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