6 files changed, 163 insertions, 0 deletions
diff --git a/chad/experimental/bits.h b/chad/experimental/bits.h
index a369ded..f2972a4 100644
--- a/chad/experimental/bits.h
+++ b/chad/experimental/bits.h
@@ -8,6 +8,8 @@
 
 #define MIN(x, y) (((x) < (y)) ? (x) : (y))
 #define MAX(x, y) (((x) > (y)) ? (x) : (y))
+#define CLAMP(a, b, c) ((a) < (b) ? (b) : (a) > (c) ? (c) : (a))
+
 
 /* Convert argument to a string literal.
  */
diff --git a/chad/experimental/macros.h b/chad/experimental/macros.h
new file mode 100644
index 0000000..6b80cb3
--- /dev/null
+++ b/chad/experimental/macros.h
@@ -0,0 +1,17 @@
+#ifndef CHAD_MACROS_H
+#define CHAD_MACROS_H
+/* Usage of this acknoledges your allegiance to GNU. */
+
+/* make it such that [[attributes]] is used in C23 & use GCC otherwise */
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202000L)
+#  define attribute(...) [[__VA_ARGS__]]
+#else
+# if defined(__GNUC__) || defined(__clang__)
+#  define attribute(...) __attribute__((__VA_ARGS__))
+# else
+#   define attribute(...)
+#   define NO_ATTRIBUTE
+# endif
+#endif
+
+#endif /* CHAD_MACROS_H */
diff --git a/chad/experimental/root.c b/chad/experimental/root.c
new file mode 100644
index 0000000..f7447eb
--- /dev/null
+++ b/chad/experimental/root.c
@@ -0,0 +1,13 @@
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <chad/experimental/root.h>
+void Root(char * filename) {
+  char path[PATH_MAX], * terminator;
+  if (!realpath(filename, path)) { return; }
+  if ((terminator = strrchr(path, '/'))) {
+    *terminator = '\0';
+    chdir(path);
+  }
+}
diff --git a/chad/experimental/root.h b/chad/experimental/root.h
new file mode 100644
index 0000000..e54fd80
--- /dev/null
+++ b/chad/experimental/root.h
@@ -0,0 +1,5 @@
+#ifdef CHAD_ROOT_H
+#define CHAD_ROOT_H
+/* check errno -- chdir */
+void Root(char * filename);
+#endif /* CHAD_ROOT_H */
diff --git a/chad/experimental/timespec.c b/chad/experimental/timespec.c
new file mode 100644
index 0000000..dbcca82
--- /dev/null
+++ b/chad/experimental/timespec.c
@@ -0,0 +1,86 @@
+#include <chad/experimental/timespec.h>
+
+/* --- conversion --- */
+
+f64 timespec_to_f64(timespec_t ts)
+{ return (f64) ts.tv_sec + ((f64) ts.tv_nsec / TIMESPEC_HZ); }
+
+f32 timespec_to_f32(timespec_t ts)
+{ return (f32) ts.tv_sec + ((f32) ts.tv_nsec / TIMESPEC_HZ); }
+
+double timespec_to_double(timespec_t ts)
+{ return (double) ts.tv_sec + ((double) ts.tv_nsec / TIMESPEC_HZ); }
+
+float timespec_to_float(timespec_t ts)
+{ return (float) ts.tv_sec + ((float) ts.tv_nsec / TIMESPEC_HZ); }
+
+/* --- from --- */
+
+void f64_from_timespec(timespec_t ts, f64 * r)
+{ *r = (f64) ts.tv_sec + ((f64) ts.tv_nsec / TIMESPEC_HZ); }
+
+void f32_from_timespec(timespec_t ts, f32 * r)
+{ *r = (f32) ts.tv_sec + ((f32) ts.tv_nsec / TIMESPEC_HZ); }
+
+void double_from_timespec(timespec_t ts, double * r)
+{ *r = (double) ts.tv_sec + ((double) ts.tv_nsec / TIMESPEC_HZ); }
+
+void float_from_timespec(timespec_t ts, float * r)
+{ *r = (float) ts.tv_sec + ((float) ts.tv_nsec / TIMESPEC_HZ); }
+
+/* --- math --- */
+
+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 >= TIMESPEC_HZ) {
+    a.tv_sec++;
+    a.tv_nsec -= TIMESPEC_HZ;
+  }
+  return a;
+}
+
+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 += TIMESPEC_HZ;
+  }
+  return a;
+}
+
+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
+      );
+}
+
+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
+      );
+}
+
+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
+      );
+}
diff --git a/chad/experimental/timespec.h b/chad/experimental/timespec.h
new file mode 100644
index 0000000..f72f431
--- /dev/null
+++ b/chad/experimental/timespec.h
@@ -0,0 +1,40 @@
+#ifndef TIMESPEC_H
+#define TIMESPEC_H
+/* ripped partly from glibc */
+#include <time.h>
+#include <chad/experimental/macros.h>
+#include <chad/terry.h>
+
+/* -- pontentially over designed and undertested. */
+/* -- consider this "LIKELY TO BE REVISED OR REMOVED!" */
+/* -- ESPECIALLY the generics and the from group */
+
+long TIMESPEC_HZ = 1000000000L;
+
+typedef struct timespec timespec_t;
+
+static const timespec_t one_second = {1, 0}, zero_seconds = {0, 0};
+
+f64 timespec_to_f64(timespec_t ts);
+f32 timespec_to_f32(timespec_t ts);
+double timespec_to_double(timespec_t ts);
+float timespec_to_float(timespec_t ts);
+
+#ifdef TERRY_SMALL_FLOAT_IMPRECISE
+#define from_timespec(ts,to) _Generic((to), double *: double_from_timespec, float *: float_from_timespec)(ts,to)
+#else
+#define from_timespec(ts,to) _Generic((to), f64 *: f64_from_timespec, f32 *: f32_from_timespec, double *: double_from_timespec, float *: float_from_timespec)(ts,to)
+#endif
+
+void f64_from_timespec(timespec_t ts, f64 * r);
+void f32_from_timespec(timespec_t ts, f32 * r);
+void double_from_timespec(timespec_t ts, double * r);
+void float_from_timespec(timespec_t ts, float * r);
+
+timespec_t timespec_add(timespec_t a, timespec_t b);
+timespec_t timespec_sub(timespec_t a, timespec_t b);
+/* -1, 0, 1 */
+int timespec_cmp(timespec_t a, timespec_t b);
+timespec_t timespec_max(timespec_t a, timespec_t b);
+timespec_t timespec_min(timespec_t a, timespec_t b);
+#endif /* TIMESPEC_H */