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>

3 files changed, 20 insertions, 3 deletions

diff --git a/shell/Config.src b/shell/Config.src
index e96c21620..b31e62dda 100644
--- a/shell/Config.src
+++ b/shell/Config.src
@@ -136,4 +136,14 @@ config FEATURE_SH_NOFORK
           This feature is relatively new. Use with care. Report bugs
           to project mailing list.
 
+config FEATURE_SH_HISTFILESIZE
+        bool "Use $HISTFILESIZE"
+        default y
+        depends on HUSH || ASH
+        help
+          This option makes busybox shells to use $HISTFILESIZE variable
+          to set shell history size. Note that its max value is capped
+          by "History size" setting in library tuning section.
+
+
 endmenu
diff --git a/shell/ash.c b/shell/ash.c
index 1520c5ae5..11ba9774a 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -13143,10 +13143,9 @@ int ash_main(int argc UNUSED_PARAM, char **argv)
 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
         if (iflag) {
                 const char *hp = lookupvar("HISTFILE");
-
-                if (hp == NULL) {
+                if (!hp) {
                         hp = lookupvar("HOME");
-                        if (hp != NULL) {
+                        if (hp) {
                                 char *defhp = concat_path_file(hp, ".ash_history");
                                 setvar("HISTFILE", defhp, 0);
                                 free(defhp);
@@ -13195,6 +13194,10 @@ int ash_main(int argc UNUSED_PARAM, char **argv)
                         const char *hp = lookupvar("HISTFILE");
                         if (hp)
                                 line_input_state->hist_file = hp;
+# if ENABLE_FEATURE_SH_HISTFILESIZE
+                        hp = lookupvar("HISTFILESIZE");
+                        line_input_state->max_history = size_from_HISTFILESIZE(hp);
+# endif
                 }
 #endif
  state4: /* XXX ??? - why isn't this before the "if" statement */
diff --git a/shell/hush.c b/shell/hush.c
index e698e6c52..d3e957c2f 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -7614,6 +7614,10 @@ int hush_main(int argc, char **argv)
                                 //set_local_var(xasprintf("HISTFILE=%s", ...));
                         }
                 }
+# if ENABLE_FEATURE_SH_HISTFILESIZE
+                hp = get_local_var_value("HISTFILESIZE");
+                G.line_input_state->max_history = size_from_HISTFILESIZE(hp);
+# endif
         }
 # endif
 #endif