1 files changed, 51 insertions, 0 deletions
diff --git a/toolkit/crashreporter/nsExceptionHandlerUtils.cpp b/toolkit/crashreporter/nsExceptionHandlerUtils.cpp
new file mode 100644
index 0000000000..e7f70e599b
--- /dev/null
+++ b/toolkit/crashreporter/nsExceptionHandlerUtils.cpp
@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsExceptionHandlerUtils.h"
+
+#include <algorithm>
+
+#include "double-conversion/double-conversion.h"
+
+// Format a non-negative double to a string, without using C-library functions,
+// which need to be avoided (.e.g. bug 1240160, comment 10).  Return false if
+// we failed to get the formatting done correctly.
+bool SimpleNoCLibDtoA(double aValue, char* aBuffer, int aBufferLength) {
+  // aBufferLength is the size of the buffer.  Be paranoid.
+  aBuffer[aBufferLength - 1] = '\0';
+
+  if (aValue < 0) {
+    return false;
+  }
+
+  int length, point, i;
+  bool sign;
+  bool ok = true;
+  double_conversion::DoubleToStringConverter::DoubleToAscii(
+      aValue, double_conversion::DoubleToStringConverter::SHORTEST, 8, aBuffer,
+      aBufferLength, &sign, &length, &point);
+
+  // length does not account for the 0 terminator.
+  if (length > point && (length + 1) < (aBufferLength - 1)) {
+    // We have to insert a decimal point.  Not worried about adding a leading
+    // zero in the < 1 (point == 0) case.
+    aBuffer[length + 1] = '\0';
+    for (i = length; i > std::max(point, 0); i -= 1) {
+      aBuffer[i] = aBuffer[i - 1];
+    }
+    aBuffer[i] = '.';  // Not worried about locales
+  } else if (length < point) {
+    // Trailing zeros scenario
+    for (i = length; i < point; i += 1) {
+      if (i >= aBufferLength - 2) {
+        ok = false;
+      }
+      aBuffer[i] = '0';
+    }
+    aBuffer[i] = '\0';
+  }
+  return ok;
+}