scripts/kconfig/lxdialog/inputbox.c

   1 // SPDX-License-Identifier: GPL-2.0+
   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 127:
 117                                 if (pos) {
 118                                         wattrset(dialog, dlg.inputbox.atr);
 119                                         if (input_x == 0) {
 120                                                 show_x--;
 121                                         } else
 122                                                 input_x--;
 123
 124                                         if (pos < len) {
 125                                                 for (i = pos - 1; i < len; i++) {
 126                                                         instr[i] = instr[i+1];
 127                                                 }
 128                                         }
 129
 130                                         pos--;
 131                                         len--;
 132                                         instr[len] = '\0';
 133                                         wmove(dialog, box_y, box_x);
 134                                         for (i = 0; i < box_width; i++) {
 135                                                 if (!instr[show_x + i]) {
 136                                                         waddch(dialog, ' ');
 137                                                         break;
 138                                                 }
 139                                                 waddch(dialog, instr[show_x + i]);
 140                                         }
 141                                         wmove(dialog, box_y, input_x + box_x);
 142                                         wrefresh(dialog);
 143                                 }
 144                                 continue;
 145                         case KEY_LEFT:
 146                                 if (pos > 0) {
 147                                         if (input_x > 0) {
 148                                                 wmove(dialog, box_y, --input_x + box_x);
 149                                         } else if (input_x == 0) {
 150                                                 show_x--;
 151                                                 wmove(dialog, box_y, box_x);
 152                                                 for (i = 0; i < box_width; i++) {
 153                                                         if (!instr[show_x + i]) {
 154                                                                 waddch(dialog, ' ');
 155                                                                 break;
 156                                                         }
 157                                                         waddch(dialog, instr[show_x + i]);
 158                                                 }
 159                                                 wmove(dialog, box_y, box_x);
 160                                         }
 161                                         pos--;
 162                                 }
 163                                 continue;
 164                         case KEY_RIGHT:
 165                                 if (pos < len) {
 166                                         if (input_x < box_width - 1) {
 167                                                 wmove(dialog, box_y, ++input_x + box_x);
 168                                         } else if (input_x == box_width - 1) {
 169                                                 show_x++;
 170                                                 wmove(dialog, box_y, box_x);
 171                                                 for (i = 0; i < box_width; i++) {
 172                                                         if (!instr[show_x + i]) {
 173                                                                 waddch(dialog, ' ');
 174                                                                 break;
 175                                                         }
 176                                                         waddch(dialog, instr[show_x + i]);
 177                                                 }
 178                                                 wmove(dialog, box_y, input_x + box_x);
 179                                         }
 180                                         pos++;
 181                                 }
 182                                 continue;
 183                         default:
 184                                 if (key < 0x100 && isprint(key)) {
 185                                         if (len < MAX_LEN) {
 186                                                 wattrset(dialog, dlg.inputbox.atr);
 187                                                 if (pos < len) {
 188                                                         for (i = len; i > pos; i--)
 189                                                                 instr[i] = instr[i-1];
 190                                                         instr[pos] = key;
 191                                                 } else {
 192                                                         instr[len] = key;
 193                                                 }
 194                                                 pos++;
 195                                                 len++;
 196                                                 instr[len] = '\0';
 197
 198                                                 if (input_x == box_width - 1) {
 199                                                         show_x++;
 200                                                 } else {
 201                                                         input_x++;
 202                                                 }
 203
 204                                                 wmove(dialog, box_y, box_x);
 205                                                 for (i = 0; i < box_width; i++) {
 206                                                         if (!instr[show_x + i]) {
 207                                                                 waddch(dialog, ' ');
 208                                                                 break;
 209                                                         }
 210                                                         waddch(dialog, instr[show_x + i]);
 211                                                 }
 212                                                 wmove(dialog, box_y, input_x + box_x);
 213                                                 wrefresh(dialog);
 214                                         } else
 215                                                 flash();        /* Alarm user about overflow */
 216                                         continue;
 217                                 }
 218                         }
 219                 }
 220                 switch (key) {
 221                 case 'O':
 222                 case 'o':
 223                         delwin(dialog);
 224                         return 0;
 225                 case 'H':
 226                 case 'h':
 227                         delwin(dialog);
 228                         return 1;
 229                 case KEY_UP:
 230                 case KEY_LEFT:
 231                         switch (button) {
 232                         case -1:
 233                                 button = 1;     /* Indicates "Help" button is selected */
 234                                 print_buttons(dialog, height, width, 1);
 235                                 break;
 236                         case 0:
 237                                 button = -1;    /* Indicates input box is selected */
 238                                 print_buttons(dialog, height, width, 0);
 239                                 wmove(dialog, box_y, box_x + input_x);
 240                                 wrefresh(dialog);
 241                                 break;
 242                         case 1:
 243                                 button = 0;     /* Indicates "OK" button is selected */
 244                                 print_buttons(dialog, height, width, 0);
 245                                 break;
 246                         }
 247                         break;
 248                 case TAB:
 249                 case KEY_DOWN:
 250                 case KEY_RIGHT:
 251                         switch (button) {
 252                         case -1:
 253                                 button = 0;     /* Indicates "OK" button is selected */
 254                                 print_buttons(dialog, height, width, 0);
 255                                 break;
 256                         case 0:
 257                                 button = 1;     /* Indicates "Help" button is selected */
 258                                 print_buttons(dialog, height, width, 1);
 259                                 break;
 260                         case 1:
 261                                 button = -1;    /* Indicates input box is selected */
 262                                 print_buttons(dialog, height, width, 0);
 263                                 wmove(dialog, box_y, box_x + input_x);
 264                                 wrefresh(dialog);
 265                                 break;
 266                         }
 267                         break;
 268                 case ' ':
 269                 case '\n':
 270                         delwin(dialog);
 271                         return (button == -1 ? 0 : button);
 272                 case 'X':
 273                 case 'x':
 274                         key = KEY_ESC;
 275                         break;
 276                 case KEY_ESC:
 277                         key = on_key_esc(dialog);
 278                         break;
 279                 case KEY_RESIZE:
 280                         delwin(dialog);
 281                         on_key_resize();
 282                         goto do_resize;
 283                 }
 284         }
 285
 286         delwin(dialog);
 287         return KEY_ESC;         /* ESC pressed */
 288 }