UBSAN - FINALLY FIXING UNDEFINED BEHAVIOUR

1 files changed, 61 insertions, 0 deletions

diff --git a/kernel/src/libk/serial_stdio.c b/kernel/src/libk/serial_stdio.c
new file mode 100644
index 0000000..a56750b
--- /dev/null
+++ b/kernel/src/libk/serial_stdio.c
@@ -0,0 +1,61 @@
+#include <types.h>
+#include <libk/serial_stdio.h>
+#include <stdarg.h>
+#include <libk/string.h>
+#include <graphics.h>
+#include <serial.h>
+
+void serial_print_char(char c)
+{
+	write_serial(c);
+}
+
+void serial_print_string(const char* s)
+{
+	for (size_t i = 0; i < strlen(s); i++) {
+		serial_print_char(s[i]);
+	}
+}
+
+void serial_print_int(uint64_t num)
+{
+	char a[100];
+	itos(num, a);
+	serial_print_string(a);
+}
+
+void serial_print_hex(uint64_t num)
+{
+	char a[100];
+	itoh(num, a);
+	serial_print_string(a);
+}
+
+void serial_printf(const char *s, ...)
+{
+	size_t count = 0;
+	for(size_t i = 0; i < strlen(s); i++) if(s[i] == '%') count++;
+
+	va_list list;
+	va_start(list, s);
+
+	for(size_t i = 0; i < strlen(s); i++)
+	{
+		if(s[i] == '%')
+		{
+			i++;
+			if(s[i] == 'c') serial_print_char((char)va_arg(list, uint32_t));
+			else if(s[i] == 's') serial_print_string(va_arg(list, char*));
+			else if(s[i] == 'd') serial_print_int((uint64_t)va_arg(list, uint64_t));
+			else if(s[i] == 'x') serial_print_hex((uint64_t)va_arg(list, uint64_t));
+			else
+			{
+				serial_print_string("Wrong format using printf\n");
+				return;
+			}
+		}
+		else serial_print_char(s[i]);
+	}
+
+	va_end(list);
+}