From 0cd066933511edb7869c5f6ce462b019a140ce3c Mon Sep 17 00:00:00 2001
From: Evan Martin <martine@danga.com>
Date: Tue, 20 Dec 2011 11:43:57 -0800
Subject: factor out windows perror equivalent

---
 src/subprocess-win32.cc | 16 +---------------
 src/util.cc             | 21 +++++++++++++++++++++
 src/util.h              |  3 +++
 3 files changed, 25 insertions(+), 15 deletions(-)

diff --git a/src/subprocess-win32.cc b/src/subprocess-win32.cc
index 79c4eba..cf61feb 100644
--- a/src/subprocess-win32.cc
+++ b/src/subprocess-win32.cc
@@ -23,21 +23,7 @@
 namespace {
 
 void Win32Fatal(const char* function) {
-  DWORD err = GetLastError();
-
-  char* msg_buf;
-  FormatMessageA(
-        FORMAT_MESSAGE_ALLOCATE_BUFFER |
-        FORMAT_MESSAGE_FROM_SYSTEM |
-        FORMAT_MESSAGE_IGNORE_INSERTS,
-        NULL,
-        err,
-        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
-        (char*)&msg_buf,
-        0,
-        NULL);
-  Fatal("%s: %s", function, msg_buf);
-  LocalFree(msg_buf);
+  Fatal("%s: %s", function, GetLastErrorString().c_str());
 }
 
 }  // anonymous namespace
diff --git a/src/util.cc b/src/util.cc
index e8cd11e..0511806 100644
--- a/src/util.cc
+++ b/src/util.cc
@@ -210,3 +210,24 @@ const char* SpellcheckString(const string& text, ...) {
   va_end(ap);
   return result;
 }
+
+#ifdef WIN32
+string GetLastErrorString() {
+  DWORD err = GetLastError();
+
+  char* msg_buf;
+  FormatMessageA(
+        FORMAT_MESSAGE_ALLOCATE_BUFFER |
+        FORMAT_MESSAGE_FROM_SYSTEM |
+        FORMAT_MESSAGE_IGNORE_INSERTS,
+        NULL,
+        err,
+        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+        (char*)&msg_buf,
+        0,
+        NULL);
+  string msg = msg_buf;
+  LocalFree(msg_buf);
+  return msg;
+}
+#endif
diff --git a/src/util.h b/src/util.h
index d36e2e1..f6601d3 100644
--- a/src/util.h
+++ b/src/util.h
@@ -57,6 +57,9 @@ const char* SpellcheckString(const string& text, ...);
 
 #ifdef _WIN32
 #define snprintf _snprintf
+
+/// Convert the value returned by GetLastError() into a string.
+string GetLastErrorString();
 #endif
 
 #endif  // NINJA_UTIL_H_
-- 
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