separate video stuff into its own file

1 files changed, 37 insertions, 0 deletions

diff --git a/util.h b/util.h
new file mode 100644
index 0000000..4db637a
--- /dev/null
+++ b/util.h
@@ -0,0 +1,37 @@
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <time.h>
+#include <stdio.h>
+#include "ds.h"
+
+static char *va_sprintf(const char *fmt, va_list args) {
+	va_list args_copy;
+	va_copy(args_copy, args);
+	char fakebuf[2] = {0};
+	int ret = vsnprintf(fakebuf, 1, fmt, args_copy);
+	va_end(args_copy);
+	
+	if (ret < 0) return NULL; // bad format or something
+	size_t n = (size_t)ret;
+	char *str = calloc(1, n + 1);
+	vsnprintf(str, n + 1, fmt, args);
+	return str;
+}
+
+static char *a_sprintf(PRINTF_FORMAT_STRING const char *fmt, ...) ATTRIBUTE_PRINTF(1, 2);
+static char *a_sprintf(const char *fmt, ...) {
+	// idk if you can always just pass NULL to vsnprintf
+	va_list args;
+	va_start(args, fmt);
+	char *str = va_sprintf(fmt, args);
+	va_end(args);
+	return str;
+}
+
+
+static double get_time_double(void) {
+	struct timespec ts = {0};
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	return (double)ts.tv_sec + (double)ts.tv_nsec * 1e-9;
+}