[PATCH] D18783: [clang-tidy] add new checker for string literal with NUL character.

[Etienne Bergeron via cfe-commits]

etienneb created this revision.
etienneb added a reviewer: alexfh.
etienneb added a subscriber: cfe-commits.

This patch add the support for detecting suspicious string
literals and their usage.

The following example shows a incorrect character escaping leading 
to an embedded NUL character. 
```
  std::string str = "\0x42";   // Should be "\x42".
```

The patch also add detection of truncated literal when a literal
is passed to a string constuctor.

http://reviews.llvm.org/D18783

Files:
  clang-tidy/misc/CMakeLists.txt
  clang-tidy/misc/MiscTidyModule.cpp
  clang-tidy/misc/StringLiteralWithEmbeddedNulCheck.cpp
  clang-tidy/misc/StringLiteralWithEmbeddedNulCheck.h
  docs/clang-tidy/checks/list.rst
  docs/clang-tidy/checks/misc-string-literal-with-embedded-nul.rst
  test/clang-tidy/misc-string-literal-with-embedded-nul.cpp

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