feature: multiple screens + cursor move (bug to fix)

style: reorganise code structure

src/kprint/kvprintf.c

@@ -0,0 +1,43 @@
+#include "ctype.h"
+#include "kprintf.h"
+#include "stdlib.h"
+#include "string.h"
+#include "terminal.h"
+
+#include <stdarg.h>
+
+static int print_flag(char flag, va_list *ap)
+{
+	switch (flag) {
+	case '%':
+		return terminal_putchar('%');
+	case 'i':
+		return terminal_writelong(va_arg(*ap, int));
+	case 'd':
+		return terminal_writelong(va_arg(*ap, int));
+	case 'c':
+		return terminal_putchar(va_arg(*ap, int));
+	case 's':
+		return terminal_writestring(va_arg(*ap, char *));
+	}
+	return 0;
+}
+
+int kvprintf(int level, const char *restrict format, va_list ap)
+{
+	const char *start = format;
+	int ret = 0;
+
+	(void)level;
+	while (*start != '\0') {
+		if (*start == '%' && *(start + 1) != '\0') {
+			ret += print_flag(*(start + 1), &ap);
+			start++;
+		} else {
+			ret += terminal_putchar(*start);
+		}
+		start++;
+	}
+	update_cursor();
+	return ret;
+}