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+/** @file
+    @brief Header containing macros for source-level annotation.
+
+    In theory, supporting MSVC SAL, as well as compatible GCC and
+    Clang attributes. In practice, expanded as time allows and requires.
+
+    Must be c-safe!
+
+    @date 2014
+
+    @author
+    Sensics, Inc.
+    <http://sensics.com/osvr>
+*/
+
+/*
+// Copyright 2014 Sensics, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+*/
+
+#ifndef INCLUDED_AnnotationMacrosC_h_GUID_48538D9B_35E3_4E9A_D2B0_D83D51DD5900
+#define INCLUDED_AnnotationMacrosC_h_GUID_48538D9B_35E3_4E9A_D2B0_D83D51DD5900
+
+#ifndef OSVR_DISABLE_ANALYSIS
+
+#  if defined(_MSC_VER) && (_MSC_VER >= 1700)
+/* Visual C++ (2012 and newer) */
+/* Using SAL attribute format:
+ * http://msdn.microsoft.com/en-us/library/ms182032(v=vs.120).aspx */
+
+#    include <sal.h>
+
+#    define OSVR_IN _In_
+#    define OSVR_IN_PTR _In_
+#    define OSVR_IN_OPT _In_opt_
+#    define OSVR_IN_STRZ _In_z_
+#    define OSVR_IN_READS(NUM_ELEMENTS) _In_reads_(NUM_ELEMENTS)
+
+#    define OSVR_OUT _Out_
+#    define OSVR_OUT_PTR _Outptr_
+#    define OSVR_OUT_OPT _Out_opt_
+
+#    define OSVR_INOUT _Inout_
+#    define OSVR_INOUT_PTR _Inout_
+
+#    define OSVR_RETURN_WARN_UNUSED _Must_inspect_result_
+#    define OSVR_RETURN_SUCCESS_CONDITION(X) _Return_type_success_(X)
+
+/* end of msvc section */
+#  elif defined(__GNUC__) && (__GNUC__ >= 4)
+/* section for GCC and GCC-alikes */
+
+#    if defined(__clang__)
+/* clang-specific section */
+#    endif
+
+#    define OSVR_FUNC_NONNULL(X) __attribute__((__nonnull__ X))
+#    define OSVR_RETURN_WARN_UNUSED __attribute__((warn_unused_result))
+
+/* end of gcc section and compiler detection */
+#  endif
+
+/* end of ndef disable analysis */
+#endif
+
+/* Fallback declarations */
+/**
+@defgroup annotation_macros Static analysis annotation macros
+@brief Wrappers for Microsoft's SAL annotations and others
+@ingroup Util
+
+Use of these is optional, but recommended particularly for C APIs,
+as well as any methods handling a buffer with a length.
+@{
+*/
+/** @name Parameter annotations
+
+    These indicate the role and valid values for parameters to functions.
+
+    At most one of these should be placed before a parameter's type name in the
+   function parameter list, in both the declaration and definition. (They must
+   match!)
+   @{
+*/
+/** @def OSVR_IN
+    @brief Indicates a required function parameter that serves only as input.
+*/
+#ifndef OSVR_IN
+#  define OSVR_IN
+#endif
+
+/** @def OSVR_IN_PTR
+    @brief Indicates a required pointer (non-null) function parameter that
+    serves only as input.
+*/
+#ifndef OSVR_IN_PTR
+#  define OSVR_IN_PTR
+#endif
+
+/** @def OSVR_IN_OPT
+    @brief Indicates a function parameter (pointer) that serves only as input,
+   but is optional and might be NULL.
+*/
+#ifndef OSVR_IN_OPT
+#  define OSVR_IN_OPT
+#endif
+
+/** @def OSVR_IN_STRZ
+    @brief Indicates a null-terminated string function parameter that serves
+   only as input.
+*/
+#ifndef OSVR_IN_STRZ
+#  define OSVR_IN_STRZ
+#endif
+
+/** @def OSVR_IN_READS(NUM_ELEMENTS)
+    @brief Indicates a buffer containing input with the specified number of
+   elements.
+
+    The specified number of elements is typically the name of another parameter.
+*/
+#ifndef OSVR_IN_READS
+#  define OSVR_IN_READS(NUM_ELEMENTS)
+#endif
+
+/** @def OSVR_OUT
+    @brief Indicates a required function parameter that serves only as output.
+    In C code, since this usually means "pointer", you probably want
+   OSVR_OUT_PTR instead.
+*/
+#ifndef OSVR_OUT
+#  define OSVR_OUT
+#endif
+
+/** @def OSVR_OUT_PTR
+    @brief Indicates a required pointer (non-null) function parameter that
+    serves only as output.
+*/
+#ifndef OSVR_OUT_PTR
+#  define OSVR_OUT_PTR
+#endif
+
+/** @def OSVR_OUT_OPT
+    @brief Indicates a function parameter (pointer) that serves only as output,
+   but is optional and might be NULL
+*/
+#ifndef OSVR_OUT_OPT
+#  define OSVR_OUT_OPT
+#endif
+
+/** @def OSVR_INOUT
+    @brief Indicates a required function parameter that is both read and written
+   to.
+
+    In C code, since this usually means "pointer", you probably want
+   OSVR_INOUT_PTR instead.
+*/
+#ifndef OSVR_INOUT
+#  define OSVR_INOUT
+#endif
+
+/** @def OSVR_INOUT_PTR
+    @brief Indicates a required pointer (non-null) function parameter that is
+    both read and written to.
+*/
+#ifndef OSVR_INOUT_PTR
+#  define OSVR_INOUT_PTR
+#endif
+
+/* End of parameter annotations. */
+/** @} */
+
+/** @name Function annotations
+
+    These indicate particular relevant aspects about a function. Some
+    duplicate the effective meaning of parameter annotations: applying both
+    allows the fullest extent of static analysis tools to analyze the code,
+    and in some compilers, generate warnings.
+
+   @{
+*/
+/** @def OSVR_FUNC_NONNULL(X)
+    @brief Indicates the parameter(s) that must be non-null.
+
+    @param X A parenthesized list of parameters by number (1-based index)
+
+    Should be placed after a function declaration (but before the
+   semicolon). Repeating in the definition is not needed.
+*/
+#ifndef OSVR_FUNC_NONNULL
+#  define OSVR_FUNC_NONNULL(X)
+#endif
+
+/** @def OSVR_RETURN_WARN_UNUSED
+    @brief Indicates the function has a return value that must be used (either a
+   security problem or an obvious bug if not).
+
+    Should be placed before the return value (and virtual keyword, if
+   applicable) in both declaration and definition.
+*/
+#ifndef OSVR_RETURN_WARN_UNUSED
+#  define OSVR_RETURN_WARN_UNUSED
+#endif
+/* End of function annotations. */
+/** @} */
+
+/** @def OSVR_RETURN_SUCCESS_CONDITION
+    @brief Applied to a typedef, indicates the condition for `return` under
+   which a function returning it should be considered to have succeeded (thus
+   holding certain specifications).
+
+    Should be placed before the typename in a typedef, with the parameter
+   including the keyword `return` to substitute for the return value.
+*/
+#ifndef OSVR_RETURN_SUCCESS_CONDITION
+#  define OSVR_RETURN_SUCCESS_CONDITION(X)
+#endif
+
+/* End of annotation group. */
+/** @} */
+#endif