integer overflow/underflow stuff

all.h

@@ -185,6 +185,13 @@
 
 #define stmnt(S) do{ S }while(0)
 
+#ifndef STATIC_ASSERT
+	#define STATIC_ASSERT3(cond, msg) typedef char static_assertion_##msg[(!!(cond))*2-1]
+	#define STATIC_ASSERT2(cond, line) STATIC_ASSERT3(cond, static_assertion_at_line_##line)
+	#define STATIC_ASSERT1(cond, line) STATIC_ASSERT2(cond, line)
+	#define STATIC_ASSERT(cond)        STATIC_ASSERT1(cond, __LINE__)
+#endif
+
 #if !defined(assertBreak)
 # define assertBreak() (*(volatile int*)0 = 0)
 #endif
@@ -260,6 +267,17 @@ typedef const char*           str;
 typedef float                 f32;
 typedef double                f64;
 
+STATIC_ASSERT(sizeof(u8) == 1);
+STATIC_ASSERT(sizeof(i8) == 1);
+STATIC_ASSERT(sizeof(u16) == 2);
+STATIC_ASSERT(sizeof(i16) == 2);
+STATIC_ASSERT(sizeof(u32) == 4);
+STATIC_ASSERT(sizeof(i32) == 4);
+STATIC_ASSERT(sizeof(u64) == 8);
+STATIC_ASSERT(sizeof(i64) == 8);
+STATIC_ASSERT(sizeof(f32) == 4);
+STATIC_ASSERT(sizeof(f64) == 8);
+
 //typedef long double f80; only returning 8 bytes on my mac for some reason
 /*
   printf("u8 %d\n", (int)sizeof(u8) * 8);
@@ -625,6 +643,9 @@ fn void u32ReverseArray(u32 arr[], u32 size);
 fn Vec2f32 vec2Add(Vec2 a, Vec2 b);
 fn Vec2f32 vec2Subtract(Vec2 a, Vec2 b);
 fn Vec2f32 vec2FromHexCube(Vec2 map_center, XYZ cube, f32 size, f32 border_thickness);
+fn i32 i32Middle(i32 x, i32 y);
+fn u32 u32Middle(u32 x, u32 y);
+fn u64 u64SafeMul(u64 x, u64 y);
 
 ///// MEMORY (Arenas)
 #define ARENA_MAX GB(1)