1 files changed, 106 insertions, 0 deletions
diff --git a/include/sal/detail/log.h b/include/sal/detail/log.h
new file mode 100644
index 000000000000..5cfc5e5fc0cc
--- /dev/null
+++ b/include/sal/detail/log.h
@@ -0,0 +1,106 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_SAL_DETAIL_LOG_H
+#define INCLUDED_SAL_DETAIL_LOG_H
+
+#include "sal/config.h"
+
+#include "sal/saldllapi.h"
+#include "sal/types.h"
+
+/** @cond INTERNAL */
+
+/* This header makes available replacements working in both C and C++ for the
+   obsolete osl/diagnose.h functionality that in turn is used from both C and
+   C++ code and the obsolete tools/debug.hxx and
+   canvas/inc/canvas/verbosetrace.hxx functionality that uses printf-style
+   formatting.  Once that obsolete functionality is removed, this header can be
+   removed, too.
+
+   This header uses variadic macros in both C (where they are officially only
+   supported since C99) and C++ (where they are officially only supported since
+   C++11).  It appears that all relevant compilers (esp. GCC 4.0 and MS VS 2008
+   Express) already support them in their C and C++ dialects.  See also
+   <http://wiki.apache.org/stdcxx/C++0xCompilerSupport>.
+
+   Avoid the use of other sal code in this header as much as possible, so that
+   this code can be called from other sal code without causing endless
+   recursion.
+*/
+
+#if defined __cplusplus
+extern "C" {
+#endif
+
+/*
+ Clang warns about 'sal_True && sal_True' (those being integers and not booleans)
+ when it sees preprocessed source (-save-temps or using icecream)
+*/
+#if defined __cplusplus
+#define SAL_LOG_TRUE true
+#define SAL_LOG_FALSE false
+#else
+#define SAL_LOG_TRUE sal_True
+#define SAL_LOG_FALSE sal_False
+#endif
+
+enum sal_detail_LogLevel {
+    SAL_DETAIL_LOG_LEVEL_INFO, SAL_DETAIL_LOG_LEVEL_WARN,
+    SAL_DETAIL_LOG_LEVEL_DEBUG = SAL_MAX_ENUM
+};
+
+SAL_DLLPUBLIC void SAL_CALL sal_detail_logFormat(
+    enum sal_detail_LogLevel level, char const * area, char const * where,
+    char const * format, ...)
+/* TODO: enabling this will produce a huge amount of -Werror=format errors: */
+#if defined __GNUC__ && 0
+    __attribute__((format(printf, 4, 5)))
+#endif
+    ;
+
+#if defined __cplusplus
+}
+#endif
+
+#define SAL_DETAIL_LOG_FORMAT(condition, level, area, where, ...) \
+    do { \
+        if (condition) { \
+            sal_detail_logFormat((level), (area), (where), __VA_ARGS__); \
+        } \
+    } while (SAL_LOG_FALSE)
+
+#if defined SAL_LOG_INFO
+#define SAL_DETAIL_ENABLE_LOG_INFO SAL_LOG_TRUE
+#else
+#define SAL_DETAIL_ENABLE_LOG_INFO SAL_LOG_FALSE
+#endif
+#if defined SAL_LOG_WARN
+#define SAL_DETAIL_ENABLE_LOG_WARN SAL_LOG_TRUE
+#else
+#define SAL_DETAIL_ENABLE_LOG_WARN SAL_LOG_FALSE
+#endif
+
+#define SAL_DETAIL_WHERE __FILE__ ":" SAL_STRINGIFY(__LINE__) ": "
+
+#define SAL_DETAIL_INFO_IF_FORMAT(condition, area, ...) \
+    SAL_DETAIL_LOG_FORMAT( \
+        SAL_DETAIL_ENABLE_LOG_INFO && (condition), SAL_DETAIL_LOG_LEVEL_INFO, \
+        area, SAL_DETAIL_WHERE, __VA_ARGS__)
+
+#define SAL_DETAIL_WARN_IF_FORMAT(condition, area, ...) \
+    SAL_DETAIL_LOG_FORMAT( \
+        SAL_DETAIL_ENABLE_LOG_WARN && (condition), SAL_DETAIL_LOG_LEVEL_WARN, \
+        area, SAL_DETAIL_WHERE, __VA_ARGS__)
+
+/** @endcond */
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */