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>

1 files changed, 7 insertions, 0 deletions

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]);
+}