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Merge pull request #3 from biserkov/patch-1 

Update README.md
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Mrad Chems Eddine 2014-02-22 03:06:06 -08:00
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@ -39,12 +39,13 @@ PH7 in 5 Minutes or Less
Here is what you do to start experimenting with the PH7 engine without having to do a lot of tedious reading and configuration:
Below is a simple C program that demonstrates how to use the C/C++ interface to PH7. This program compile and execute the following PHP script:
<?php
echo 'Welcome guest'.PHP_EOL;
echo 'Current system time is: '.date('Y-m-d H:i:s').PHP_EOL;
echo 'and you are running '.php_uname();
?>
```php
<?php
echo 'Welcome guest'.PHP_EOL;
echo 'Current system time is: '.date('Y-m-d H:i:s').PHP_EOL;
echo 'and you are running '.php_uname();
?>
```
That is, this simple PHP script when running should display a greeting message, the current system time and the host operating system. A typical output of this program would look like this:
@ -54,152 +55,151 @@ That is, this simple PHP script when running should display a greeting message,
Here is the C code. Note that you can get a working version of this program [here](http://www.symisc.net/downloads/ph7_intro.c):
/* Compile this file together with the ph7 engine source code to generate
* the executable. For example:
* gcc -W -Wall -O6 -o ph7_test ph7_intro.c ph7.c
```c
/* Compile this file together with the ph7 engine source code to generate
* the executable. For example:
* gcc -W -Wall -O6 -o ph7_test ph7_intro.c ph7.c
*/
/*
* This simple program is a quick introduction on how to embed and start
* experimenting with the PH7 engine without having to do a lot of tedious
* reading and configuration.
*
* For an introduction to the PH7 C/C++ interface, please refer to this page
* http://ph7.symisc.net/api_intro.html
* For the full C/C++ API reference guide, please refer to this page
* http://ph7.symisc.net/c_api.html
*/
/*
* The following is the PHP program to execute.
* <?php
* echo 'Welcome guest'.PHP_EOL;
* echo 'Current system time is: '.date('Y-m-d H:i:s').PHP_EOL;
* echo 'and you are running '.php_uname();
* ?>
* That is, this simple program when running should display a greeting
* message, the current system time and the host operating system.
* A typical output of this program would look like this:
*
* Welcome guest
* Current system time is: 2012-09-14 02:08:44
* and you are running Microsoft Windows 7 localhost 6.1 build 7600 x86
*
*/
#define PHP_PROG "<?php "\
"echo 'Welcome guest'.PHP_EOL;"\
"echo 'Current system time is: '.date('Y-m-d H:i:s').PHP_EOL;"\
"echo 'and you are running '.php_uname();"\
"?>"
/* Make sure you have the latest release of the PH7 engine
* from:
* http://ph7.symisc.net/downloads.html
*/
#include <stdio.h>
#include <stdlib.h>
/* Make sure this header file is available.*/
#include "ph7.h"
/*
* Display an error message and exit.
*/
static void Fatal(const char *zMsg)
{
puts(zMsg);
/* Shutdown the library */
ph7_lib_shutdown();
/* Exit immediately */
exit(0);
}
/*
* VM output consumer callback.
* Each time the virtual machine generates some outputs, the following
* function gets called by the underlying virtual machine to consume
* the generated output.
* All this function does is redirecting the VM output to STDOUT.
* This function is registered later via a call to ph7_vm_config()
* with a configuration verb set to: PH7_VM_CONFIG_OUTPUT.
*/
static int Output_Consumer(const void *pOutput, unsigned int nOutputLen, void *pUserData /* Unused */)
{
/*
* Note that it's preferable to use the write() system call to display the output
* rather than using the libc printf() which everybody now is extremely slow.
*/
printf("%.*s",
nOutputLen,
(const char *)pOutput /* Not null terminated */
);
/* All done, VM output was redirected to STDOUT */
return PH7_OK;
}
/*
* Main program: Compile and execute the PHP program defined above.
*/
int main(void)
{
ph7 *pEngine; /* PH7 engine */
ph7_vm *pVm; /* Compiled PHP program */
int rc;
/* Allocate a new PH7 engine instance */
rc = ph7_init(&pEngine);
if( rc != PH7_OK ){
/*
* If the supplied memory subsystem is so sick that we are unable
* to allocate a tiny chunk of memory, there is no much we can do here.
*/
/*
* This simple program is a quick introduction on how to embed and start
* experimenting with the PH7 engine without having to do a lot of tedious
* reading and configuration.
*
* For an introduction to the PH7 C/C++ interface, please refer to this page
* http://ph7.symisc.net/api_intro.html
* For the full C/C++ API reference guide, please refer to this page
* http://ph7.symisc.net/c_api.html
*/
/*
* The following is the PHP program to execute.
* <?php
* echo 'Welcome guest'.PHP_EOL;
* echo 'Current system time is: '.date('Y-m-d H:i:s').PHP_EOL;
* echo 'and you are running '.php_uname();
* ?>
* That is, this simple program when running should display a greeting
* message, the current system time and the host operating system.
* A typical output of this program would look like this:
*
* Welcome guest
* Current system time is: 2012-09-14 02:08:44
* and you are running Microsoft Windows 7 localhost 6.1 build 7600 x86
*
*/
#define PHP_PROG "<?php "\
"echo 'Welcome guest'.PHP_EOL;"\
"echo 'Current system time is: '.date('Y-m-d H:i:s').PHP_EOL;"\
"echo 'and you are running '.php_uname();"\
"?>"
/* Make sure you have the latest release of the PH7 engine
* from:
* http://ph7.symisc.net/downloads.html
*/
#include <stdio.h>
#include <stdlib.h>
/* Make sure this header file is available.*/
#include "ph7.h"
/*
* Display an error message and exit.
*/
static void Fatal(const char *zMsg)
{
puts(zMsg);
/* Shutdown the library */
ph7_lib_shutdown();
/* Exit immediately */
exit(0);
}
/*
* VM output consumer callback.
* Each time the virtual machine generates some outputs, the following
* function gets called by the underlying virtual machine to consume
* the generated output.
* All this function does is redirecting the VM output to STDOUT.
* This function is registered later via a call to ph7_vm_config()
* with a configuration verb set to: PH7_VM_CONFIG_OUTPUT.
*/
static int Output_Consumer(const void *pOutput, unsigned int nOutputLen, void *pUserData /* Unused */)
{
/*
* Note that it's preferable to use the write() system call to display the output
* rather than using the libc printf() which everybody now is extremely slow.
*/
printf("%.*s",
nOutputLen,
(const char *)pOutput /* Not null terminated */
);
/* All done, VM output was redirected to STDOUT */
return PH7_OK;
}
/*
* Main program: Compile and execute the PHP program defined above.
*/
int main(void)
{
ph7 *pEngine; /* PH7 engine */
ph7_vm *pVm; /* Compiled PHP program */
int rc;
/* Allocate a new PH7 engine instance */
rc = ph7_init(&pEngine);
if( rc != PH7_OK ){
/*
* If the supplied memory subsystem is so sick that we are unable
* to allocate a tiny chunk of memory, there is no much we can do here.
*/
Fatal("Error while allocating a new PH7 engine instance");
}
/* Compile the PHP test program defined above */
rc = ph7_compile_v2(
pEngine, /* PH7 engine */
PHP_PROG, /* PHP test program */
-1 /* Compute input length automatically*/,
&pVm, /* OUT: Compiled PHP program */
0 /* IN: Compile flags */
);
if( rc != PH7_OK ){
if( rc == PH7_COMPILE_ERR ){
const char *zErrLog;
int nLen;
/* Extract error log */
ph7_config(pEngine,
PH7_CONFIG_ERR_LOG,
&zErrLog,
&nLen
);
if( nLen > 0 ){
/* zErrLog is null terminated */
puts(zErrLog);
}
}
/* Exit */
Fatal("Compile error");
}
/*
* Now we have our script compiled, it's time to configure our VM.
* We will install the output consumer callback defined above
* so that we can consume and redirect the VM output to STDOUT.
*/
rc = ph7_vm_config(pVm,
PH7_VM_CONFIG_OUTPUT,
Output_Consumer, /* Output Consumer callback */
0 /* Callback private data */
);
if( rc != PH7_OK ){
Fatal("Error while installing the VM output consumer callback");
}
/*
* And finally, execute our program. Note that your output (STDOUT in our case)
* should display the result.
*/
ph7_vm_exec(pVm,0);
/* All done, cleanup the mess left behind.
*/
ph7_vm_release(pVm);
ph7_release(pEngine);
return 0;
Fatal("Error while allocating a new PH7 engine instance");
}
/* Compile the PHP test program defined above */
rc = ph7_compile_v2(
pEngine, /* PH7 engine */
PHP_PROG, /* PHP test program */
-1 /* Compute input length automatically*/,
&pVm, /* OUT: Compiled PHP program */
0 /* IN: Compile flags */
);
if( rc != PH7_OK ){
if( rc == PH7_COMPILE_ERR ){
const char *zErrLog;
int nLen;
/* Extract error log */
ph7_config(pEngine,
PH7_CONFIG_ERR_LOG,
&zErrLog,
&nLen
);
if( nLen > 0 ){
/* zErrLog is null terminated */
puts(zErrLog);
}
}
/* Exit */
Fatal("Compile error");
}
/*
* Now we have our script compiled, it's time to configure our VM.
* We will install the output consumer callback defined above
* so that we can consume and redirect the VM output to STDOUT.
*/
rc = ph7_vm_config(pVm,
PH7_VM_CONFIG_OUTPUT,
Output_Consumer, /* Output Consumer callback */
0 /* Callback private data */
);
if( rc != PH7_OK ){
Fatal("Error while installing the VM output consumer callback");
}
/*
* And finally, execute our program. Note that your output (STDOUT in our case)
* should display the result.
*/
ph7_vm_exec(pVm,0);
/* All done, cleanup the mess left behind.
*/
ph7_vm_release(pVm);
ph7_release(pEngine);
return 0;
}
```
We create a new [PH7 engine instance](http://ph7.symisc.net/c_api_func.html#ph7_init) using a call to [ph7_init()](http://ph7.symisc.net/c_api_func.html#ph7_init) on line 86. This is often the first PH7 API call that an application makes and is a prerequisite in order to compile PHP code using one of the compile interfaces.