common/cmd_nvedit.c

   1 /*
   2  * (C) Copyright 2000-2013
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   6  * Andreas Heppel <aheppel@sysgo.de>
   7  *
   8  * Copyright 2011 Freescale Semiconductor, Inc.
   9  *
  10  * SPDX-License-Identifier:     GPL-2.0+
  11  */
  12
  13 /*
  14  * Support for persistent environment data
  15  *
  16  * The "environment" is stored on external storage as a list of '\0'
  17  * terminated "name=value" strings. The end of the list is marked by
  18  * a double '\0'. The environment is preceeded by a 32 bit CRC over
  19  * the data part and, in case of redundant environment, a byte of
  20  * flags.
  21  *
  22  * This linearized representation will also be used before
  23  * relocation, i. e. as long as we don't have a full C runtime
  24  * environment. After that, we use a hash table.
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <environment.h>
  30 #include <search.h>
  31 #include <errno.h>
  32 #include <malloc.h>
  33 #include <watchdog.h>
  34 #include <linux/stddef.h>
  35 #include <asm/byteorder.h>
  36
  37 DECLARE_GLOBAL_DATA_PTR;
  38
  39 #if     !defined(CONFIG_ENV_IS_IN_EEPROM)       && \
  40         !defined(CONFIG_ENV_IS_IN_FLASH)        && \
  41         !defined(CONFIG_ENV_IS_IN_DATAFLASH)    && \
  42         !defined(CONFIG_ENV_IS_IN_MMC)          && \
  43         !defined(CONFIG_ENV_IS_IN_FAT)          && \
  44         !defined(CONFIG_ENV_IS_IN_NAND)         && \
  45         !defined(CONFIG_ENV_IS_IN_NVRAM)        && \
  46         !defined(CONFIG_ENV_IS_IN_ONENAND)      && \
  47         !defined(CONFIG_ENV_IS_IN_SPI_FLASH)    && \
  48         !defined(CONFIG_ENV_IS_IN_REMOTE)       && \
  49         !defined(CONFIG_ENV_IS_IN_UBI)          && \
  50         !defined(CONFIG_ENV_IS_NOWHERE)
  51 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|DATAFLASH|ONENAND|\
  52 SPI_FLASH|NVRAM|MMC|FAT|REMOTE|UBI} or CONFIG_ENV_IS_NOWHERE
  53 #endif
  54
  55 /*
  56  * Maximum expected input data size for import command
  57  */
  58 #define MAX_ENV_SIZE    (1 << 20)       /* 1 MiB */
  59
  60 /*
  61  * This variable is incremented on each do_env_set(), so it can
  62  * be used via get_env_id() as an indication, if the environment
  63  * has changed or not. So it is possible to reread an environment
  64  * variable only if the environment was changed ... done so for
  65  * example in NetInitLoop()
  66  */
  67 static int env_id = 1;
  68
  69 int get_env_id(void)
  70 {
  71         return env_id;
  72 }
  73
  74 #ifndef CONFIG_SPL_BUILD
  75 /*
  76  * Command interface: print one or all environment variables
  77  *
  78  * Returns 0 in case of error, or length of printed string
  79  */
  80 static int env_print(char *name, int flag)
  81 {
  82         char *res = NULL;
  83         ssize_t len;
  84
  85         if (name) {             /* print a single name */
  86                 ENTRY e, *ep;
  87
  88                 e.key = name;
  89                 e.data = NULL;
  90                 hsearch_r(e, FIND, &ep, &env_htab, flag);
  91                 if (ep == NULL)
  92                         return 0;
  93                 len = printf("%s=%s\n", ep->key, ep->data);
  94                 return len;
  95         }
  96
  97         /* print whole list */
  98         len = hexport_r(&env_htab, '\n', flag, &res, 0, 0, NULL);
  99
 100         if (len > 0) {
 101                 puts(res);
 102                 free(res);
 103                 return len;
 104         }
 105
 106         /* should never happen */
 107         printf("## Error: cannot export environment\n");
 108         return 0;
 109 }
 110
 111 static int do_env_print(cmd_tbl_t *cmdtp, int flag, int argc,
 112                         char * const argv[])
 113 {
 114         int i;
 115         int rcode = 0;
 116         int env_flag = H_HIDE_DOT;
 117
 118         if (argc > 1 && argv[1][0] == '-' && argv[1][1] == 'a') {
 119                 argc--;
 120                 argv++;
 121                 env_flag &= ~H_HIDE_DOT;
 122         }
 123
 124         if (argc == 1) {
 125                 /* print all env vars */
 126                 rcode = env_print(NULL, env_flag);
 127                 if (!rcode)
 128                         return 1;
 129                 printf("\nEnvironment size: %d/%ld bytes\n",
 130                         rcode, (ulong)ENV_SIZE);
 131                 return 0;
 132         }
 133
 134         /* print selected env vars */
 135         env_flag &= ~H_HIDE_DOT;
 136         for (i = 1; i < argc; ++i) {
 137                 int rc = env_print(argv[i], env_flag);
 138                 if (!rc) {
 139                         printf("## Error: \"%s\" not defined\n", argv[i]);
 140                         ++rcode;
 141                 }
 142         }
 143
 144         return rcode;
 145 }
 146
 147 #ifdef CONFIG_CMD_GREPENV
 148 static int do_env_grep(cmd_tbl_t *cmdtp, int flag,
 149                        int argc, char * const argv[])
 150 {
 151         char *res = NULL;
 152         int len, grep_how, grep_what;
 153
 154         if (argc < 2)
 155                 return CMD_RET_USAGE;
 156
 157         grep_how  = H_MATCH_SUBSTR;     /* default: substring search    */
 158         grep_what = H_MATCH_BOTH;       /* default: grep names and values */
 159
 160         while (--argc > 0 && **++argv == '-') {
 161                 char *arg = *argv;
 162                 while (*++arg) {
 163                         switch (*arg) {
 164 #ifdef CONFIG_REGEX
 165                         case 'e':               /* use regex matching */
 166                                 grep_how  = H_MATCH_REGEX;
 167                                 break;
 168 #endif
 169                         case 'n':               /* grep for name */
 170                                 grep_what = H_MATCH_KEY;
 171                                 break;
 172                         case 'v':               /* grep for value */
 173                                 grep_what = H_MATCH_DATA;
 174                                 break;
 175                         case 'b':               /* grep for both */
 176                                 grep_what = H_MATCH_BOTH;
 177                                 break;
 178                         case '-':
 179                                 goto DONE;
 180                         default:
 181                                 return CMD_RET_USAGE;
 182                         }
 183                 }
 184         }
 185
 186 DONE:
 187         len = hexport_r(&env_htab, '\n',
 188                         flag | grep_what | grep_how,
 189                         &res, 0, argc, argv);
 190
 191         if (len > 0) {
 192                 puts(res);
 193                 free(res);
 194         }
 195
 196         if (len < 2)
 197                 return 1;
 198
 199         return 0;
 200 }
 201 #endif
 202 #endif /* CONFIG_SPL_BUILD */
 203
 204 /*
 205  * Set a new environment variable,
 206  * or replace or delete an existing one.
 207  */
 208 static int _do_env_set(int flag, int argc, char * const argv[])
 209 {
 210         int   i, len;
 211         char  *name, *value, *s;
 212         ENTRY e, *ep;
 213         int env_flag = H_INTERACTIVE;
 214
 215         debug("Initial value for argc=%d\n", argc);
 216         while (argc > 1 && **(argv + 1) == '-') {
 217                 char *arg = *++argv;
 218
 219                 --argc;
 220                 while (*++arg) {
 221                         switch (*arg) {
 222                         case 'f':               /* force */
 223                                 env_flag |= H_FORCE;
 224                                 break;
 225                         default:
 226                                 return CMD_RET_USAGE;
 227                         }
 228                 }
 229         }
 230         debug("Final value for argc=%d\n", argc);
 231         name = argv[1];
 232         value = argv[2];
 233
 234         if (strchr(name, '=')) {
 235                 printf("## Error: illegal character '='"
 236                        "in variable name \"%s\"\n", name);
 237                 return 1;
 238         }
 239
 240         env_id++;
 241
 242         /* Delete only ? */
 243         if (argc < 3 || argv[2] == NULL) {
 244                 int rc = hdelete_r(name, &env_htab, env_flag);
 245                 return !rc;
 246         }
 247
 248         /*
 249          * Insert / replace new value
 250          */
 251         for (i = 2, len = 0; i < argc; ++i)
 252                 len += strlen(argv[i]) + 1;
 253
 254         value = malloc(len);
 255         if (value == NULL) {
 256                 printf("## Can't malloc %d bytes\n", len);
 257                 return 1;
 258         }
 259         for (i = 2, s = value; i < argc; ++i) {
 260                 char *v = argv[i];
 261
 262                 while ((*s++ = *v++) != '\0')
 263                         ;
 264                 *(s - 1) = ' ';
 265         }
 266         if (s != value)
 267                 *--s = '\0';
 268
 269         e.key   = name;
 270         e.data  = value;
 271         hsearch_r(e, ENTER, &ep, &env_htab, env_flag);
 272         free(value);
 273         if (!ep) {
 274                 printf("## Error inserting \"%s\" variable, errno=%d\n",
 275                         name, errno);
 276                 return 1;
 277         }
 278
 279         return 0;
 280 }
 281
 282 int setenv(const char *varname, const char *varvalue)
 283 {
 284         const char * const argv[4] = { "setenv", varname, varvalue, NULL };
 285
 286         /* before import into hashtable */
 287         if (!(gd->flags & GD_FLG_ENV_READY))
 288                 return 1;
 289
 290         if (varvalue == NULL || varvalue[0] == '\0')
 291                 return _do_env_set(0, 2, (char * const *)argv);
 292         else
 293                 return _do_env_set(0, 3, (char * const *)argv);
 294 }
 295
 296 /**
 297  * Set an environment variable to an integer value
 298  *
 299  * @param varname       Environment variable to set
 300  * @param value         Value to set it to
 301  * @return 0 if ok, 1 on error
 302  */
 303 int setenv_ulong(const char *varname, ulong value)
 304 {
 305         /* TODO: this should be unsigned */
 306         char *str = simple_itoa(value);
 307
 308         return setenv(varname, str);
 309 }
 310
 311 /**
 312  * Set an environment variable to an value in hex
 313  *
 314  * @param varname       Environment variable to set
 315  * @param value         Value to set it to
 316  * @return 0 if ok, 1 on error
 317  */
 318 int setenv_hex(const char *varname, ulong value)
 319 {
 320         char str[17];
 321
 322         sprintf(str, "%lx", value);
 323         return setenv(varname, str);
 324 }
 325
 326 ulong getenv_hex(const char *varname, ulong default_val)
 327 {
 328         const char *s;
 329         ulong value;
 330         char *endp;
 331
 332         s = getenv(varname);
 333         if (s)
 334                 value = simple_strtoul(s, &endp, 16);
 335         if (!s || endp == s)
 336                 return default_val;
 337
 338         return value;
 339 }
 340
 341 #ifndef CONFIG_SPL_BUILD
 342 static int do_env_set(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 343 {
 344         if (argc < 2)
 345                 return CMD_RET_USAGE;
 346
 347         return _do_env_set(flag, argc, argv);
 348 }
 349
 350 /*
 351  * Prompt for environment variable
 352  */
 353 #if defined(CONFIG_CMD_ASKENV)
 354 int do_env_ask(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 355 {
 356         char message[CONFIG_SYS_CBSIZE];
 357         int i, len, pos, size;
 358         char *local_args[4];
 359         char *endptr;
 360
 361         local_args[0] = argv[0];
 362         local_args[1] = argv[1];
 363         local_args[2] = NULL;
 364         local_args[3] = NULL;
 365
 366         /*
 367          * Check the syntax:
 368          *
 369          * env_ask envname [message1 ...] [size]
 370          */
 371         if (argc == 1)
 372                 return CMD_RET_USAGE;
 373
 374         /*
 375          * We test the last argument if it can be converted
 376          * into a decimal number.  If yes, we assume it's
 377          * the size.  Otherwise we echo it as part of the
 378          * message.
 379          */
 380         i = simple_strtoul(argv[argc - 1], &endptr, 10);
 381         if (*endptr != '\0') {                  /* no size */
 382                 size = CONFIG_SYS_CBSIZE - 1;
 383         } else {                                /* size given */
 384                 size = i;
 385                 --argc;
 386         }
 387
 388         if (argc <= 2) {
 389                 sprintf(message, "Please enter '%s': ", argv[1]);
 390         } else {
 391                 /* env_ask envname message1 ... messagen [size] */
 392                 for (i = 2, pos = 0; i < argc; i++) {
 393                         if (pos)
 394                                 message[pos++] = ' ';
 395
 396                         strcpy(message + pos, argv[i]);
 397                         pos += strlen(argv[i]);
 398                 }
 399                 message[pos++] = ' ';
 400                 message[pos] = '\0';
 401         }
 402
 403         if (size >= CONFIG_SYS_CBSIZE)
 404                 size = CONFIG_SYS_CBSIZE - 1;
 405
 406         if (size <= 0)
 407                 return 1;
 408
 409         /* prompt for input */
 410         len = readline(message);
 411
 412         if (size < len)
 413                 console_buffer[size] = '\0';
 414
 415         len = 2;
 416         if (console_buffer[0] != '\0') {
 417                 local_args[2] = console_buffer;
 418                 len = 3;
 419         }
 420
 421         /* Continue calling setenv code */
 422         return _do_env_set(flag, len, local_args);
 423 }
 424 #endif
 425
 426 #if defined(CONFIG_CMD_ENV_CALLBACK)
 427 static int print_static_binding(const char *var_name, const char *callback_name)
 428 {
 429         printf("\t%-20s %-20s\n", var_name, callback_name);
 430
 431         return 0;
 432 }
 433
 434 static int print_active_callback(ENTRY *entry)
 435 {
 436         struct env_clbk_tbl *clbkp;
 437         int i;
 438         int num_callbacks;
 439
 440         if (entry->callback == NULL)
 441                 return 0;
 442
 443         /* look up the callback in the linker-list */
 444         num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
 445         for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
 446              i < num_callbacks;
 447              i++, clbkp++) {
 448 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 449                 if (entry->callback == clbkp->callback + gd->reloc_off)
 450 #else
 451                 if (entry->callback == clbkp->callback)
 452 #endif
 453                         break;
 454         }
 455
 456         if (i == num_callbacks)
 457                 /* this should probably never happen, but just in case... */
 458                 printf("\t%-20s %p\n", entry->key, entry->callback);
 459         else
 460                 printf("\t%-20s %-20s\n", entry->key, clbkp->name);
 461
 462         return 0;
 463 }
 464
 465 /*
 466  * Print the callbacks available and what they are bound to
 467  */
 468 int do_env_callback(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 469 {
 470         struct env_clbk_tbl *clbkp;
 471         int i;
 472         int num_callbacks;
 473
 474         /* Print the available callbacks */
 475         puts("Available callbacks:\n");
 476         puts("\tCallback Name\n");
 477         puts("\t-------------\n");
 478         num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
 479         for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
 480              i < num_callbacks;
 481              i++, clbkp++)
 482                 printf("\t%s\n", clbkp->name);
 483         puts("\n");
 484
 485         /* Print the static bindings that may exist */
 486         puts("Static callback bindings:\n");
 487         printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
 488         printf("\t%-20s %-20s\n", "-------------", "-------------");
 489         env_attr_walk(ENV_CALLBACK_LIST_STATIC, print_static_binding);
 490         puts("\n");
 491
 492         /* walk through each variable and print the callback if it has one */
 493         puts("Active callback bindings:\n");
 494         printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
 495         printf("\t%-20s %-20s\n", "-------------", "-------------");
 496         hwalk_r(&env_htab, print_active_callback);
 497         return 0;
 498 }
 499 #endif
 500
 501 #if defined(CONFIG_CMD_ENV_FLAGS)
 502 static int print_static_flags(const char *var_name, const char *flags)
 503 {
 504         enum env_flags_vartype type = env_flags_parse_vartype(flags);
 505         enum env_flags_varaccess access = env_flags_parse_varaccess(flags);
 506
 507         printf("\t%-20s %-20s %-20s\n", var_name,
 508                 env_flags_get_vartype_name(type),
 509                 env_flags_get_varaccess_name(access));
 510
 511         return 0;
 512 }
 513
 514 static int print_active_flags(ENTRY *entry)
 515 {
 516         enum env_flags_vartype type;
 517         enum env_flags_varaccess access;
 518
 519         if (entry->flags == 0)
 520                 return 0;
 521
 522         type = (enum env_flags_vartype)
 523                 (entry->flags & ENV_FLAGS_VARTYPE_BIN_MASK);
 524         access = env_flags_parse_varaccess_from_binflags(entry->flags);
 525         printf("\t%-20s %-20s %-20s\n", entry->key,
 526                 env_flags_get_vartype_name(type),
 527                 env_flags_get_varaccess_name(access));
 528
 529         return 0;
 530 }
 531
 532 /*
 533  * Print the flags available and what variables have flags
 534  */
 535 int do_env_flags(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 536 {
 537         /* Print the available variable types */
 538         printf("Available variable type flags (position %d):\n",
 539                 ENV_FLAGS_VARTYPE_LOC);
 540         puts("\tFlag\tVariable Type Name\n");
 541         puts("\t----\t------------------\n");
 542         env_flags_print_vartypes();
 543         puts("\n");
 544
 545         /* Print the available variable access types */
 546         printf("Available variable access flags (position %d):\n",
 547                 ENV_FLAGS_VARACCESS_LOC);
 548         puts("\tFlag\tVariable Access Name\n");
 549         puts("\t----\t--------------------\n");
 550         env_flags_print_varaccess();
 551         puts("\n");
 552
 553         /* Print the static flags that may exist */
 554         puts("Static flags:\n");
 555         printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
 556                 "Variable Access");
 557         printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
 558                 "---------------");
 559         env_attr_walk(ENV_FLAGS_LIST_STATIC, print_static_flags);
 560         puts("\n");
 561
 562         /* walk through each variable and print the flags if non-default */
 563         puts("Active flags:\n");
 564         printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
 565                 "Variable Access");
 566         printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
 567                 "---------------");
 568         hwalk_r(&env_htab, print_active_flags);
 569         return 0;
 570 }
 571 #endif
 572
 573 /*
 574  * Interactively edit an environment variable
 575  */
 576 #if defined(CONFIG_CMD_EDITENV)
 577 static int do_env_edit(cmd_tbl_t *cmdtp, int flag, int argc,
 578                        char * const argv[])
 579 {
 580         char buffer[CONFIG_SYS_CBSIZE];
 581         char *init_val;
 582
 583         if (argc < 2)
 584                 return CMD_RET_USAGE;
 585
 586         /* Set read buffer to initial value or empty sting */
 587         init_val = getenv(argv[1]);
 588         if (init_val)
 589                 sprintf(buffer, "%s", init_val);
 590         else
 591                 buffer[0] = '\0';
 592
 593         if (readline_into_buffer("edit: ", buffer, 0) < 0)
 594                 return 1;
 595
 596         return setenv(argv[1], buffer);
 597 }
 598 #endif /* CONFIG_CMD_EDITENV */
 599 #endif /* CONFIG_SPL_BUILD */
 600
 601 /*
 602  * Look up variable from environment,
 603  * return address of storage for that variable,
 604  * or NULL if not found
 605  */
 606 char *getenv(const char *name)
 607 {
 608         if (gd->flags & GD_FLG_ENV_READY) { /* after import into hashtable */
 609                 ENTRY e, *ep;
 610
 611                 WATCHDOG_RESET();
 612
 613                 e.key   = name;
 614                 e.data  = NULL;
 615                 hsearch_r(e, FIND, &ep, &env_htab, 0);
 616
 617                 return ep ? ep->data : NULL;
 618         }
 619
 620         /* restricted capabilities before import */
 621         if (getenv_f(name, (char *)(gd->env_buf), sizeof(gd->env_buf)) > 0)
 622                 return (char *)(gd->env_buf);
 623
 624         return NULL;
 625 }
 626
 627 /*
 628  * Look up variable from environment for restricted C runtime env.
 629  */
 630 int getenv_f(const char *name, char *buf, unsigned len)
 631 {
 632         int i, nxt;
 633
 634         for (i = 0; env_get_char(i) != '\0'; i = nxt + 1) {
 635                 int val, n;
 636
 637                 for (nxt = i; env_get_char(nxt) != '\0'; ++nxt) {
 638                         if (nxt >= CONFIG_ENV_SIZE)
 639                                 return -1;
 640                 }
 641
 642                 val = envmatch((uchar *)name, i);
 643                 if (val < 0)
 644                         continue;
 645
 646                 /* found; copy out */
 647                 for (n = 0; n < len; ++n, ++buf) {
 648                         *buf = env_get_char(val++);
 649                         if (*buf == '\0')
 650                                 return n;
 651                 }
 652
 653                 if (n)
 654                         *--buf = '\0';
 655
 656                 printf("env_buf [%d bytes] too small for value of \"%s\"\n",
 657                         len, name);
 658
 659                 return n;
 660         }
 661
 662         return -1;
 663 }
 664
 665 /**
 666  * Decode the integer value of an environment variable and return it.
 667  *
 668  * @param name          Name of environemnt variable
 669  * @param base          Number base to use (normally 10, or 16 for hex)
 670  * @param default_val   Default value to return if the variable is not
 671  *                      found
 672  * @return the decoded value, or default_val if not found
 673  */
 674 ulong getenv_ulong(const char *name, int base, ulong default_val)
 675 {
 676         /*
 677          * We can use getenv() here, even before relocation, since the
 678          * environment variable value is an integer and thus short.
 679          */
 680         const char *str = getenv(name);
 681
 682         return str ? simple_strtoul(str, NULL, base) : default_val;
 683 }
 684
 685 #ifndef CONFIG_SPL_BUILD
 686 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
 687 static int do_env_save(cmd_tbl_t *cmdtp, int flag, int argc,
 688                        char * const argv[])
 689 {
 690         printf("Saving Environment to %s...\n", env_name_spec);
 691
 692         return saveenv() ? 1 : 0;
 693 }
 694
 695 U_BOOT_CMD(
 696         saveenv, 1, 0,  do_env_save,
 697         "save environment variables to persistent storage",
 698         ""
 699 );
 700 #endif
 701 #endif /* CONFIG_SPL_BUILD */
 702
 703
 704 /*
 705  * Match a name / name=value pair
 706  *
 707  * s1 is either a simple 'name', or a 'name=value' pair.
 708  * i2 is the environment index for a 'name2=value2' pair.
 709  * If the names match, return the index for the value2, else -1.
 710  */
 711 int envmatch(uchar *s1, int i2)
 712 {
 713         if (s1 == NULL)
 714                 return -1;
 715
 716         while (*s1 == env_get_char(i2++))
 717                 if (*s1++ == '=')
 718                         return i2;
 719
 720         if (*s1 == '\0' && env_get_char(i2-1) == '=')
 721                 return i2;
 722
 723         return -1;
 724 }
 725
 726 #ifndef CONFIG_SPL_BUILD
 727 static int do_env_default(cmd_tbl_t *cmdtp, int __flag,
 728                           int argc, char * const argv[])
 729 {
 730         int all = 0, flag = 0;
 731
 732         debug("Initial value for argc=%d\n", argc);
 733         while (--argc > 0 && **++argv == '-') {
 734                 char *arg = *argv;
 735
 736                 while (*++arg) {
 737                         switch (*arg) {
 738                         case 'a':               /* default all */
 739                                 all = 1;
 740                                 break;
 741                         case 'f':               /* force */
 742                                 flag |= H_FORCE;
 743                                 break;
 744                         default:
 745                                 return cmd_usage(cmdtp);
 746                         }
 747                 }
 748         }
 749         debug("Final value for argc=%d\n", argc);
 750         if (all && (argc == 0)) {
 751                 /* Reset the whole environment */
 752                 set_default_env("## Resetting to default environment\n");
 753                 return 0;
 754         }
 755         if (!all && (argc > 0)) {
 756                 /* Reset individual variables */
 757                 set_default_vars(argc, argv);
 758                 return 0;
 759         }
 760
 761         return cmd_usage(cmdtp);
 762 }
 763
 764 static int do_env_delete(cmd_tbl_t *cmdtp, int flag,
 765                          int argc, char * const argv[])
 766 {
 767         int env_flag = H_INTERACTIVE;
 768         int ret = 0;
 769
 770         debug("Initial value for argc=%d\n", argc);
 771         while (argc > 1 && **(argv + 1) == '-') {
 772                 char *arg = *++argv;
 773
 774                 --argc;
 775                 while (*++arg) {
 776                         switch (*arg) {
 777                         case 'f':               /* force */
 778                                 env_flag |= H_FORCE;
 779                                 break;
 780                         default:
 781                                 return CMD_RET_USAGE;
 782                         }
 783                 }
 784         }
 785         debug("Final value for argc=%d\n", argc);
 786
 787         env_id++;
 788
 789         while (--argc > 0) {
 790                 char *name = *++argv;
 791
 792                 if (!hdelete_r(name, &env_htab, env_flag))
 793                         ret = 1;
 794         }
 795
 796         return ret;
 797 }
 798
 799 #ifdef CONFIG_CMD_EXPORTENV
 800 /*
 801  * env export [-t | -b | -c] [-s size] addr [var ...]
 802  *      -t:     export as text format; if size is given, data will be
 803  *              padded with '\0' bytes; if not, one terminating '\0'
 804  *              will be added (which is included in the "filesize"
 805  *              setting so you can for exmple copy this to flash and
 806  *              keep the termination).
 807  *      -b:     export as binary format (name=value pairs separated by
 808  *              '\0', list end marked by double "\0\0")
 809  *      -c:     export as checksum protected environment format as
 810  *              used for example by "saveenv" command
 811  *      -s size:
 812  *              size of output buffer
 813  *      addr:   memory address where environment gets stored
 814  *      var...  List of variable names that get included into the
 815  *              export. Without arguments, the whole environment gets
 816  *              exported.
 817  *
 818  * With "-c" and size is NOT given, then the export command will
 819  * format the data as currently used for the persistent storage,
 820  * i. e. it will use CONFIG_ENV_SECT_SIZE as output block size and
 821  * prepend a valid CRC32 checksum and, in case of resundant
 822  * environment, a "current" redundancy flag. If size is given, this
 823  * value will be used instead of CONFIG_ENV_SECT_SIZE; again, CRC32
 824  * checksum and redundancy flag will be inserted.
 825  *
 826  * With "-b" and "-t", always only the real data (including a
 827  * terminating '\0' byte) will be written; here the optional size
 828  * argument will be used to make sure not to overflow the user
 829  * provided buffer; the command will abort if the size is not
 830  * sufficient. Any remainign space will be '\0' padded.
 831  *
 832  * On successful return, the variable "filesize" will be set.
 833  * Note that filesize includes the trailing/terminating '\0' byte(s).
 834  *
 835  * Usage szenario:  create a text snapshot/backup of the current settings:
 836  *
 837  *      => env export -t 100000
 838  *      => era ${backup_addr} +${filesize}
 839  *      => cp.b 100000 ${backup_addr} ${filesize}
 840  *
 841  * Re-import this snapshot, deleting all other settings:
 842  *
 843  *      => env import -d -t ${backup_addr}
 844  */
 845 static int do_env_export(cmd_tbl_t *cmdtp, int flag,
 846                          int argc, char * const argv[])
 847 {
 848         char    buf[32];
 849         char    *addr, *cmd, *res;
 850         size_t  size = 0;
 851         ssize_t len;
 852         env_t   *envp;
 853         char    sep = '\n';
 854         int     chk = 0;
 855         int     fmt = 0;
 856
 857         cmd = *argv;
 858
 859         while (--argc > 0 && **++argv == '-') {
 860                 char *arg = *argv;
 861                 while (*++arg) {
 862                         switch (*arg) {
 863                         case 'b':               /* raw binary format */
 864                                 if (fmt++)
 865                                         goto sep_err;
 866                                 sep = '\0';
 867                                 break;
 868                         case 'c':               /* external checksum format */
 869                                 if (fmt++)
 870                                         goto sep_err;
 871                                 sep = '\0';
 872                                 chk = 1;
 873                                 break;
 874                         case 's':               /* size given */
 875                                 if (--argc <= 0)
 876                                         return cmd_usage(cmdtp);
 877                                 size = simple_strtoul(*++argv, NULL, 16);
 878                                 goto NXTARG;
 879                         case 't':               /* text format */
 880                                 if (fmt++)
 881                                         goto sep_err;
 882                                 sep = '\n';
 883                                 break;
 884                         default:
 885                                 return CMD_RET_USAGE;
 886                         }
 887                 }
 888 NXTARG:         ;
 889         }
 890
 891         if (argc < 1)
 892                 return CMD_RET_USAGE;
 893
 894         addr = (char *)simple_strtoul(argv[0], NULL, 16);
 895
 896         if (size)
 897                 memset(addr, '\0', size);
 898
 899         argc--;
 900         argv++;
 901
 902         if (sep) {              /* export as text file */
 903                 len = hexport_r(&env_htab, sep,
 904                                 H_MATCH_KEY | H_MATCH_IDENT,
 905                                 &addr, size, argc, argv);
 906                 if (len < 0) {
 907                         error("Cannot export environment: errno = %d\n", errno);
 908                         return 1;
 909                 }
 910                 sprintf(buf, "%zX", (size_t)len);
 911                 setenv("filesize", buf);
 912
 913                 return 0;
 914         }
 915
 916         envp = (env_t *)addr;
 917
 918         if (chk)                /* export as checksum protected block */
 919                 res = (char *)envp->data;
 920         else                    /* export as raw binary data */
 921                 res = addr;
 922
 923         len = hexport_r(&env_htab, '\0',
 924                         H_MATCH_KEY | H_MATCH_IDENT,
 925                         &res, ENV_SIZE, argc, argv);
 926         if (len < 0) {
 927                 error("Cannot export environment: errno = %d\n", errno);
 928                 return 1;
 929         }
 930
 931         if (chk) {
 932                 envp->crc = crc32(0, envp->data, ENV_SIZE);
 933 #ifdef CONFIG_ENV_ADDR_REDUND
 934                 envp->flags = ACTIVE_FLAG;
 935 #endif
 936         }
 937         setenv_hex("filesize", len + offsetof(env_t, data));
 938
 939         return 0;
 940
 941 sep_err:
 942         printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n", cmd);
 943         return 1;
 944 }
 945 #endif
 946
 947 #ifdef CONFIG_CMD_IMPORTENV
 948 /*
 949  * env import [-d] [-t | -b | -c] addr [size]
 950  *      -d:     delete existing environment before importing;
 951  *              otherwise overwrite / append to existion definitions
 952  *      -t:     assume text format; either "size" must be given or the
 953  *              text data must be '\0' terminated
 954  *      -b:     assume binary format ('\0' separated, "\0\0" terminated)
 955  *      -c:     assume checksum protected environment format
 956  *      addr:   memory address to read from
 957  *      size:   length of input data; if missing, proper '\0'
 958  *              termination is mandatory
 959  */
 960 static int do_env_import(cmd_tbl_t *cmdtp, int flag,
 961                          int argc, char * const argv[])
 962 {
 963         char    *cmd, *addr;
 964         char    sep = '\n';
 965         int     chk = 0;
 966         int     fmt = 0;
 967         int     del = 0;
 968         size_t  size;
 969
 970         cmd = *argv;
 971
 972         while (--argc > 0 && **++argv == '-') {
 973                 char *arg = *argv;
 974                 while (*++arg) {
 975                         switch (*arg) {
 976                         case 'b':               /* raw binary format */
 977                                 if (fmt++)
 978                                         goto sep_err;
 979                                 sep = '\0';
 980                                 break;
 981                         case 'c':               /* external checksum format */
 982                                 if (fmt++)
 983                                         goto sep_err;
 984                                 sep = '\0';
 985                                 chk = 1;
 986                                 break;
 987                         case 't':               /* text format */
 988                                 if (fmt++)
 989                                         goto sep_err;
 990                                 sep = '\n';
 991                                 break;
 992                         case 'd':
 993                                 del = 1;
 994                                 break;
 995                         default:
 996                                 return CMD_RET_USAGE;
 997                         }
 998                 }
 999         }
1000
1001         if (argc < 1)
1002                 return CMD_RET_USAGE;
1003
1004         if (!fmt)
1005                 printf("## Warning: defaulting to text format\n");
1006
1007         addr = (char *)simple_strtoul(argv[0], NULL, 16);
1008
1009         if (argc == 2) {
1010                 size = simple_strtoul(argv[1], NULL, 16);
1011         } else if (argc == 1 && chk) {
1012                 puts("## Error: external checksum format must pass size\n");
1013                 return CMD_RET_FAILURE;
1014         } else {
1015                 char *s = addr;
1016
1017                 size = 0;
1018
1019                 while (size < MAX_ENV_SIZE) {
1020                         if ((*s == sep) && (*(s+1) == '\0'))
1021                                 break;
1022                         ++s;
1023                         ++size;
1024                 }
1025                 if (size == MAX_ENV_SIZE) {
1026                         printf("## Warning: Input data exceeds %d bytes"
1027                                 " - truncated\n", MAX_ENV_SIZE);
1028                 }
1029                 size += 2;
1030                 printf("## Info: input data size = %zu = 0x%zX\n", size, size);
1031         }
1032
1033         if (chk) {
1034                 uint32_t crc;
1035                 env_t *ep = (env_t *)addr;
1036
1037                 size -= offsetof(env_t, data);
1038                 memcpy(&crc, &ep->crc, sizeof(crc));
1039
1040                 if (crc32(0, ep->data, size) != crc) {
1041                         puts("## Error: bad CRC, import failed\n");
1042                         return 1;
1043                 }
1044                 addr = (char *)ep->data;
1045         }
1046
1047         if (himport_r(&env_htab, addr, size, sep, del ? 0 : H_NOCLEAR,
1048                         0, NULL) == 0) {
1049                 error("Environment import failed: errno = %d\n", errno);
1050                 return 1;
1051         }
1052         gd->flags |= GD_FLG_ENV_READY;
1053
1054         return 0;
1055
1056 sep_err:
1057         printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",
1058                 cmd);
1059         return 1;
1060 }
1061 #endif
1062
1063 #if defined(CONFIG_CMD_ENV_EXISTS)
1064 static int do_env_exists(cmd_tbl_t *cmdtp, int flag, int argc,
1065                        char * const argv[])
1066 {
1067         ENTRY e, *ep;
1068
1069         if (argc < 2)
1070                 return CMD_RET_USAGE;
1071
1072         e.key = argv[1];
1073         e.data = NULL;
1074         hsearch_r(e, FIND, &ep, &env_htab, 0);
1075
1076         return (ep == NULL) ? 1 : 0;
1077 }
1078 #endif
1079
1080 /*
1081  * New command line interface: "env" command with subcommands
1082  */
1083 static cmd_tbl_t cmd_env_sub[] = {
1084 #if defined(CONFIG_CMD_ASKENV)
1085         U_BOOT_CMD_MKENT(ask, CONFIG_SYS_MAXARGS, 1, do_env_ask, "", ""),
1086 #endif
1087         U_BOOT_CMD_MKENT(default, 1, 0, do_env_default, "", ""),
1088         U_BOOT_CMD_MKENT(delete, CONFIG_SYS_MAXARGS, 0, do_env_delete, "", ""),
1089 #if defined(CONFIG_CMD_EDITENV)
1090         U_BOOT_CMD_MKENT(edit, 2, 0, do_env_edit, "", ""),
1091 #endif
1092 #if defined(CONFIG_CMD_ENV_CALLBACK)
1093         U_BOOT_CMD_MKENT(callbacks, 1, 0, do_env_callback, "", ""),
1094 #endif
1095 #if defined(CONFIG_CMD_ENV_FLAGS)
1096         U_BOOT_CMD_MKENT(flags, 1, 0, do_env_flags, "", ""),
1097 #endif
1098 #if defined(CONFIG_CMD_EXPORTENV)
1099         U_BOOT_CMD_MKENT(export, 4, 0, do_env_export, "", ""),
1100 #endif
1101 #if defined(CONFIG_CMD_GREPENV)
1102         U_BOOT_CMD_MKENT(grep, CONFIG_SYS_MAXARGS, 1, do_env_grep, "", ""),
1103 #endif
1104 #if defined(CONFIG_CMD_IMPORTENV)
1105         U_BOOT_CMD_MKENT(import, 5, 0, do_env_import, "", ""),
1106 #endif
1107         U_BOOT_CMD_MKENT(print, CONFIG_SYS_MAXARGS, 1, do_env_print, "", ""),
1108 #if defined(CONFIG_CMD_RUN)
1109         U_BOOT_CMD_MKENT(run, CONFIG_SYS_MAXARGS, 1, do_run, "", ""),
1110 #endif
1111 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1112         U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
1113 #endif
1114         U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
1115 #if defined(CONFIG_CMD_ENV_EXISTS)
1116         U_BOOT_CMD_MKENT(exists, 2, 0, do_env_exists, "", ""),
1117 #endif
1118 };
1119
1120 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
1121 void env_reloc(void)
1122 {
1123         fixup_cmdtable(cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1124 }
1125 #endif
1126
1127 static int do_env(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
1128 {
1129         cmd_tbl_t *cp;
1130
1131         if (argc < 2)
1132                 return CMD_RET_USAGE;
1133
1134         /* drop initial "env" arg */
1135         argc--;
1136         argv++;
1137
1138         cp = find_cmd_tbl(argv[0], cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1139
1140         if (cp)
1141                 return cp->cmd(cmdtp, flag, argc, argv);
1142
1143         return CMD_RET_USAGE;
1144 }
1145
1146 #ifdef CONFIG_SYS_LONGHELP
1147 static char env_help_text[] =
1148 #if defined(CONFIG_CMD_ASKENV)
1149         "ask name [message] [size] - ask for environment variable\nenv "
1150 #endif
1151 #if defined(CONFIG_CMD_ENV_CALLBACK)
1152         "callbacks - print callbacks and their associated variables\nenv "
1153 #endif
1154         "default [-f] -a - [forcibly] reset default environment\n"
1155         "env default [-f] var [...] - [forcibly] reset variable(s) to their default values\n"
1156         "env delete [-f] var [...] - [forcibly] delete variable(s)\n"
1157 #if defined(CONFIG_CMD_EDITENV)
1158         "env edit name - edit environment variable\n"
1159 #endif
1160 #if defined(CONFIG_CMD_ENV_EXISTS)
1161         "env exists name - tests for existence of variable\n"
1162 #endif
1163 #if defined(CONFIG_CMD_EXPORTENV)
1164         "env export [-t | -b | -c] [-s size] addr [var ...] - export environment\n"
1165 #endif
1166 #if defined(CONFIG_CMD_ENV_FLAGS)
1167         "env flags - print variables that have non-default flags\n"
1168 #endif
1169 #if defined(CONFIG_CMD_GREPENV)
1170 #ifdef CONFIG_REGEX
1171         "env grep [-e] [-n | -v | -b] string [...] - search environment\n"
1172 #else
1173         "env grep [-n | -v | -b] string [...] - search environment\n"
1174 #endif
1175 #endif
1176 #if defined(CONFIG_CMD_IMPORTENV)
1177         "env import [-d] [-t | -b | -c] addr [size] - import environment\n"
1178 #endif
1179         "env print [-a | name ...] - print environment\n"
1180 #if defined(CONFIG_CMD_RUN)
1181         "env run var [...] - run commands in an environment variable\n"
1182 #endif
1183 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1184         "env save - save environment\n"
1185 #endif
1186         "env set [-f] name [arg ...]\n";
1187 #endif
1188
1189 U_BOOT_CMD(
1190         env, CONFIG_SYS_MAXARGS, 1, do_env,
1191         "environment handling commands", env_help_text
1192 );
1193
1194 /*
1195  * Old command line interface, kept for compatibility
1196  */
1197
1198 #if defined(CONFIG_CMD_EDITENV)
1199 U_BOOT_CMD_COMPLETE(
1200         editenv, 2, 0,  do_env_edit,
1201         "edit environment variable",
1202         "name\n"
1203         "    - edit environment variable 'name'",
1204         var_complete
1205 );
1206 #endif
1207
1208 U_BOOT_CMD_COMPLETE(
1209         printenv, CONFIG_SYS_MAXARGS, 1,        do_env_print,
1210         "print environment variables",
1211         "[-a]\n    - print [all] values of all environment variables\n"
1212         "printenv name ...\n"
1213         "    - print value of environment variable 'name'",
1214         var_complete
1215 );
1216
1217 #ifdef CONFIG_CMD_GREPENV
1218 U_BOOT_CMD_COMPLETE(
1219         grepenv, CONFIG_SYS_MAXARGS, 0,  do_env_grep,
1220         "search environment variables",
1221 #ifdef CONFIG_REGEX
1222         "[-e] [-n | -v | -b] string ...\n"
1223 #else
1224         "[-n | -v | -b] string ...\n"
1225 #endif
1226         "    - list environment name=value pairs matching 'string'\n"
1227 #ifdef CONFIG_REGEX
1228         "      \"-e\": enable regular expressions;\n"
1229 #endif
1230         "      \"-n\": search variable names; \"-v\": search values;\n"
1231         "      \"-b\": search both names and values (default)",
1232         var_complete
1233 );
1234 #endif
1235
1236 U_BOOT_CMD_COMPLETE(
1237         setenv, CONFIG_SYS_MAXARGS, 0,  do_env_set,
1238         "set environment variables",
1239         "[-f] name value ...\n"
1240         "    - [forcibly] set environment variable 'name' to 'value ...'\n"
1241         "setenv [-f] name\n"
1242         "    - [forcibly] delete environment variable 'name'",
1243         var_complete
1244 );
1245
1246 #if defined(CONFIG_CMD_ASKENV)
1247
1248 U_BOOT_CMD(
1249         askenv, CONFIG_SYS_MAXARGS,     1,      do_env_ask,
1250         "get environment variables from stdin",
1251         "name [message] [size]\n"
1252         "    - get environment variable 'name' from stdin (max 'size' chars)"
1253 );
1254 #endif
1255
1256 #if defined(CONFIG_CMD_RUN)
1257 U_BOOT_CMD_COMPLETE(
1258         run,    CONFIG_SYS_MAXARGS,     1,      do_run,
1259         "run commands in an environment variable",
1260         "var [...]\n"
1261         "    - run the commands in the environment variable(s) 'var'",
1262         var_complete
1263 );
1264 #endif
1265 #endif /* CONFIG_SPL_BUILD */