#include "NewtCommon.h" #include <string.h> static const char * const ClazzNameRuntimeException = "java/lang/RuntimeException"; static jclass runtimeExceptionClz=NULL; void NewtCommon_FatalError(JNIEnv *env, const char* msg, ...) { char buffer[512]; va_list ap; va_start(ap, msg); vsnprintf(buffer, sizeof(buffer), msg, ap); va_end(ap); fprintf(stderr, "%s\n", buffer); (*env)->FatalError(env, buffer); } void NewtCommon_throwNewRuntimeException(JNIEnv *env, const char* msg, ...) { char buffer[512]; va_list ap; va_start(ap, msg); vsnprintf(buffer, sizeof(buffer), msg, ap); va_end(ap); (*env)->ThrowNew(env, runtimeExceptionClz, buffer); } void NewtCommon_init(JNIEnv *env) { if(NULL==runtimeExceptionClz) { jclass c = (*env)->FindClass(env, ClazzNameRuntimeException); if(NULL==c) { NewtCommon_FatalError(env, "NEWT: can't find %s", ClazzNameRuntimeException); } runtimeExceptionClz = (jclass)(*env)->NewGlobalRef(env, c); (*env)->DeleteLocalRef(env, c); if(NULL==runtimeExceptionClz) { NewtCommon_FatalError(env, "NEWT: can't use %s", ClazzNameRuntimeException); } } } const char * NewtCommon_GetStaticStringMethod(JNIEnv *jniEnv, jclass clazz, jmethodID jGetStrID, char *dest, int destSize, const char *altText) { if(NULL != jniEnv && NULL != clazz && NULL != jGetStrID) { jstring jstr = (jstring) (*jniEnv)->CallStaticObjectMethod(jniEnv, clazz, jGetStrID); if(NULL != jstr) { const char * str = (*jniEnv)->GetStringUTFChars(jniEnv, jstr, NULL); if( NULL != str) { strncpy(dest, str, destSize-1); dest[destSize-1] = 0; // EOS (*jniEnv)->ReleaseStringUTFChars(jniEnv, jstr, str); return dest; } } } strncpy(dest, altText, destSize-1); dest[destSize-1] = 0; // EOS return dest; } jchar* NewtCommon_GetNullTerminatedStringChars(JNIEnv* env, jstring str) { jchar* strChars = NULL; strChars = calloc((*env)->GetStringLength(env, str) + 1, sizeof(jchar)); if (strChars != NULL) { (*env)->GetStringRegion(env, str, 0, (*env)->GetStringLength(env, str), strChars); } return strChars; } JNIEnv* NewtCommon_GetJNIEnv(JavaVM * jvmHandle, int jvmVersion, int * shallBeDetached) { JNIEnv* curEnv = NULL; JNIEnv* newEnv = NULL; int envRes; // retrieve this thread's JNIEnv curEnv - or detect it's detached envRes = (*jvmHandle)->GetEnv(jvmHandle, (void **) &curEnv, jvmVersion) ; if( JNI_EDETACHED == envRes ) { // detached thread - attach to JVM if( JNI_OK != ( envRes = (*jvmHandle)->AttachCurrentThread(jvmHandle, (void**) &newEnv, NULL) ) ) { fprintf(stderr, "JNIEnv: can't attach thread: %d\n", envRes); return NULL; } curEnv = newEnv; } else if( JNI_OK != envRes ) { // oops .. fprintf(stderr, "can't GetEnv: %d\n", envRes); return NULL; } if (curEnv==NULL) { fprintf(stderr, "env is NULL\n"); return NULL; } *shallBeDetached = NULL != newEnv; return curEnv; }