ash,hush: history builtin

function                                             old     new   delta
show_history                                           -      39     +39
builtin_history                                        -      16     +16
historycmd                                             -      13     +13
bltins1                                              312     324     +12
builtintab                                           336     344      +8
popstring                                            134     140      +6
hush_main                                           1048    1046      -2
ash_main                                            1398    1396      -2
size_from_HISTFILESIZE                                44      40      -4
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 3/3 up/down: 94/-8)              Total: 86 bytes

Signed-off-by: Flemming Madsen <busybox@themadsens.dk>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

4 files changed, 45 insertions, 3 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 6dd4d7c..b5d1156 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1436,7 +1436,7 @@ void read_key_ungets(char *buffer, const char *str, unsigned len) FAST_FUNC;
 /* It's NOT just ENABLEd or disabled. It's a number: */
 # 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);
+unsigned size_from_HISTFILESIZE(const char *hp) FAST_FUNC;
 # else
 #  define MAX_HISTORY 0
 # endif
@@ -1478,6 +1478,7 @@ line_input_t *new_line_input_t(int flags) FAST_FUNC;
  * >0 length of input string, including terminating '\n'
  */
 int read_line_input(line_input_t *st, const char *prompt, char *command, int maxsize, int timeout) FAST_FUNC;
+void show_history(const line_input_t *st) FAST_FUNC;
 # if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
 void save_history(line_input_t *st);
 # endif
diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 93ab864..1313dd5 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -1254,7 +1254,7 @@ line_input_t* FAST_FUNC new_line_input_t(int flags)
 
 #if MAX_HISTORY > 0
 
-unsigned size_from_HISTFILESIZE(const char *hp)
+unsigned FAST_FUNC size_from_HISTFILESIZE(const char *hp)
 {
 	int size = MAX_HISTORY;
 	if (hp) {
@@ -1309,6 +1309,17 @@ static int get_next_history(void)
 	return 0;
 }
 
+/* Lists command history. Used by shell 'history' builtins */
+void FAST_FUNC show_history(const line_input_t *st)
+{
+	int i;
+
+	if (!st)
+		return;
+	for (i = 0; i < st->cnt_history; i++)
+		printf("%4d %s\n", i, st->history[i]);
+}
+
 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
 /* We try to ensure that concurrent additions to the history
  * do not overwrite each other.
@@ -2749,8 +2760,9 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
 	free(command_ps);
 #endif
 
-	if (command_len > 0)
+	if (command_len > 0) {
 		remember_in_history(command);
+	}
 
 	if (break_out > 0) {
 		command[command_len++] = '\n';
diff --git a/shell/ash.c b/shell/ash.c
index edcb7c0..6af14f5 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -9033,6 +9033,9 @@ static int getoptscmd(int, char **) FAST_FUNC;
 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
 static int helpcmd(int, char **) FAST_FUNC;
 #endif
+#if MAX_HISTORY
+static int historycmd(int, char **) FAST_FUNC;
+#endif
 #if ENABLE_SH_MATH_SUPPORT
 static int letcmd(int, char **) FAST_FUNC;
 #endif
@@ -9106,6 +9109,9 @@ static const struct builtincmd builtintab[] = {
 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
 	{ BUILTIN_NOSPEC        "help"    , helpcmd    },
 #endif
+#if MAX_HISTORY
+	{ BUILTIN_NOSPEC        "history" , historycmd },
+#endif
 #if JOBS
 	{ BUILTIN_REGULAR       "jobs"    , jobscmd    },
 	{ BUILTIN_REGULAR       "kill"    , killcmd    },
@@ -12621,6 +12627,15 @@ helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
 }
 #endif /* FEATURE_SH_EXTRA_QUIET */
 
+#if MAX_HISTORY
+static int FAST_FUNC
+historycmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
+{
+	show_history(line_input_state);
+	return EXIT_SUCCESS;
+}
+#endif
+
 /*
  * The export and readonly commands.
  */
diff --git a/shell/hush.c b/shell/hush.c
index 1d421dc..7cebe17 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -850,6 +850,9 @@ static int builtin_jobs(char **argv) FAST_FUNC;
 #if ENABLE_HUSH_HELP
 static int builtin_help(char **argv) FAST_FUNC;
 #endif
+#if MAX_HISTORY
+static int builtin_history(char **argv) FAST_FUNC;
+#endif
 #if ENABLE_HUSH_LOCAL
 static int builtin_local(char **argv) FAST_FUNC;
 #endif
@@ -919,6 +922,9 @@ static const struct built_in_command bltins1[] = {
 #if ENABLE_HUSH_HELP
 	BLTIN("help"     , builtin_help    , NULL),
 #endif
+#if MAX_HISTORY
+	BLTIN("history"  , builtin_history , "Show command history"),
+#endif
 #if ENABLE_HUSH_JOB
 	BLTIN("jobs"     , builtin_jobs    , "List jobs"),
 #endif
@@ -8627,6 +8633,14 @@ static int FAST_FUNC builtin_help(char **argv UNUSED_PARAM)
 }
 #endif
 
+#if MAX_HISTORY
+static int FAST_FUNC builtin_history(char **argv UNUSED_PARAM)
+{
+	show_history(G.line_input_state);
+	return EXIT_SUCCESS;
+}
+#endif
+
 #if ENABLE_HUSH_JOB
 static int FAST_FUNC builtin_jobs(char **argv UNUSED_PARAM)
 {