Adding string.h & printf()

1 files changed, 37 insertions, 0 deletions

diff --git a/src/stdio.c b/src/stdio.c
new file mode 100644
index 0000000..31f7dbc
--- /dev/null
+++ b/src/stdio.c
@@ -0,0 +1,37 @@
+#include<stdbool.h>
+#include<stddef.h>
+#include<stdint.h>
+#include<stdarg.h>
+#include"string.h"
+
+void terminal_putchar(char c);
+void terminal_writestring(const char* data);
+void terminal_writeint(const uint32_t data);
+
+void printf(char *str, ...)
+{
+    size_t count=0;
+    for(size_t i=0;str[i]!='\0';i++) if(str[i]=='%') count++;
+
+    va_list list;
+    va_start(list, str);
+
+    for(size_t i=0;str[i]!='\0';i++)
+    {
+	if(str[i]=='%')
+	{
+	    i++;
+	    if(str[i]=='c') terminal_putchar(va_arg(list,int));
+	    else if(str[i]=='s') terminal_writestring(va_arg(list,char*));
+	    else if(str[i]=='d') terminal_writeint(va_arg(list,int));
+	    else
+	    {
+		terminal_writestring("wrong format using print function\n");
+		return;
+	    }
+	}
+	else terminal_putchar(str[i]);
+    }
+
+    va_end(list);
+}