element->next) {
zend_extension *extension = (zend_extension *) element->data;

if (!strcmp(extension->name, extension_name)) {
return extension;
}
}
return NULL;
}

/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
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