1 files changed, 119 insertions, 0 deletions
diff --git a/source/chad.h b/source/chad.h
new file mode 100644
index 0000000..ceaec36
--- /dev/null
+++ b/source/chad.h
@@ -0,0 +1,119 @@
+/* util.h & time.h */
+
+#ifndef UTIL_H_
+#define UTIL_H_
+
+/* these things that are highly portable among programs and thus written in a modular style */
+
+#include <math.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <stdint.h>
+
+#define always_inline static inline __attribute__((always_inline))
+
+#define MIN(a,b) ((a)<(b)?(a):(b))
+#define MAX(a,b) ((a)>(b)?(a):(b))
+#define CLAMP(a,b,c) (a)<(b)?(b):(a)>(c)?(c):(a)
+
+always_inline void Root(char * filename) {
+  char path[PATH_MAX], * terminator;
+  if (!realpath(filename, path)) { return; }
+  if ((terminator = strrchr(path, '/'))) {
+    *terminator = '\0';
+    if(chdir(path)) { abort(); }
+  }
+}
+
+always_inline float Angle(float a_x, float a_y, float b_x, float b_y) {
+  return atan2f(b_y - a_y, b_x - a_x);
+}
+
+always_inline float Distance(float a_x, float a_y, float b_x, float b_y) {
+  return sqrtf(powf(b_x - a_x, 2) + powf(b_y - a_y, 2));
+}
+
+typedef int8_t i8;
+typedef int16_t i16;
+typedef int32_t i32;
+typedef int64_t i64;
+
+typedef uint8_t u8;
+typedef uint16_t u16;
+typedef uint32_t u32;
+typedef uint64_t u64;
+
+typedef float f32;
+typedef double f64;
+
+#endif
+
+/* time.h */
+#ifndef TIME_H_
+#define TIME_H_
+#include <time.h>
+
+#define TIMESPEC_TO_F64(ts) ((double)(ts).tv_sec + ((double)(ts).tv_nsec / TIMESPEC_HZ))
+enum { TIMESPEC_HZ = 1000000000 };
+
+typedef struct timespec timespec_t;
+
+static const timespec_t one_second = {1, 0}, zero_seconds = {0, 0};
+
+always_inline timespec_t timespec_add(timespec_t a, timespec_t b) {
+    a.tv_sec += b.tv_sec;
+    a.tv_nsec += b.tv_nsec;
+    if (a.tv_nsec >= 1000000000) {
+        a.tv_sec++;
+        a.tv_nsec -= 1000000000;
+    }
+    return a;
+}
+
+always_inline timespec_t timespec_sub(timespec_t a, timespec_t b) {
+    a.tv_sec -= b.tv_sec;
+    a.tv_nsec -= b.tv_nsec;
+    if (a.tv_nsec < 0) {
+        a.tv_sec--;
+        a.tv_nsec += 1000000000;
+    }
+    return a;
+}
+
+always_inline int timespec_cmp(timespec_t a, timespec_t b) {
+  return a.tv_sec > b.tv_sec ?
+    (1) :
+    a.tv_sec < b.tv_sec ?
+    (-1) :
+    (
+      a.tv_nsec > b.tv_nsec ?
+      (1) :
+      a.tv_nsec < b.tv_nsec ?
+      (-1) : 0
+    );
+}
+
+always_inline timespec_t timespec_max(timespec_t a, timespec_t b) {
+  return a.tv_sec > b.tv_sec ?
+    a :
+    a.tv_sec < b.tv_sec ?
+    b :
+    (
+      a.tv_nsec > b.tv_nsec ?
+      a : b
+    );
+}
+
+always_inline timespec_t timespec_min(timespec_t a, timespec_t b) {
+  return a.tv_sec < b.tv_sec ?
+    a :
+    a.tv_sec > b.tv_sec ?
+    b :
+    (
+      a.tv_nsec < b.tv_nsec ?
+      a : b
+    );
+}
+#endif /* TIME_H_ */