scripts/kconfig/nconf: dynamically alloc dialog_input_result

To support unlimited length string config items;

No check for realloc return value keeps code simple, and to be
consistent with other existing unchecked malloc in kconfig.

Signed-off-by: Cheng Renquan <crquan@gmail.com>
Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>

1 files changed, 15 insertions, 5 deletions

diff --git a/scripts/kconfig/nconf.gui.c b/scripts/kconfig/nconf.gui.c
index 3ce2a7c0bda6..d64bc1c24c20 100644
--- a/scripts/kconfig/nconf.gui.c
+++ b/scripts/kconfig/nconf.gui.c
@@ -356,7 +356,7 @@ int btn_dialog(WINDOW *main_window, const char *msg, int btn_num, ...)
 
 int dialog_inputbox(WINDOW *main_window,
                 const char *title, const char *prompt,
-                const char *init, char *result, int result_len)
+                const char *init, char **resultp, int *result_len)
 {
         int prompt_lines = 0;
         int prompt_width = 0;
@@ -367,7 +367,12 @@ int dialog_inputbox(WINDOW *main_window,
         int i, x, y;
         int res = -1;
         int cursor_position = strlen(init);
+        char *result = *resultp;
 
+        if (strlen(init)+1 > *result_len) {
+                *result_len = strlen(init)+1;
+                *resultp = result = realloc(result, *result_len);
+        }
 
         /* find the widest line of msg: */
         prompt_lines = get_line_no(prompt);
@@ -384,7 +389,7 @@ int dialog_inputbox(WINDOW *main_window,
         y = (LINES-(prompt_lines+4))/2;
         x = (COLS-(prompt_width+4))/2;
 
-        strncpy(result, init, result_len);
+        strncpy(result, init, *result_len);
 
         /* create the windows */
         win = newwin(prompt_lines+6, prompt_width+7, y, x);
@@ -443,7 +448,7 @@ int dialog_inputbox(WINDOW *main_window,
                 case KEY_UP:
                 case KEY_RIGHT:
                         if (cursor_position < len &&
-                            cursor_position < min(result_len, prompt_width))
+                            cursor_position < min(*result_len, prompt_width))
                                 cursor_position++;
                         break;
                 case KEY_DOWN:
@@ -452,8 +457,13 @@ int dialog_inputbox(WINDOW *main_window,
                                 cursor_position--;
                         break;
                 default:
-                        if ((isgraph(res) || isspace(res)) &&
-                                        len-2 < result_len) {
+                        if ((isgraph(res) || isspace(res))) {
+                                /* one for new char, one for '\0' */
+                                if (len+2 > *result_len) {
+                                        *result_len = len+2;
+                                        *resultp = result = realloc(result,
+                                                                *result_len);
+                                }
                                 /* insert the char at the proper position */
                                 memmove(&result[cursor_position+1],
                                                 &result[cursor_position],