vi: further changes to colon addresses

Improved error messages:

- specify when a search fails or a mark isn't set;
- warn when line addresses are out of range or when a range of
  lines is reversed.

Addresses are limited to the number of lines in the file so a
command like ':2000000000' (go to the two billionth line) no
longer causes a long pause.

Improved vi compatibility of '+' and '-' operators that aren't
followed immediately by a number:

   :4+++=       7
   :3-2=        1
   :3 - 2=      4 (yes, really!)

In a command like ':,$' the empty address before the separator now
correctly refers to the current line.  (The similar case ':1,' was
already being handled.)

And all with a tidy reduction in bloat (32-bit build):

function                                             old     new   delta
colon                                               4029    4069     +40
.rodata                                            99348   99253     -95
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 40/-95)            Total: -55 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

0 files changed, 0 insertions, 0 deletions