common/command.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000-2009
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 /*
   8  *  Command Processor Table
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13 #include <console.h>
  14 #include <env.h>
  15 #include <linux/ctype.h>
  16
  17 /*
  18  * Use puts() instead of printf() to avoid printf buffer overflow
  19  * for long help messages
  20  */
  21
  22 int _do_help(struct cmd_tbl *cmd_start, int cmd_items, struct cmd_tbl *cmdtp,
  23              int flag, int argc, char *const argv[])
  24 {
  25         int i;
  26         int rcode = 0;
  27
  28         if (argc == 1) {        /* show list of commands */
  29                 struct cmd_tbl *cmd_array[cmd_items];
  30                 int i, j, swaps;
  31
  32                 /* Make array of commands from .uboot_cmd section */
  33                 cmdtp = cmd_start;
  34                 for (i = 0; i < cmd_items; i++) {
  35                         cmd_array[i] = cmdtp++;
  36                 }
  37
  38                 /* Sort command list (trivial bubble sort) */
  39                 for (i = cmd_items - 1; i > 0; --i) {
  40                         swaps = 0;
  41                         for (j = 0; j < i; ++j) {
  42                                 if (strcmp(cmd_array[j]->name,
  43                                            cmd_array[j + 1]->name) > 0) {
  44                                         struct cmd_tbl *tmp;
  45                                         tmp = cmd_array[j];
  46                                         cmd_array[j] = cmd_array[j + 1];
  47                                         cmd_array[j + 1] = tmp;
  48                                         ++swaps;
  49                                 }
  50                         }
  51                         if (!swaps)
  52                                 break;
  53                 }
  54
  55                 /* print short help (usage) */
  56                 for (i = 0; i < cmd_items; i++) {
  57                         const char *usage = cmd_array[i]->usage;
  58
  59                         /* allow user abort */
  60                         if (ctrlc())
  61                                 return 1;
  62                         if (usage == NULL)
  63                                 continue;
  64                         printf("%-*s- %s\n", CONFIG_SYS_HELP_CMD_WIDTH,
  65                                cmd_array[i]->name, usage);
  66                 }
  67                 return 0;
  68         }
  69         /*
  70          * command help (long version)
  71          */
  72         for (i = 1; i < argc; ++i) {
  73                 cmdtp = find_cmd_tbl(argv[i], cmd_start, cmd_items);
  74                 if (cmdtp != NULL) {
  75                         rcode |= cmd_usage(cmdtp);
  76                 } else {
  77                         printf("Unknown command '%s' - try 'help' without arguments for list of all known commands\n\n",
  78                                argv[i]);
  79                         rcode = 1;
  80                 }
  81         }
  82         return rcode;
  83 }
  84
  85 /* find command table entry for a command */
  86 struct cmd_tbl *find_cmd_tbl(const char *cmd, struct cmd_tbl *table,
  87                              int table_len)
  88 {
  89 #ifdef CONFIG_CMDLINE
  90         struct cmd_tbl *cmdtp;
  91         struct cmd_tbl *cmdtp_temp = table;     /* Init value */
  92         const char *p;
  93         int len;
  94         int n_found = 0;
  95
  96         if (!cmd)
  97                 return NULL;
  98         /*
  99          * Some commands allow length modifiers (like "cp.b");
 100          * compare command name only until first dot.
 101          */
 102         len = ((p = strchr(cmd, '.')) == NULL) ? strlen (cmd) : (p - cmd);
 103
 104         for (cmdtp = table; cmdtp != table + table_len; cmdtp++) {
 105                 if (strncmp(cmd, cmdtp->name, len) == 0) {
 106                         if (len == strlen(cmdtp->name))
 107                                 return cmdtp;   /* full match */
 108
 109                         cmdtp_temp = cmdtp;     /* abbreviated command ? */
 110                         n_found++;
 111                 }
 112         }
 113         if (n_found == 1) {                     /* exactly one match */
 114                 return cmdtp_temp;
 115         }
 116 #endif /* CONFIG_CMDLINE */
 117
 118         return NULL;    /* not found or ambiguous command */
 119 }
 120
 121 struct cmd_tbl *find_cmd(const char *cmd)
 122 {
 123         struct cmd_tbl *start = ll_entry_start(struct cmd_tbl, cmd);
 124         const int len = ll_entry_count(struct cmd_tbl, cmd);
 125         return find_cmd_tbl(cmd, start, len);
 126 }
 127
 128 int cmd_usage(const struct cmd_tbl *cmdtp)
 129 {
 130         printf("%s - %s\n\n", cmdtp->name, cmdtp->usage);
 131
 132 #ifdef  CONFIG_SYS_LONGHELP
 133         printf("Usage:\n%s ", cmdtp->name);
 134
 135         if (!cmdtp->help) {
 136                 puts ("- No additional help available.\n");
 137                 return 1;
 138         }
 139
 140         puts(cmdtp->help);
 141         putc('\n');
 142 #endif  /* CONFIG_SYS_LONGHELP */
 143         return 1;
 144 }
 145
 146 #ifdef CONFIG_AUTO_COMPLETE
 147 static char env_complete_buf[512];
 148
 149 int var_complete(int argc, char *const argv[], char last_char, int maxv,
 150                  char *cmdv[])
 151 {
 152         int space;
 153
 154         space = last_char == '\0' || isblank(last_char);
 155
 156         if (space && argc == 1)
 157                 return env_complete("", maxv, cmdv, sizeof(env_complete_buf),
 158                                     env_complete_buf, false);
 159
 160         if (!space && argc == 2)
 161                 return env_complete(argv[1], maxv, cmdv,
 162                                     sizeof(env_complete_buf),
 163                                     env_complete_buf, false);
 164
 165         return 0;
 166 }
 167
 168 static int dollar_complete(int argc, char *const argv[], char last_char,
 169                            int maxv, char *cmdv[])
 170 {
 171         /* Make sure the last argument starts with a $. */
 172         if (argc < 1 || argv[argc - 1][0] != '$' ||
 173             last_char == '\0' || isblank(last_char))
 174                 return 0;
 175
 176         return env_complete(argv[argc - 1], maxv, cmdv, sizeof(env_complete_buf),
 177                             env_complete_buf, true);
 178 }
 179
 180 /*************************************************************************************/
 181
 182 int complete_subcmdv(struct cmd_tbl *cmdtp, int count, int argc,
 183                      char *const argv[], char last_char,
 184                      int maxv, char *cmdv[])
 185 {
 186 #ifdef CONFIG_CMDLINE
 187         const struct cmd_tbl *cmdend = cmdtp + count;
 188         const char *p;
 189         int len, clen;
 190         int n_found = 0;
 191         const char *cmd;
 192
 193         /* sanity? */
 194         if (maxv < 2)
 195                 return -2;
 196
 197         cmdv[0] = NULL;
 198
 199         if (argc == 0) {
 200                 /* output full list of commands */
 201                 for (; cmdtp != cmdend; cmdtp++) {
 202                         if (n_found >= maxv - 2) {
 203                                 cmdv[n_found++] = "...";
 204                                 break;
 205                         }
 206                         cmdv[n_found++] = cmdtp->name;
 207                 }
 208                 cmdv[n_found] = NULL;
 209                 return n_found;
 210         }
 211
 212         /* more than one arg or one but the start of the next */
 213         if (argc > 1 || last_char == '\0' || isblank(last_char)) {
 214                 cmdtp = find_cmd_tbl(argv[0], cmdtp, count);
 215                 if (cmdtp == NULL || cmdtp->complete == NULL) {
 216                         cmdv[0] = NULL;
 217                         return 0;
 218                 }
 219                 return (*cmdtp->complete)(argc, argv, last_char, maxv, cmdv);
 220         }
 221
 222         cmd = argv[0];
 223         /*
 224          * Some commands allow length modifiers (like "cp.b");
 225          * compare command name only until first dot.
 226          */
 227         p = strchr(cmd, '.');
 228         if (p == NULL)
 229                 len = strlen(cmd);
 230         else
 231                 len = p - cmd;
 232
 233         /* return the partial matches */
 234         for (; cmdtp != cmdend; cmdtp++) {
 235
 236                 clen = strlen(cmdtp->name);
 237                 if (clen < len)
 238                         continue;
 239
 240                 if (memcmp(cmd, cmdtp->name, len) != 0)
 241                         continue;
 242
 243                 /* too many! */
 244                 if (n_found >= maxv - 2) {
 245                         cmdv[n_found++] = "...";
 246                         break;
 247                 }
 248
 249                 cmdv[n_found++] = cmdtp->name;
 250         }
 251
 252         cmdv[n_found] = NULL;
 253         return n_found;
 254 #else
 255         return 0;
 256 #endif
 257 }
 258
 259 static int complete_cmdv(int argc, char *const argv[], char last_char,
 260                          int maxv, char *cmdv[])
 261 {
 262 #ifdef CONFIG_CMDLINE
 263         return complete_subcmdv(ll_entry_start(struct cmd_tbl, cmd),
 264                                 ll_entry_count(struct cmd_tbl, cmd), argc, argv,
 265                                 last_char, maxv, cmdv);
 266 #else
 267         return 0;
 268 #endif
 269 }
 270
 271 static int make_argv(char *s, int argvsz, char *argv[])
 272 {
 273         int argc = 0;
 274
 275         /* split into argv */
 276         while (argc < argvsz - 1) {
 277
 278                 /* skip any white space */
 279                 while (isblank(*s))
 280                         ++s;
 281
 282                 if (*s == '\0') /* end of s, no more args       */
 283                         break;
 284
 285                 argv[argc++] = s;       /* begin of argument string     */
 286
 287                 /* find end of string */
 288                 while (*s && !isblank(*s))
 289                         ++s;
 290
 291                 if (*s == '\0')         /* end of s, no more args       */
 292                         break;
 293
 294                 *s++ = '\0';            /* terminate current arg         */
 295         }
 296         argv[argc] = NULL;
 297
 298         return argc;
 299 }
 300
 301 static void print_argv(const char *banner, const char *leader, const char *sep,
 302                        int linemax, char *const argv[])
 303 {
 304         int ll = leader != NULL ? strlen(leader) : 0;
 305         int sl = sep != NULL ? strlen(sep) : 0;
 306         int len, i;
 307
 308         if (banner) {
 309                 puts("\n");
 310                 puts(banner);
 311         }
 312
 313         i = linemax;    /* force leader and newline */
 314         while (*argv != NULL) {
 315                 len = strlen(*argv) + sl;
 316                 if (i + len >= linemax) {
 317                         puts("\n");
 318                         if (leader)
 319                                 puts(leader);
 320                         i = ll - sl;
 321                 } else if (sep)
 322                         puts(sep);
 323                 puts(*argv++);
 324                 i += len;
 325         }
 326         printf("\n");
 327 }
 328
 329 static int find_common_prefix(char *const argv[])
 330 {
 331         int i, len;
 332         char *anchor, *s, *t;
 333
 334         if (*argv == NULL)
 335                 return 0;
 336
 337         /* begin with max */
 338         anchor = *argv++;
 339         len = strlen(anchor);
 340         while ((t = *argv++) != NULL) {
 341                 s = anchor;
 342                 for (i = 0; i < len; i++, t++, s++) {
 343                         if (*t != *s)
 344                                 break;
 345                 }
 346                 len = s - anchor;
 347         }
 348         return len;
 349 }
 350
 351 static char tmp_buf[CONFIG_SYS_CBSIZE + 1];     /* copy of console I/O buffer */
 352
 353 int cmd_auto_complete(const char *const prompt, char *buf, int *np, int *colp)
 354 {
 355         int n = *np, col = *colp;
 356         char *argv[CONFIG_SYS_MAXARGS + 1];             /* NULL terminated      */
 357         char *cmdv[20];
 358         char *s, *t;
 359         const char *sep;
 360         int i, j, k, len, seplen, argc;
 361         int cnt;
 362         char last_char;
 363 #ifdef CONFIG_CMDLINE_PS_SUPPORT
 364         const char *ps_prompt = env_get("PS1");
 365 #else
 366         const char *ps_prompt = CONFIG_SYS_PROMPT;
 367 #endif
 368
 369         if (strcmp(prompt, ps_prompt) != 0)
 370                 return 0;       /* not in normal console */
 371
 372         cnt = strlen(buf);
 373         if (cnt >= 1)
 374                 last_char = buf[cnt - 1];
 375         else
 376                 last_char = '\0';
 377
 378         /* copy to secondary buffer which will be affected */
 379         strcpy(tmp_buf, buf);
 380
 381         /* separate into argv */
 382         argc = make_argv(tmp_buf, sizeof(argv)/sizeof(argv[0]), argv);
 383
 384         /* first try a $ completion */
 385         i = dollar_complete(argc, argv, last_char,
 386                             sizeof(cmdv) / sizeof(cmdv[0]), cmdv);
 387         if (!i) {
 388                 /* do the completion and return the possible completions */
 389                 i = complete_cmdv(argc, argv, last_char,
 390                                   sizeof(cmdv) / sizeof(cmdv[0]), cmdv);
 391         }
 392
 393         /* no match; bell and out */
 394         if (i == 0) {
 395                 if (argc > 1)   /* allow tab for non command */
 396                         return 0;
 397                 putc('\a');
 398                 return 1;
 399         }
 400
 401         s = NULL;
 402         len = 0;
 403         sep = NULL;
 404         seplen = 0;
 405         if (i == 1) { /* one match; perfect */
 406                 if (last_char != '\0' && !isblank(last_char))
 407                         k = strlen(argv[argc - 1]);
 408                 else
 409                         k = 0;
 410
 411                 s = cmdv[0] + k;
 412                 len = strlen(s);
 413                 sep = " ";
 414                 seplen = 1;
 415         } else if (i > 1 && (j = find_common_prefix(cmdv)) != 0) { /* more */
 416                 if (last_char != '\0' && !isblank(last_char))
 417                         k = strlen(argv[argc - 1]);
 418                 else
 419                         k = 0;
 420
 421                 j -= k;
 422                 if (j > 0) {
 423                         s = cmdv[0] + k;
 424                         len = j;
 425                 }
 426         }
 427
 428         if (s != NULL) {
 429                 k = len + seplen;
 430                 /* make sure it fits */
 431                 if (n + k >= CONFIG_SYS_CBSIZE - 2) {
 432                         putc('\a');
 433                         return 1;
 434                 }
 435
 436                 t = buf + cnt;
 437                 for (i = 0; i < len; i++)
 438                         *t++ = *s++;
 439                 if (sep != NULL)
 440                         for (i = 0; i < seplen; i++)
 441                                 *t++ = sep[i];
 442                 *t = '\0';
 443                 n += k;
 444                 col += k;
 445                 puts(t - k);
 446                 if (sep == NULL)
 447                         putc('\a');
 448                 *np = n;
 449                 *colp = col;
 450         } else {
 451                 print_argv(NULL, "  ", " ", 78, cmdv);
 452
 453                 puts(prompt);
 454                 puts(buf);
 455         }
 456         return 1;
 457 }
 458
 459 #endif
 460
 461 #ifdef CMD_DATA_SIZE
 462 int cmd_get_data_size(char* arg, int default_size)
 463 {
 464         /* Check for a size specification .b, .w or .l.
 465          */
 466         int len = strlen(arg);
 467         if (len > 2 && arg[len-2] == '.') {
 468                 switch (arg[len-1]) {
 469                 case 'b':
 470                         return 1;
 471                 case 'w':
 472                         return 2;
 473                 case 'l':
 474                         return 4;
 475 #ifdef MEM_SUPPORT_64BIT_DATA
 476                 case 'q':
 477                         return 8;
 478 #endif
 479                 case 's':
 480                         return -2;
 481                 default:
 482                         return -1;
 483                 }
 484         }
 485         return default_size;
 486 }
 487 #endif
 488
 489 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 490 DECLARE_GLOBAL_DATA_PTR;
 491
 492 void fixup_cmdtable(struct cmd_tbl *cmdtp, int size)
 493 {
 494         int     i;
 495
 496         if (gd->reloc_off == 0)
 497                 return;
 498
 499         for (i = 0; i < size; i++) {
 500                 ulong addr;
 501
 502                 addr = (ulong)(cmdtp->cmd_rep) + gd->reloc_off;
 503                 cmdtp->cmd_rep =
 504                         (int (*)(struct cmd_tbl *, int, int,
 505                                  char * const [], int *))addr;
 506
 507                 addr = (ulong)(cmdtp->cmd) + gd->reloc_off;
 508 #ifdef DEBUG_COMMANDS
 509                 printf("Command \"%s\": 0x%08lx => 0x%08lx\n",
 510                        cmdtp->name, (ulong)(cmdtp->cmd), addr);
 511 #endif
 512                 cmdtp->cmd = (int (*)(struct cmd_tbl *, int, int,
 513                                       char *const []))addr;
 514                 addr = (ulong)(cmdtp->name) + gd->reloc_off;
 515                 cmdtp->name = (char *)addr;
 516                 if (cmdtp->usage) {
 517                         addr = (ulong)(cmdtp->usage) + gd->reloc_off;
 518                         cmdtp->usage = (char *)addr;
 519                 }
 520 #ifdef  CONFIG_SYS_LONGHELP
 521                 if (cmdtp->help) {
 522                         addr = (ulong)(cmdtp->help) + gd->reloc_off;
 523                         cmdtp->help = (char *)addr;
 524                 }
 525 #endif
 526 #ifdef CONFIG_AUTO_COMPLETE
 527                 if (cmdtp->complete) {
 528                         addr = (ulong)(cmdtp->complete) + gd->reloc_off;
 529                         cmdtp->complete =
 530                                 (int (*)(int, char * const [], char, int, char * []))addr;
 531                 }
 532 #endif
 533                 cmdtp++;
 534         }
 535 }
 536 #endif
 537
 538 int cmd_always_repeatable(struct cmd_tbl *cmdtp, int flag, int argc,
 539                           char *const argv[], int *repeatable)
 540 {
 541         *repeatable = 1;
 542
 543         return cmdtp->cmd(cmdtp, flag, argc, argv);
 544 }
 545
 546 int cmd_never_repeatable(struct cmd_tbl *cmdtp, int flag, int argc,
 547                          char *const argv[], int *repeatable)
 548 {
 549         *repeatable = 0;
 550
 551         return cmdtp->cmd(cmdtp, flag, argc, argv);
 552 }
 553
 554 int cmd_discard_repeatable(struct cmd_tbl *cmdtp, int flag, int argc,
 555                            char *const argv[])
 556 {
 557         int repeatable;
 558
 559         return cmdtp->cmd_rep(cmdtp, flag, argc, argv, &repeatable);
 560 }
 561
 562 /**
 563  * Call a command function. This should be the only route in U-Boot to call
 564  * a command, so that we can track whether we are waiting for input or
 565  * executing a command.
 566  *
 567  * @param cmdtp         Pointer to the command to execute
 568  * @param flag          Some flags normally 0 (see CMD_FLAG_.. above)
 569  * @param argc          Number of arguments (arg 0 must be the command text)
 570  * @param argv          Arguments
 571  * @param repeatable    Can the command be repeated
 572  * @return 0 if command succeeded, else non-zero (CMD_RET_...)
 573  */
 574 static int cmd_call(struct cmd_tbl *cmdtp, int flag, int argc,
 575                     char *const argv[], int *repeatable)
 576 {
 577         int result;
 578
 579         result = cmdtp->cmd_rep(cmdtp, flag, argc, argv, repeatable);
 580         if (result)
 581                 debug("Command failed, result=%d\n", result);
 582         return result;
 583 }
 584
 585 enum command_ret_t cmd_process(int flag, int argc, char *const argv[],
 586                                int *repeatable, ulong *ticks)
 587 {
 588         enum command_ret_t rc = CMD_RET_SUCCESS;
 589         struct cmd_tbl *cmdtp;
 590
 591 #if defined(CONFIG_SYS_XTRACE)
 592         char *xtrace;
 593
 594         xtrace = env_get("xtrace");
 595         if (xtrace) {
 596                 puts("+");
 597                 for (int i = 0; i < argc; i++) {
 598                         puts(" ");
 599                         puts(argv[i]);
 600                 }
 601                 puts("\n");
 602         }
 603 #endif
 604
 605         /* Look up command in command table */
 606         cmdtp = find_cmd(argv[0]);
 607         if (cmdtp == NULL) {
 608                 printf("Unknown command '%s' - try 'help'\n", argv[0]);
 609                 return 1;
 610         }
 611
 612         /* found - check max args */
 613         if (argc > cmdtp->maxargs)
 614                 rc = CMD_RET_USAGE;
 615
 616 #if defined(CONFIG_CMD_BOOTD)
 617         /* avoid "bootd" recursion */
 618         else if (cmdtp->cmd == do_bootd) {
 619                 if (flag & CMD_FLAG_BOOTD) {
 620                         puts("'bootd' recursion detected\n");
 621                         rc = CMD_RET_FAILURE;
 622                 } else {
 623                         flag |= CMD_FLAG_BOOTD;
 624                 }
 625         }
 626 #endif
 627
 628         /* If OK so far, then do the command */
 629         if (!rc) {
 630                 int newrep;
 631
 632                 if (ticks)
 633                         *ticks = get_timer(0);
 634                 rc = cmd_call(cmdtp, flag, argc, argv, &newrep);
 635                 if (ticks)
 636                         *ticks = get_timer(*ticks);
 637                 *repeatable &= newrep;
 638         }
 639         if (rc == CMD_RET_USAGE)
 640                 rc = cmd_usage(cmdtp);
 641         return rc;
 642 }
 643
 644 int cmd_process_error(struct cmd_tbl *cmdtp, int err)
 645 {
 646         if (err == CMD_RET_USAGE)
 647                 return CMD_RET_USAGE;
 648
 649         if (err) {
 650                 printf("Command '%s' failed: Error %d\n", cmdtp->name, err);
 651                 return CMD_RET_FAILURE;
 652         }
 653
 654         return CMD_RET_SUCCESS;
 655 }