less: handle yet another Home/End key sequence; expand a comment

1 files changed, 13 insertions, 4 deletions

diff --git a/miscutils/less.c b/miscutils/less.c
index 31055a6c7..79732cc41 100644
--- a/miscutils/less.c
+++ b/miscutils/less.c
@@ -48,8 +48,10 @@ enum {
         REAL_KEY_LEFT = 'D',
         REAL_PAGE_UP = '5',
         REAL_PAGE_DOWN = '6',
-        REAL_KEY_HOME = '7',
+        REAL_KEY_HOME = '7', // vt100? linux vt? or what?
         REAL_KEY_END = '8',
+        REAL_KEY_HOME_ALT = '1', // ESC [1~ (vt100? linux vt? or what?)
+        REAL_KEY_END_ALT = '4', // ESC [4~ 
         REAL_KEY_HOME_XTERM = 'H',
         REAL_KEY_END_XTERM = 'F',
 
@@ -213,9 +215,12 @@ static void read_lines(void)
                                         if (errno == EAGAIN && !yielded) {
                         /* We can hit EAGAIN while searching for regexp match.
                          * Yield is not 100% reliable solution in general,
-                         * but for less it should be good enough.
-                         * We give stdin supplier some CPU time to produce more.
-                         * We do it just once. */
+                         * but for less it should be good enough -
+                         * we give stdin supplier some CPU time to produce
+                         * more input. We do it just once.
+                         * Currently, we do not stop when we found the Nth
+                         * occurrence we were looking for. We read till end
+                         * (or double EAGAIN). TODO? */
                                                 sched_yield();
                                                 yielded = 1;
                                                 goto read_again;
@@ -638,8 +643,12 @@ static int less_getch(void)
                         return 24 + i;
                 if (input[2] == REAL_KEY_HOME_XTERM)
                         return KEY_HOME;
+                if (input[2] == REAL_KEY_HOME_ALT)
+                        return KEY_HOME;
                 if (input[2] == REAL_KEY_END_XTERM)
                         return KEY_END;
+                if (input[2] == REAL_KEY_END_ALT)
+                        return KEY_END;
                 return 0;
         }
         /* Reject almost all control chars */