#include <jni.h>
#include "EnvarJni.h"
#include <tchar.h>
#include <windows.h>
#define BUFSIZE 1024

JNIEXPORT jstring JNICALL 
  Java_EnvarJni_getEnvar (JNIEnv *env, jobject obj, jstring var)
 {
  DWORD charsret;
  char buf[BUFSIZE];
  size_t bufcnt = sizeof buf / sizeof(char) ;

  const char *str = (*env)->GetStringUTFChars(env, var, 0);
  charsret = GetEnvironmentVariable(str, buf, BUFSIZE) ;
  (*env)->ReleaseStringUTFChars(env, var, str);
  if(charsret ==0)
   return (*env)->NewStringUTF(env, "Environment Variable Not Found");
  else
   if(charsret > bufcnt)
   return (*env)->NewStringUTF(env, "Buffer too small for environment variable");
  else
   return (*env)->NewStringUTF(env, buf);
}