From dd6656f7132d1727a055035ca94945fa4fbaae58 Mon Sep 17 00:00:00 2001
From: Danny Holman <dholman@gymli.xyz>
Date: Wed, 20 Jan 2021 22:51:46 -0600
Subject: serial: add serial_writestring as a function

Add a function in the serial interface that writes an entire string to
the serial line.

Signed-off-by: Danny Holman <dholman@gymli.xyz>
---
 arch/i386/serial.c      | 7 +++++++
 include/kernel/serial.h | 1 +
 kernel/init.c           | 1 +
 3 files changed, 9 insertions(+)

diff --git a/arch/i386/serial.c b/arch/i386/serial.c
index c1266bb..20bd8f9 100644
--- a/arch/i386/serial.c
+++ b/arch/i386/serial.c
@@ -1,4 +1,6 @@
 #include <kernel/serial.h>
+#include <kernel/string.h>
+#include <stddef.h>
 #include "pic.h"
 
 #define PORT 0x3f8
@@ -38,3 +40,8 @@ void write_serial(char a) {
         while (is_transmit_empty() == 0);
         outb(PORT, a);
 }
+
+void serial_writestring(const char *str) {
+        for (size_t i = 0; i < strlen(str); i++)
+                write_serial(str[i]);
+}
diff --git a/include/kernel/serial.h b/include/kernel/serial.h
index 79d856b..a815766 100644
--- a/include/kernel/serial.h
+++ b/include/kernel/serial.h
@@ -4,5 +4,6 @@
 int serial_init(void);
 char read_serial(void);
 void write_serial(char a);
+void serial_writestring(const char *str);
 
 #endif
diff --git a/kernel/init.c b/kernel/init.c
index b808122..a7a71d6 100644
--- a/kernel/init.c
+++ b/kernel/init.c
@@ -5,5 +5,6 @@
 void kernel_main(void) {
         tty_init();
         serial_init();
+        serial_writestring("Hello world\n");
         printf("Hello world\n");
 }
-- 
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