2 files changed, 32 insertions, 0 deletions
diff --git a/src/util/Error.cxx b/src/util/Error.cxx
index ef8282329..92b2cc5d0 100644
--- a/src/util/Error.cxx
+++ b/src/util/Error.cxx
@@ -145,4 +145,30 @@ Error::SetLastError(const char *prefix)
 	SetLastError(GetLastError(), prefix);
 }
 
+void
+Error::FormatLastError(DWORD _code, const char *fmt, ...)
+{
+	char buffer[1024];
+	va_list ap;
+	va_start(ap, fmt);
+	vsnprintf(buffer, sizeof(buffer), fmt, ap);
+	va_end(ap);
+
+	SetLastError(_code, buffer);
+}
+
+void
+Error::FormatLastError(const char *fmt, ...)
+{
+	DWORD _code = GetLastError();
+
+	char buffer[1024];
+	va_list ap;
+	va_start(ap, fmt);
+	vsnprintf(buffer, sizeof(buffer), fmt, ap);
+	va_end(ap);
+
+	SetLastError(_code, buffer);
+}
+
 #endif
diff --git a/src/util/Error.hxx b/src/util/Error.hxx
index 82f01105f..ab66ae5cb 100644
--- a/src/util/Error.hxx
+++ b/src/util/Error.hxx
@@ -168,6 +168,12 @@ public:
 #ifdef WIN32
 	void SetLastError(DWORD _code, const char *prefix);
 	void SetLastError(const char *prefix);
+
+	gcc_printf(3,4)
+	void FormatLastError(DWORD code, const char *fmt, ...);
+
+	gcc_printf(2,3)
+	void FormatLastError(const char *fmt, ...);
 #endif
 };