win32: handle various Alt key modifiers in termios

This patch restores support for Bash-stle Alt commands present in the
original BusyBox:

* Alt-b, Alt-LeftArrow     backward word
* Alt-f, Alt-RightArrow    forward word
* Alt-BackSpace            delete word backward
* Alt-d                    delete word forward

1 files changed, 16 insertions, 2 deletions

diff --git a/win32/termios.c b/win32/termios.c
index 25f2ea48c..708acfa9f 100644
--- a/win32/termios.c
+++ b/win32/termios.c
@@ -61,9 +61,7 @@ int64_t FAST_FUNC read_key(int fd, char *buf UNUSED_PARAM, int timeout)
                                 case VK_END:
                                 case VK_DOWN:
                                 case VK_NEXT:
-                                case VK_LEFT:
                                 case VK_CLEAR:
-                                case VK_RIGHT:
                                 case VK_HOME:
                                 case VK_UP:
                                 case VK_PRIOR:
@@ -82,6 +80,10 @@ int64_t FAST_FUNC read_key(int fd, char *buf UNUSED_PARAM, int timeout)
                                         ret = KEYCODE_CTRL_RIGHT;
                                         goto done;
                                 }
+                                if (state & (RIGHT_ALT_PRESSED|LEFT_ALT_PRESSED)) {
+                                        ret = KEYCODE_ALT_RIGHT;
+                                        goto done;
+                                }
                                 ret = KEYCODE_RIGHT;
                                 goto done;
                         case VK_LEFT:
@@ -89,6 +91,10 @@ int64_t FAST_FUNC read_key(int fd, char *buf UNUSED_PARAM, int timeout)
                                         ret = KEYCODE_CTRL_LEFT;
                                         goto done;
                                 }
+                                if (state & (RIGHT_ALT_PRESSED|LEFT_ALT_PRESSED)) {
+                                        ret = KEYCODE_ALT_LEFT;
+                                        goto done;
+                                }
                                 ret = KEYCODE_LEFT;
                                 goto done;
                         case VK_HOME: ret = KEYCODE_HOME; goto done;
@@ -111,6 +117,14 @@ int64_t FAST_FUNC read_key(int fd, char *buf UNUSED_PARAM, int timeout)
                 }
                 ret = record.Event.KeyEvent.uChar.AsciiChar;
 #endif
+                if (state & (RIGHT_ALT_PRESSED|LEFT_ALT_PRESSED)) {
+                        switch (ret) {
+                        case '\b': ret = KEYCODE_ALT_BACKSPACE; goto done;
+                        case 'b': ret = KEYCODE_ALT_LEFT; goto done;
+                        case 'd': ret = KEYCODE_ALT_D; goto done;
+                        case 'f': ret = KEYCODE_ALT_RIGHT; goto done;
+                        }
+                }
                 break;
         }
  done: