From fe60c52c70705b721bee7fbd6e3aae076a3b99c9 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Fri, 18 Dec 2015 01:06:12 +0100
Subject: system/Error: add MakeErrno(), MakeLastError()

---
 src/system/Error.hxx | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

(limited to 'src/system/Error.hxx')

diff --git a/src/system/Error.hxx b/src/system/Error.hxx
index 948bb47e5..5a10b6844 100644
--- a/src/system/Error.hxx
+++ b/src/system/Error.hxx
@@ -49,6 +49,19 @@ FormatSystemError(std::error_code code, const char *fmt, Args&&... args)
 
 #include <windows.h>
 
+static inline std::system_error
+MakeLastError(DWORD code, const char *msg)
+{
+	return std::system_error(std::error_code(code, std::system_category()),
+				 msg);
+}
+
+static inline std::system_error
+MakeLastError(const char *msg)
+{
+	return MakeLastError(GetLastError(), msg);
+}
+
 template<typename... Args>
 static inline std::system_error
 FormatLastError(DWORD code, const char *fmt, Args&&... args)
@@ -64,8 +77,7 @@ FormatLastError(DWORD code, const char *fmt, Args&&... args)
 	FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM |
 		       FORMAT_MESSAGE_IGNORE_INSERTS,
 		       nullptr, code, 0, p, end - p, nullptr);
-	return std::system_error(std::error_code(code, std::system_category()),
-				 buffer);
+	return MakeLastError(code, buffer);
 }
 
 template<typename... Args>
@@ -81,6 +93,19 @@ FormatLastError(const char *fmt, Args&&... args)
 #include <errno.h>
 #include <string.h>
 
+static inline std::system_error
+MakeErrno(int code, const char *msg)
+{
+	return std::system_error(std::error_code(code, std::system_category()),
+				 msg);
+}
+
+static inline std::system_error
+MakeErrno(const char *msg)
+{
+	return MakeErrno(errno, msg);
+}
+
 template<typename... Args>
 static inline std::system_error
 FormatErrno(int code, const char *fmt, Args&&... args)
@@ -94,8 +119,7 @@ FormatErrno(int code, const char *fmt, Args&&... args)
 	*p++ = ' ';
 
 	CopyString(p, strerror(code), end - p);
-	return std::system_error(std::error_code(code, std::system_category()),
-				 buffer);
+	return MakeErrno(code, buffer);
 }
 
 template<typename... Args>
-- 
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