common/cli_readline.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  *
   6  * Add to readline cmdline-editing by
   7  * (C) Copyright 2005
   8  * JinHua Luo, GuangDong Linux Center, <luo.jinhua@gd-linux.com>
   9  */
  10
  11 #include <common.h>
  12 #include <bootretry.h>
  13 #include <cli.h>
  14 #include <time.h>
  15 #include <watchdog.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 static const char erase_seq[] = "\b \b";        /* erase sequence */
  20 static const char   tab_seq[] = "        ";     /* used to expand TABs */
  21
  22 char console_buffer[CONFIG_SYS_CBSIZE + 1];     /* console I/O buffer   */
  23
  24 static char *delete_char (char *buffer, char *p, int *colp, int *np, int plen)
  25 {
  26         char *s;
  27
  28         if (*np == 0)
  29                 return p;
  30
  31         if (*(--p) == '\t') {           /* will retype the whole line */
  32                 while (*colp > plen) {
  33                         puts(erase_seq);
  34                         (*colp)--;
  35                 }
  36                 for (s = buffer; s < p; ++s) {
  37                         if (*s == '\t') {
  38                                 puts(tab_seq + ((*colp) & 07));
  39                                 *colp += 8 - ((*colp) & 07);
  40                         } else {
  41                                 ++(*colp);
  42                                 putc(*s);
  43                         }
  44                 }
  45         } else {
  46                 puts(erase_seq);
  47                 (*colp)--;
  48         }
  49         (*np)--;
  50
  51         return p;
  52 }
  53
  54 #ifdef CONFIG_CMDLINE_EDITING
  55
  56 /*
  57  * cmdline-editing related codes from vivi.
  58  * Author: Janghoon Lyu <nandy@mizi.com>
  59  */
  60
  61 #define putnstr(str, n) printf("%.*s", (int)n, str)
  62
  63 #define CTL_CH(c)               ((c) - 'a' + 1)
  64 #define CTL_BACKSPACE           ('\b')
  65 #define DEL                     ((char)255)
  66 #define DEL7                    ((char)127)
  67 #define CREAD_HIST_CHAR         ('!')
  68
  69 #define getcmd_putch(ch)        putc(ch)
  70 #define getcmd_getch()          getc()
  71 #define getcmd_cbeep()          getcmd_putch('\a')
  72
  73 #define HIST_MAX                20
  74 #define HIST_SIZE               CONFIG_SYS_CBSIZE
  75
  76 static int hist_max;
  77 static int hist_add_idx;
  78 static int hist_cur = -1;
  79 static unsigned hist_num;
  80
  81 static char *hist_list[HIST_MAX];
  82 static char hist_lines[HIST_MAX][HIST_SIZE + 1];        /* Save room for NULL */
  83
  84 #define add_idx_minus_one() ((hist_add_idx == 0) ? hist_max : hist_add_idx-1)
  85
  86 static void hist_init(void)
  87 {
  88         int i;
  89
  90         hist_max = 0;
  91         hist_add_idx = 0;
  92         hist_cur = -1;
  93         hist_num = 0;
  94
  95         for (i = 0; i < HIST_MAX; i++) {
  96                 hist_list[i] = hist_lines[i];
  97                 hist_list[i][0] = '\0';
  98         }
  99 }
 100
 101 static void cread_add_to_hist(char *line)
 102 {
 103         strcpy(hist_list[hist_add_idx], line);
 104
 105         if (++hist_add_idx >= HIST_MAX)
 106                 hist_add_idx = 0;
 107
 108         if (hist_add_idx > hist_max)
 109                 hist_max = hist_add_idx;
 110
 111         hist_num++;
 112 }
 113
 114 static char *hist_prev(void)
 115 {
 116         char *ret;
 117         int old_cur;
 118
 119         if (hist_cur < 0)
 120                 return NULL;
 121
 122         old_cur = hist_cur;
 123         if (--hist_cur < 0)
 124                 hist_cur = hist_max;
 125
 126         if (hist_cur == hist_add_idx) {
 127                 hist_cur = old_cur;
 128                 ret = NULL;
 129         } else {
 130                 ret = hist_list[hist_cur];
 131         }
 132
 133         return ret;
 134 }
 135
 136 static char *hist_next(void)
 137 {
 138         char *ret;
 139
 140         if (hist_cur < 0)
 141                 return NULL;
 142
 143         if (hist_cur == hist_add_idx)
 144                 return NULL;
 145
 146         if (++hist_cur > hist_max)
 147                 hist_cur = 0;
 148
 149         if (hist_cur == hist_add_idx)
 150                 ret = "";
 151         else
 152                 ret = hist_list[hist_cur];
 153
 154         return ret;
 155 }
 156
 157 #ifndef CONFIG_CMDLINE_EDITING
 158 static void cread_print_hist_list(void)
 159 {
 160         int i;
 161         unsigned long n;
 162
 163         n = hist_num - hist_max;
 164
 165         i = hist_add_idx + 1;
 166         while (1) {
 167                 if (i > hist_max)
 168                         i = 0;
 169                 if (i == hist_add_idx)
 170                         break;
 171                 printf("%s\n", hist_list[i]);
 172                 n++;
 173                 i++;
 174         }
 175 }
 176 #endif /* CONFIG_CMDLINE_EDITING */
 177
 178 #define BEGINNING_OF_LINE() {                   \
 179         while (num) {                           \
 180                 getcmd_putch(CTL_BACKSPACE);    \
 181                 num--;                          \
 182         }                                       \
 183 }
 184
 185 #define ERASE_TO_EOL() {                                \
 186         if (num < eol_num) {                            \
 187                 printf("%*s", (int)(eol_num - num), ""); \
 188                 do {                                    \
 189                         getcmd_putch(CTL_BACKSPACE);    \
 190                 } while (--eol_num > num);              \
 191         }                                               \
 192 }
 193
 194 #define REFRESH_TO_EOL() {                      \
 195         if (num < eol_num) {                    \
 196                 wlen = eol_num - num;           \
 197                 putnstr(buf + num, wlen);       \
 198                 num = eol_num;                  \
 199         }                                       \
 200 }
 201
 202 static void cread_add_char(char ichar, int insert, unsigned long *num,
 203                unsigned long *eol_num, char *buf, unsigned long len)
 204 {
 205         unsigned long wlen;
 206
 207         /* room ??? */
 208         if (insert || *num == *eol_num) {
 209                 if (*eol_num > len - 1) {
 210                         getcmd_cbeep();
 211                         return;
 212                 }
 213                 (*eol_num)++;
 214         }
 215
 216         if (insert) {
 217                 wlen = *eol_num - *num;
 218                 if (wlen > 1)
 219                         memmove(&buf[*num+1], &buf[*num], wlen-1);
 220
 221                 buf[*num] = ichar;
 222                 putnstr(buf + *num, wlen);
 223                 (*num)++;
 224                 while (--wlen)
 225                         getcmd_putch(CTL_BACKSPACE);
 226         } else {
 227                 /* echo the character */
 228                 wlen = 1;
 229                 buf[*num] = ichar;
 230                 putnstr(buf + *num, wlen);
 231                 (*num)++;
 232         }
 233 }
 234
 235 static void cread_add_str(char *str, int strsize, int insert,
 236                           unsigned long *num, unsigned long *eol_num,
 237                           char *buf, unsigned long len)
 238 {
 239         while (strsize--) {
 240                 cread_add_char(*str, insert, num, eol_num, buf, len);
 241                 str++;
 242         }
 243 }
 244
 245 static int cread_line(const char *const prompt, char *buf, unsigned int *len,
 246                 int timeout)
 247 {
 248         unsigned long num = 0;
 249         unsigned long eol_num = 0;
 250         unsigned long wlen;
 251         char ichar;
 252         int insert = 1;
 253         int esc_len = 0;
 254         char esc_save[8];
 255         int init_len = strlen(buf);
 256         int first = 1;
 257
 258         if (init_len)
 259                 cread_add_str(buf, init_len, 1, &num, &eol_num, buf, *len);
 260
 261         while (1) {
 262                 if (bootretry_tstc_timeout())
 263                         return -2;      /* timed out */
 264                 if (first && timeout) {
 265                         uint64_t etime = endtick(timeout);
 266
 267                         while (!tstc()) {       /* while no incoming data */
 268                                 if (get_ticks() >= etime)
 269                                         return -2;      /* timed out */
 270                                 WATCHDOG_RESET();
 271                         }
 272                         first = 0;
 273                 }
 274
 275                 ichar = getcmd_getch();
 276
 277                 /* ichar=0x0 when error occurs in U-Boot getc */
 278                 if (!ichar)
 279                         continue;
 280
 281                 if ((ichar == '\n') || (ichar == '\r')) {
 282                         putc('\n');
 283                         break;
 284                 }
 285
 286                 /*
 287                  * handle standard linux xterm esc sequences for arrow key, etc.
 288                  */
 289                 if (esc_len != 0) {
 290                         enum { ESC_REJECT, ESC_SAVE, ESC_CONVERTED } act = ESC_REJECT;
 291
 292                         if (esc_len == 1) {
 293                                 if (ichar == '[' || ichar == 'O')
 294                                         act = ESC_SAVE;
 295                         } else if (esc_len == 2) {
 296                                 switch (ichar) {
 297                                 case 'D':       /* <- key */
 298                                         ichar = CTL_CH('b');
 299                                         act = ESC_CONVERTED;
 300                                         break;  /* pass off to ^B handler */
 301                                 case 'C':       /* -> key */
 302                                         ichar = CTL_CH('f');
 303                                         act = ESC_CONVERTED;
 304                                         break;  /* pass off to ^F handler */
 305                                 case 'H':       /* Home key */
 306                                         ichar = CTL_CH('a');
 307                                         act = ESC_CONVERTED;
 308                                         break;  /* pass off to ^A handler */
 309                                 case 'F':       /* End key */
 310                                         ichar = CTL_CH('e');
 311                                         act = ESC_CONVERTED;
 312                                         break;  /* pass off to ^E handler */
 313                                 case 'A':       /* up arrow */
 314                                         ichar = CTL_CH('p');
 315                                         act = ESC_CONVERTED;
 316                                         break;  /* pass off to ^P handler */
 317                                 case 'B':       /* down arrow */
 318                                         ichar = CTL_CH('n');
 319                                         act = ESC_CONVERTED;
 320                                         break;  /* pass off to ^N handler */
 321                                 case '1':
 322                                 case '3':
 323                                 case '4':
 324                                 case '7':
 325                                 case '8':
 326                                         if (esc_save[1] == '[') {
 327                                                 /* see if next character is ~ */
 328                                                 act = ESC_SAVE;
 329                                         }
 330                                         break;
 331                                 }
 332                         } else if (esc_len == 3) {
 333                                 if (ichar == '~') {
 334                                         switch (esc_save[2]) {
 335                                         case '3':       /* Delete key */
 336                                                 ichar = CTL_CH('d');
 337                                                 act = ESC_CONVERTED;
 338                                                 break;  /* pass to ^D handler */
 339                                         case '1':       /* Home key */
 340                                         case '7':
 341                                                 ichar = CTL_CH('a');
 342                                                 act = ESC_CONVERTED;
 343                                                 break;  /* pass to ^A handler */
 344                                         case '4':       /* End key */
 345                                         case '8':
 346                                                 ichar = CTL_CH('e');
 347                                                 act = ESC_CONVERTED;
 348                                                 break;  /* pass to ^E handler */
 349                                         }
 350                                 }
 351                         }
 352
 353                         switch (act) {
 354                         case ESC_SAVE:
 355                                 esc_save[esc_len++] = ichar;
 356                                 continue;
 357                         case ESC_REJECT:
 358                                 esc_save[esc_len++] = ichar;
 359                                 cread_add_str(esc_save, esc_len, insert,
 360                                               &num, &eol_num, buf, *len);
 361                                 esc_len = 0;
 362                                 continue;
 363                         case ESC_CONVERTED:
 364                                 esc_len = 0;
 365                                 break;
 366                         }
 367                 }
 368
 369                 switch (ichar) {
 370                 case 0x1b:
 371                         if (esc_len == 0) {
 372                                 esc_save[esc_len] = ichar;
 373                                 esc_len = 1;
 374                         } else {
 375                                 puts("impossible condition #876\n");
 376                                 esc_len = 0;
 377                         }
 378                         break;
 379
 380                 case CTL_CH('a'):
 381                         BEGINNING_OF_LINE();
 382                         break;
 383                 case CTL_CH('c'):       /* ^C - break */
 384                         *buf = '\0';    /* discard input */
 385                         return -1;
 386                 case CTL_CH('f'):
 387                         if (num < eol_num) {
 388                                 getcmd_putch(buf[num]);
 389                                 num++;
 390                         }
 391                         break;
 392                 case CTL_CH('b'):
 393                         if (num) {
 394                                 getcmd_putch(CTL_BACKSPACE);
 395                                 num--;
 396                         }
 397                         break;
 398                 case CTL_CH('d'):
 399                         if (num < eol_num) {
 400                                 wlen = eol_num - num - 1;
 401                                 if (wlen) {
 402                                         memmove(&buf[num], &buf[num+1], wlen);
 403                                         putnstr(buf + num, wlen);
 404                                 }
 405
 406                                 getcmd_putch(' ');
 407                                 do {
 408                                         getcmd_putch(CTL_BACKSPACE);
 409                                 } while (wlen--);
 410                                 eol_num--;
 411                         }
 412                         break;
 413                 case CTL_CH('k'):
 414                         ERASE_TO_EOL();
 415                         break;
 416                 case CTL_CH('e'):
 417                         REFRESH_TO_EOL();
 418                         break;
 419                 case CTL_CH('o'):
 420                         insert = !insert;
 421                         break;
 422                 case CTL_CH('x'):
 423                 case CTL_CH('u'):
 424                         BEGINNING_OF_LINE();
 425                         ERASE_TO_EOL();
 426                         break;
 427                 case DEL:
 428                 case DEL7:
 429                 case 8:
 430                         if (num) {
 431                                 wlen = eol_num - num;
 432                                 num--;
 433                                 memmove(&buf[num], &buf[num+1], wlen);
 434                                 getcmd_putch(CTL_BACKSPACE);
 435                                 putnstr(buf + num, wlen);
 436                                 getcmd_putch(' ');
 437                                 do {
 438                                         getcmd_putch(CTL_BACKSPACE);
 439                                 } while (wlen--);
 440                                 eol_num--;
 441                         }
 442                         break;
 443                 case CTL_CH('p'):
 444                 case CTL_CH('n'):
 445                 {
 446                         char *hline;
 447
 448                         esc_len = 0;
 449
 450                         if (ichar == CTL_CH('p'))
 451                                 hline = hist_prev();
 452                         else
 453                                 hline = hist_next();
 454
 455                         if (!hline) {
 456                                 getcmd_cbeep();
 457                                 continue;
 458                         }
 459
 460                         /* nuke the current line */
 461                         /* first, go home */
 462                         BEGINNING_OF_LINE();
 463
 464                         /* erase to end of line */
 465                         ERASE_TO_EOL();
 466
 467                         /* copy new line into place and display */
 468                         strcpy(buf, hline);
 469                         eol_num = strlen(buf);
 470                         REFRESH_TO_EOL();
 471                         continue;
 472                 }
 473 #ifdef CONFIG_AUTO_COMPLETE
 474                 case '\t': {
 475                         int num2, col;
 476
 477                         /* do not autocomplete when in the middle */
 478                         if (num < eol_num) {
 479                                 getcmd_cbeep();
 480                                 break;
 481                         }
 482
 483                         buf[num] = '\0';
 484                         col = strlen(prompt) + eol_num;
 485                         num2 = num;
 486                         if (cmd_auto_complete(prompt, buf, &num2, &col)) {
 487                                 col = num2 - num;
 488                                 num += col;
 489                                 eol_num += col;
 490                         }
 491                         break;
 492                 }
 493 #endif
 494                 default:
 495                         cread_add_char(ichar, insert, &num, &eol_num, buf,
 496                                        *len);
 497                         break;
 498                 }
 499         }
 500         *len = eol_num;
 501         buf[eol_num] = '\0';    /* lose the newline */
 502
 503         if (buf[0] && buf[0] != CREAD_HIST_CHAR)
 504                 cread_add_to_hist(buf);
 505         hist_cur = hist_add_idx;
 506
 507         return 0;
 508 }
 509
 510 #endif /* CONFIG_CMDLINE_EDITING */
 511
 512 /****************************************************************************/
 513
 514 int cli_readline(const char *const prompt)
 515 {
 516         /*
 517          * If console_buffer isn't 0-length the user will be prompted to modify
 518          * it instead of entering it from scratch as desired.
 519          */
 520         console_buffer[0] = '\0';
 521
 522         return cli_readline_into_buffer(prompt, console_buffer, 0);
 523 }
 524
 525
 526 int cli_readline_into_buffer(const char *const prompt, char *buffer,
 527                              int timeout)
 528 {
 529         char *p = buffer;
 530 #ifdef CONFIG_CMDLINE_EDITING
 531         unsigned int len = CONFIG_SYS_CBSIZE;
 532         int rc;
 533         static int initted;
 534
 535         /*
 536          * History uses a global array which is not
 537          * writable until after relocation to RAM.
 538          * Revert to non-history version if still
 539          * running from flash.
 540          */
 541         if (gd->flags & GD_FLG_RELOC) {
 542                 if (!initted) {
 543                         hist_init();
 544                         initted = 1;
 545                 }
 546
 547                 if (prompt)
 548                         puts(prompt);
 549
 550                 rc = cread_line(prompt, p, &len, timeout);
 551                 return rc < 0 ? rc : len;
 552
 553         } else {
 554 #endif  /* CONFIG_CMDLINE_EDITING */
 555         char *p_buf = p;
 556         int     n = 0;                          /* buffer index         */
 557         int     plen = 0;                       /* prompt length        */
 558         int     col;                            /* output column cnt    */
 559         char    c;
 560
 561         /* print prompt */
 562         if (prompt) {
 563                 plen = strlen(prompt);
 564                 puts(prompt);
 565         }
 566         col = plen;
 567
 568         for (;;) {
 569                 if (bootretry_tstc_timeout())
 570                         return -2;      /* timed out */
 571                 WATCHDOG_RESET();       /* Trigger watchdog, if needed */
 572
 573                 c = getc();
 574
 575                 /*
 576                  * Special character handling
 577                  */
 578                 switch (c) {
 579                 case '\r':                      /* Enter                */
 580                 case '\n':
 581                         *p = '\0';
 582                         puts("\r\n");
 583                         return p - p_buf;
 584
 585                 case '\0':                      /* nul                  */
 586                         continue;
 587
 588                 case 0x03:                      /* ^C - break           */
 589                         p_buf[0] = '\0';        /* discard input */
 590                         return -1;
 591
 592                 case 0x15:                      /* ^U - erase line      */
 593                         while (col > plen) {
 594                                 puts(erase_seq);
 595                                 --col;
 596                         }
 597                         p = p_buf;
 598                         n = 0;
 599                         continue;
 600
 601                 case 0x17:                      /* ^W - erase word      */
 602                         p = delete_char(p_buf, p, &col, &n, plen);
 603                         while ((n > 0) && (*p != ' '))
 604                                 p = delete_char(p_buf, p, &col, &n, plen);
 605                         continue;
 606
 607                 case 0x08:                      /* ^H  - backspace      */
 608                 case 0x7F:                      /* DEL - backspace      */
 609                         p = delete_char(p_buf, p, &col, &n, plen);
 610                         continue;
 611
 612                 default:
 613                         /*
 614                          * Must be a normal character then
 615                          */
 616                         if (n < CONFIG_SYS_CBSIZE-2) {
 617                                 if (c == '\t') {        /* expand TABs */
 618 #ifdef CONFIG_AUTO_COMPLETE
 619                                         /*
 620                                          * if auto completion triggered just
 621                                          * continue
 622                                          */
 623                                         *p = '\0';
 624                                         if (cmd_auto_complete(prompt,
 625                                                               console_buffer,
 626                                                               &n, &col)) {
 627                                                 p = p_buf + n;  /* reset */
 628                                                 continue;
 629                                         }
 630 #endif
 631                                         puts(tab_seq + (col & 07));
 632                                         col += 8 - (col & 07);
 633                                 } else {
 634                                         char __maybe_unused buf[2];
 635
 636                                         /*
 637                                          * Echo input using puts() to force an
 638                                          * LCD flush if we are using an LCD
 639                                          */
 640                                         ++col;
 641                                         buf[0] = c;
 642                                         buf[1] = '\0';
 643                                         puts(buf);
 644                                 }
 645                                 *p++ = c;
 646                                 ++n;
 647                         } else {                        /* Buffer full */
 648                                 putc('\a');
 649                         }
 650                 }
 651         }
 652 #ifdef CONFIG_CMDLINE_EDITING
 653         }
 654 #endif
 655 }