From 10a049e6cf50eb9a1dddae49dc21513cfeddcb47 Mon Sep 17 00:00:00 2001
From: Daniel Dunbar <daniel@zuster.org>
Date: Sat, 27 Nov 2010 07:59:50 +0000
Subject: [PATCH] raw_ostream::write_escaped: Add a UseHexEscapes argument.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120200 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Support/raw_ostream.h |  2 +-
 lib/Support/raw_ostream.cpp        | 21 +++++++++++++++------
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/include/llvm/Support/raw_ostream.h b/include/llvm/Support/raw_ostream.h
index d55feb7b0f3..ae21d2a0402 100644
--- a/include/llvm/Support/raw_ostream.h
+++ b/include/llvm/Support/raw_ostream.h
@@ -196,7 +196,7 @@ public:
 
   /// write_escaped - Output \arg Str, turning '\\', '\t', '\n', '"', and
   /// anything that doesn't satisfy std::isprint into an escape sequence.
-  raw_ostream &write_escaped(StringRef Str);
+  raw_ostream &write_escaped(StringRef Str, bool UseHexEscapes = false);
 
   raw_ostream &write(unsigned char C);
   raw_ostream &write(const char *Ptr, size_t Size);
diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp
index dceccad161d..d3d653983b0 100644
--- a/lib/Support/raw_ostream.cpp
+++ b/lib/Support/raw_ostream.cpp
@@ -15,6 +15,7 @@
 #include "llvm/Support/Format.h"
 #include "llvm/System/Program.h"
 #include "llvm/System/Process.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Config/config.h"
 #include "llvm/Support/Compiler.h"
@@ -167,7 +168,8 @@ raw_ostream &raw_ostream::write_hex(unsigned long long N) {
   return write(CurPtr, EndPtr-CurPtr);
 }
 
-raw_ostream &raw_ostream::write_escaped(StringRef Str) {
+raw_ostream &raw_ostream::write_escaped(StringRef Str,
+                                        bool UseHexEscapes) {
   for (unsigned i = 0, e = Str.size(); i != e; ++i) {
     unsigned char c = Str[i];
 
@@ -190,11 +192,18 @@ raw_ostream &raw_ostream::write_escaped(StringRef Str) {
         break;
       }
 
-      // Always expand to a 3-character octal escape.
-      *this << '\\';
-      *this << char('0' + ((c >> 6) & 7));
-      *this << char('0' + ((c >> 3) & 7));
-      *this << char('0' + ((c >> 0) & 7));
+      // Write out the escaped representation.
+      if (UseHexEscapes) {
+        *this << '\\' << 'x';
+        *this << hexdigit((c >> 4 & 0xF));
+        *this << hexdigit((c >> 0) & 0xF);
+      } else {
+        // Always use a full 3-character octal escape.
+        *this << '\\';
+        *this << char('0' + ((c >> 6) & 7));
+        *this << char('0' + ((c >> 3) & 7));
+        *this << char('0' + ((c >> 0) & 7));
+      }
     }
   }