From 26685f5203bc38cfa082b96182a406f4f7e6435a Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <kwojtus@protonmail.com>
Date: Mon, 30 Dec 2019 14:36:31 +0100
Subject: implement getchar() and putchar() in terms of supervisor call

---
 PL0_utils.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 PL0_utils.c

(limited to 'PL0_utils.c')

diff --git a/PL0_utils.c b/PL0_utils.c
new file mode 100644
index 0000000..2cede90
--- /dev/null
+++ b/PL0_utils.c
@@ -0,0 +1,27 @@
+#include <stddef.h>
+#include <stdint.h>
+
+#include "svc_interface.h"
+
+// most generic definition possible
+// the actual function defined in svc.S
+uint32_t svc(enum svc_type, ...);
+
+void putchar(int character)
+{
+  svc(UART_PUTCHAR, character);
+}
+
+int getchar(void)
+{
+  return svc(UART_GETCHAR);
+}
+
+void puts(char *string)
+{
+  for (size_t i = 0; string[i]; i++)
+    putchar(string[i]);
+
+  putchar('\n');
+  putchar('\r');
+}
-- 
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