adds some more data types for printf, and moves gdt_init to a different file

libc/stdio/printf.c

@@ -3,6 +3,7 @@
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
+#include <stdint.h>
 
 #include <kernel/_kernel.h>
 
@@ -19,6 +20,58 @@ static void reverse(char* buf, int len)
 	}
 }
 
+static char* s64toa(int64_t num, char* buf, int base)
+{
+	int i = 0;
+	bool neg = false;
+	
+	if (num == 0) { // Handle zero explicitly
+		buf[i++] = '0';
+		buf[i] = '\0';
+		return buf;
+	}
+
+	if (num < 0 && base == 10) { // only handle negative on base10
+		neg = true;
+		num = -num;
+	}
+
+	while (num != 0) {
+		int rem = num % base;
+		buf[i++] = (rem > 9) ? (rem - 10) + 'a' : rem + '0';
+		num = num / base;
+	}
+
+	if (neg) // lets reapply the negative sign
+		buf[i++] = '-'; 
+
+	buf[i] = '\0';
+
+	reverse(buf, i); // reverse, since we did it backwards!
+	return buf;
+}
+
+static char* u64toa(uint64_t num, char* buf, int base)
+{
+	int i = 0;
+	if (num == 0) { // Handle zero explicitly
+		buf[i++] = '0';
+		buf[i] = '\0';
+		return buf;
+	}
+
+	while (num != 0) {
+		int rem = num % base;
+		buf[i++] = (rem > 9) ? (rem - 10) + 'a' : rem + '0';
+		num = num / base;
+	}
+
+	buf[i] = '\0';
+
+	reverse(buf, i); // reverse, since we did it backwards!
+	return buf;
+}
+
 static char* itoa(int num, char* buf, int base)
 {
 	int i = 0;
@@ -132,6 +185,30 @@ int printf(const char* restrict format, ...) {
 			if (!print(buffer, len))
 				return -1;
 			written += len;
+		} else if (*format == '1') {
+			format++;
+			uint64_t i = (uint64_t) va_arg(parameters, uint64_t);
+			u64toa(i, buffer, 16);
+			size_t len = strlen(buffer);
+			if (maxrem < len) {
+				// TODO: Set errno to EOVERFLOW.
+				return -1;
+			}
+			if (!print(buffer, len))
+				return -1;
+			written += len;
+		} else if (*format == '2') {
+			format++;
+			int64_t i = (int64_t) va_arg(parameters, int64_t);
+			s64toa(i, buffer, 16);
+			size_t len = strlen(buffer);
+			if (maxrem < len) {
+				// TODO: Set errno to EOVERFLOW.
+				return -1;
+			}
+			if (!print(buffer, len))
+				return -1;
+			written += len;
 		} else {
 			format = format_begun_at;
 			size_t len = strlen(format);