X-Git-Url: http://git.xonotic.org/?p=xonotic%2Fdarkplaces.git;a=blobdiff_plain;f=qdefs.h;h=c0e4c14ec5932eba5bdfc234777d44d5958254be;hp=4421ce1d1093447977d8f60e6435ce04d03523c3;hb=a66ee73e39edd25878ca5f5a58f35b125fffca29;hpb=2c78f54e44f84da01d8432db574f1a3e76098b00

diff --git a/qdefs.h b/qdefs.h
index 4421ce1d..c0e4c14e 100644
--- a/qdefs.h
+++ b/qdefs.h
@@ -1,14 +1,30 @@
 #ifndef QDEFS_H
 #define QDEFS_H
 
+#if defined (__GNUC__) || defined (__clang__) || defined (__TINYC__)
+#define DP_GCC_COMPATIBLE
+#endif
+
 #if (__GNUC__ > 2) || defined (__clang__) || (__TINYC__)
 #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
+#define Q_typeof(var) typeof(var)
+#elif defined (MSVC)
+#define Q_typeof(var) decltype(var)
 #endif
 
 #define MAX_NUM_ARGVS	50
@@ -176,6 +192,12 @@
 // This also includes extended characters, and ALL control chars
 #define ISWHITESPACEORCONTROL(ch) ((signed char) (ch) <= (signed char) ' ')
 
+#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 FLOAT_VECTOR_LOSSLESS_FORMAT "%.9g %.9g %.9g"
 #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"
@@ -198,4 +220,22 @@
 #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