- Remove the legacy debug protocol.

runtime/platform/text_buffer.cc

Index: runtime/platform/text_buffer.cc
diff --git a/runtime/platform/text_buffer.cc b/runtime/platform/text_buffer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b9c6ac7515bee735dc004f2deb3b71d75e462ec3
--- /dev/null
+++ b/runtime/platform/text_buffer.cc
@@ -0,0 +1,157 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "platform/text_buffer.h"
+
+#include "platform/assert.h"
+#include "platform/globals.h"
+#include "platform/utils.h"
+#include "vm/os.h"
+
+namespace dart {
+
+TextBuffer::TextBuffer(intptr_t buf_size) {
+  ASSERT(buf_size > 0);
+  buf_ = reinterpret_cast<char*>(malloc(buf_size));
+  buf_size_ = buf_size;
+  Clear();
+}
+
+
+TextBuffer::~TextBuffer() {
+  free(buf_);
+  buf_ = NULL;
+}
+
+
+void TextBuffer::Clear() {
+  msg_len_ = 0;
+  buf_[0] = '\0';
+}
+
+
+const char* TextBuffer::Steal() {
+  const char* r = buf_;
+  buf_ = NULL;
+  buf_size_ = 0;
+  msg_len_ = 0;
+  return r;
+}
+
+
+void TextBuffer::AddChar(char ch) {
+  EnsureCapacity(sizeof(ch));
+  buf_[msg_len_] = ch;
+  msg_len_++;
+  buf_[msg_len_] = '\0';
+}
+
+
+intptr_t TextBuffer::Printf(const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  intptr_t remaining = buf_size_ - msg_len_;
+  ASSERT(remaining >= 0);
+  intptr_t len = OS::VSNPrint(buf_ + msg_len_, remaining, format, args);
+  va_end(args);
+  if (len >= remaining) {
+    EnsureCapacity(len);
+    remaining = buf_size_ - msg_len_;
+    ASSERT(remaining > len);
+    va_list args2;
+    va_start(args2, format);
+    intptr_t len2 = OS::VSNPrint(buf_ + msg_len_, remaining, format, args2);
+    va_end(args2);
+    ASSERT(len == len2);
+  }
+  msg_len_ += len;
+  buf_[msg_len_] = '\0';
+  return len;
+}
+
+
+// Write a UTF-16 code unit so it can be read by a JSON parser in a string
+// literal. Use escape sequences for characters other than printable ASCII.
+void TextBuffer::EscapeAndAddCodeUnit(uint32_t codeunit) {
+  switch (codeunit) {
+    case '"':
+      Printf("%s", "\\\"");
+      break;
+    case '\\':
+      Printf("%s", "\\\\");
+      break;
+    case '/':
+      Printf("%s", "\\/");
+      break;
+    case '\b':
+      Printf("%s", "\\b");
+      break;
+    case '\f':
+      Printf("%s", "\\f");
+      break;
+    case '\n':
+      Printf("%s", "\\n");
+      break;
+    case '\r':
+      Printf("%s", "\\r");
+      break;
+    case '\t':
+      Printf("%s", "\\t");
+      break;
+    default:
+      if (codeunit < 0x20) {
+        // Encode character as \u00HH.
+        uint32_t digit2 = (codeunit >> 4) & 0xf;
+        uint32_t digit3 = (codeunit & 0xf);
+        Printf("\\u00%c%c",
+               digit2 > 9 ? 'A' + (digit2 - 10) : '0' + digit2,
+               digit3 > 9 ? 'A' + (digit3 - 10) : '0' + digit3);
+      } else if (codeunit > 127) {
+        // Encode character as \uHHHH.
+        uint32_t digit0 = (codeunit >> 12) & 0xf;
+        uint32_t digit1 = (codeunit >> 8) & 0xf;
+        uint32_t digit2 = (codeunit >> 4) & 0xf;
+        uint32_t digit3 = (codeunit & 0xf);
+        Printf("\\u%c%c%c%c",
+               digit0 > 9 ? 'A' + (digit0 - 10) : '0' + digit0,
+               digit1 > 9 ? 'A' + (digit1 - 10) : '0' + digit1,
+               digit2 > 9 ? 'A' + (digit2 - 10) : '0' + digit2,
+               digit3 > 9 ? 'A' + (digit3 - 10) : '0' + digit3);
+      } else {
+        AddChar(codeunit);
+      }
+  }
+}
+
+
+void TextBuffer::AddString(const char* s) {
+  Printf("%s", s);
+}
+
+
+void TextBuffer::AddEscapedString(const char* s) {
+  intptr_t len = strlen(s);
+  for (int i = 0; i < len; i++) {
+    EscapeAndAddCodeUnit(s[i]);
+  }
+}
+
+
+void TextBuffer::EnsureCapacity(intptr_t len) {
+  intptr_t remaining = buf_size_ - msg_len_;
+  if (remaining <= len) {
+    const int kBufferSpareCapacity = 64;  // Somewhat arbitrary.
+    // TODO(turnidge): do we need to guard against overflow or other
+    // security issues here? Text buffers are used by the debugger
+    // to send user-controlled data (e.g. values of string variables) to
+    // the debugger front-end.
+    intptr_t new_size = buf_size_ + len + kBufferSpareCapacity;
+    char* new_buf = reinterpret_cast<char*>(realloc(buf_, new_size));
+    ASSERT(new_buf != NULL);
+    buf_ = new_buf;
+    buf_size_ = new_size;
+  }
+}
+
+}  // namespace dart