common/command.c

   1 /*
   2  * (C) Copyright 2000-2009
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /*
   9  *  Command Processor Table
  10  */
  11
  12 #include <common.h>
  13 #include <command.h>
  14 #include <console.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
 147 int var_complete(int argc, char * const argv[], char last_char, int maxv, char *cmdv[])
 148 {
 149         static char tmp_buf[512];
 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(tmp_buf), tmp_buf);
 156
 157         if (!space && argc == 2)
 158                 return env_complete(argv[1], maxv, cmdv, sizeof(tmp_buf), tmp_buf);
 159
 160         return 0;
 161 }
 162
 163 /*************************************************************************************/
 164
 165 static int complete_cmdv(int argc, char * const argv[], char last_char, int maxv, char *cmdv[])
 166 {
 167 #ifdef CONFIG_CMDLINE
 168         cmd_tbl_t *cmdtp = ll_entry_start(cmd_tbl_t, cmd);
 169         const int count = ll_entry_count(cmd_tbl_t, cmd);
 170         const cmd_tbl_t *cmdend = cmdtp + count;
 171         const char *p;
 172         int len, clen;
 173         int n_found = 0;
 174         const char *cmd;
 175
 176         /* sanity? */
 177         if (maxv < 2)
 178                 return -2;
 179
 180         cmdv[0] = NULL;
 181
 182         if (argc == 0) {
 183                 /* output full list of commands */
 184                 for (; cmdtp != cmdend; cmdtp++) {
 185                         if (n_found >= maxv - 2) {
 186                                 cmdv[n_found++] = "...";
 187                                 break;
 188                         }
 189                         cmdv[n_found++] = cmdtp->name;
 190                 }
 191                 cmdv[n_found] = NULL;
 192                 return n_found;
 193         }
 194
 195         /* more than one arg or one but the start of the next */
 196         if (argc > 1 || last_char == '\0' || isblank(last_char)) {
 197                 cmdtp = find_cmd(argv[0]);
 198                 if (cmdtp == NULL || cmdtp->complete == NULL) {
 199                         cmdv[0] = NULL;
 200                         return 0;
 201                 }
 202                 return (*cmdtp->complete)(argc, argv, last_char, maxv, cmdv);
 203         }
 204
 205         cmd = argv[0];
 206         /*
 207          * Some commands allow length modifiers (like "cp.b");
 208          * compare command name only until first dot.
 209          */
 210         p = strchr(cmd, '.');
 211         if (p == NULL)
 212                 len = strlen(cmd);
 213         else
 214                 len = p - cmd;
 215
 216         /* return the partial matches */
 217         for (; cmdtp != cmdend; cmdtp++) {
 218
 219                 clen = strlen(cmdtp->name);
 220                 if (clen < len)
 221                         continue;
 222
 223                 if (memcmp(cmd, cmdtp->name, len) != 0)
 224                         continue;
 225
 226                 /* too many! */
 227                 if (n_found >= maxv - 2) {
 228                         cmdv[n_found++] = "...";
 229                         break;
 230                 }
 231
 232                 cmdv[n_found++] = cmdtp->name;
 233         }
 234
 235         cmdv[n_found] = NULL;
 236         return n_found;
 237 #else
 238         return 0;
 239 #endif
 240 }
 241
 242 static int make_argv(char *s, int argvsz, char *argv[])
 243 {
 244         int argc = 0;
 245
 246         /* split into argv */
 247         while (argc < argvsz - 1) {
 248
 249                 /* skip any white space */
 250                 while (isblank(*s))
 251                         ++s;
 252
 253                 if (*s == '\0') /* end of s, no more args       */
 254                         break;
 255
 256                 argv[argc++] = s;       /* begin of argument string     */
 257
 258                 /* find end of string */
 259                 while (*s && !isblank(*s))
 260                         ++s;
 261
 262                 if (*s == '\0')         /* end of s, no more args       */
 263                         break;
 264
 265                 *s++ = '\0';            /* terminate current arg         */
 266         }
 267         argv[argc] = NULL;
 268
 269         return argc;
 270 }
 271
 272 static void print_argv(const char *banner, const char *leader, const char *sep, int linemax, char * const argv[])
 273 {
 274         int ll = leader != NULL ? strlen(leader) : 0;
 275         int sl = sep != NULL ? strlen(sep) : 0;
 276         int len, i;
 277
 278         if (banner) {
 279                 puts("\n");
 280                 puts(banner);
 281         }
 282
 283         i = linemax;    /* force leader and newline */
 284         while (*argv != NULL) {
 285                 len = strlen(*argv) + sl;
 286                 if (i + len >= linemax) {
 287                         puts("\n");
 288                         if (leader)
 289                                 puts(leader);
 290                         i = ll - sl;
 291                 } else if (sep)
 292                         puts(sep);
 293                 puts(*argv++);
 294                 i += len;
 295         }
 296         printf("\n");
 297 }
 298
 299 static int find_common_prefix(char * const argv[])
 300 {
 301         int i, len;
 302         char *anchor, *s, *t;
 303
 304         if (*argv == NULL)
 305                 return 0;
 306
 307         /* begin with max */
 308         anchor = *argv++;
 309         len = strlen(anchor);
 310         while ((t = *argv++) != NULL) {
 311                 s = anchor;
 312                 for (i = 0; i < len; i++, t++, s++) {
 313                         if (*t != *s)
 314                                 break;
 315                 }
 316                 len = s - anchor;
 317         }
 318         return len;
 319 }
 320
 321 static char tmp_buf[CONFIG_SYS_CBSIZE + 1];     /* copy of console I/O buffer */
 322
 323 int cmd_auto_complete(const char *const prompt, char *buf, int *np, int *colp)
 324 {
 325         int n = *np, col = *colp;
 326         char *argv[CONFIG_SYS_MAXARGS + 1];             /* NULL terminated      */
 327         char *cmdv[20];
 328         char *s, *t;
 329         const char *sep;
 330         int i, j, k, len, seplen, argc;
 331         int cnt;
 332         char last_char;
 333
 334         if (strcmp(prompt, CONFIG_SYS_PROMPT) != 0)
 335                 return 0;       /* not in normal console */
 336
 337         cnt = strlen(buf);
 338         if (cnt >= 1)
 339                 last_char = buf[cnt - 1];
 340         else
 341                 last_char = '\0';
 342
 343         /* copy to secondary buffer which will be affected */
 344         strcpy(tmp_buf, buf);
 345
 346         /* separate into argv */
 347         argc = make_argv(tmp_buf, sizeof(argv)/sizeof(argv[0]), argv);
 348
 349         /* do the completion and return the possible completions */
 350         i = complete_cmdv(argc, argv, last_char,
 351                           sizeof(cmdv) / sizeof(cmdv[0]), cmdv);
 352
 353         /* no match; bell and out */
 354         if (i == 0) {
 355                 if (argc > 1)   /* allow tab for non command */
 356                         return 0;
 357                 putc('\a');
 358                 return 1;
 359         }
 360
 361         s = NULL;
 362         len = 0;
 363         sep = NULL;
 364         seplen = 0;
 365         if (i == 1) { /* one match; perfect */
 366                 k = strlen(argv[argc - 1]);
 367                 s = cmdv[0] + k;
 368                 len = strlen(s);
 369                 sep = " ";
 370                 seplen = 1;
 371         } else if (i > 1 && (j = find_common_prefix(cmdv)) != 0) { /* more */
 372                 k = strlen(argv[argc - 1]);
 373                 j -= k;
 374                 if (j > 0) {
 375                         s = cmdv[0] + k;
 376                         len = j;
 377                 }
 378         }
 379
 380         if (s != NULL) {
 381                 k = len + seplen;
 382                 /* make sure it fits */
 383                 if (n + k >= CONFIG_SYS_CBSIZE - 2) {
 384                         putc('\a');
 385                         return 1;
 386                 }
 387
 388                 t = buf + cnt;
 389                 for (i = 0; i < len; i++)
 390                         *t++ = *s++;
 391                 if (sep != NULL)
 392                         for (i = 0; i < seplen; i++)
 393                                 *t++ = sep[i];
 394                 *t = '\0';
 395                 n += k;
 396                 col += k;
 397                 puts(t - k);
 398                 if (sep == NULL)
 399                         putc('\a');
 400                 *np = n;
 401                 *colp = col;
 402         } else {
 403                 print_argv(NULL, "  ", " ", 78, cmdv);
 404
 405                 puts(prompt);
 406                 puts(buf);
 407         }
 408         return 1;
 409 }
 410
 411 #endif
 412
 413 #ifdef CMD_DATA_SIZE
 414 int cmd_get_data_size(char* arg, int default_size)
 415 {
 416         /* Check for a size specification .b, .w or .l.
 417          */
 418         int len = strlen(arg);
 419         if (len > 2 && arg[len-2] == '.') {
 420                 switch (arg[len-1]) {
 421                 case 'b':
 422                         return 1;
 423                 case 'w':
 424                         return 2;
 425                 case 'l':
 426                         return 4;
 427 #ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
 428                 case 'q':
 429                         return 8;
 430 #endif
 431                 case 's':
 432                         return -2;
 433                 default:
 434                         return -1;
 435                 }
 436         }
 437         return default_size;
 438 }
 439 #endif
 440
 441 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 442 DECLARE_GLOBAL_DATA_PTR;
 443
 444 void fixup_cmdtable(cmd_tbl_t *cmdtp, int size)
 445 {
 446         int     i;
 447
 448         if (gd->reloc_off == 0)
 449                 return;
 450
 451         for (i = 0; i < size; i++) {
 452                 ulong addr;
 453
 454                 addr = (ulong)(cmdtp->cmd) + gd->reloc_off;
 455 #ifdef DEBUG_COMMANDS
 456                 printf("Command \"%s\": 0x%08lx => 0x%08lx\n",
 457                        cmdtp->name, (ulong)(cmdtp->cmd), addr);
 458 #endif
 459                 cmdtp->cmd =
 460                         (int (*)(struct cmd_tbl_s *, int, int, char * const []))addr;
 461                 addr = (ulong)(cmdtp->name) + gd->reloc_off;
 462                 cmdtp->name = (char *)addr;
 463                 if (cmdtp->usage) {
 464                         addr = (ulong)(cmdtp->usage) + gd->reloc_off;
 465                         cmdtp->usage = (char *)addr;
 466                 }
 467 #ifdef  CONFIG_SYS_LONGHELP
 468                 if (cmdtp->help) {
 469                         addr = (ulong)(cmdtp->help) + gd->reloc_off;
 470                         cmdtp->help = (char *)addr;
 471                 }
 472 #endif
 473 #ifdef CONFIG_AUTO_COMPLETE
 474                 if (cmdtp->complete) {
 475                         addr = (ulong)(cmdtp->complete) + gd->reloc_off;
 476                         cmdtp->complete =
 477                                 (int (*)(int, char * const [], char, int, char * []))addr;
 478                 }
 479 #endif
 480                 cmdtp++;
 481         }
 482 }
 483 #endif
 484
 485 /**
 486  * Call a command function. This should be the only route in U-Boot to call
 487  * a command, so that we can track whether we are waiting for input or
 488  * executing a command.
 489  *
 490  * @param cmdtp         Pointer to the command to execute
 491  * @param flag          Some flags normally 0 (see CMD_FLAG_.. above)
 492  * @param argc          Number of arguments (arg 0 must be the command text)
 493  * @param argv          Arguments
 494  * @return 0 if command succeeded, else non-zero (CMD_RET_...)
 495  */
 496 static int cmd_call(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 497 {
 498         int result;
 499
 500         result = (cmdtp->cmd)(cmdtp, flag, argc, argv);
 501         if (result)
 502                 debug("Command failed, result=%d\n", result);
 503         return result;
 504 }
 505
 506 enum command_ret_t cmd_process(int flag, int argc, char * const argv[],
 507                                int *repeatable, ulong *ticks)
 508 {
 509         enum command_ret_t rc = CMD_RET_SUCCESS;
 510         cmd_tbl_t *cmdtp;
 511
 512         /* Look up command in command table */
 513         cmdtp = find_cmd(argv[0]);
 514         if (cmdtp == NULL) {
 515                 printf("Unknown command '%s' - try 'help'\n", argv[0]);
 516                 return 1;
 517         }
 518
 519         /* found - check max args */
 520         if (argc > cmdtp->maxargs)
 521                 rc = CMD_RET_USAGE;
 522
 523 #if defined(CONFIG_CMD_BOOTD)
 524         /* avoid "bootd" recursion */
 525         else if (cmdtp->cmd == do_bootd) {
 526                 if (flag & CMD_FLAG_BOOTD) {
 527                         puts("'bootd' recursion detected\n");
 528                         rc = CMD_RET_FAILURE;
 529                 } else {
 530                         flag |= CMD_FLAG_BOOTD;
 531                 }
 532         }
 533 #endif
 534
 535         /* If OK so far, then do the command */
 536         if (!rc) {
 537                 if (ticks)
 538                         *ticks = get_timer(0);
 539                 rc = cmd_call(cmdtp, flag, argc, argv);
 540                 if (ticks)
 541                         *ticks = get_timer(*ticks);
 542                 *repeatable &= cmdtp->repeatable;
 543         }
 544         if (rc == CMD_RET_USAGE)
 545                 rc = cmd_usage(cmdtp);
 546         return rc;
 547 }
 548
 549 int cmd_process_error(cmd_tbl_t *cmdtp, int err)
 550 {
 551         if (err) {
 552                 printf("Command '%s' failed: Error %d\n", cmdtp->name, err);
 553                 return 1;
 554         }
 555
 556         return 0;
 557 }