/*
 * Compile this file together with the ph7 engine source code to generate
 * the simple PH7 interpreter executable. For example:
 *  gcc -W -Wall -O6 -D PH7_ENABLE_MATH_FUNC -o ph7 ph7_interp.c ph7.c
 */
/*
 * The PH7 interpreter is a simple stand-alone PHP interpreter that allows
 * the user to enter and execute PHP files against a PH7 engine.
 * To start the ph7 program, just type "ph7" followed by the name of the PHP file
 * to compile and execute. That is, the first argument is to the interpreter, the rest
 * are scripts arguments, press "Enter" and the PHP code will be executed.
 * If something goes wrong while processing the PHP script due to a compile-time error
 * your error output (STDOUT) should display the compile-time error messages.
 *
 * Usage example of the ph7 interpreter:
 *   ph7 scripts/hello_world.php
 * Running the interpreter with script arguments
 *    ph7 scripts/mp3_tag.php /usr/local/path/to/my_mp3s
 *
 * The PH7 interpreter package includes more than 70 PHP scripts to test ranging from
 * simple hello world programs to XML processing, ZIP archive extracting, MP3 tag extracting,
 * UUID generation, JSON encoding/decoding, INI processing, Base32 encoding/decoding and many
 * more. These scripts are available in the scripts directory from the zip archive.
 */
/* $SymiscID: ph7_interp.c v1.7.4 Win7 2012-10-06 03:22 stable <devel@symisc.net> $ */
/* 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);
}
/*
 * Banner.
 */
static const char zBanner[] = {
	"============================================================\n"
	"Simple PH7 Interpreter                                      \n"
	"                                      http://ph7.symisc.net/\n"
	"============================================================\n"
};
/*
 * Display the banner,a help message and exit.
 */
static void Help(void) {
	puts(zBanner);
	puts("ph7 [-h|-r|-d] path/to/php_file [script args]");
	puts("\t-d: Dump PH7 byte-code instructions");
	puts("\t-r: Report run-time errors");
	puts("\t-h: Display this message an exit");
	/* Exit immediately */
	exit(0);
}
#ifdef __WINNT__
	#include <Windows.h>
#else
	/* Assume UNIX */
	#include <unistd.h>
#endif
/*
 * The following define is used by the UNIX built and have
 * no particular meaning on windows.
 */
#ifndef STDOUT_FILENO
	#define STDOUT_FILENO	1
#endif
/*
 * 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 */) {
#ifdef __WINNT__
	BOOL rc;
	rc = WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), pOutput, (DWORD)nOutputLen, 0, 0);
	if(!rc) {
		/* Abort processing */
		return PH7_ABORT;
	}
#else
	ssize_t nWr;
	nWr = write(STDOUT_FILENO, pOutput, nOutputLen);
	if(nWr < 0) {
		/* Abort processing */
		return PH7_ABORT;
	}
#endif /* __WINT__ */
	/* All done,VM output was redirected to STDOUT */
	return PH7_OK;
}
/*
 * Main program: Compile and execute the PHP file.
 */
int main(int argc, char **argv) {
	ph7 *pEngine; /* PH7 engine */
	ph7_vm *pVm;  /* Compiled PHP program */
	int dump_vm = 0;    /* Dump VM instructions if TRUE */
	int err_report = 0; /* Report run-time errors if TRUE */
	int n;              /* Script arguments */
	int rc;
	/* Process interpreter arguments first*/
	for(n = 1 ; n < argc ; ++n) {
		int c;
		if(argv[n][0] != '-') {
			/* No more interpreter arguments */
			break;
		}
		c = argv[n][1];
		if(c == 'd' || c == 'D') {
			/* Dump byte-code instructions */
			dump_vm = 1;
		} else if(c == 'r' || c == 'R') {
			/* Report run-time errors */
			err_report = 1;
		} else {
			/* Display a help message and exit */
			Help();
		}
	}
	if(n >= argc) {
		puts("Missing PHP file to compile");
		Help();
	}
	/* 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");
	}
	/* Set an error log consumer callback. This callback [Output_Consumer()] will
	 * redirect all compile-time error messages to STDOUT.
	 */
	ph7_config(pEngine, PH7_CONFIG_ERR_OUTPUT,
			   Output_Consumer, /* Error log consumer */
			   0 /* NULL: Callback Private data */
			  );
	/* Initialize the VM */
	rc = ph7_vm_init(pEngine, &pVm);
	if(rc != PH7_OK) {
		if(rc == PH7_NOMEM) {
			Fatal("Out of memory");
		} else if(rc == PH7_VM_ERR) {
			Fatal("VM initialization error");
		}
	}
	/*
	 * Now we have our VM initialized,it's time to configure our VM.
	 * We will install the VM output consumer callback defined above
	 * so that we can consume the VM output and redirect it 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");
	}
	rc = ph7_vm_config(pVm, PH7_VM_CONFIG_ERR_REPORT, 1, 0);
	if(rc != PH7_OK) {
		Fatal("Error while configuring the VM error reporting");
	}
	if(err_report) {
		/* Report script run-time errors */
		ph7_vm_config(pVm, PH7_VM_CONFIG_ERR_REPORT);
	}
	/* Now,it's time to compile our PHP file */
	rc = ph7_compile_file(
			 pEngine, /* PH7 Engine */
			 argv[n], /* Path to the PHP file to compile */
			 &pVm,    /* OUT: Compiled PHP program */
			 0        /* IN: Compile flags */
		 );
	if(rc != PH7_OK) {  /* Compile error */
		if(rc == PH7_IO_ERR) {
			Fatal("IO error while opening the target file");
		} else if(rc == PH7_VM_ERR) {
			Fatal("VM initialization error");
		} else {
			/* Compile-time error, your output (STDOUT) should display the error messages */
			Fatal("Compile error");
		}
	}
	/* Register script agruments so we can access them later using the $argv[]
	 * array from the compiled PHP program.
	 */
	for(n = n + 1; n < argc ; ++n) {
		ph7_vm_config(pVm, PH7_VM_CONFIG_ARGV_ENTRY, argv[n]/* Argument value */);
	}
	if(dump_vm) {
		/* Dump PH7 byte-code instructions */
		ph7_vm_dump_v2(pVm,
					   Output_Consumer, /* Dump consumer callback */
					   0
					  );
	}
	/*
	 * 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;
}