ash: add title built-in

Implement a 'title' built-in for ash.  It's very simple-minded,
performs almost no error checking and is completely non-portable.

- With no arguments it prints the current console title.

- If arguments are provided the *first only* is set as the console
  title.

Costs 88-116 bytes.

(GitHub issue #401)

1 files changed, 1 insertions, 0 deletions

diff --git a/include/mingw.h b/include/mingw.h
index 4abdcf459..41d4cd940 100644
--- a/include/mingw.h
+++ b/include/mingw.h
@@ -158,6 +158,7 @@ BOOL conToCharA(LPSTR d);
 BOOL readConsoleInput_utf8(HANDLE h, INPUT_RECORD *r, DWORD len, DWORD *got);
 
 void set_title(const char *str);
+int get_title(char *buf, int len);
 void move_cursor_row(int n);
 void reset_screen(void);
 int winansi_putchar(int c);