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 <cli.h>
  29 #include <command.h>
  30 #include <console.h>
  31 #include <environment.h>
  32 #include <search.h>
  33 #include <errno.h>
  34 #include <malloc.h>
  35 #include <mapmem.h>
  36 #include <watchdog.h>
  37 #include <linux/stddef.h>
  38 #include <asm/byteorder.h>
  39 #include <asm/io.h>
  40
  41 DECLARE_GLOBAL_DATA_PTR;
  42
  43 #if     !defined(CONFIG_ENV_IS_IN_EEPROM)       && \
  44         !defined(CONFIG_ENV_IS_IN_FLASH)        && \
  45         !defined(CONFIG_ENV_IS_IN_DATAFLASH)    && \
  46         !defined(CONFIG_ENV_IS_IN_MMC)          && \
  47         !defined(CONFIG_ENV_IS_IN_FAT)          && \
  48         !defined(CONFIG_ENV_IS_IN_NAND)         && \
  49         !defined(CONFIG_ENV_IS_IN_NVRAM)        && \
  50         !defined(CONFIG_ENV_IS_IN_ONENAND)      && \
  51         !defined(CONFIG_ENV_IS_IN_SPI_FLASH)    && \
  52         !defined(CONFIG_ENV_IS_IN_REMOTE)       && \
  53         !defined(CONFIG_ENV_IS_IN_UBI)          && \
  54         !defined(CONFIG_ENV_IS_NOWHERE)
  55 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|DATAFLASH|ONENAND|\
  56 SPI_FLASH|NVRAM|MMC|FAT|REMOTE|UBI} or CONFIG_ENV_IS_NOWHERE
  57 #endif
  58
  59 /*
  60  * Maximum expected input data size for import command
  61  */
  62 #define MAX_ENV_SIZE    (1 << 20)       /* 1 MiB */
  63
  64 /*
  65  * This variable is incremented on each do_env_set(), so it can
  66  * be used via get_env_id() as an indication, if the environment
  67  * has changed or not. So it is possible to reread an environment
  68  * variable only if the environment was changed ... done so for
  69  * example in NetInitLoop()
  70  */
  71 static int env_id = 1;
  72
  73 int get_env_id(void)
  74 {
  75         return env_id;
  76 }
  77
  78 #ifndef CONFIG_SPL_BUILD
  79 /*
  80  * Command interface: print one or all environment variables
  81  *
  82  * Returns 0 in case of error, or length of printed string
  83  */
  84 static int env_print(char *name, int flag)
  85 {
  86         char *res = NULL;
  87         ssize_t len;
  88
  89         if (name) {             /* print a single name */
  90                 ENTRY e, *ep;
  91
  92                 e.key = name;
  93                 e.data = NULL;
  94                 hsearch_r(e, FIND, &ep, &env_htab, flag);
  95                 if (ep == NULL)
  96                         return 0;
  97                 len = printf("%s=%s\n", ep->key, ep->data);
  98                 return len;
  99         }
 100
 101         /* print whole list */
 102         len = hexport_r(&env_htab, '\n', flag, &res, 0, 0, NULL);
 103
 104         if (len > 0) {
 105                 puts(res);
 106                 free(res);
 107                 return len;
 108         }
 109
 110         /* should never happen */
 111         printf("## Error: cannot export environment\n");
 112         return 0;
 113 }
 114
 115 static int do_env_print(cmd_tbl_t *cmdtp, int flag, int argc,
 116                         char * const argv[])
 117 {
 118         int i;
 119         int rcode = 0;
 120         int env_flag = H_HIDE_DOT;
 121
 122         if (argc > 1 && argv[1][0] == '-' && argv[1][1] == 'a') {
 123                 argc--;
 124                 argv++;
 125                 env_flag &= ~H_HIDE_DOT;
 126         }
 127
 128         if (argc == 1) {
 129                 /* print all env vars */
 130                 rcode = env_print(NULL, env_flag);
 131                 if (!rcode)
 132                         return 1;
 133                 printf("\nEnvironment size: %d/%ld bytes\n",
 134                         rcode, (ulong)ENV_SIZE);
 135                 return 0;
 136         }
 137
 138         /* print selected env vars */
 139         env_flag &= ~H_HIDE_DOT;
 140         for (i = 1; i < argc; ++i) {
 141                 int rc = env_print(argv[i], env_flag);
 142                 if (!rc) {
 143                         printf("## Error: \"%s\" not defined\n", argv[i]);
 144                         ++rcode;
 145                 }
 146         }
 147
 148         return rcode;
 149 }
 150
 151 #ifdef CONFIG_CMD_GREPENV
 152 static int do_env_grep(cmd_tbl_t *cmdtp, int flag,
 153                        int argc, char * const argv[])
 154 {
 155         char *res = NULL;
 156         int len, grep_how, grep_what;
 157
 158         if (argc < 2)
 159                 return CMD_RET_USAGE;
 160
 161         grep_how  = H_MATCH_SUBSTR;     /* default: substring search    */
 162         grep_what = H_MATCH_BOTH;       /* default: grep names and values */
 163
 164         while (--argc > 0 && **++argv == '-') {
 165                 char *arg = *argv;
 166                 while (*++arg) {
 167                         switch (*arg) {
 168 #ifdef CONFIG_REGEX
 169                         case 'e':               /* use regex matching */
 170                                 grep_how  = H_MATCH_REGEX;
 171                                 break;
 172 #endif
 173                         case 'n':               /* grep for name */
 174                                 grep_what = H_MATCH_KEY;
 175                                 break;
 176                         case 'v':               /* grep for value */
 177                                 grep_what = H_MATCH_DATA;
 178                                 break;
 179                         case 'b':               /* grep for both */
 180                                 grep_what = H_MATCH_BOTH;
 181                                 break;
 182                         case '-':
 183                                 goto DONE;
 184                         default:
 185                                 return CMD_RET_USAGE;
 186                         }
 187                 }
 188         }
 189
 190 DONE:
 191         len = hexport_r(&env_htab, '\n',
 192                         flag | grep_what | grep_how,
 193                         &res, 0, argc, argv);
 194
 195         if (len > 0) {
 196                 puts(res);
 197                 free(res);
 198         }
 199
 200         if (len < 2)
 201                 return 1;
 202
 203         return 0;
 204 }
 205 #endif
 206 #endif /* CONFIG_SPL_BUILD */
 207
 208 /*
 209  * Set a new environment variable,
 210  * or replace or delete an existing one.
 211  */
 212 static int _do_env_set(int flag, int argc, char * const argv[], int env_flag)
 213 {
 214         int   i, len;
 215         char  *name, *value, *s;
 216         ENTRY e, *ep;
 217
 218         debug("Initial value for argc=%d\n", argc);
 219         while (argc > 1 && **(argv + 1) == '-') {
 220                 char *arg = *++argv;
 221
 222                 --argc;
 223                 while (*++arg) {
 224                         switch (*arg) {
 225                         case 'f':               /* force */
 226                                 env_flag |= H_FORCE;
 227                                 break;
 228                         default:
 229                                 return CMD_RET_USAGE;
 230                         }
 231                 }
 232         }
 233         debug("Final value for argc=%d\n", argc);
 234         name = argv[1];
 235         value = argv[2];
 236
 237         if (strchr(name, '=')) {
 238                 printf("## Error: illegal character '='"
 239                        "in variable name \"%s\"\n", name);
 240                 return 1;
 241         }
 242
 243         env_id++;
 244
 245         /* Delete only ? */
 246         if (argc < 3 || argv[2] == NULL) {
 247                 int rc = hdelete_r(name, &env_htab, env_flag);
 248                 return !rc;
 249         }
 250
 251         /*
 252          * Insert / replace new value
 253          */
 254         for (i = 2, len = 0; i < argc; ++i)
 255                 len += strlen(argv[i]) + 1;
 256
 257         value = malloc(len);
 258         if (value == NULL) {
 259                 printf("## Can't malloc %d bytes\n", len);
 260                 return 1;
 261         }
 262         for (i = 2, s = value; i < argc; ++i) {
 263                 char *v = argv[i];
 264
 265                 while ((*s++ = *v++) != '\0')
 266                         ;
 267                 *(s - 1) = ' ';
 268         }
 269         if (s != value)
 270                 *--s = '\0';
 271
 272         e.key   = name;
 273         e.data  = value;
 274         hsearch_r(e, ENTER, &ep, &env_htab, env_flag);
 275         free(value);
 276         if (!ep) {
 277                 printf("## Error inserting \"%s\" variable, errno=%d\n",
 278                         name, errno);
 279                 return 1;
 280         }
 281
 282         return 0;
 283 }
 284
 285 int setenv(const char *varname, const char *varvalue)
 286 {
 287         const char * const argv[4] = { "setenv", varname, varvalue, NULL };
 288
 289         /* before import into hashtable */
 290         if (!(gd->flags & GD_FLG_ENV_READY))
 291                 return 1;
 292
 293         if (varvalue == NULL || varvalue[0] == '\0')
 294                 return _do_env_set(0, 2, (char * const *)argv, H_PROGRAMMATIC);
 295         else
 296                 return _do_env_set(0, 3, (char * const *)argv, H_PROGRAMMATIC);
 297 }
 298
 299 /**
 300  * Set an environment variable to an integer value
 301  *
 302  * @param varname       Environment variable to set
 303  * @param value         Value to set it to
 304  * @return 0 if ok, 1 on error
 305  */
 306 int setenv_ulong(const char *varname, ulong value)
 307 {
 308         /* TODO: this should be unsigned */
 309         char *str = simple_itoa(value);
 310
 311         return setenv(varname, str);
 312 }
 313
 314 /**
 315  * Set an environment variable to an value in hex
 316  *
 317  * @param varname       Environment variable to set
 318  * @param value         Value to set it to
 319  * @return 0 if ok, 1 on error
 320  */
 321 int setenv_hex(const char *varname, ulong value)
 322 {
 323         char str[17];
 324
 325         sprintf(str, "%lx", value);
 326         return setenv(varname, str);
 327 }
 328
 329 ulong getenv_hex(const char *varname, ulong default_val)
 330 {
 331         const char *s;
 332         ulong value;
 333         char *endp;
 334
 335         s = getenv(varname);
 336         if (s)
 337                 value = simple_strtoul(s, &endp, 16);
 338         if (!s || endp == s)
 339                 return default_val;
 340
 341         return value;
 342 }
 343
 344 #ifndef CONFIG_SPL_BUILD
 345 static int do_env_set(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 346 {
 347         if (argc < 2)
 348                 return CMD_RET_USAGE;
 349
 350         return _do_env_set(flag, argc, argv, H_INTERACTIVE);
 351 }
 352
 353 /*
 354  * Prompt for environment variable
 355  */
 356 #if defined(CONFIG_CMD_ASKENV)
 357 int do_env_ask(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 358 {
 359         char message[CONFIG_SYS_CBSIZE];
 360         int i, len, pos, size;
 361         char *local_args[4];
 362         char *endptr;
 363
 364         local_args[0] = argv[0];
 365         local_args[1] = argv[1];
 366         local_args[2] = NULL;
 367         local_args[3] = NULL;
 368
 369         /*
 370          * Check the syntax:
 371          *
 372          * env_ask envname [message1 ...] [size]
 373          */
 374         if (argc == 1)
 375                 return CMD_RET_USAGE;
 376
 377         /*
 378          * We test the last argument if it can be converted
 379          * into a decimal number.  If yes, we assume it's
 380          * the size.  Otherwise we echo it as part of the
 381          * message.
 382          */
 383         i = simple_strtoul(argv[argc - 1], &endptr, 10);
 384         if (*endptr != '\0') {                  /* no size */
 385                 size = CONFIG_SYS_CBSIZE - 1;
 386         } else {                                /* size given */
 387                 size = i;
 388                 --argc;
 389         }
 390
 391         if (argc <= 2) {
 392                 sprintf(message, "Please enter '%s': ", argv[1]);
 393         } else {
 394                 /* env_ask envname message1 ... messagen [size] */
 395                 for (i = 2, pos = 0; i < argc; i++) {
 396                         if (pos)
 397                                 message[pos++] = ' ';
 398
 399                         strcpy(message + pos, argv[i]);
 400                         pos += strlen(argv[i]);
 401                 }
 402                 message[pos++] = ' ';
 403                 message[pos] = '\0';
 404         }
 405
 406         if (size >= CONFIG_SYS_CBSIZE)
 407                 size = CONFIG_SYS_CBSIZE - 1;
 408
 409         if (size <= 0)
 410                 return 1;
 411
 412         /* prompt for input */
 413         len = cli_readline(message);
 414
 415         if (size < len)
 416                 console_buffer[size] = '\0';
 417
 418         len = 2;
 419         if (console_buffer[0] != '\0') {
 420                 local_args[2] = console_buffer;
 421                 len = 3;
 422         }
 423
 424         /* Continue calling setenv code */
 425         return _do_env_set(flag, len, local_args, H_INTERACTIVE);
 426 }
 427 #endif
 428
 429 #if defined(CONFIG_CMD_ENV_CALLBACK)
 430 static int print_static_binding(const char *var_name, const char *callback_name,
 431                                 void *priv)
 432 {
 433         printf("\t%-20s %-20s\n", var_name, callback_name);
 434
 435         return 0;
 436 }
 437
 438 static int print_active_callback(ENTRY *entry)
 439 {
 440         struct env_clbk_tbl *clbkp;
 441         int i;
 442         int num_callbacks;
 443
 444         if (entry->callback == NULL)
 445                 return 0;
 446
 447         /* look up the callback in the linker-list */
 448         num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
 449         for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
 450              i < num_callbacks;
 451              i++, clbkp++) {
 452 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 453                 if (entry->callback == clbkp->callback + gd->reloc_off)
 454 #else
 455                 if (entry->callback == clbkp->callback)
 456 #endif
 457                         break;
 458         }
 459
 460         if (i == num_callbacks)
 461                 /* this should probably never happen, but just in case... */
 462                 printf("\t%-20s %p\n", entry->key, entry->callback);
 463         else
 464                 printf("\t%-20s %-20s\n", entry->key, clbkp->name);
 465
 466         return 0;
 467 }
 468
 469 /*
 470  * Print the callbacks available and what they are bound to
 471  */
 472 int do_env_callback(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 473 {
 474         struct env_clbk_tbl *clbkp;
 475         int i;
 476         int num_callbacks;
 477
 478         /* Print the available callbacks */
 479         puts("Available callbacks:\n");
 480         puts("\tCallback Name\n");
 481         puts("\t-------------\n");
 482         num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
 483         for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
 484              i < num_callbacks;
 485              i++, clbkp++)
 486                 printf("\t%s\n", clbkp->name);
 487         puts("\n");
 488
 489         /* Print the static bindings that may exist */
 490         puts("Static callback bindings:\n");
 491         printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
 492         printf("\t%-20s %-20s\n", "-------------", "-------------");
 493         env_attr_walk(ENV_CALLBACK_LIST_STATIC, print_static_binding, NULL);
 494         puts("\n");
 495
 496         /* walk through each variable and print the callback if it has one */
 497         puts("Active callback bindings:\n");
 498         printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
 499         printf("\t%-20s %-20s\n", "-------------", "-------------");
 500         hwalk_r(&env_htab, print_active_callback);
 501         return 0;
 502 }
 503 #endif
 504
 505 #if defined(CONFIG_CMD_ENV_FLAGS)
 506 static int print_static_flags(const char *var_name, const char *flags,
 507                               void *priv)
 508 {
 509         enum env_flags_vartype type = env_flags_parse_vartype(flags);
 510         enum env_flags_varaccess access = env_flags_parse_varaccess(flags);
 511
 512         printf("\t%-20s %-20s %-20s\n", var_name,
 513                 env_flags_get_vartype_name(type),
 514                 env_flags_get_varaccess_name(access));
 515
 516         return 0;
 517 }
 518
 519 static int print_active_flags(ENTRY *entry)
 520 {
 521         enum env_flags_vartype type;
 522         enum env_flags_varaccess access;
 523
 524         if (entry->flags == 0)
 525                 return 0;
 526
 527         type = (enum env_flags_vartype)
 528                 (entry->flags & ENV_FLAGS_VARTYPE_BIN_MASK);
 529         access = env_flags_parse_varaccess_from_binflags(entry->flags);
 530         printf("\t%-20s %-20s %-20s\n", entry->key,
 531                 env_flags_get_vartype_name(type),
 532                 env_flags_get_varaccess_name(access));
 533
 534         return 0;
 535 }
 536
 537 /*
 538  * Print the flags available and what variables have flags
 539  */
 540 int do_env_flags(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 541 {
 542         /* Print the available variable types */
 543         printf("Available variable type flags (position %d):\n",
 544                 ENV_FLAGS_VARTYPE_LOC);
 545         puts("\tFlag\tVariable Type Name\n");
 546         puts("\t----\t------------------\n");
 547         env_flags_print_vartypes();
 548         puts("\n");
 549
 550         /* Print the available variable access types */
 551         printf("Available variable access flags (position %d):\n",
 552                 ENV_FLAGS_VARACCESS_LOC);
 553         puts("\tFlag\tVariable Access Name\n");
 554         puts("\t----\t--------------------\n");
 555         env_flags_print_varaccess();
 556         puts("\n");
 557
 558         /* Print the static flags that may exist */
 559         puts("Static flags:\n");
 560         printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
 561                 "Variable Access");
 562         printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
 563                 "---------------");
 564         env_attr_walk(ENV_FLAGS_LIST_STATIC, print_static_flags, NULL);
 565         puts("\n");
 566
 567         /* walk through each variable and print the flags if non-default */
 568         puts("Active flags:\n");
 569         printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
 570                 "Variable Access");
 571         printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
 572                 "---------------");
 573         hwalk_r(&env_htab, print_active_flags);
 574         return 0;
 575 }
 576 #endif
 577
 578 /*
 579  * Interactively edit an environment variable
 580  */
 581 #if defined(CONFIG_CMD_EDITENV)
 582 static int do_env_edit(cmd_tbl_t *cmdtp, int flag, int argc,
 583                        char * const argv[])
 584 {
 585         char buffer[CONFIG_SYS_CBSIZE];
 586         char *init_val;
 587
 588         if (argc < 2)
 589                 return CMD_RET_USAGE;
 590
 591         /* before import into hashtable */
 592         if (!(gd->flags & GD_FLG_ENV_READY))
 593                 return 1;
 594
 595         /* Set read buffer to initial value or empty sting */
 596         init_val = getenv(argv[1]);
 597         if (init_val)
 598                 sprintf(buffer, "%s", init_val);
 599         else
 600                 buffer[0] = '\0';
 601
 602         if (cli_readline_into_buffer("edit: ", buffer, 0) < 0)
 603                 return 1;
 604
 605         if (buffer[0] == '\0') {
 606                 const char * const _argv[3] = { "setenv", argv[1], NULL };
 607
 608                 return _do_env_set(0, 2, (char * const *)_argv, H_INTERACTIVE);
 609         } else {
 610                 const char * const _argv[4] = { "setenv", argv[1], buffer,
 611                         NULL };
 612
 613                 return _do_env_set(0, 3, (char * const *)_argv, H_INTERACTIVE);
 614         }
 615 }
 616 #endif /* CONFIG_CMD_EDITENV */
 617 #endif /* CONFIG_SPL_BUILD */
 618
 619 /*
 620  * Look up variable from environment,
 621  * return address of storage for that variable,
 622  * or NULL if not found
 623  */
 624 char *getenv(const char *name)
 625 {
 626         if (gd->flags & GD_FLG_ENV_READY) { /* after import into hashtable */
 627                 ENTRY e, *ep;
 628
 629                 WATCHDOG_RESET();
 630
 631                 e.key   = name;
 632                 e.data  = NULL;
 633                 hsearch_r(e, FIND, &ep, &env_htab, 0);
 634
 635                 return ep ? ep->data : NULL;
 636         }
 637
 638         /* restricted capabilities before import */
 639         if (getenv_f(name, (char *)(gd->env_buf), sizeof(gd->env_buf)) > 0)
 640                 return (char *)(gd->env_buf);
 641
 642         return NULL;
 643 }
 644
 645 /*
 646  * Look up variable from environment for restricted C runtime env.
 647  */
 648 int getenv_f(const char *name, char *buf, unsigned len)
 649 {
 650         int i, nxt;
 651
 652         for (i = 0; env_get_char(i) != '\0'; i = nxt + 1) {
 653                 int val, n;
 654
 655                 for (nxt = i; env_get_char(nxt) != '\0'; ++nxt) {
 656                         if (nxt >= CONFIG_ENV_SIZE)
 657                                 return -1;
 658                 }
 659
 660                 val = envmatch((uchar *)name, i);
 661                 if (val < 0)
 662                         continue;
 663
 664                 /* found; copy out */
 665                 for (n = 0; n < len; ++n, ++buf) {
 666                         *buf = env_get_char(val++);
 667                         if (*buf == '\0')
 668                                 return n;
 669                 }
 670
 671                 if (n)
 672                         *--buf = '\0';
 673
 674                 printf("env_buf [%d bytes] too small for value of \"%s\"\n",
 675                         len, name);
 676
 677                 return n;
 678         }
 679
 680         return -1;
 681 }
 682
 683 /**
 684  * Decode the integer value of an environment variable and return it.
 685  *
 686  * @param name          Name of environemnt variable
 687  * @param base          Number base to use (normally 10, or 16 for hex)
 688  * @param default_val   Default value to return if the variable is not
 689  *                      found
 690  * @return the decoded value, or default_val if not found
 691  */
 692 ulong getenv_ulong(const char *name, int base, ulong default_val)
 693 {
 694         /*
 695          * We can use getenv() here, even before relocation, since the
 696          * environment variable value is an integer and thus short.
 697          */
 698         const char *str = getenv(name);
 699
 700         return str ? simple_strtoul(str, NULL, base) : default_val;
 701 }
 702
 703 #ifndef CONFIG_SPL_BUILD
 704 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
 705 static int do_env_save(cmd_tbl_t *cmdtp, int flag, int argc,
 706                        char * const argv[])
 707 {
 708         printf("Saving Environment to %s...\n", env_name_spec);
 709
 710         return saveenv() ? 1 : 0;
 711 }
 712
 713 U_BOOT_CMD(
 714         saveenv, 1, 0,  do_env_save,
 715         "save environment variables to persistent storage",
 716         ""
 717 );
 718 #endif
 719 #endif /* CONFIG_SPL_BUILD */
 720
 721
 722 /*
 723  * Match a name / name=value pair
 724  *
 725  * s1 is either a simple 'name', or a 'name=value' pair.
 726  * i2 is the environment index for a 'name2=value2' pair.
 727  * If the names match, return the index for the value2, else -1.
 728  */
 729 int envmatch(uchar *s1, int i2)
 730 {
 731         if (s1 == NULL)
 732                 return -1;
 733
 734         while (*s1 == env_get_char(i2++))
 735                 if (*s1++ == '=')
 736                         return i2;
 737
 738         if (*s1 == '\0' && env_get_char(i2-1) == '=')
 739                 return i2;
 740
 741         return -1;
 742 }
 743
 744 #ifndef CONFIG_SPL_BUILD
 745 static int do_env_default(cmd_tbl_t *cmdtp, int __flag,
 746                           int argc, char * const argv[])
 747 {
 748         int all = 0, flag = 0;
 749
 750         debug("Initial value for argc=%d\n", argc);
 751         while (--argc > 0 && **++argv == '-') {
 752                 char *arg = *argv;
 753
 754                 while (*++arg) {
 755                         switch (*arg) {
 756                         case 'a':               /* default all */
 757                                 all = 1;
 758                                 break;
 759                         case 'f':               /* force */
 760                                 flag |= H_FORCE;
 761                                 break;
 762                         default:
 763                                 return cmd_usage(cmdtp);
 764                         }
 765                 }
 766         }
 767         debug("Final value for argc=%d\n", argc);
 768         if (all && (argc == 0)) {
 769                 /* Reset the whole environment */
 770                 set_default_env("## Resetting to default environment\n");
 771                 return 0;
 772         }
 773         if (!all && (argc > 0)) {
 774                 /* Reset individual variables */
 775                 set_default_vars(argc, argv);
 776                 return 0;
 777         }
 778
 779         return cmd_usage(cmdtp);
 780 }
 781
 782 static int do_env_delete(cmd_tbl_t *cmdtp, int flag,
 783                          int argc, char * const argv[])
 784 {
 785         int env_flag = H_INTERACTIVE;
 786         int ret = 0;
 787
 788         debug("Initial value for argc=%d\n", argc);
 789         while (argc > 1 && **(argv + 1) == '-') {
 790                 char *arg = *++argv;
 791
 792                 --argc;
 793                 while (*++arg) {
 794                         switch (*arg) {
 795                         case 'f':               /* force */
 796                                 env_flag |= H_FORCE;
 797                                 break;
 798                         default:
 799                                 return CMD_RET_USAGE;
 800                         }
 801                 }
 802         }
 803         debug("Final value for argc=%d\n", argc);
 804
 805         env_id++;
 806
 807         while (--argc > 0) {
 808                 char *name = *++argv;
 809
 810                 if (!hdelete_r(name, &env_htab, env_flag))
 811                         ret = 1;
 812         }
 813
 814         return ret;
 815 }
 816
 817 #ifdef CONFIG_CMD_EXPORTENV
 818 /*
 819  * env export [-t | -b | -c] [-s size] addr [var ...]
 820  *      -t:     export as text format; if size is given, data will be
 821  *              padded with '\0' bytes; if not, one terminating '\0'
 822  *              will be added (which is included in the "filesize"
 823  *              setting so you can for exmple copy this to flash and
 824  *              keep the termination).
 825  *      -b:     export as binary format (name=value pairs separated by
 826  *              '\0', list end marked by double "\0\0")
 827  *      -c:     export as checksum protected environment format as
 828  *              used for example by "saveenv" command
 829  *      -s size:
 830  *              size of output buffer
 831  *      addr:   memory address where environment gets stored
 832  *      var...  List of variable names that get included into the
 833  *              export. Without arguments, the whole environment gets
 834  *              exported.
 835  *
 836  * With "-c" and size is NOT given, then the export command will
 837  * format the data as currently used for the persistent storage,
 838  * i. e. it will use CONFIG_ENV_SECT_SIZE as output block size and
 839  * prepend a valid CRC32 checksum and, in case of resundant
 840  * environment, a "current" redundancy flag. If size is given, this
 841  * value will be used instead of CONFIG_ENV_SECT_SIZE; again, CRC32
 842  * checksum and redundancy flag will be inserted.
 843  *
 844  * With "-b" and "-t", always only the real data (including a
 845  * terminating '\0' byte) will be written; here the optional size
 846  * argument will be used to make sure not to overflow the user
 847  * provided buffer; the command will abort if the size is not
 848  * sufficient. Any remainign space will be '\0' padded.
 849  *
 850  * On successful return, the variable "filesize" will be set.
 851  * Note that filesize includes the trailing/terminating '\0' byte(s).
 852  *
 853  * Usage szenario:  create a text snapshot/backup of the current settings:
 854  *
 855  *      => env export -t 100000
 856  *      => era ${backup_addr} +${filesize}
 857  *      => cp.b 100000 ${backup_addr} ${filesize}
 858  *
 859  * Re-import this snapshot, deleting all other settings:
 860  *
 861  *      => env import -d -t ${backup_addr}
 862  */
 863 static int do_env_export(cmd_tbl_t *cmdtp, int flag,
 864                          int argc, char * const argv[])
 865 {
 866         char    buf[32];
 867         ulong   addr;
 868         char    *ptr, *cmd, *res;
 869         size_t  size = 0;
 870         ssize_t len;
 871         env_t   *envp;
 872         char    sep = '\n';
 873         int     chk = 0;
 874         int     fmt = 0;
 875
 876         cmd = *argv;
 877
 878         while (--argc > 0 && **++argv == '-') {
 879                 char *arg = *argv;
 880                 while (*++arg) {
 881                         switch (*arg) {
 882                         case 'b':               /* raw binary format */
 883                                 if (fmt++)
 884                                         goto sep_err;
 885                                 sep = '\0';
 886                                 break;
 887                         case 'c':               /* external checksum format */
 888                                 if (fmt++)
 889                                         goto sep_err;
 890                                 sep = '\0';
 891                                 chk = 1;
 892                                 break;
 893                         case 's':               /* size given */
 894                                 if (--argc <= 0)
 895                                         return cmd_usage(cmdtp);
 896                                 size = simple_strtoul(*++argv, NULL, 16);
 897                                 goto NXTARG;
 898                         case 't':               /* text format */
 899                                 if (fmt++)
 900                                         goto sep_err;
 901                                 sep = '\n';
 902                                 break;
 903                         default:
 904                                 return CMD_RET_USAGE;
 905                         }
 906                 }
 907 NXTARG:         ;
 908         }
 909
 910         if (argc < 1)
 911                 return CMD_RET_USAGE;
 912
 913         addr = simple_strtoul(argv[0], NULL, 16);
 914         ptr = map_sysmem(addr, size);
 915
 916         if (size)
 917                 memset(ptr, '\0', size);
 918
 919         argc--;
 920         argv++;
 921
 922         if (sep) {              /* export as text file */
 923                 len = hexport_r(&env_htab, sep,
 924                                 H_MATCH_KEY | H_MATCH_IDENT,
 925                                 &ptr, size, argc, argv);
 926                 if (len < 0) {
 927                         error("Cannot export environment: errno = %d\n", errno);
 928                         return 1;
 929                 }
 930                 sprintf(buf, "%zX", (size_t)len);
 931                 setenv("filesize", buf);
 932
 933                 return 0;
 934         }
 935
 936         envp = (env_t *)ptr;
 937
 938         if (chk)                /* export as checksum protected block */
 939                 res = (char *)envp->data;
 940         else                    /* export as raw binary data */
 941                 res = ptr;
 942
 943         len = hexport_r(&env_htab, '\0',
 944                         H_MATCH_KEY | H_MATCH_IDENT,
 945                         &res, ENV_SIZE, argc, argv);
 946         if (len < 0) {
 947                 error("Cannot export environment: errno = %d\n", errno);
 948                 return 1;
 949         }
 950
 951         if (chk) {
 952                 envp->crc = crc32(0, envp->data, ENV_SIZE);
 953 #ifdef CONFIG_ENV_ADDR_REDUND
 954                 envp->flags = ACTIVE_FLAG;
 955 #endif
 956         }
 957         setenv_hex("filesize", len + offsetof(env_t, data));
 958
 959         return 0;
 960
 961 sep_err:
 962         printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n", cmd);
 963         return 1;
 964 }
 965 #endif
 966
 967 #ifdef CONFIG_CMD_IMPORTENV
 968 /*
 969  * env import [-d] [-t [-r] | -b | -c] addr [size]
 970  *      -d:     delete existing environment before importing;
 971  *              otherwise overwrite / append to existion definitions
 972  *      -t:     assume text format; either "size" must be given or the
 973  *              text data must be '\0' terminated
 974  *      -r:     handle CRLF like LF, that means exported variables with
 975  *              a content which ends with \r won't get imported. Used
 976  *              to import text files created with editors which are using CRLF
 977  *              for line endings. Only effective in addition to -t.
 978  *      -b:     assume binary format ('\0' separated, "\0\0" terminated)
 979  *      -c:     assume checksum protected environment format
 980  *      addr:   memory address to read from
 981  *      size:   length of input data; if missing, proper '\0'
 982  *              termination is mandatory
 983  */
 984 static int do_env_import(cmd_tbl_t *cmdtp, int flag,
 985                          int argc, char * const argv[])
 986 {
 987         ulong   addr;
 988         char    *cmd, *ptr;
 989         char    sep = '\n';
 990         int     chk = 0;
 991         int     fmt = 0;
 992         int     del = 0;
 993         int     crlf_is_lf = 0;
 994         size_t  size;
 995
 996         cmd = *argv;
 997
 998         while (--argc > 0 && **++argv == '-') {
 999                 char *arg = *argv;
1000                 while (*++arg) {
1001                         switch (*arg) {
1002                         case 'b':               /* raw binary format */
1003                                 if (fmt++)
1004                                         goto sep_err;
1005                                 sep = '\0';
1006                                 break;
1007                         case 'c':               /* external checksum format */
1008                                 if (fmt++)
1009                                         goto sep_err;
1010                                 sep = '\0';
1011                                 chk = 1;
1012                                 break;
1013                         case 't':               /* text format */
1014                                 if (fmt++)
1015                                         goto sep_err;
1016                                 sep = '\n';
1017                                 break;
1018                         case 'r':               /* handle CRLF like LF */
1019                                 crlf_is_lf = 1;
1020                                 break;
1021                         case 'd':
1022                                 del = 1;
1023                                 break;
1024                         default:
1025                                 return CMD_RET_USAGE;
1026                         }
1027                 }
1028         }
1029
1030         if (argc < 1)
1031                 return CMD_RET_USAGE;
1032
1033         if (!fmt)
1034                 printf("## Warning: defaulting to text format\n");
1035
1036         if (sep != '\n' && crlf_is_lf )
1037                 crlf_is_lf = 0;
1038
1039         addr = simple_strtoul(argv[0], NULL, 16);
1040         ptr = map_sysmem(addr, 0);
1041
1042         if (argc == 2) {
1043                 size = simple_strtoul(argv[1], NULL, 16);
1044         } else if (argc == 1 && chk) {
1045                 puts("## Error: external checksum format must pass size\n");
1046                 return CMD_RET_FAILURE;
1047         } else {
1048                 char *s = ptr;
1049
1050                 size = 0;
1051
1052                 while (size < MAX_ENV_SIZE) {
1053                         if ((*s == sep) && (*(s+1) == '\0'))
1054                                 break;
1055                         ++s;
1056                         ++size;
1057                 }
1058                 if (size == MAX_ENV_SIZE) {
1059                         printf("## Warning: Input data exceeds %d bytes"
1060                                 " - truncated\n", MAX_ENV_SIZE);
1061                 }
1062                 size += 2;
1063                 printf("## Info: input data size = %zu = 0x%zX\n", size, size);
1064         }
1065
1066         if (chk) {
1067                 uint32_t crc;
1068                 env_t *ep = (env_t *)ptr;
1069
1070                 size -= offsetof(env_t, data);
1071                 memcpy(&crc, &ep->crc, sizeof(crc));
1072
1073                 if (crc32(0, ep->data, size) != crc) {
1074                         puts("## Error: bad CRC, import failed\n");
1075                         return 1;
1076                 }
1077                 ptr = (char *)ep->data;
1078         }
1079
1080         if (himport_r(&env_htab, ptr, size, sep, del ? 0 : H_NOCLEAR,
1081                         crlf_is_lf, 0, NULL) == 0) {
1082                 error("Environment import failed: errno = %d\n", errno);
1083                 return 1;
1084         }
1085         gd->flags |= GD_FLG_ENV_READY;
1086
1087         return 0;
1088
1089 sep_err:
1090         printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",
1091                 cmd);
1092         return 1;
1093 }
1094 #endif
1095
1096 #if defined(CONFIG_CMD_ENV_EXISTS)
1097 static int do_env_exists(cmd_tbl_t *cmdtp, int flag, int argc,
1098                        char * const argv[])
1099 {
1100         ENTRY e, *ep;
1101
1102         if (argc < 2)
1103                 return CMD_RET_USAGE;
1104
1105         e.key = argv[1];
1106         e.data = NULL;
1107         hsearch_r(e, FIND, &ep, &env_htab, 0);
1108
1109         return (ep == NULL) ? 1 : 0;
1110 }
1111 #endif
1112
1113 /*
1114  * New command line interface: "env" command with subcommands
1115  */
1116 static cmd_tbl_t cmd_env_sub[] = {
1117 #if defined(CONFIG_CMD_ASKENV)
1118         U_BOOT_CMD_MKENT(ask, CONFIG_SYS_MAXARGS, 1, do_env_ask, "", ""),
1119 #endif
1120         U_BOOT_CMD_MKENT(default, 1, 0, do_env_default, "", ""),
1121         U_BOOT_CMD_MKENT(delete, CONFIG_SYS_MAXARGS, 0, do_env_delete, "", ""),
1122 #if defined(CONFIG_CMD_EDITENV)
1123         U_BOOT_CMD_MKENT(edit, 2, 0, do_env_edit, "", ""),
1124 #endif
1125 #if defined(CONFIG_CMD_ENV_CALLBACK)
1126         U_BOOT_CMD_MKENT(callbacks, 1, 0, do_env_callback, "", ""),
1127 #endif
1128 #if defined(CONFIG_CMD_ENV_FLAGS)
1129         U_BOOT_CMD_MKENT(flags, 1, 0, do_env_flags, "", ""),
1130 #endif
1131 #if defined(CONFIG_CMD_EXPORTENV)
1132         U_BOOT_CMD_MKENT(export, 4, 0, do_env_export, "", ""),
1133 #endif
1134 #if defined(CONFIG_CMD_GREPENV)
1135         U_BOOT_CMD_MKENT(grep, CONFIG_SYS_MAXARGS, 1, do_env_grep, "", ""),
1136 #endif
1137 #if defined(CONFIG_CMD_IMPORTENV)
1138         U_BOOT_CMD_MKENT(import, 5, 0, do_env_import, "", ""),
1139 #endif
1140         U_BOOT_CMD_MKENT(print, CONFIG_SYS_MAXARGS, 1, do_env_print, "", ""),
1141 #if defined(CONFIG_CMD_RUN)
1142         U_BOOT_CMD_MKENT(run, CONFIG_SYS_MAXARGS, 1, do_run, "", ""),
1143 #endif
1144 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1145         U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
1146 #endif
1147         U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
1148 #if defined(CONFIG_CMD_ENV_EXISTS)
1149         U_BOOT_CMD_MKENT(exists, 2, 0, do_env_exists, "", ""),
1150 #endif
1151 };
1152
1153 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
1154 void env_reloc(void)
1155 {
1156         fixup_cmdtable(cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1157 }
1158 #endif
1159
1160 static int do_env(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
1161 {
1162         cmd_tbl_t *cp;
1163
1164         if (argc < 2)
1165                 return CMD_RET_USAGE;
1166
1167         /* drop initial "env" arg */
1168         argc--;
1169         argv++;
1170
1171         cp = find_cmd_tbl(argv[0], cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1172
1173         if (cp)
1174                 return cp->cmd(cmdtp, flag, argc, argv);
1175
1176         return CMD_RET_USAGE;
1177 }
1178
1179 #ifdef CONFIG_SYS_LONGHELP
1180 static char env_help_text[] =
1181 #if defined(CONFIG_CMD_ASKENV)
1182         "ask name [message] [size] - ask for environment variable\nenv "
1183 #endif
1184 #if defined(CONFIG_CMD_ENV_CALLBACK)
1185         "callbacks - print callbacks and their associated variables\nenv "
1186 #endif
1187         "default [-f] -a - [forcibly] reset default environment\n"
1188         "env default [-f] var [...] - [forcibly] reset variable(s) to their default values\n"
1189         "env delete [-f] var [...] - [forcibly] delete variable(s)\n"
1190 #if defined(CONFIG_CMD_EDITENV)
1191         "env edit name - edit environment variable\n"
1192 #endif
1193 #if defined(CONFIG_CMD_ENV_EXISTS)
1194         "env exists name - tests for existence of variable\n"
1195 #endif
1196 #if defined(CONFIG_CMD_EXPORTENV)
1197         "env export [-t | -b | -c] [-s size] addr [var ...] - export environment\n"
1198 #endif
1199 #if defined(CONFIG_CMD_ENV_FLAGS)
1200         "env flags - print variables that have non-default flags\n"
1201 #endif
1202 #if defined(CONFIG_CMD_GREPENV)
1203 #ifdef CONFIG_REGEX
1204         "env grep [-e] [-n | -v | -b] string [...] - search environment\n"
1205 #else
1206         "env grep [-n | -v | -b] string [...] - search environment\n"
1207 #endif
1208 #endif
1209 #if defined(CONFIG_CMD_IMPORTENV)
1210         "env import [-d] [-t [-r] | -b | -c] addr [size] - import environment\n"
1211 #endif
1212         "env print [-a | name ...] - print environment\n"
1213 #if defined(CONFIG_CMD_RUN)
1214         "env run var [...] - run commands in an environment variable\n"
1215 #endif
1216 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1217         "env save - save environment\n"
1218 #endif
1219         "env set [-f] name [arg ...]\n";
1220 #endif
1221
1222 U_BOOT_CMD(
1223         env, CONFIG_SYS_MAXARGS, 1, do_env,
1224         "environment handling commands", env_help_text
1225 );
1226
1227 /*
1228  * Old command line interface, kept for compatibility
1229  */
1230
1231 #if defined(CONFIG_CMD_EDITENV)
1232 U_BOOT_CMD_COMPLETE(
1233         editenv, 2, 0,  do_env_edit,
1234         "edit environment variable",
1235         "name\n"
1236         "    - edit environment variable 'name'",
1237         var_complete
1238 );
1239 #endif
1240
1241 U_BOOT_CMD_COMPLETE(
1242         printenv, CONFIG_SYS_MAXARGS, 1,        do_env_print,
1243         "print environment variables",
1244         "[-a]\n    - print [all] values of all environment variables\n"
1245         "printenv name ...\n"
1246         "    - print value of environment variable 'name'",
1247         var_complete
1248 );
1249
1250 #ifdef CONFIG_CMD_GREPENV
1251 U_BOOT_CMD_COMPLETE(
1252         grepenv, CONFIG_SYS_MAXARGS, 0,  do_env_grep,
1253         "search environment variables",
1254 #ifdef CONFIG_REGEX
1255         "[-e] [-n | -v | -b] string ...\n"
1256 #else
1257         "[-n | -v | -b] string ...\n"
1258 #endif
1259         "    - list environment name=value pairs matching 'string'\n"
1260 #ifdef CONFIG_REGEX
1261         "      \"-e\": enable regular expressions;\n"
1262 #endif
1263         "      \"-n\": search variable names; \"-v\": search values;\n"
1264         "      \"-b\": search both names and values (default)",
1265         var_complete
1266 );
1267 #endif
1268
1269 U_BOOT_CMD_COMPLETE(
1270         setenv, CONFIG_SYS_MAXARGS, 0,  do_env_set,
1271         "set environment variables",
1272         "[-f] name value ...\n"
1273         "    - [forcibly] set environment variable 'name' to 'value ...'\n"
1274         "setenv [-f] name\n"
1275         "    - [forcibly] delete environment variable 'name'",
1276         var_complete
1277 );
1278
1279 #if defined(CONFIG_CMD_ASKENV)
1280
1281 U_BOOT_CMD(
1282         askenv, CONFIG_SYS_MAXARGS,     1,      do_env_ask,
1283         "get environment variables from stdin",
1284         "name [message] [size]\n"
1285         "    - get environment variable 'name' from stdin (max 'size' chars)"
1286 );
1287 #endif
1288
1289 #if defined(CONFIG_CMD_RUN)
1290 U_BOOT_CMD_COMPLETE(
1291         run,    CONFIG_SYS_MAXARGS,     1,      do_run,
1292         "run commands in an environment variable",
1293         "var [...]\n"
1294         "    - run the commands in the environment variable(s) 'var'",
1295         var_complete
1296 );
1297 #endif
1298 #endif /* CONFIG_SPL_BUILD */