linux/scripts/kconfig/lxdialog/inputbox.c
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   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
  11char dialog_input_result[MAX_LEN + 1];
  12
  13/*
  14 *  Print the termination buttons
  15 */
  16static 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 */
  31int 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
  45do_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}
 290