hush: allocate line edit buffer only for interactive shell

function                                             old     new   delta
builtin_history                                       16      20      +4

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

diff --git a/shell/hush.c b/shell/hush.c
index 9dd893aa65729ac4b1d3dfe05633236eda3b7c96..4dd940222199169a8c710995c27cc567c7e8a86b 100644 (file)
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -2032,7 +2032,8 @@ static sighandler_t pick_sighandler(unsigned sig)
 static void hush_exit(int exitcode)
 {
 #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
-       save_history(G.line_input_state);
+       if (G.line_input_state)
+               save_history(G.line_input_state);
 #endif
 
        fflush_all();
@@ -6412,6 +6413,8 @@ static NOINLINE int expand_one_var(o_string *output, int n,
                         * commands read but are not executed,
                         * so $- can not execute too, 'n' is never seen in $-.
                         */
+//TODO: show 'c' if executed via "hush -c 'CMDS'" (bash only, not ash)
+//TODO: show 's' if executed via "hush -s ARG1 ARG2", or if there were no args except options (ash does this too)
                        *cp = '\0';
                        break;
                }
@@ -9955,9 +9958,6 @@ int hush_main(int argc, char **argv)
         * PS4='+ '
         */
 
-#if ENABLE_FEATURE_EDITING
-       G.line_input_state = new_line_input_t(FOR_SHELL);
-#endif
 
        /* Initialize some more globals to non-zero values */
        die_func = restore_ttypgrp_and__exit;
@@ -10245,6 +10245,9 @@ int hush_main(int argc, char **argv)
                }
                enable_restore_tty_pgrp_on_exit();
 
+# if ENABLE_FEATURE_EDITING
+               G.line_input_state = new_line_input_t(FOR_SHELL);
+# endif
 # if ENABLE_HUSH_SAVEHISTORY && MAX_HISTORY > 0
                {
                        const char *hp = get_local_var_value("HISTFILE");
@@ -10372,7 +10375,8 @@ static int FAST_FUNC builtin_help(char **argv UNUSED_PARAM)
 #if MAX_HISTORY && ENABLE_FEATURE_EDITING
 static int FAST_FUNC builtin_history(char **argv UNUSED_PARAM)
 {
-       show_history(G.line_input_state);
+       if (G.line_input_state)
+               show_history(G.line_input_state);
        return EXIT_SUCCESS;
 }
 #endif