com32/elflink/ldlinux/cli.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <console.h>
   5 #include <com32.h>
   6 #include <syslinux/adv.h>
   7 #include <syslinux/config.h>
   8 #include <setjmp.h>
   9 #include <netinet/in.h>
  10 #include <limits.h>
  11 #include <minmax.h>
  12 #include <linux/list.h>
  13 #include <sys/exec.h>
  14 #include <sys/module.h>
  15 #include <dprintf.h>
  16 #include <core.h>
  17
  18 #include "getkey.h"
  19 #include "menu.h"
  20 #include "cli.h"
  21 #include "config.h"
  22
  23 static struct list_head cli_history_head;
  24
  25 void clear_screen(void)
  26 {
  27     //dprintf("enter");
  28     fputs("\033e\033%@\033)0\033(B\1#0\033[?25l\033[2J", stdout);
  29 }
  30
  31 static int mygetkey_timeout(clock_t *kbd_to, clock_t *tto)
  32 {
  33     clock_t t0, t1;
  34     int key;
  35
  36     t0 = times(NULL);
  37     key = get_key(stdin, *kbd_to ? *kbd_to : *tto);
  38
  39     /* kbdtimeout only applies to the first character */
  40     if (*kbd_to)
  41         *kbd_to = 0;
  42
  43     t1 = times(NULL) - t0;
  44     if (*tto) {
  45         /* Timed out. */
  46         if (*tto <= (long long)t1)
  47             key = KEY_NONE;
  48         else {
  49             /* Did it wrap? */
  50             if (*tto > totaltimeout)
  51                 key = KEY_NONE;
  52
  53             *tto -= t1;
  54         }
  55     }
  56
  57     return key;
  58 }
  59
  60 static const char * cmd_reverse_search(int *cursor, clock_t *kbd_to,
  61                                        clock_t *tto)
  62 {
  63     int key;
  64     int i = 0;
  65     char buf[MAX_CMDLINE_LEN];
  66     const char *p = NULL;
  67     struct cli_command *last_found;
  68     struct cli_command *last_good = NULL;
  69
  70     last_found = list_entry(cli_history_head.next, typeof(*last_found), list);
  71
  72     memset(buf, 0, MAX_CMDLINE_LEN);
  73
  74     printf("\033[1G\033[1;36m(reverse-i-search)`': \033[0m");
  75     while (1) {
  76         key = mygetkey_timeout(kbd_to, tto);
  77
  78         if (key == KEY_CTRL('C')) {
  79             return NULL;
  80         } else if (key == KEY_CTRL('R')) {
  81             if (i == 0)
  82                 continue; /* User typed nothing yet */
  83             /* User typed 'CTRL-R' again, so try the next */
  84             last_found = list_entry(last_found->list.next, typeof(*last_found), list);
  85         } else if (key >= ' ' && key <= 'z') {
  86                 buf[i++] = key;
  87         } else {
  88             /* Treat other input chars as terminal */
  89             break;
  90         }
  91
  92         while (last_found) {
  93             p = strstr(last_found->command, buf);
  94             if (p)
  95                 break;
  96
  97             if (list_is_last(&last_found->list, &cli_history_head))
  98                 break;
  99
 100             last_found = list_entry(last_found->list.next, typeof(*last_found), list);
 101         }
 102
 103         if (!p && !last_good) {
 104             return NULL;
 105         } else if (!p) {
 106             continue;
 107         } else {
 108             last_good = last_found;
 109             *cursor = p - last_good->command;
 110         }
 111
 112         printf("\033[?7l\033[?25l");
 113         /* Didn't handle the line wrap case here */
 114         printf("\033[1G\033[1;36m(reverse-i-search)\033[0m`%s': %s",
 115                 buf, last_good->command ? : "");
 116         printf("\033[K\r");
 117     }
 118
 119     return last_good ? last_good->command : NULL;
 120 }
 121
 122
 123
 124 const char *edit_cmdline(const char *input, int top /*, int width */ ,
 125                          int (*pDraw_Menu) (int, int, int),
 126                          void (*show_fkey) (int), bool *timedout)
 127 {
 128     static char cmdline[MAX_CMDLINE_LEN] = { };
 129     int key, len, prev_len, cursor;
 130     int redraw = 0;
 131     int x, y;
 132     bool done = false;
 133     const char *ret;
 134     int width = 0;
 135     struct cli_command *comm_counter = NULL;
 136     clock_t kbd_to = kbdtimeout;
 137     clock_t tto = totaltimeout;
 138
 139     if (!width) {
 140         int height;
 141         if (getscreensize(1, &height, &width))
 142             width = 80;
 143     }
 144
 145     len = cursor = 0;
 146     prev_len = 0;
 147     x = y = 0;
 148
 149     /*
 150      * Before we start messing with the x,y coordinates print 'input'
 151      * so that it follows whatever text has been written to the screen
 152      * previously.
 153      */
 154     printf("%s ", input);
 155
 156     while (!done) {
 157         if (redraw > 1) {
 158             /* Clear and redraw whole screen */
 159             /* Enable ASCII on G0 and DEC VT on G1; do it in this order
 160                to avoid confusing the Linux console */
 161             clear_screen();
 162             if (pDraw_Menu)
 163                     (*pDraw_Menu) (-1, top, 1);
 164             prev_len = 0;
 165             printf("\033[2J\033[H");
 166             // printf("\033[0m\033[2J\033[H");
 167         }
 168
 169         if (redraw > 0) {
 170             int dy, at;
 171
 172             prev_len = max(len, prev_len);
 173
 174             /* Redraw the command line */
 175             printf("\033[?25l");
 176             printf("\033[1G%s ", input);
 177
 178             x = strlen(input);
 179             y = 0;
 180             at = 0;
 181             while (at < prev_len) {
 182                 putchar(at >= len ? ' ' : cmdline[at]);
 183                 at++;
 184                 x++;
 185                 if (x >= width) {
 186                     printf("\r\n");
 187                     x = 0;
 188                     y++;
 189                 }
 190             }
 191             printf("\033[K\r");
 192
 193             dy = y - (cursor + strlen(input) + 1) / width;
 194             x = (cursor + strlen(input) + 1) % width;
 195
 196             if (dy) {
 197                 printf("\033[%dA", dy);
 198                 y -= dy;
 199             }
 200             if (x)
 201                 printf("\033[%dC", x);
 202             printf("\033[?25h");
 203             prev_len = len;
 204             redraw = 0;
 205         }
 206
 207         key = mygetkey_timeout(&kbd_to, &tto);
 208
 209         switch (key) {
 210         case KEY_NONE:
 211             /* We timed out. */
 212             *timedout = true;
 213             return NULL;
 214
 215         case KEY_CTRL('L'):
 216             redraw = 2;
 217             break;
 218
 219         case KEY_ENTER:
 220         case KEY_CTRL('J'):
 221             ret = cmdline;
 222             done = true;
 223             break;
 224
 225         case KEY_BACKSPACE:
 226         case KEY_DEL:
 227             if (cursor) {
 228                 memmove(cmdline + cursor - 1, cmdline + cursor,
 229                         len - cursor + 1);
 230                 len--;
 231                 cursor--;
 232                 redraw = 1;
 233             }
 234             break;
 235
 236         case KEY_CTRL('D'):
 237         case KEY_DELETE:
 238             if (cursor < len) {
 239                 memmove(cmdline + cursor, cmdline + cursor + 1, len - cursor);
 240                 len--;
 241                 redraw = 1;
 242             }
 243             break;
 244
 245         case KEY_CTRL('U'):
 246             if (len) {
 247                 len = cursor = 0;
 248                 cmdline[len] = '\0';
 249                 redraw = 1;
 250             }
 251             break;
 252
 253         case KEY_CTRL('W'):
 254             if (cursor) {
 255                 int prevcursor = cursor;
 256
 257                 while (cursor && my_isspace(cmdline[cursor - 1]))
 258                     cursor--;
 259
 260                 while (cursor && !my_isspace(cmdline[cursor - 1]))
 261                     cursor--;
 262
 263 #if 0
 264                 memmove(cmdline + cursor, cmdline + prevcursor,
 265                         len - prevcursor + 1);
 266 #else
 267                 {
 268                     int i;
 269                     char *q = cmdline + cursor;
 270                     char *p = cmdline + prevcursor;
 271                     for (i = 0; i < len - prevcursor + 1; i++)
 272                         *q++ = *p++;
 273                 }
 274 #endif
 275                 len -= (prevcursor - cursor);
 276                 redraw = 1;
 277             }
 278             break;
 279
 280         case KEY_LEFT:
 281         case KEY_CTRL('B'):
 282             if (cursor) {
 283                 cursor--;
 284                 redraw = 1;
 285             }
 286             break;
 287
 288         case KEY_RIGHT:
 289         case KEY_CTRL('F'):
 290             if (cursor < len) {
 291                 putchar(cmdline[cursor]);
 292                 cursor++;
 293                 x++;
 294                 if (x >= width) {
 295                     printf("\r\n");
 296                     y++;
 297                     x = 0;
 298                 }
 299             }
 300             break;
 301
 302         case KEY_CTRL('K'):
 303             if (cursor < len) {
 304                 cmdline[len = cursor] = '\0';
 305                 redraw = 1;
 306             }
 307             break;
 308
 309         case KEY_HOME:
 310         case KEY_CTRL('A'):
 311             if (cursor) {
 312                 cursor = 0;
 313                 redraw = 1;
 314             }
 315             break;
 316
 317         case KEY_END:
 318         case KEY_CTRL('E'):
 319             if (cursor != len) {
 320                 cursor = len;
 321                 redraw = 1;
 322             }
 323             break;
 324
 325         case KEY_F1:
 326         case KEY_F2:
 327         case KEY_F3:
 328         case KEY_F4:
 329         case KEY_F5:
 330         case KEY_F6:
 331         case KEY_F7:
 332         case KEY_F8:
 333         case KEY_F9:
 334         case KEY_F10:
 335         case KEY_F11:
 336         case KEY_F12:
 337             if (show_fkey != NULL) {
 338                 (*show_fkey) (key);
 339                 redraw = 1;
 340             }
 341             break;
 342         case KEY_CTRL('P'):
 343         case KEY_UP:
 344             {
 345                 if (!list_empty(&cli_history_head)) {
 346                     struct list_head *next;
 347
 348                     if (!comm_counter)
 349                         next = cli_history_head.next;
 350                     else
 351                         next = comm_counter->list.next;
 352
 353                     comm_counter =
 354                         list_entry(next, typeof(*comm_counter), list);
 355
 356                     if (&comm_counter->list != &cli_history_head)
 357                         strcpy(cmdline, comm_counter->command);
 358
 359                     cursor = len = strlen(cmdline);
 360                     redraw = 1;
 361                 }
 362             }
 363             break;
 364         case KEY_CTRL('N'):
 365         case KEY_DOWN:
 366             {
 367                 if (!list_empty(&cli_history_head)) {
 368                     struct list_head *prev;
 369
 370                     if (!comm_counter)
 371                         prev = cli_history_head.prev;
 372                     else
 373                         prev = comm_counter->list.prev;
 374
 375                     comm_counter =
 376                         list_entry(prev, typeof(*comm_counter), list);
 377
 378                     if (&comm_counter->list != &cli_history_head)
 379                         strcpy(cmdline, comm_counter->command);
 380
 381                     cursor = len = strlen(cmdline);
 382                     redraw = 1;
 383                 }
 384             }
 385             break;
 386         case KEY_CTRL('R'):
 387             {
 388                  /*
 389                   * Handle this case in another function, since it's
 390                   * a kind of special.
 391                   */
 392                 const char *p = cmd_reverse_search(&cursor, &kbd_to, &tto);
 393                 if (p) {
 394                     strcpy(cmdline, p);
 395                     len = strlen(cmdline);
 396                 } else {
 397                     cmdline[0] = '\0';
 398                     cursor = len = 0;
 399                 }
 400                 redraw = 1;
 401             }
 402             break;
 403         case KEY_TAB:
 404             {
 405                 const char *p;
 406                 size_t len;
 407
 408                 /* Label completion enabled? */
 409                 if (nocomplete)
 410                     break;
 411
 412                 p = cmdline;
 413                 len = 0;
 414                 while(*p && !my_isspace(*p)) {
 415                     p++;
 416                     len++;
 417                 }
 418
 419                 print_labels(cmdline, len);
 420                 redraw = 1;
 421                 break;
 422             }
 423         case KEY_CTRL('V'):
 424             if (BIOSName)
 425                 printf("%s%s%s", syslinux_banner,
 426                        (char *)MK_PTR(0, BIOSName), copyright_str);
 427             else
 428                 printf("%s%s", syslinux_banner, copyright_str);
 429
 430             redraw = 1;
 431             break;
 432
 433         default:
 434             if (key >= ' ' && key <= 0xFF && len < MAX_CMDLINE_LEN - 1) {
 435                 if (cursor == len) {
 436                     cmdline[len++] = key;
 437                     cmdline[len] = '\0';
 438                     putchar(key);
 439                     cursor++;
 440                     x++;
 441                     if (x >= width) {
 442                         printf("\r\n\033[K");
 443                         y++;
 444                         x = 0;
 445                     }
 446                     prev_len++;
 447                 } else {
 448                     if (cursor > len)
 449                         return NULL;
 450
 451                     memmove(cmdline + cursor + 1, cmdline + cursor,
 452                             len - cursor + 1);
 453                     cmdline[cursor++] = key;
 454                     len++;
 455                     redraw = 1;
 456                 }
 457             }
 458             break;
 459         }
 460     }
 461
 462     printf("\033[?7h");
 463
 464     /* Add the command to the history if its length is larger than 0 */
 465     len = strlen(ret);
 466     if (len > 0) {
 467         comm_counter = malloc(sizeof(struct cli_command));
 468         comm_counter->command = malloc(sizeof(char) * (len + 1));
 469         strcpy(comm_counter->command, ret);
 470         list_add(&(comm_counter->list), &cli_history_head);
 471     }
 472
 473     return len ? ret : NULL;
 474 }
 475
 476 static int __constructor cli_init(void)
 477 {
 478         INIT_LIST_HEAD(&cli_history_head);
 479
 480         return 0;
 481 }
 482
 483 static void __destructor cli_exit(void)
 484 {
 485         /* Nothing to do */
 486 }