home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Programming Languages Suite
/
ProgLangD.iso
/
VCAFE.3.0A
/
Sample.bin
/
jre_md.c
< prev
next >
Wrap
C/C++ Source or Header
|
1998-09-15
|
7KB
|
272 lines
/*
* @(#)jre_md.c 1.7 98/07/01
*
* Copyright 1997, 1998 by Sun Microsystems, Inc.,
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
*
* This software is the confidential and proprietary information
* of Sun Microsystems, Inc. ("Confidential Information"). You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Sun.
*/
/*
* Win32 specific JRE support functions
*/
#include <windows.h>
#include <stdlib.h>
#include <jni.h>
#include "jre.h"
#define JRE_KEY "Software\\JavaSoft\\Java Runtime Environment"
#define JDK_KEY "Software\\JavaSoft\\Java Development Kit"
#define RUNTIME_LIB "javai.dll"
/* From jre_main.c */
extern jboolean debug;
/* Forward Declarations */
jint LoadSettings(JRESettings *set, HKEY key);
jint GetSettings(JRESettings *set, const char *version, const char *keyname);
char *GetStringValue(HKEY key, const char *name);
/*
* Retrieve settings from registry for current runtime version. Returns
* 0 if successful otherwise returns -1 if no installed runtime was found
* or the registry data was invalid.
*/
jint
JRE_GetCurrentSettings(JRESettings *set)
{
jint r = -1;
HKEY key;
if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, JRE_KEY, 0, KEY_READ, &key) == 0) {
char *ver = GetStringValue(key, "CurrentVersion");
if (ver != 0) {
r = JRE_GetSettings(set, ver);
}
free(ver);
RegCloseKey(key);
}
return r;
}
/*
* Retrieves settings from registry for specified runtime version.
* Searches for either installed JRE and JDK runtimes. Returns 0 if
* successful otherwise returns -1 if requested version of runtime
* could not be found.
*/
jint
JRE_GetSettings(JRESettings *set, const char *version)
{
if (GetSettings(set, version, JRE_KEY) != 0) {
return GetSettings(set, version, JDK_KEY);
}
return 0;
}
jint
GetSettings(JRESettings *set, const char *version, const char *keyname)
{
HKEY key;
int r = -1;
if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &key) == 0) {
char *major, *minor, *micro = 0;
if (JRE_ParseVersion(version, &major, &minor, µ) == 0) {
HKEY subkey;
char *ver = JRE_MakeVersion(major, minor, 0);
set->majorVersion = major;
set->minorVersion = minor;
if (RegOpenKeyEx(key, ver, 0, KEY_READ, &subkey) == 0) {
if ((r = LoadSettings(set, subkey)) == 0) {
if (micro != 0) {
if (set->microVersion == 0 ||
strcmp(micro, set->microVersion) != 0) {
r = -1;
}
}
}
RegCloseKey(subkey);
}
free(ver);
}
RegCloseKey(key);
}
return r;
}
/*
* Load runtime settings from specified registry key. Returns 0 if
* successful otherwise -1 if the registry data was invalid.
*/
static jint
LoadSettings(JRESettings *set, HKEY key)
{
/* Full path name of JRE home directory (required) */
set->javaHome = GetStringValue(key, "JavaHome");
if (set->javaHome == 0) {
return -1;
}
/* Full path name of JRE runtime DLL */
set->runtimeLib = GetStringValue(key, "RuntimeLib");
if (set->runtimeLib == 0) {
set->runtimeLib = JRE_GetDefaultRuntimeLib(set->javaHome);
}
/* Class path setting to override default */
set->classPath = GetStringValue(key, "ClassPath");
if (set->classPath == 0) {
set->classPath = JRE_GetDefaultClassPath(set->javaHome);
}
/* Optional JIT compiler library name */
set->compiler = GetStringValue(key, "Compiler");
/* Release micro-version */
set->microVersion = GetStringValue(key, "MicroVersion");
return 0;
}
/*
* Returns string data for the specified registry value name, or
* NULL if not found.
*/
static char *
GetStringValue(HKEY key, const char *name)
{
DWORD type, size;
char *value = 0;
if (RegQueryValueEx(key, name, 0, &type, 0, &size) == 0 &&
type == REG_SZ ) {
value = JRE_Malloc(size);
if (RegQueryValueEx(key, name, 0, 0, value, &size) != 0) {
free(value);
value = 0;
}
}
return value;
}
/*
* Returns default runtime settings based on location of this program.
* Makes best attempt at determining location of runtime. Returns 0
* if successful or -1 if a runtime could not be found.
*/
jint
JRE_GetDefaultSettings(JRESettings *set)
{
char buf[MAX_PATH], *bp;
int n;
// Try to obtain default value for Java home directory based on
// location of this executable.
if ((n = GetModuleFileName(0, buf, MAX_PATH)) == 0) {
return -1;
}
bp = buf + n;
while (*--bp != '\\') ;
bp -= 4;
if (bp < buf || strnicmp(bp, "\\bin", 4) != 0) {
return -1;
}
*bp = '\0';
set->javaHome = strdup(buf);
// Get default runtime library
set->runtimeLib = JRE_GetDefaultRuntimeLib(set->javaHome);
// Get default class path
set->classPath = JRE_GetDefaultClassPath(set->javaHome);
// Reset other fields since these are unknown
set->compiler = 0;
set->majorVersion = 0;
set->minorVersion = 0;
set->microVersion = 0;
return 0;
}
/*
* Return default runtime library for specified Java home directory.
*/
char *
JRE_GetDefaultRuntimeLib(const char *dir)
{
char *cp = JRE_Malloc(strlen(dir) + sizeof(RUNTIME_LIB) + 8);
sprintf(cp, "%s\\bin\\" RUNTIME_LIB, dir);
return cp;
}
/*
* Return default class path for specified Java home directory.
*/
char *
JRE_GetDefaultClassPath(const char *dir)
{
char *cp = JRE_Malloc(strlen(dir) * 4 + 64);
sprintf(cp, "%s\\lib\\rt.jar;%s\\lib\\i18n.jar;%s\\lib\\classes.zip;"
"%s\\classes", dir, dir, dir, dir);
return cp;
}
/*
* Loads the runtime library corresponding to 'libname' and returns
* an opaque handle to the library.
*/
void *
JRE_LoadLibrary(const char *path)
{
return (void *)LoadLibrary(path);
}
/*
* Unloads the runtime library associated with handle.
*/
void
JRE_UnloadLibrary(void *handle)
{
FreeLibrary(handle);
}
/*
* Loads default VM args for the specified runtime library handle.
*/
jint
JRE_GetDefaultJavaVMInitArgs(void *handle, void *vmargs)
{
FARPROC proc = GetProcAddress(handle, "JNI_GetDefaultJavaVMInitArgs");
return proc != 0 ? ((*proc)(vmargs), 0) : -1;
}
/*
* Creates a Java VM for the specified runtime library handle.
*/
jint
JRE_CreateJavaVM(void *handle, JavaVM **vmp, JNIEnv **envp, void *vmargs)
{
FARPROC proc = GetProcAddress(handle, "JNI_CreateJavaVM");
return proc != 0 ? (*proc)(vmp, envp, vmargs) : -1;
}
/*
* Entry point for JREW (Windows-only) version of the runtime loader.
* This entry point is called when the '-subsystem:windows' linker
* option is used, and will cause the resulting executable to run
* detached from the console.
*/
int WINAPI
WinMain(HINSTANCE inst, HINSTANCE prevInst, LPSTR cmdLine, int cmdShow)
{
__declspec(dllimport) char **__initenv;
__initenv = _environ;
exit(main(__argc, __argv));
}