Bridge library to the 1.5 format

libraries/Bridge/src/Process.cpp

@@ -0,0 +1,142 @@
+/*
+  Copyright (c) 2013 Arduino LLC. All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+*/
+
+#include <Process.h>
+
+Process::~Process() {
+  close();
+}
+
+size_t Process::write(uint8_t c) {
+  uint8_t cmd[] = {'I', handle, c};
+  bridge.transfer(cmd, 3);
+  return 1;
+}
+
+void Process::flush() {
+}
+
+int Process::available() {
+  // Look if there is new data available
+  doBuffer();
+  return buffered;
+}
+
+int Process::read() {
+  doBuffer();
+  if (buffered == 0)
+    return -1; // no chars available
+  else {
+    buffered--;
+    return buffer[readPos++];
+  }
+}
+
+int Process::peek() {
+  doBuffer();
+  if (buffered == 0)
+    return -1; // no chars available
+  else
+    return buffer[readPos];
+}
+
+void Process::doBuffer() {
+  // If there are already char in buffer exit
+  if (buffered > 0)
+    return;
+
+  // Try to buffer up to 32 characters
+  readPos = 0;
+  uint8_t cmd[] = {'O', handle, sizeof(buffer)};
+  buffered = bridge.transfer(cmd, 3, buffer, sizeof(buffer));
+}
+
+void Process::begin(const String &command) {
+  close();
+  cmdline = new String(command);
+}
+
+void Process::addParameter(const String &param) {
+  *cmdline += "\xFE";
+  *cmdline += param;
+}
+
+void Process::runAsynchronously() {
+  uint8_t cmd[] = {'R'};
+  uint8_t res[2];
+  bridge.transfer(cmd, 1, (uint8_t*)cmdline->c_str(), cmdline->length(), res, 2);
+  handle = res[1];
+
+  delete cmdline;
+  cmdline = NULL;
+  
+  if (res[0]==0) // res[0] contains error code
+    started = true;
+}
+
+boolean Process::running() {
+  uint8_t cmd[] = {'r', handle};
+  uint8_t res[1];
+  bridge.transfer(cmd, 2, res, 1);
+  return (res[0] == 1);
+}
+
+unsigned int Process::exitValue() {
+  uint8_t cmd[] = {'W', handle};
+  uint8_t res[2];
+  bridge.transfer(cmd, 2, res, 2);
+  return (res[0] << 8) + res[1];
+}
+
+unsigned int Process::run() {
+  runAsynchronously();
+  while (running())
+    delay(100);
+  return exitValue();
+}
+
+void Process::close() {
+  if (started) {
+    uint8_t cmd[] = {'w', handle};
+    bridge.transfer(cmd, 2);
+  }
+  started = false;
+}
+
+unsigned int Process::runShellCommand(const String &command) {
+  runShellCommandAsynchronously(command);
+  while (running())
+    delay(100);
+  return exitValue();
+}
+
+void Process::runShellCommandAsynchronously(const String &command) {
+  begin("/bin/ash");
+  addParameter("-c");
+  addParameter(command);
+  runAsynchronously();
+}
+
+// This method is currently unused
+//static unsigned int __commandOutputAvailable(uint8_t handle) {
+//  uint8_t cmd[] = {'o', handle};
+//  uint8_t res[1];
+//  Bridge.transfer(cmd, 2, res, 1);
+//  return res[0];
+//}
+