Add comments in keyboard escape sequences table

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/libbb/read_key.c b/libbb/read_key.c
index 8d72d2a..ace23de 100644 (file)
--- a/libbb/read_key.c
+++ b/libbb/read_key.c
@@ -15,7 +15,10 @@ int64_t FAST_FUNC read_key(int fd, char *buffer, int timeout)
        const char *seq;
        int n;
 
-       /* Known escape sequences for cursor and function keys */
+       /* Known escape sequences for cursor and function keys.
+        * See "Xterm Control Sequences"
+        * http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
+        */
        static const char esccmds[] ALIGN1 = {
                'O','A'        |0x80,KEYCODE_UP      ,
                'O','B'        |0x80,KEYCODE_DOWN    ,
@@ -44,6 +47,8 @@ int64_t FAST_FUNC read_key(int fd, char *buffer, int timeout)
                /* ESC [ 1 ; 4 x, where x = A/B/C/D: Alt-Shift-<arrow> */
                /* ESC [ 1 ; 5 x, where x = A/B/C/D: Ctrl-<arrow> - implemented below */
                /* ESC [ 1 ; 6 x, where x = A/B/C/D: Ctrl-Shift-<arrow> */
+               /* ESC [ 1 ; 7 x, where x = A/B/C/D: Ctrl-Alt-<arrow> */
+               /* ESC [ 1 ; 8 x, where x = A/B/C/D: Ctrl-Alt-Shift-<arrow> */
                '[','H'        |0x80,KEYCODE_HOME    , /* xterm */
                '[','F'        |0x80,KEYCODE_END     , /* xterm */
                /* [ESC] ESC [ [2] H - [Alt-][Shift-]Home (End similarly?) */
@@ -64,10 +69,10 @@ int64_t FAST_FUNC read_key(int fd, char *buffer, int timeout)
                '[','7','~'    |0x80,KEYCODE_HOME    , /* vt100? linux vt? or what? */
                '[','8','~'    |0x80,KEYCODE_END     , /* vt100? linux vt? or what? */
 #if 0
-               '[','1','1','~'|0x80,KEYCODE_FUN1    ,
-               '[','1','2','~'|0x80,KEYCODE_FUN2    ,
-               '[','1','3','~'|0x80,KEYCODE_FUN3    ,
-               '[','1','4','~'|0x80,KEYCODE_FUN4    ,
+               '[','1','1','~'|0x80,KEYCODE_FUN1    , /* old xterm, deprecated by ESC O P */
+               '[','1','2','~'|0x80,KEYCODE_FUN2    , /* old xterm... */
+               '[','1','3','~'|0x80,KEYCODE_FUN3    , /* old xterm... */
+               '[','1','4','~'|0x80,KEYCODE_FUN4    , /* old xterm... */
                '[','1','5','~'|0x80,KEYCODE_FUN5    ,
                /* [ESC] ESC [ 1 5 [;2] ~ - [Alt-][Shift-]F5 */
                '[','1','7','~'|0x80,KEYCODE_FUN6    ,