2 files changed, 35 insertions, 2 deletions
diff --git a/kernel/src/libk/stdio.c b/kernel/src/libk/stdio.c
index b8ddb67..be75b73 100644
--- a/kernel/src/libk/stdio.c
+++ b/kernel/src/libk/stdio.c
@@ -47,6 +47,13 @@ inline void print_int(uint64_t num)
 	print_string(a);
 }
 
+inline void print_hex(uint64_t num)
+{
+	char a[100];
+	itoh(num, a);
+	print_string(a);
+}
+
 void printf(const char *s, ...)
 {
 	size_t count = 0;
@@ -63,6 +70,7 @@ void printf(const char *s, ...)
 			if(s[i] == 'c') print_char((char)va_arg(list, uint32_t));
 			else if(s[i] == 's') print_string(va_arg(list, char*));
 			else if(s[i] == 'd') print_int((uint64_t)va_arg(list, uint64_t));
+			else if(s[i] == 'x') print_hex((uint64_t)va_arg(list, uint64_t));
 			else
 			{
 				print_string("Wrong format using printf\n");
diff --git a/kernel/src/libk/string.c b/kernel/src/libk/string.c
index fde9645..6d7ab69 100644
--- a/kernel/src/libk/string.c
+++ b/kernel/src/libk/string.c
@@ -35,9 +35,34 @@ void strrev(char *s)
 
 void itos(uint64_t num, char* s)
 {
+	if (num == 0) {
+		s[0] = '0';
+		s[1] = '\0';
+		return;
+	}
+
+	size_t i;
+	for (i = 0; num; num /= 10, i++) {
+		s[i] = (char)('0' + num % 10);
+	}
+	s[i] = '\0';
+	strrev(s);
+}
+
+void itoh(uint64_t num, char* s)
+{
+	if (num == 0) {
+		s[0] = '0';
+		s[1] = '\0';
+		return;
+	}
+
 	size_t i;
-	for (i = 0; num; num/=10, i++) {
-		s[i] = (char)('0' + num%10);
+	for (i = 0; num; num /= 16, i++) {
+		if (num % 16 < 10)
+			s[i] = (char)('0' + num % 16);
+		else
+			s[i] = (char)('A' + num % 16 - 10);
 	}
 	s[i] = '\0';
 	strrev(s);