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|
/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2004 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.0 of the PHP 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.php.net/license/3_0.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Ard Biesheuvel <a.k.biesheuvel@ewi.tudelft.nl> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
/**
* This UDF library adds the ability to call PHP functions from SQL
* statements. You will have to declare a different external function for
* each number of parameters you require. Currently, only string arguments
* are supported as input, the output can be numeric as well.
*
* Declare the functions like this:
*
* DECLARE EXTERNAL FUNCTION CALL_PHP1
* CSTRING(xx),<type> BY DESCRIPTOR, CSTRING(xx)
* RETURNS PARAMETER 2
* ENTRY_POINT 'udf_call_php1' MODULE_NAME 'php_ibase_udf'
*
* DECLARE EXTERNAL FUNCTION CALL_PHP2
* CSTRING(xx),<type> BY DESCRIPTOR, CSTRING(xx), CSTRING(xx)
* RETURNS PARAMETER 2
* ENTRY_POINT 'udf_call_php2' MODULE_NAME 'php_ibase_udf'
*
* ... and so on.
*
* The first input parameter contains the function you want to call. The
* second argument is the result, and should not be passed as an argument.
* Subsequent arguments are passed to the called function. The lengths of
* the input strings can have any value >1. The type and length of the
* output depends on its declaration.
*
* The declared functions can be called from SQL like:
*
* SELECT CALL_PHP1('strtolower',rdb$relation_name) FROM rdb$relations
*
* THIS UDF WILL ONLY WORK IF YOU ARE RUNNING THE EMBEDDED 'CLASSIC' SERVER
* IN-PROCESS WITH YOUR PHP ENGINE. NETWORK CONNECTIONS TO 'LOCALHOST' ARE
* NOT SUPPORTED.
*
* Compile with:
* gcc -shared `php-config --includes` `php-config --ldflags` \
* -o php_ibase_udf.so php_ibase_udf.c
*
* and copy the resulting file to the folder where your database expects
* to find its UDFs.
*/
#include "zend.h"
#include "zend_API.h"
#include "php.h"
#include "stdarg.h"
#include "ib_util.h"
#include "ibase.h"
#ifdef ZTS
#error This functionality is not available in ZTS mode
#endif
#define min(a,b) ((a)<(b)?(a):(b))
static void call_php(char *name, PARAMDSC *r, int argc, ...)
{
zval callback, args[4], *argp[4], return_value;
va_list va;
int i;
PARAMVARY *res = (PARAMVARY*)(r->dsc_address);
INIT_ZVAL(callback);
ZVAL_STRING(&callback,name,0);
do {
/* check if the requested function exists */
if (!zend_is_callable(&callback, 0, NULL)) {
break;
}
va_start(va, argc);
/* create the argument array */
for (i = 0; i < argc; ++i) {
char *arg = va_arg(va, char*);
INIT_ZVAL(args[i]);
ZVAL_STRING(argp[i] = &args[i], arg, 0);
}
va_end(va);
/* now call the function */
if (FAILURE == call_user_function(EG(function_table), NULL,
&callback, &return_value, argc, argp)) {
break;
}
switch (Z_TYPE(return_value)) {
case IS_LONG:
r->dsc_dtype = dtype_long;
*(long*)r->dsc_address = Z_LVAL(return_value);
r->dsc_length = sizeof(long);
break;
case IS_DOUBLE:
r->dsc_dtype = dtype_double;
*(double*)r->dsc_address = Z_DVAL(return_value);
r->dsc_length = sizeof(double);
break;
default:
convert_to_string(&return_value);
case IS_STRING:
r->dsc_dtype = dtype_varying;
memcpy(res->vary_string, Z_STRVAL(return_value),
(res->vary_length = min(r->dsc_length-2,Z_STRLEN(return_value))));
r->dsc_length = res->vary_length+2;
break;
}
zval_dtor(&return_value);
return;
} while (0);
/**
* If we end up here, we should report an error back to the DB engine, but
* that's not possible. We can however report it back to PHP.
*/
php_error_docref(NULL, E_WARNING, "Error calling function '%s' from database", name);
}
void udf_call_php1(char *name, PARAMDSC *r, char *arg1)
{
call_php(name, r, 1, arg1);
}
void udf_call_php2(char *name, PARAMDSC *r, char *arg1, char *arg2)
{
call_php(name, r, 2, arg1, arg2);
}
void udf_call_php3(char *name, PARAMDSC *r, char *arg1, char *arg2, char *arg3)
{
call_php(name, r, 3, arg1, arg2, arg3);
}
void udf_call_php4(char *name, PARAMDSC *r, char *arg1, char *arg2, char *arg3, char *arg4)
{
call_php(name, r, 4, arg1, arg2, arg3, arg4);
}
|
