util/kconfig/lxdialog/inputbox.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  inputbox.c -- implements the input box
   4  *
   5  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
   6  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
   7  */
   8
   9 #include "dialog.h"
  10
  11 char dialog_input_result[MAX_LEN + 1];
  12
  13 /*
  14  *  Print the termination buttons
  15  */
  16 static void print_buttons(WINDOW * dialog, int height, int width, int selected)
  17 {
  18         int x = width / 2 - 11;
  19         int y = height - 2;
  20
  21         print_button(dialog, "  Ok  ", y, x, selected == 0);
  22         print_button(dialog, " Help ", y, x + 14, selected == 1);
  23
  24         wmove(dialog, y, x + 1 + 14 * selected);
  25         wrefresh(dialog);
  26 }
  27
  28 /*
  29  * Display a dialog box for inputing a string
  30  */
  31 int dialog_inputbox(const char *title, const char *prompt, int height, int width,
  32                     const char *init)
  33 {
  34         int i, x, y, box_y, box_x, box_width;
  35         int input_x = 0, key = 0, button = -1;
  36         int show_x, len, pos;
  37         char *instr = dialog_input_result;
  38         WINDOW *dialog;
  39
  40         if (!init)
  41                 instr[0] = '\0';
  42         else
  43                 strcpy(instr, init);
  44
  45 do_resize:
  46         if (getmaxy(stdscr) <= (height - INPUTBOX_HEIGTH_MIN))
  47                 return -ERRDISPLAYTOOSMALL;
  48         if (getmaxx(stdscr) <= (width - INPUTBOX_WIDTH_MIN))
  49                 return -ERRDISPLAYTOOSMALL;
  50
  51         /* center dialog box on screen */
  52         x = (getmaxx(stdscr) - width) / 2;
  53         y = (getmaxy(stdscr) - height) / 2;
  54
  55         draw_shadow(stdscr, y, x, height, width);
  56
  57         dialog = newwin(height, width, y, x);
  58         keypad(dialog, TRUE);
  59
  60         draw_box(dialog, 0, 0, height, width,
  61                  dlg.dialog.atr, dlg.border.atr);
  62         wattrset(dialog, dlg.border.atr);
  63         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
  64         for (i = 0; i < width - 2; i++)
  65                 waddch(dialog, ACS_HLINE);
  66         wattrset(dialog, dlg.dialog.atr);
  67         waddch(dialog, ACS_RTEE);
  68
  69         print_title(dialog, title, width);
  70
  71         wattrset(dialog, dlg.dialog.atr);
  72         print_autowrap(dialog, prompt, width - 2, 1, 3);
  73
  74         /* Draw the input field box */
  75         box_width = width - 6;
  76         getyx(dialog, y, x);
  77         box_y = y + 2;
  78         box_x = (width - box_width) / 2;
  79         draw_box(dialog, y + 1, box_x - 1, 3, box_width + 2,
  80                  dlg.dialog.atr, dlg.border.atr);
  81
  82         print_buttons(dialog, height, width, 0);
  83
  84         /* Set up the initial value */
  85         wmove(dialog, box_y, box_x);
  86         wattrset(dialog, dlg.inputbox.atr);
  87
  88         len = strlen(instr);
  89         pos = len;
  90
  91         if (len >= box_width) {
  92                 show_x = len - box_width + 1;
  93                 input_x = box_width - 1;
  94                 for (i = 0; i < box_width - 1; i++)
  95                         waddch(dialog, instr[show_x + i]);
  96         } else {
  97                 show_x = 0;
  98                 input_x = len;
  99                 waddstr(dialog, instr);
 100         }
 101
 102         wmove(dialog, box_y, box_x + input_x);
 103
 104         wrefresh(dialog);
 105
 106         while (key != KEY_ESC) {
 107                 key = wgetch(dialog);
 108
 109                 if (button == -1) {     /* Input box selected */
 110                         switch (key) {
 111                         case TAB:
 112                         case KEY_UP:
 113                         case KEY_DOWN:
 114                                 break;
 115                         case KEY_BACKSPACE:
 116                         case 8:   /* ^H */
 117                         case 127: /* ^? */
 118                                 if (pos) {
 119                                         wattrset(dialog, dlg.inputbox.atr);
 120                                         if (input_x == 0) {
 121                                                 show_x--;
 122                                         } else
 123                                                 input_x--;
 124
 125                                         if (pos < len) {
 126                                                 for (i = pos - 1; i < len; i++) {
 127                                                         instr[i] = instr[i+1];
 128                                                 }
 129                                         }
 130
 131                                         pos--;
 132                                         len--;
 133                                         instr[len] = '\0';
 134                                         wmove(dialog, box_y, box_x);
 135                                         for (i = 0; i < box_width; i++) {
 136                                                 if (!instr[show_x + i]) {
 137                                                         waddch(dialog, ' ');
 138                                                         break;
 139                                                 }
 140                                                 waddch(dialog, instr[show_x + i]);
 141                                         }
 142                                         wmove(dialog, box_y, input_x + box_x);
 143                                         wrefresh(dialog);
 144                                 }
 145                                 continue;
 146                         case KEY_LEFT:
 147                                 if (pos > 0) {
 148                                         if (input_x > 0) {
 149                                                 wmove(dialog, box_y, --input_x + box_x);
 150                                         } else if (input_x == 0) {
 151                                                 show_x--;
 152                                                 wmove(dialog, box_y, box_x);
 153                                                 for (i = 0; i < box_width; i++) {
 154                                                         if (!instr[show_x + i]) {
 155                                                                 waddch(dialog, ' ');
 156                                                                 break;
 157                                                         }
 158                                                         waddch(dialog, instr[show_x + i]);
 159                                                 }
 160                                                 wmove(dialog, box_y, box_x);
 161                                         }
 162                                         pos--;
 163                                 }
 164                                 continue;
 165                         case KEY_RIGHT:
 166                                 if (pos < len) {
 167                                         if (input_x < box_width - 1) {
 168                                                 wmove(dialog, box_y, ++input_x + box_x);
 169                                         } else if (input_x == box_width - 1) {
 170                                                 show_x++;
 171                                                 wmove(dialog, box_y, box_x);
 172                                                 for (i = 0; i < box_width; i++) {
 173                                                         if (!instr[show_x + i]) {
 174                                                                 waddch(dialog, ' ');
 175                                                                 break;
 176                                                         }
 177                                                         waddch(dialog, instr[show_x + i]);
 178                                                 }
 179                                                 wmove(dialog, box_y, input_x + box_x);
 180                                         }
 181                                         pos++;
 182                                 }
 183                                 continue;
 184                         default:
 185                                 if (key < 0x100 && isprint(key)) {
 186                                         if (len < MAX_LEN) {
 187                                                 wattrset(dialog, dlg.inputbox.atr);
 188                                                 if (pos < len) {
 189                                                         for (i = len; i > pos; i--)
 190                                                                 instr[i] = instr[i-1];
 191                                                         instr[pos] = key;
 192                                                 } else {
 193                                                         instr[len] = key;
 194                                                 }
 195                                                 pos++;
 196                                                 len++;
 197                                                 instr[len] = '\0';
 198
 199                                                 if (input_x == box_width - 1) {
 200                                                         show_x++;
 201                                                 } else {
 202                                                         input_x++;
 203                                                 }
 204
 205                                                 wmove(dialog, box_y, box_x);
 206                                                 for (i = 0; i < box_width; i++) {
 207                                                         if (!instr[show_x + i]) {
 208                                                                 waddch(dialog, ' ');
 209                                                                 break;
 210                                                         }
 211                                                         waddch(dialog, instr[show_x + i]);
 212                                                 }
 213                                                 wmove(dialog, box_y, input_x + box_x);
 214                                                 wrefresh(dialog);
 215                                         } else
 216                                                 flash();        /* Alarm user about overflow */
 217                                         continue;
 218                                 }
 219                         }
 220                 }
 221                 switch (key) {
 222                 case 'O':
 223                 case 'o':
 224                         delwin(dialog);
 225                         return 0;
 226                 case 'H':
 227                 case 'h':
 228                         delwin(dialog);
 229                         return 1;
 230                 case KEY_UP:
 231                 case KEY_LEFT:
 232                         switch (button) {
 233                         case -1:
 234                                 button = 1;     /* Indicates "Help" button is selected */
 235                                 print_buttons(dialog, height, width, 1);
 236                                 break;
 237                         case 0:
 238                                 button = -1;    /* Indicates input box is selected */
 239                                 print_buttons(dialog, height, width, 0);
 240                                 wmove(dialog, box_y, box_x + input_x);
 241                                 wrefresh(dialog);
 242                                 break;
 243                         case 1:
 244                                 button = 0;     /* Indicates "OK" button is selected */
 245                                 print_buttons(dialog, height, width, 0);
 246                                 break;
 247                         }
 248                         break;
 249                 case TAB:
 250                 case KEY_DOWN:
 251                 case KEY_RIGHT:
 252                         switch (button) {
 253                         case -1:
 254                                 button = 0;     /* Indicates "OK" button is selected */
 255                                 print_buttons(dialog, height, width, 0);
 256                                 break;
 257                         case 0:
 258                                 button = 1;     /* Indicates "Help" button is selected */
 259                                 print_buttons(dialog, height, width, 1);
 260                                 break;
 261                         case 1:
 262                                 button = -1;    /* Indicates input box is selected */
 263                                 print_buttons(dialog, height, width, 0);
 264                                 wmove(dialog, box_y, box_x + input_x);
 265                                 wrefresh(dialog);
 266                                 break;
 267                         }
 268                         break;
 269                 case ' ':
 270                 case '\n':
 271                         delwin(dialog);
 272                         return (button == -1 ? 0 : button);
 273                 case 'X':
 274                 case 'x':
 275                         key = KEY_ESC;
 276                         break;
 277                 case KEY_ESC:
 278                         key = on_key_esc(dialog);
 279                         break;
 280                 case KEY_RESIZE:
 281                         delwin(dialog);
 282                         on_key_resize();
 283                         goto do_resize;
 284                 }
 285         }
 286
 287         delwin(dialog);
 288         return KEY_ESC;         /* ESC pressed */
 289 }