shell: update HISTFILESIZE code to be actually useful

"HISTFILESIZE=0" in profile wasn't working as intended,
"unset HISTFILE" wasn't preventing creation of history files
Now:
HISTSIZE=n      allows to reduce in-memory history buffer
HISTFILESIZE=n  allows to reduce history file size (0: truncate it)
unset HISTFILE  allows to not save history file at all

function                                             old     new   delta
exitshell                                            138     194     +56
hush_exit                                             97     143     +46
save_history                                         266     296     +30
hush_main                                           1170    1186     +16
.rodata                                           105762  105771      +9
load_history                                         246     254      +8
size_from_HISTFILESIZE                                44      41      -3
read_line_input                                     2746    2712     -34
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 6/2 up/down: 165/-37)           Total: 128 bytes

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

1 files changed, 2 insertions, 2 deletions

diff --git a/libbb/Config.src b/libbb/Config.src
index b980f19a9..55e670dcd 100644
--- a/libbb/Config.src
+++ b/libbb/Config.src
@@ -182,8 +182,8 @@ config FEATURE_EDITING_VI
 config FEATURE_EDITING_HISTORY
         int "History size"
         # Don't allow way too big values here, code uses fixed "char *history[N]" struct member
-        range 0 9999
-        default 255
+        range 0 2000
+        default 200
         depends on FEATURE_EDITING
         help
         Specify command history size (0 - disable).