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 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