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#include <sys/types.h>
#include <stdbool.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
#include <limits.h>
#include <dlfcn.h>
#include <regex.h>
#include <stdio.h>
const int MIN_JVM_VERSION = 17;
int (*JLI_Launch)(int argc, char** argv,
int jargc, const char** jargv,
int appclassc, const char** appclassv,
const char* fullversion,
const char* dotversion,
const char* pname,
const char* lname,
unsigned char javaargs,
unsigned char cpwildcard,
unsigned char javaw,
int ergo);
char *find_openjdk_jli_pathname()
{
char *ret = NULL;
const struct dirent* entry = NULL;
bool oracle_jvm_found = false;
regex_t reg_java_version;
regex_t reg_implementor;
char pathname[PATH_MAX];
char line[1024];
char *jvm_dirname = NULL;
int jvm_version = INT_MAX;
DIR* dir = NULL;
dir = opendir("/usr/lib/jvm");
if (!dir) {
return NULL;
}
regcomp(®_java_version, "^\\s*JAVA_VERSION\\s*=\\s*\"(.*)\"\\s*$", REG_EXTENDED|REG_ICASE);
regcomp(®_implementor, "^\\s*IMPLEMENTOR\\s*=\\s*\"(.*)\"\\s*$", REG_EXTENDED|REG_ICASE);
while((entry = readdir(dir)) != NULL) {
if (entry->d_type == DT_DIR) {
const char *dirname = entry->d_name;
if ((strcmp(dirname, ".") == 0)||(strcmp(dirname, "..") == 0))
continue;
snprintf(pathname, sizeof(pathname), "/usr/lib/jvm/%s/release", dirname);
FILE *f = fopen(pathname, "r");
if (f == NULL) break;
char *implementor_str = NULL;
char *version_str = NULL;
while(fgets(line, sizeof(line), f)) {
if (implementor_str == NULL) {
regmatch_t matches[2];
int res = regexec(®_implementor, line, sizeof(matches) / sizeof(matches[0]), matches, 0);
if (res == 0) {
int size = matches[1].rm_eo - matches[1].rm_so;
implementor_str = malloc(size + 1);
if (implementor_str == NULL) break;
memcpy(implementor_str, line + matches[1].rm_so, size);
implementor_str[size] = '\0';
}
}
if (version_str == NULL) {
regmatch_t matches[2];
int res = regexec(®_java_version, line, sizeof(matches) / sizeof(matches[0]), matches, 0);
if (res == 0) {
int size = matches[1].rm_eo - matches[1].rm_so;
version_str = malloc(size + 1);
if (version_str == NULL) break;
memcpy(version_str, line + matches[1].rm_so, size);
version_str[size] = '\0';
}
}
if ((implementor_str != NULL)&&(version_str != NULL))
break;
}
if ((implementor_str != NULL)&&(version_str != NULL)) {
int version = atoi(version_str);
bool is_oracle_jvm = strcmp(implementor_str, "Oracle Corporation") == 0;
if ((is_oracle_jvm)&&(version >= MIN_JVM_VERSION)) {
if ((!oracle_jvm_found)||(version > jvm_version)) {
jvm_dirname = strdup(dirname);
jvm_version = version;
oracle_jvm_found = true;
}
} else {
if (((version >= MIN_JVM_VERSION)&&(version < jvm_version))||((version == MIN_JVM_VERSION)&&(!oracle_jvm_found))) {
if (jvm_dirname) free(jvm_dirname);
jvm_dirname = strdup(dirname);
jvm_version = version;
}
}
}
if (implementor_str) free(implementor_str);
if (version_str) free(version_str);
fclose(f);
}
}
regfree(®_java_version);
regfree(®_implementor);
if (jvm_dirname) {
snprintf(pathname, sizeof(pathname), "/usr/lib/jvm/%s/lib/libjli.so", jvm_dirname);
ret = strdup(pathname);
} else {
ret = strdup("/usr/lib/jvm/default/lib/libjli.so");
}
if (jvm_dirname) free(jvm_dirname);
closedir(dir);
return ret;
}
int main(int argc, char* argv[])
{
int ret = 0;
char *openjdk_jli_so_pathname = NULL;
char **jli_argv = NULL;
void *libjli_so = NULL;
int jli_argc = 0;
int size = 0;
openjdk_jli_so_pathname = find_openjdk_jli_pathname();
if (!openjdk_jli_so_pathname) {
fprintf(stderr, "No compatible(openjdk>=%d) Java runtime found!\n", MIN_JVM_VERSION);
ret = EXIT_FAILURE;
goto exit;
}
libjli_so = dlopen(openjdk_jli_so_pathname, RTLD_LAZY);
if (!libjli_so) {
fprintf(stderr, "Error: %s\n", dlerror());
ret = EXIT_FAILURE;
goto exit;
}
jli_argc = argc + 3;
size = jli_argc * sizeof(void*);
jli_argv = malloc(size);
if (jli_argv == NULL) {
fprintf(stderr, "Failed to allocate memory!\n");
ret = EXIT_FAILURE;
goto exit;
}
JLI_Launch = dlsym(libjli_so, "JLI_Launch");
if (!JLI_Launch) {
fprintf(stderr, "Error: %s\n", dlerror());
ret = EXIT_FAILURE;
goto exit;
}
jli_argv[0] = argv[0];
jli_argv[1] = "-jar";
jli_argv[2] = "-Dawt.useSystemAAFontSettings=on";
jli_argv[3] = "/usr/share/java/jd-gui/jd-gui.jar";
for(int c = 1; c < argc; c++)
jli_argv[c + 3] = argv[c];
ret = JLI_Launch(jli_argc, jli_argv,
0, NULL,
0, NULL,
ARCH_PKGVER "-" ARCH_PKGREL,
ARCH_PKGVER,
"jd-gui",
"jd-gui",
false,
false,
false,
0);
exit:
if (openjdk_jli_so_pathname)
free(openjdk_jli_so_pathname);
if (jli_argv)
free(jli_argv);
if (libjli_so)
dlclose(libjli_so);
return ret;
}
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