qdefs: Define separate FLOAT_ and DOUBLE_ versions of lossless format and true for...

[xonotic/darkplaces.git] / qdefs.h

diff --git a/qdefs.h b/qdefs.h
index 463761e9b43a311993b6b182edf5f657c07b9a72..fb942a4543126e6a99c0986e49946967d329d0f5 100644 (file)
--- a/qdefs.h
+++ b/qdefs.h
@@ -9,10 +9,16 @@
 #define DP_FUNC_PRINTF(n) __attribute__ ((format (printf, n, n+1)))
 #define DP_FUNC_PURE      __attribute__ ((pure))
 #define DP_FUNC_NORETURN  __attribute__ ((noreturn))
+#define DP_FUNC_ALWAYSINLINE inline __attribute__((always_inline))
 #else
 #define DP_FUNC_PRINTF(n)
 #define DP_FUNC_PURE
 #define DP_FUNC_NORETURN
+# if defined (MSVC)
+# define DP_FUNC_ALWAYSINLINE __forceinline
+# else
+# define DP_FUNC_ALWAYS_INLINE inline
+# endif
 #endif
 
 #ifdef DP_GCC_COMPATIBLE
@@ -186,15 +192,13 @@
 // This also includes extended characters, and ALL control chars
 #define ISWHITESPACEORCONTROL(ch) ((signed char) (ch) <= (signed char) ' ')
 
-#ifdef PRVM_64
-#define FLOAT_IS_TRUE_FOR_INT(x) ((x) & 0x7FFFFFFFFFFFFFFF) // also match "negative zero" doubles of value 0x8000000000000000
-#define FLOAT_LOSSLESS_FORMAT "%.17g"
-#define VECTOR_LOSSLESS_FORMAT "%.17g %.17g %.17g"
-#else
+#define DOUBLE_IS_TRUE_FOR_INT(x) ((x) & 0x7FFFFFFFFFFFFFFF) // also match "negative zero" doubles of value 0x8000000000000000
+#define DOUBLE_LOSSLESS_FORMAT "%.17g"
+#define DOUBLE_VECTOR_LOSSLESS_FORMAT "%.17g %.17g %.17g"
+
 #define FLOAT_IS_TRUE_FOR_INT(x) ((x) & 0x7FFFFFFF) // also match "negative zero" floats of value 0x80000000
 #define FLOAT_LOSSLESS_FORMAT "%.9g"
-#define VECTOR_LOSSLESS_FORMAT "%.9g %.9g %.9g"
-#endif
+#define FLOAT_VECTOR_LOSSLESS_FORMAT "%.9g %.9g %.9g"
 
 // originally this was _MSC_VER
 // but here we want to test the system libc, which on win32 is borked, and NOT the compiler
@@ -208,4 +212,22 @@
 #define INT_LOSSLESS_FORMAT_CONVERT_U(x) ((uintmax_t)(x))
 #endif
 
+// simple safe library to handle integer overflows when doing buffer size calculations
+// Usage:
+//   - calculate data size using INTOVERFLOW_??? macros
+//   - compare: calculated-size <= INTOVERFLOW_NORMALIZE(buffersize)
+// Functionality:
+//   - all overflows (values > INTOVERFLOW_MAX) and errors are mapped to INTOVERFLOW_MAX
+//   - if any input of an operation is INTOVERFLOW_MAX, INTOVERFLOW_MAX will be returned
+//   - otherwise, regular arithmetics apply
+
+#define INTOVERFLOW_MAX 2147483647
+
+#define INTOVERFLOW_ADD(a,b) (((a) < INTOVERFLOW_MAX && (b) < INTOVERFLOW_MAX && (a) < INTOVERFLOW_MAX - (b)) ? ((a) + (b)) : INTOVERFLOW_MAX)
+#define INTOVERFLOW_SUB(a,b) (((a) < INTOVERFLOW_MAX && (b) < INTOVERFLOW_MAX && (b) <= (a))                  ? ((a) - (b)) : INTOVERFLOW_MAX)
+#define INTOVERFLOW_MUL(a,b) (((a) < INTOVERFLOW_MAX && (b) < INTOVERFLOW_MAX && (a) < INTOVERFLOW_MAX / (b)) ? ((a) * (b)) : INTOVERFLOW_MAX)
+#define INTOVERFLOW_DIV(a,b) (((a) < INTOVERFLOW_MAX && (b) < INTOVERFLOW_MAX && (b) > 0)                     ? ((a) / (b)) : INTOVERFLOW_MAX)
+
+#define INTOVERFLOW_NORMALIZE(a) (((a) < INTOVERFLOW_MAX) ? (a) : (INTOVERFLOW_MAX - 1))
+
 #endif