feat(ex00): is done

ex00/src/utils.c

@@ -0,0 +1,39 @@
+#include "utils.h"
+#include "mystd.h"
+
+// this just burns cycles.
+// the volatile is important, it means that the cpu can't optimize any
+// read/writes for the value
+static inline void spin_loop(volatile uint16_t counts) {
+	while (counts)
+		counts--;
+}
+
+void delay_ms(uint16_t ms) {
+	while (ms) {
+		// this value was taken using a delay of 500ms, and just recording the led
+		// blinking. it seems to be high enough such that each loop of delay_loop
+		// takes 1ms :D
+		spin_loop((F_CPU) / 5000);
+		ms--;
+	}
+}
+
+void ft_bzero(void* data, uint16_t size) {
+	char* d = data;
+	while (size) {
+		*d = 0;
+		d++;
+		size--;
+	}
+}
+
+uint8_t ft_stridx(const char* str, char chr) {
+	if (!str)
+		return -1;
+	for (uint8_t i = 0; str[i]; i++) {
+		if (str[i] == chr)
+			return i;
+	}
+	return -1;
+}