1 /*
   2  * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include "jni.h"
  27 #include "jni_util.h"
  28 #include "jvm.h"
  29 #include "java_io_Console.h"
  30 #include <stdlib.h>
  31 #include <sys/ioctl.h>
  32 #include <sys/resource.h>
  33 #include <unistd.h>
  34 #include <termios.h>
  35 
  36 JNIEXPORT jint JNICALL
  37 Java_java_io_Console_width(JNIEnv *env, jobject this)
  38 {
  39     struct winsize w;
  40 
  41     if (ioctl(0, TIOCGWINSZ, &w) == 0 || ioctl(1, TIOCGWINSZ, &w) == 0 || ioctl(2, TIOCGWINSZ, &w) == 0) {
  42         return w.ws_col;
  43     }
  44     return -1;
  45 }
  46 
  47 JNIEXPORT jint JNICALL
  48 Java_java_io_Console_height(JNIEnv *env, jobject this)
  49 {
  50     struct winsize w;
  51 
  52     if (ioctl(0, TIOCGWINSZ, &w) == 0 || ioctl(1, TIOCGWINSZ, &w) == 0 || ioctl(2, TIOCGWINSZ, &w) == 0) {
  53         return w.ws_row;
  54     }
  55     return -1;
  56 }
  57 
  58 JNIEXPORT jboolean JNICALL
  59 Java_java_io_Console_istty(JNIEnv *env, jclass cls)
  60 {
  61     return isatty(fileno(stdin)) && isatty(fileno(stdout));
  62 }
  63 
  64 JNIEXPORT jstring JNICALL
  65 Java_java_io_Console_encoding(JNIEnv *env, jclass cls)
  66 {
  67     return NULL;
  68 }
  69 
  70 JNIEXPORT jboolean JNICALL
  71 Java_java_io_Console_echo(JNIEnv *env,
  72                           jclass cls,
  73                           jboolean on)
  74 {
  75     struct termios tio;
  76     jboolean old;
  77     int tty = fileno(stdin);
  78     if (tcgetattr(tty, &tio) == -1) {
  79         JNU_ThrowIOExceptionWithLastError(env, "tcgetattr failed");
  80         return !on;
  81     }
  82     old = (tio.c_lflag & ECHO);
  83     if (on) {
  84         tio.c_lflag |= ECHO;
  85     } else {
  86         tio.c_lflag &= ~ECHO;
  87     }
  88     if (tcsetattr(tty, TCSANOW, &tio) == -1) {
  89         JNU_ThrowIOExceptionWithLastError(env, "tcsetattr failed");
  90     }
  91     return old;
  92 }