libbb/lineedit: fix the case when we configured history to have 0 lines

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

2 files changed, 21 insertions, 19 deletions

diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 38c69c602..3689b4b5d 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -1095,15 +1095,15 @@ static void save_command_ps_at_cur_history(void)
                 int cur = state->cur_history;
                 free(state->history[cur]);
 
-#if ENABLE_FEATURE_ASSUME_UNICODE
+# if ENABLE_FEATURE_ASSUME_UNICODE
                 {
                         char tbuf[MAX_LINELEN];
                         save_string(tbuf, sizeof(tbuf));
                         state->history[cur] = xstrdup(tbuf);
                 }
-#else
+# else
                 state->history[cur] = xstrdup(command_ps);
-#endif
+# endif
         }
 }
 
@@ -1131,7 +1131,7 @@ static int get_next_history(void)
         return 0;
 }
 
-#if ENABLE_FEATURE_EDITING_SAVEHISTORY
+# if ENABLE_FEATURE_EDITING_SAVEHISTORY
 /* We try to ensure that concurrent additions to the history
  * do not overwrite each other.
  * Otherwise shell users get unhappy.
@@ -1256,10 +1256,10 @@ static void save_history(char *str)
                 free_line_input_t(st_temp);
         }
 }
-#else
-#define load_history(a) ((void)0)
-#define save_history(a) ((void)0)
-#endif /* FEATURE_COMMAND_SAVEHISTORY */
+# else
+#  define load_history(a) ((void)0)
+#  define save_history(a) ((void)0)
+# endif /* FEATURE_COMMAND_SAVEHISTORY */
 
 static void remember_in_history(char *str)
 {
@@ -1290,15 +1290,15 @@ static void remember_in_history(char *str)
         /* i <= MAX_HISTORY */
         state->cur_history = i;
         state->cnt_history = i;
-#if ENABLE_FEATURE_EDITING_SAVEHISTORY
+# if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
         if ((state->flags & SAVE_HISTORY) && state->hist_file)
                 save_history(str);
-#endif
+# endif
         IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
 }
 
 #else /* MAX_HISTORY == 0 */
-#define remember_in_history(a) ((void)0)
+# define remember_in_history(a) ((void)0)
 #endif /* MAX_HISTORY */
 
 
@@ -1476,11 +1476,11 @@ static void parse_and_put_prompt(const char *prmt_ptr)
                                 c = *prmt_ptr++;
 
                                 switch (c) {
-#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
+# if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
                                 case 'u':
                                         pbuf = user_buf ? user_buf : (char*)"";
                                         break;
-#endif
+# endif
                                 case 'h':
                                         pbuf = free_me = safe_gethostname();
                                         *strchrnul(pbuf, '.') = '\0';
@@ -1488,7 +1488,7 @@ static void parse_and_put_prompt(const char *prmt_ptr)
                                 case '$':
                                         c = (geteuid() == 0 ? '#' : '$');
                                         break;
-#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
+# if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
                                 case 'w':
                                         /* /home/user[/something] -> ~[/something] */
                                         pbuf = cwd_buf;
@@ -1501,7 +1501,7 @@ static void parse_and_put_prompt(const char *prmt_ptr)
                                                 pbuf = free_me = xasprintf("~%s", cwd_buf + l);
                                         }
                                         break;
-#endif
+# endif
                                 case 'W':
                                         pbuf = cwd_buf;
                                         cp = strrchr(pbuf, '/');
@@ -1688,13 +1688,15 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
 
         /* With null flags, no other fields are ever used */
         state = st ? st : (line_input_t*) &const_int_0;
-#if ENABLE_FEATURE_EDITING_SAVEHISTORY
+#if MAX_HISTORY > 0
+# if ENABLE_FEATURE_EDITING_SAVEHISTORY
         if ((state->flags & SAVE_HISTORY) && state->hist_file)
                 if (state->cnt_history == 0)
                         load_history(state);
-#endif
+# endif
         if (state->flags & DO_HISTORY)
                 state->cur_history = state->cnt_history;
+#endif
 
         /* prepare before init handlers */
         cmdedit_y = 0;  /* quasireal y, not true if line > xt*yt */
@@ -1716,7 +1718,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
         new_settings.c_cc[VTIME] = 0;
         /* Turn off CTRL-C, so we can trap it */
 #ifndef _POSIX_VDISABLE
-#define _POSIX_VDISABLE '\0'
+# define _POSIX_VDISABLE '\0'
 #endif
         new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
         tcsetattr_stdin_TCSANOW(&new_settings);
diff --git a/shell/ash.c b/shell/ash.c
index d7355ce81..952961373 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -13317,7 +13317,7 @@ int ash_main(int argc UNUSED_PARAM, char **argv)
         }
 
         if (sflag || minusc == NULL) {
-#if ENABLE_FEATURE_EDITING_SAVEHISTORY
+#if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
                 if (iflag) {
                         const char *hp = lookupvar("HISTFILE");
                         if (hp)