Added missing prototype for puts() in stdio.h.

Implemented a basic serial interface using COM0 which can be accessed
with the system call sys_puts as well as the library functions rsputs()
and rsprintf().

Renamed puts() in con.c to con_puts() and made the function static to
avoid interference with the library function puts().

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/stdio.c b/lib/stdio.c
index 912fd17..a718ee4 100644
--- a/lib/stdio.c
+++ b/lib/stdio.c
@@ -3,6 +3,7 @@
 #include <unistd.h>
 
 _syscall1(int, puts, char*, s);
+_syscall1(int, rsputs, char*, s);
 
 int printf(char *fmt, ...) {
   int ret;
@@ -16,3 +17,16 @@ int printf(char *fmt, ...) {
   puts(buf);
   return ret;
 }
+
+int rsprintf(char *fmt, ...) {
+  int ret;
+  char buf[1024];
+  va_list ap;
+
+  va_start(ap, fmt);
+  ret = vsprintf(buf, fmt, ap);
+  va_end(ap);
+
+  rsputs(buf);
+  return ret;
+}