From c67055bad3cdfc93e2ac57d87f36c6e0993af690 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Wed, 17 May 2017 06:00:20 +0300
Subject: initial commit

---
 src/error.cpp | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 src/error.cpp

(limited to 'src/error.cpp')

diff --git a/src/error.cpp b/src/error.cpp
new file mode 100644
index 0000000..10b668b
--- /dev/null
+++ b/src/error.cpp
@@ -0,0 +1,53 @@
+// Copyright (c) 2017 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "PDB repository" project.
+// For details, see https://github.com/egor-tensin/pdb-repo.
+// Distributed under the MIT License.
+
+#include "pdb/all.hpp"
+
+#include <Windows.h>
+
+#include <string>
+
+namespace pdb
+{
+    namespace error
+    {
+        namespace
+        {
+            std::string trim_trailing_newline(const std::string& s)
+            {
+                const auto last_pos = s.find_last_not_of("\r\n");
+                if (std::string::npos == last_pos)
+                    return {};
+                return s.substr(0, last_pos + 1);
+            }
+        }
+
+        std::string CategoryWindows::message(int code) const
+        {
+            char* buf;
+
+            const auto nbwritten = FormatMessageA(
+                FORMAT_MESSAGE_ALLOCATE_BUFFER
+                    | FORMAT_MESSAGE_FROM_SYSTEM
+                    | FORMAT_MESSAGE_IGNORE_INSERTS,
+                NULL,
+                code,
+                MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+                reinterpret_cast<char*>(&buf),
+                0,
+                NULL);
+
+            if (0 == nbwritten)
+            {
+                LocalFree(buf);
+                return "Couldn't format the error message";
+            }
+
+            std::string msg{buf, nbwritten};
+            LocalFree(buf);
+            return trim_trailing_newline(msg);
+        }
+    }
+}
-- 
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