Fix process's output to stdout/stderr (MI)

Summary:
* Add CMIUtilString::Escape/Unescape methods (MI)
* Fix process's output to stdout/stderr (MI):
lldb-mi escapes process's output to show it in the following format:
```
~"..."
```

But previously not all characters were escaped by CMICmnLLDBDebuggerHandleEvents::ConvertPrintfCtrlCodeToString and output of
```
printf("'\n` - it's \\n\x12\"\\\"")
```
looked like:
```
~"'\r\n` - it's \n"\""
```

This patch fixes it by using CMIUtilString::Escape method and now it looks like:
```
~"'\r\n` - it's \\n\x12\"\\\""
```

Reviewers: abidh, emaste, clayborg

Reviewed By: clayborg

Subscribers: zturner, lldb-commits, emaste, clayborg, abidh

Differential Revision: http://reviews.llvm.org/D7858

llvm-svn: 230652

1 files changed, 17 insertions, 0 deletions

diff --git a/lldb/test/tools/lldb-mi/syntax/main.cpp b/lldb/test/tools/lldb-mi/syntax/main.cpp
new file mode 100644
index 00000000000..d2935b08f87
--- /dev/null
+++ b/lldb/test/tools/lldb-mi/syntax/main.cpp
@@ -0,0 +1,17 @@
+//===-- main.cpp ------------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <cstdio>
+
+int
+main(int argc, char const *argv[]) 
+{
+    printf("'\n` - it's \\n\x12\"\\\"");
+    return 0;
+}