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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* "find_java.exe", for Windows only.
* Tries to find a Java binary in a variety of places and prints the
* first one found on STDOUT and returns 0.
*
* If not found, returns error 1 with no message
* (unless ANDROID_SDKMAN_DEBUG or -d if set, in which case there's a message on STDERR).
*
* Implementation details:
* - We don't have access to ATL or MFC.
* - We don't want to pull in things like STL.
* - No Unicode/MBCS support for now.
*
* TODO for later version:
* - provide an env variable to let users override which version is being used.
* - if there's more than one java.exe found, enumerate them all.
* - and in that case take the one with the highest Java version number.
* - since that operation is expensive, do it only once and cache the result
* in a temp file. If the temp file is not found or the java binary no
* longer exists, re-run the enumaration.
*/
#ifdef _WIN32
#include "utils.h"
#include "find_java.h"
#include <io.h>
#include <fcntl.h>
static void testFindJava() {
CPath javaPath("<not found>");
int v = findJavaInEnvPath(&javaPath);
printf("findJavaInEnvPath: [%d] %s\n", v, javaPath.cstr());
javaPath.set("<not found>");
v = findJavaInRegistry(&javaPath);
printf("findJavaInRegistry [%d] %s\n", v, javaPath.cstr());
javaPath.set("<not found>");
v = findJavaInProgramFiles(&javaPath);
printf("findJavaInProgramFiles [%d] %s\n", v, javaPath.cstr());
}
int main(int argc, char* argv[]) {
gIsConsole = true; // tell utils to to print errors to stderr
gIsDebug = (getenv("ANDROID_SDKMAN_DEBUG") != NULL);
bool doShortPath = false;
bool doVersion = false;
bool doJavaW = false;
for (int i = 1; i < argc; i++) {
if (strncmp(argv[i], "-t", 2) == 0) {
testFindJava();
return 0;
} else if (strncmp(argv[i], "-d", 2) == 0) {
gIsDebug = true;
} else if (strncmp(argv[i], "-s", 2) == 0) {
doShortPath = true;
} else if (strncmp(argv[i], "-v", 2) == 0) {
doVersion = true;
} else if (strcmp(argv[i], "-w") == 0 || strcmp(argv[i], "-javaw") == 0) {
doJavaW = true;
} else {
printf(
"Outputs the path of the first Java.exe found on the local system.\n"
"Returns code 0 when found, 1 when not found.\n"
"Options:\n"
"-h / -help : This help.\n"
"-t / -test : Internal test.\n"
"-s / -short : Print path in short DOS form.\n"
"-w / -javaw : Search a matching javaw.exe; defaults to java.exe if not found.\n"
"-v / -version: Only prints the Java version found.\n"
);
return 2;
}
}
// Find the first suitable version of Java we can use.
CPath javaPath;
int version = findJavaInEnvPath(&javaPath);
if (version < MIN_JAVA_VERSION) {
version = findJavaInRegistry(&javaPath);
}
if (version < MIN_JAVA_VERSION) {
version = findJavaInProgramFiles(&javaPath);
}
if (version < MIN_JAVA_VERSION || javaPath.isEmpty()) {
if (gIsDebug) {
fprintf(stderr, "Failed to find Java on your system.\n");
}
return 1;
}
_ASSERT(!javaPath.isEmpty());
if (doShortPath) {
if (!javaPath.toShortPath(&javaPath)) {
fprintf(stderr,
"Failed to convert path to a short DOS path: %s\n",
javaPath.cstr());
return 1;
}
}
if (doVersion) {
// Print version found. We already have the version as an integer
// so we don't need to run java -version a second time.
printf("%d.%d", version / 1000, version % 1000);
return 0;
}
if (doJavaW) {
// Try to find a javaw.exe instead of java.exe at the same location.
CPath javawPath(javaPath);
javawPath.replaceName("java.exe", "javaw.exe");
// Only accept it if we can actually find the exec
PVOID oldWow64Value = disableWow64FsRedirection();
if (javawPath.fileExists()) {
javaPath.set(javawPath.cstr());
}
revertWow64FsRedirection(&oldWow64Value);
}
// Print java.exe path found
printf("%s", javaPath.cstr());
return 0;
}
#endif /* _WIN32 */
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