ash,hush: optional support for $HISTFILESIZE.

Based on patch from Alexey Fomenko (ext-alexey.fomenko AT nokia.com)

function                                             old     new   delta
size_from_HISTFILESIZE                                 -      44     +44
hush_main                                            998    1025     +27
ash_main                                            1348    1374     +26
read_line_input                                     3361    3372     +11
new_line_input_t                                      17      24      +7

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

1 files changed, 3 insertions, 1 deletions

diff --git a/include/libbb.h b/include/libbb.h
index c371e35f2..f2f3313b4 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1373,8 +1373,9 @@ void read_key_ungets(char *buffer, const char *str, unsigned len) FAST_FUNC;
 
 #if ENABLE_FEATURE_EDITING
 /* It's NOT just ENABLEd or disabled. It's a number: */
-# ifdef CONFIG_FEATURE_EDITING_HISTORY
+# if defined CONFIG_FEATURE_EDITING_HISTORY && CONFIG_FEATURE_EDITING_HISTORY > 0
 #  define MAX_HISTORY (CONFIG_FEATURE_EDITING_HISTORY + 0)
+unsigned size_from_HISTFILESIZE(const char *hp);
 # else
 #  define MAX_HISTORY 0
 # endif
@@ -1384,6 +1385,7 @@ typedef struct line_input_t {
 # if MAX_HISTORY
         int cnt_history;
         int cur_history;
+        int max_history; /* must never be <= 0 */
 #  if ENABLE_FEATURE_EDITING_SAVEHISTORY
         unsigned cnt_history_in_file;
         const char *hist_file;