lineedit: move console viewport to cursor on keypress

When a normal *nix terminal has been scrolled back through its
buffer, any keypress will return to the cursor position.  Add code
to lineedit.c to do the same for the Windows console.

1 files changed, 5 insertions, 0 deletions

diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 04361b509..e7b9ddfa1 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -2440,6 +2440,11 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
 
                 fflush_all();
                 ic = ic_raw = lineedit_read_key(read_key_buffer, timeout);
+#if ENABLE_PLATFORM_MINGW32
+                /* scroll to cursor position on any keypress */
+                if (isatty(fileno(stdin)) && isatty(fileno(stdout)))
+                        move_cursor_row(0);
+#endif
 
 #if ENABLE_FEATURE_REVERSE_SEARCH
  again: