kconfig/nconf: Fix hang when editing symbol with a long prompt

[pandora-kernel.git] / scripts / kconfig / nconf.gui.c

diff --git a/scripts/kconfig/nconf.gui.c b/scripts/kconfig/nconf.gui.c
index d64bc1c..52f9dd6 100644 (file)
--- a/scripts/kconfig/nconf.gui.c
+++ b/scripts/kconfig/nconf.gui.c
@@ -364,11 +364,14 @@ int dialog_inputbox(WINDOW *main_window,
        WINDOW *prompt_win;
        WINDOW *form_win;
        PANEL *panel;
-       int i, x, y;
+       int i, x, y, lines, columns, win_lines, win_cols;
        int res = -1;
        int cursor_position = strlen(init);
+       int cursor_form_win;
        char *result = *resultp;
 
+       getmaxyx(stdscr, lines, columns);
+
        if (strlen(init)+1 > *result_len) {
                *result_len = strlen(init)+1;
                *resultp = result = realloc(result, *result_len);
@@ -385,14 +388,19 @@ int dialog_inputbox(WINDOW *main_window,
        if (title)
                prompt_width = max(prompt_width, strlen(title));
 
+       win_lines = min(prompt_lines+6, lines-2);
+       win_cols = min(prompt_width+7, columns-2);
+       prompt_lines = max(win_lines-6, 0);
+       prompt_width = max(win_cols-7, 0);
+
        /* place dialog in middle of screen */
-       y = (LINES-(prompt_lines+4))/2;
-       x = (COLS-(prompt_width+4))/2;
+       y = (lines-win_lines)/2;
+       x = (columns-win_cols)/2;
 
        strncpy(result, init, *result_len);
 
        /* create the windows */
-       win = newwin(prompt_lines+6, prompt_width+7, y, x);
+       win = newwin(win_lines, win_cols, y, x);
        prompt_win = derwin(win, prompt_lines+1, prompt_width, 2, 2);
        form_win = derwin(win, 1, prompt_width, prompt_lines+3, 2);
        keypad(form_win, TRUE);
@@ -410,7 +418,9 @@ int dialog_inputbox(WINDOW *main_window,
        fill_window(prompt_win, prompt);
 
        mvwprintw(form_win, 0, 0, "%*s", prompt_width, " ");
-       mvwprintw(form_win, 0, 0, "%s", result);
+       cursor_form_win = min(cursor_position, prompt_width-1);
+       mvwprintw(form_win, 0, 0, "%s",
+                 result + cursor_position-cursor_form_win);
 
        /* create panels */
        panel = new_panel(win);
@@ -436,6 +446,8 @@ int dialog_inputbox(WINDOW *main_window,
                                                &result[cursor_position],
                                                len-cursor_position+1);
                                cursor_position--;
+                               cursor_form_win--;
+                               len--;
                        }
                        break;
                case KEY_DC:
@@ -443,18 +455,30 @@ int dialog_inputbox(WINDOW *main_window,
                                memmove(&result[cursor_position],
                                                &result[cursor_position+1],
                                                len-cursor_position+1);
+                               len--;
                        }
                        break;
                case KEY_UP:
                case KEY_RIGHT:
-                       if (cursor_position < len &&
-                           cursor_position < min(*result_len, prompt_width))
+                       if (cursor_position < len) {
                                cursor_position++;
+                               cursor_form_win++;
+                       }
                        break;
                case KEY_DOWN:
                case KEY_LEFT:
-                       if (cursor_position > 0)
+                       if (cursor_position > 0) {
                                cursor_position--;
+                               cursor_form_win--;
+                       }
+                       break;
+               case KEY_HOME:
+                       cursor_position = 0;
+                       cursor_form_win = 0;
+                       break;
+               case KEY_END:
+                       cursor_position = len;
+                       cursor_form_win = min(cursor_position, prompt_width-1);
                        break;
                default:
                        if ((isgraph(res) || isspace(res))) {
@@ -470,16 +494,24 @@ int dialog_inputbox(WINDOW *main_window,
                                                len-cursor_position+1);
                                result[cursor_position] = res;
                                cursor_position++;
+                               cursor_form_win++;
+                               len++;
                        } else {
                                mvprintw(0, 0, "unknown key: %d\n", res);
                        }
                        break;
                }
+               if (cursor_form_win < 0)
+                       cursor_form_win = 0;
+               else if (cursor_form_win > prompt_width-1)
+                       cursor_form_win = prompt_width-1;
+
                wmove(form_win, 0, 0);
                wclrtoeol(form_win);
                mvwprintw(form_win, 0, 0, "%*s", prompt_width, " ");
-               mvwprintw(form_win, 0, 0, "%s", result);
-               wmove(form_win, 0, cursor_position);
+               mvwprintw(form_win, 0, 0, "%s",
+                       result + cursor_position-cursor_form_win);
+               wmove(form_win, 0, cursor_form_win);
                touchwin(win);
                refresh_all_windows(main_window);