Refactor, move speed parser from getty() to prepare_tty()

This patch relocates the speed parser so that exec.c can set the TTY
speed properly as soon as possible.  For external getty we make sure
to not touch the TTY speed.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/helpers.h

@@ -27,6 +27,8 @@
 
 #include <stdarg.h>
 #include <sys/types.h>
+#include <sys/ttydefaults.h>	/* Not included by default in musl libc */
+#include <termios.h>
 #include <lite/lite.h>
 #include "log.h"
 
@@ -48,7 +50,10 @@ struct fstab *getfsent  (void);
 
 char   *strip_line      (char *line);
 
-int     stty            (int fd, unsigned int speed);
+int     getty           (char *tty, speed_t speed, char *term, char *user);
+
+int     stty            (int fd, speed_t speed);
+speed_t stty_parse_speed(char *baud);
 
 int     pid_alive       (pid_t pid);
 char   *pid_get_name    (pid_t pid, char *name, size_t len);
@@ -66,7 +71,7 @@ int     complete        (char *cmd, int pid);
 int     run             (char *cmd);
 int     run_interactive (char *cmd, char *fmt, ...);
 int     exec_runtask    (char *cmd, char *args[]);
-pid_t   run_getty       (char *tty, char *speed, char *term, int noclear, int nowait);
+pid_t   run_getty       (char *tty, char *baud, char *term,  int noclear, int nowait);
 pid_t   run_getty2      (char *tty, char *cmd, char *args[], int noclear, int nowait);
 int     run_parts       (char *dir, char *cmd);