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, 1 insertions, 0 deletions

diff --git a/lldb/tools/lldb-mi/MIUtilString.h b/lldb/tools/lldb-mi/MIUtilString.h
index 37f3092441b..54a0f7704c0 100644
--- a/lldb/tools/lldb-mi/MIUtilString.h
+++ b/lldb/tools/lldb-mi/MIUtilString.h
@@ -72,6 +72,7 @@ class CMIUtilString : public std::string
     MIuint FindFirst(const CMIUtilString &vrPattern, const bool vbSkipQuotedText, bool &vrwbNotFoundClosedQuote,
                      const MIuint vnPos = 0) const;
     MIuint FindFirstNot(const CMIUtilString &vrPattern, const MIuint vnPos = 0) const;
+    CMIUtilString Escape(const bool vbEscapeQuotes = false) const;
     //
     CMIUtilString &operator=(const MIchar *vpRhs);
     CMIUtilString &operator=(const std::string &vrRhs);