From e11298e56be560de64bbccfe74fef7ff85c623d1 Mon Sep 17 00:00:00 2001
From: Aleksa Vuckovic <aleksav013@gmail.com>
Date: Mon, 8 Aug 2022 21:25:55 +0200
Subject: stdio.h; gcc $(WARNINGS)

---
 kernel/src/libk/stdio.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 kernel/src/libk/stdio.c

(limited to 'kernel/src/libk/stdio.c')

diff --git a/kernel/src/libk/stdio.c b/kernel/src/libk/stdio.c
new file mode 100644
index 0000000..b8ddb67
--- /dev/null
+++ b/kernel/src/libk/stdio.c
@@ -0,0 +1,76 @@
+#include <types.h>
+#include <libk/stdio.h>
+
+#include <stdarg.h>
+#include <libk/string.h>
+#include <graphics.h>
+
+int32_t x;
+int32_t y;
+
+inline void print_char(char c)
+{
+	if (c == '\n') {
+		x = 0;
+		y++;
+		return;
+	}
+	if (c == '\b') {
+		if (x != 0) {
+			x--;
+		}
+		return;
+	}
+	if (x * 8 >= (int32_t)main_fb.width) {
+		x = 0;
+		y++;
+	}
+	if (y * 16 >= (int32_t)main_fb.height) {
+		x = 0;
+		y = 0;
+	}
+	fb_draw_character(main_fb, c, x * 8, y * 16, WHITE, BLACK);
+	x++;
+}
+
+inline void print_string(const char* s)
+{
+	for (size_t i = 0; i < strlen(s); i++) {
+		print_char(s[i]);
+	}
+}
+
+inline void print_int(uint64_t num)
+{
+	char a[100];
+	itos(num, a);
+	print_string(a);
+}
+
+void 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') 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
+			{
+				print_string("Wrong format using printf\n");
+				return;
+			}
+		}
+		else print_char(s[i]);
+	}
+
+	va_end(list);
+}
-- 
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