Fix bug with printf %d, add support for %u

maximecb · Dec 2, 2023 · 20eaadd · 20eaadd
1 parent 845a68f
commit 20eaadd
Showing 1 changed file with 19 additions and 3 deletions.
diff --git a/ncc/include/stdio.h b/ncc/include/stdio.h
@@ -71,14 +71,32 @@ int printf(char* format, ...)
                 continue;
             }
 
-            // Decimal integer
+            // Signed decimal integer
             if (format[i+1] == 'd' || format[i+1] == 'i')
             {
                 ++i;
 
                 // Get the integer argument and print it
                 asm (var_arg_idx) -> void {
                     get_var_arg;
+                    trunc_u32;
+                    sx_i32_i64;
+                    syscall print_i64;
+                };
+                ++var_arg_idx;
+
+                continue;
+            }
+
+            // Unsigned decimal integer
+            if (format[i+1] == 'u')
+            {
+                ++i;
+
+                // Get the integer argument and print it
+                asm (var_arg_idx) -> void {
+                    get_var_arg;
+                    trunc_u32;
                     syscall print_i64;
                 };
                 ++var_arg_idx;
@@ -90,8 +108,6 @@ int printf(char* format, ...)
 
             // TODO: %p for printing pointers
 
-            // TODO: %f for printing floats
-
             // Floats (f32)
             if (format[i+1] == 'f')
             {