avr/env.c

   1 #include "common.h"
   2 #include <string.h>
   3 #include <stdlib.h>
   4
   5 #include <avr/eeprom.h>
   6
   7 #include "config.h"
   8 #include "debug.h"
   9 #include "xmalloc.h"
  10 #include "crc.h"
  11 #include "command.h"
  12
  13 #include "env.h"
  14
  15
  16 #define ENV_SIZE        (CONFIG_ENV_SIZE - sizeof(uint16_t) -1)
  17 #define ACTIVE_FLAG     1
  18 #define OBSOLETE_FLAG   0
  19 #define ENV_GET_VAL     (1<<0)
  20
  21
  22 /*
  23  * Default Environment
  24  */
  25
  26 #define DELIM           "\0"
  27
  28 const FLASH char default_env[] = {
  29         "bootdelay="    "3"             DELIM
  30         "bootcmd="      "reset; loadf; go $(startaddr)" DELIM
  31         "baudrate="     "115200"        DELIM
  32         "startaddr="    "0"             DELIM
  33         DELIM
  34 };
  35
  36 /* EEPROM storage */
  37 typedef struct environment_s {
  38         uint16_t        crc;            /* CRC16 over data bytes        */
  39         uint8_t         flags;          /* active/obsolete flags        */
  40         char            data[ENV_SIZE]; /* Environment data             */
  41 } env_t;
  42
  43
  44 /* */
  45 typedef struct env_item_s {
  46 #define EF_N_EEP        (1<<7)          /* Variable name is in EEPROM */
  47 #define EF_V_EEP        (1<<6)          /* Variable value is in EEPROM */
  48 #define EF_DIRTY        (1<<0)          /* Variable is new or value changed */
  49         uint8_t flags;
  50         union {
  51                 uint16_t eep;
  52                 char     *ram;
  53         } name;
  54         union {
  55                 uint16_t eep;
  56                 char     *ram;
  57         } val;
  58 } env_item_t;
  59
  60
  61 static uint8_t env_valid;
  62 static env_item_t env_list[CONFIG_ENVVAR_MAX];
  63 static int entrycount;
  64
  65
  66 static
  67 char env_get_char(uint16_t index)
  68 {
  69         unsigned int off = CONFIG_ENV_OFFSET;
  70
  71         if (env_valid == 2)
  72                 off = CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
  73
  74         return (char) eeprom_read_byte((const uint8_t *)off + index +
  75                                 offsetof(env_t, data));
  76 }
  77
  78
  79 static
  80 uint16_t varname_get(char *buf, env_item_t *ep)
  81 {
  82         int i = 0;
  83         char c;
  84
  85         if (ep->flags & EF_N_EEP) {
  86
  87                 while ((c = env_get_char(ep->name.eep + i)) != '=' &&
  88                                 c != '\0' && i < CONFIG_SYS_ENV_NAMELEN) {
  89
  90                         buf[i] = c;
  91                         i++;
  92                 }
  93                 if (i > 0 && c != '=') {
  94                         debug("** ee_name: '%s' not '=' terminated!\n", buf);
  95                 }
  96         } else {
  97                 strncpy(buf, ep->name.ram, CONFIG_SYS_ENV_NAMELEN);
  98                 i = strnlen(buf, CONFIG_SYS_ENV_NAMELEN);
  99         }
 100         buf[i] = '\0';
 101         return i;
 102 }
 103
 104
 105 static
 106 uint16_t varval_get(char *buf, uint16_t index, int len)
 107 {
 108         int i = 0;
 109         char c;
 110
 111         while ((c = env_get_char (index + i)) != '\0' && i < len) {
 112                 buf[i] = c;
 113                 i++;
 114         };
 115
 116         buf[i] = '\0';
 117
 118         /* TODO: len check */
 119
 120         return i;
 121 }
 122
 123 static
 124 int comp_env_key_item(const void *key, const void *item)
 125 {
 126         char buf[CONFIG_SYS_ENV_NAMELEN+1];
 127         env_item_t *ep = (env_item_t *) item;
 128
 129         varname_get(buf, ep);
 130
 131         return strcmp((char *) key, buf);
 132 }
 133
 134 static
 135 int comp_env_items(const void *m1, const void *m2)
 136 {
 137         char b1[CONFIG_SYS_ENV_NAMELEN+1];
 138         char b2[CONFIG_SYS_ENV_NAMELEN+1];
 139
 140         env_item_t *ep1 = (env_item_t *) m1;
 141         env_item_t *ep2 = (env_item_t *) m2;
 142
 143         varname_get(b1, ep1);
 144         varname_get(b2, ep2);
 145
 146         return strcmp(b1, b2);
 147 }
 148
 149
 150 static
 151 int envlist_import(void)
 152 {
 153         char name[CONFIG_SYS_ENV_NAMELEN+1];
 154         uint16_t idx = 0;
 155         int nlen;
 156         env_item_t e;
 157
 158         e.flags = EF_N_EEP | EF_V_EEP;
 159         e.name.eep = idx;
 160         while ((nlen = varname_get(name, &e)) != 0 && idx < ENV_SIZE) {
 161
 162                 if (entrycount <= CONFIG_ENVVAR_MAX) {
 163                         e.val.eep = idx + nlen + 1;
 164
 165                         env_list[entrycount++] = e;
 166
 167                         idx += nlen + 1;
 168                         while (env_get_char(idx++) != 0 && idx < ENV_SIZE)
 169                                 ;
 170                         e.name.eep = idx;
 171                 } else {
 172                         debug("** Too many environment variables!\n");
 173                         break;
 174                 }
 175         }
 176         qsort(env_list, entrycount, sizeof(env_item_t), comp_env_items);
 177
 178         return 0;
 179 }
 180
 181
 182 static
 183 int set_default_env(void)
 184 {
 185         char buf[56];
 186         uint16_t eep = CONFIG_ENV_OFFSET + offsetof(env_t, data);
 187         unsigned int len = ENV_SIZE;
 188         unsigned int i, src = 0;
 189         char c = 0xff, c0 = c;
 190
 191         if (env_valid == 1) {
 192                 eep = CONFIG_ENV_OFFSET + offsetof(env_t, data) + CONFIG_ENV_SIZE;
 193         }
 194
 195         while (len)  {
 196                 memcpy_P(buf, default_env+src, sizeof(buf));
 197                 for (i=0; i < (len < sizeof(buf) ? len : sizeof(buf)) &&
 198                                 !(c == 0 && c0 == 0);
 199                                 i++) {
 200                         c0 = c; c = buf[i];
 201                 }
 202                 eeprom_update_block(buf, (char *) eep, i);
 203                 if (c == 0 && c0 == 0)
 204                         len = 0;
 205                 if (len > sizeof(buf))
 206                         len -= sizeof(buf);
 207                 src += sizeof(buf);
 208                 eep += sizeof(buf);
 209         }
 210
 211         return 0;
 212 }
 213
 214
 215 static
 216 uint16_t env_crc(uint16_t data_offset)
 217 {
 218         uint16_t crc;
 219         uint16_t i;
 220         char c, c0;
 221
 222         crc = 0xffff;
 223         c = 0xff;
 224         for (i = 0; !(c == 0 && c0 == 0) && i < ENV_SIZE; i++)
 225         {
 226                 c0 = c;
 227                 c = eeprom_read_byte((const uint8_t *) data_offset + i);
 228                 crc = crc16(crc, c);
 229         }
 230         return crc ;
 231 }
 232
 233
 234 /**
 235  * return valid env
 236  */
 237 static
 238 int env_check_valid(void)
 239 {
 240         const uint16_t offset[2] = {CONFIG_ENV_OFFSET,
 241                                     CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE};
 242         uint_fast8_t flags[2], crc_ok[2];
 243         int rc;
 244
 245         /* read FLAGS */
 246         flags[0] = eeprom_read_byte ((uint8_t *) offset[0] +
 247                                 offsetof(env_t, flags));
 248         flags[1] = eeprom_read_byte ((uint8_t *) offset[1] +
 249                                 offsetof(env_t, flags));
 250
 251         /* check CRC */
 252         crc_ok[0] = (
 253                 eeprom_read_word((uint16_t *) offset[0] +
 254                                 offsetof(env_t, crc))
 255                 == env_crc(offset[0] + offsetof(env_t, data))
 256         );
 257         crc_ok[1] = (
 258                 eeprom_read_word((uint16_t *) offset[1] +
 259                                 offsetof(env_t, crc))
 260                 == env_crc(offset[1] + offsetof(env_t, data))
 261         );
 262
 263         if (!crc_ok[0] && !crc_ok[1]) {
 264                 rc = 0;
 265
 266         } else if (crc_ok[0] && !crc_ok[1]) {
 267                 rc = 1;
 268         } else if (!crc_ok[0] && crc_ok[1]) {
 269                 rc = 2;
 270         } else {
 271                 /* both ok - check serial */
 272 #if 1
 273                 if      (flags[1] == ACTIVE_FLAG && flags[0] != ACTIVE_FLAG)
 274                         rc = 2;
 275                 else if (flags[1] == OBSOLETE_FLAG && flags[0] == 0xFF)
 276                         rc = 2;
 277                 else
 278                         rc = 1;
 279 #else
 280                 if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG)
 281                         rc = 1;
 282                 else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG)
 283                         rc = 2;
 284                 else if (flags[0] == 0xFF && flags[1] == 0)
 285                         rc = 2;
 286                 else if (flags[1] == 0xFF && flags[0] == 0)
 287                         rc = 1;
 288                 else /* flags are equal - almost impossible */
 289                         rc = 1;
 290 #endif
 291         }
 292
 293         return rc;
 294 }
 295
 296
 297 int env_init(void)
 298 {
 299         env_valid = env_check_valid();
 300         if (env_valid == 0) {
 301                 printf_P(PSTR("*** Warning - bad CRC, "
 302                                 "using default environment\n\n"));
 303                 set_default_env();
 304         }
 305         entrycount = 0;
 306         envlist_import();
 307         return 0;
 308 }
 309
 310
 311 static
 312 env_item_t *envlist_search(const char *name)
 313 {
 314         return bsearch(name, env_list, entrycount,
 315                                 sizeof(env_item_t), comp_env_key_item);
 316 }
 317
 318
 319 static
 320 env_item_t *envlist_enter(env_item_t *e)
 321 {
 322         char *key = e->name.ram;
 323         const size_t size = sizeof(env_item_t);
 324         env_item_t *ep;
 325
 326         ep = bsearch(key, env_list, entrycount,
 327                         size, comp_env_key_item);
 328
 329         if (ep == NULL) {
 330                 if (entrycount < CONFIG_ENVVAR_MAX) {
 331
 332                         env_list[entrycount++] = *e;
 333                         qsort(env_list, entrycount, size, comp_env_items);
 334                         ep = bsearch(key, env_list, entrycount,
 335                                                 size, comp_env_key_item);
 336                 }
 337         } else {
 338                 if ((ep->flags & EF_V_EEP) == 0) {
 339                         free(ep->val.ram);
 340                 }
 341                 ep->val.ram = e->val.ram;
 342         }
 343
 344         if (ep != NULL) {
 345                 ep->flags |= EF_DIRTY;
 346                 ep->flags &= ~EF_V_EEP;
 347
 348                 if ((ep->flags & EF_N_EEP) == 0) {
 349                         int nlen = strnlen(key, CONFIG_SYS_ENV_NAMELEN);
 350                         char *name = xmalloc(nlen + 1);
 351                         if (name == NULL) {
 352                                 printf_P(PSTR("## Can't malloc %d bytes\n"),
 353                                         nlen + 1);
 354                                 return NULL;
 355                         }
 356                         strcpy(name, key);
 357                         name[nlen] = '\0';
 358                         ep->name.ram = name;
 359                 }
 360         }
 361
 362         return ep;
 363 }
 364
 365
 366 static
 367 int env_item_delete(env_item_t *ep)
 368 {
 369         if (entrycount == 0)
 370                 return -1;
 371         if ((ep->flags & EF_V_EEP) == 0)
 372                 free(ep->val.ram);
 373         if ((ep->flags & EF_N_EEP) == 0)
 374                 free(ep->name.ram);
 375
 376         entrycount--;
 377         size_t size = sizeof(env_item_t);
 378         memmove(ep, ep + 1, (env_list - ep)*size + entrycount*size);
 379
 380         return 0;
 381 }
 382
 383 static
 384 int envlist_delete(const char *name)
 385 {
 386         env_item_t *ep = bsearch(name, env_list, entrycount,
 387                                 sizeof(env_item_t), comp_env_key_item);
 388
 389         if (ep != NULL)
 390                 return env_item_delete(ep);
 391
 392         return 1;
 393 }
 394
 395
 396 static
 397 env_item_t *envlist_get(const char *name, uint_fast8_t flag)
 398 {
 399         env_item_t *ep;
 400
 401         ep = envlist_search(name);
 402
 403         if (ep != NULL && (flag & ENV_GET_VAL)) {
 404                 if (ep->flags & EF_V_EEP) {
 405                         char *vp;
 406                         uint_fast8_t len;
 407                         /* TODO: function that gets len of val,
 408                            to get rid of xrealloc */
 409                         vp = xmalloc(CONFIG_SYS_CBSIZE);
 410                         len = varval_get(vp, ep->val.eep, CONFIG_SYS_CBSIZE);
 411                         ep->val.ram = xrealloc(vp, len + 1);
 412                         ep->flags &= ~EF_V_EEP;
 413                 }
 414         }
 415
 416         return ep;
 417 }
 418
 419
 420 char *getenv(const char *name)
 421 {
 422         env_item_t *ep;
 423         char *ret = NULL;
 424
 425         ep = envlist_get(name, ENV_GET_VAL);
 426         if (ep != NULL)
 427                 ret = ep->val.ram;
 428         return ret;
 429 }
 430
 431 static
 432 int env_item_save(env_item_t *ep, uint16_t offset, int space_left)
 433 {
 434         char buf[CONFIG_SYS_ENV_NAMELEN+1];
 435         int len;
 436         env_item_t e = *ep;
 437
 438         len = varname_get(buf, ep);
 439         if (len == 0)
 440                 return 0;
 441         buf[len++] = '=';
 442         space_left -= len;
 443
 444         if (space_left <= 0)
 445                 return 0;
 446
 447         eeprom_update_block(buf, (uint8_t *) offset, len);
 448         offset += len;
 449
 450         if (e.val.ram != NULL) {
 451                 char c;
 452                 do {
 453                         if (e.flags & EF_V_EEP)
 454                                 c = env_get_char(e.val.eep++);
 455                         else
 456                                 c = *e.val.ram++;
 457
 458                         eeprom_update_byte((uint8_t *) offset, c);
 459                         offset++;
 460                         space_left--;
 461                         len++;
 462                 } while ((c != '\0') && space_left );
 463         }
 464         return len;
 465 }
 466
 467
 468 static
 469 int saveenv(void)
 470 {
 471         unsigned int off     = CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
 472         unsigned int off_red = CONFIG_ENV_OFFSET;
 473         unsigned int pos;
 474         int len, left;
 475         uint16_t crc;
 476         int rc = 0;
 477
 478         if (env_valid == 2) {
 479                 off     = CONFIG_ENV_OFFSET;
 480                 off_red = CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
 481         }
 482
 483         eeprom_update_byte((uint8_t *) off + offsetof(env_t, flags), 0xff);
 484
 485         pos = off + offsetof(env_t, data);
 486         left = ENV_SIZE - 1;
 487         for (int i = 0 ; i < entrycount; i++) {
 488                 len = env_item_save(&env_list[i], pos, left);
 489                 if (len == 0) {
 490                         return 1;
 491                 }
 492                 pos += len;
 493                 left -= len;
 494         }
 495         /* terminate list */
 496         eeprom_update_byte((uint8_t *) pos, 0);
 497         crc = env_crc(off + offsetof(env_t, data));
 498         eeprom_update_word((uint16_t *) off + offsetof(env_t, crc), crc);
 499         eeprom_update_byte((uint8_t *) off + offsetof(env_t, flags),
 500                                         ACTIVE_FLAG);
 501
 502         if (rc == 0) {
 503                 while (entrycount != 0) {
 504                         env_item_delete(&env_list[entrycount-1]);
 505                 }
 506                 eeprom_update_byte((uint8_t *) off_red + offsetof(env_t, flags),
 507                                         OBSOLETE_FLAG);
 508                 env_valid = (env_valid == 2) ? 1 : 2;
 509
 510                 envlist_import();
 511         }
 512
 513         return rc;
 514 }
 515
 516
 517 static
 518 int env_item_print(env_item_t *ep)
 519 {
 520         char buf[CONFIG_SYS_ENV_NAMELEN+1];
 521         int len;
 522         env_item_t e = *ep;
 523
 524         varname_get(buf, ep);
 525         len = printf_P(PSTR("%s="), buf);
 526
 527         if (e.val.ram != NULL) {
 528                 while (1) {
 529                         char c;
 530                         if (e.flags & EF_V_EEP)
 531                                 c = env_get_char(e.val.eep++);
 532                         else
 533                                 c = *e.val.ram++;
 534
 535                         if (c != '\0') {
 536                                 putchar(c);
 537                                 len++;
 538                         } else
 539                                 break;
 540                 }
 541         }
 542         putchar('\n');
 543         len ++;
 544
 545         return len;
 546 }
 547
 548
 549 /*
 550  * Command interface: print one or all environment variables
 551  *
 552  * Returns -1 in case of error, or length of printed string
 553  */
 554 static
 555 int env_print(char *name)
 556 {
 557         int len = -1;
 558
 559         if (name) {             /* print a single name */
 560
 561                 env_item_t *ep = envlist_search(name);
 562                 if (ep != NULL)
 563                         len = env_item_print(ep);
 564
 565         } else {                /* print whole list */
 566                 len = 0;
 567                 for (int i = 0 ; i < entrycount; i++) {
 568                         len += env_item_print(&env_list[i]);
 569                 }
 570         }
 571         return len;
 572 }
 573
 574 static
 575 int env_print_ramsize(void)
 576 {
 577         int size = 0;
 578         uint8_t name_cnt = 0;
 579         uint8_t val_cnt = 0;
 580
 581         for (int i = 0 ; i < entrycount; i++) {
 582                 if ((env_list[i].flags & EF_N_EEP) == 0 &&
 583                                 (env_list[i].name.ram != NULL)) {
 584                         name_cnt++;
 585                         size += strlen(env_list[i].name.ram) + 3;
 586                 }
 587                 if ((env_list[i].flags & EF_V_EEP) == 0 &&
 588                                 (env_list[i].val.ram != NULL)) {
 589                         val_cnt++;
 590                         size += strlen(env_list[i].val.ram) + 3;
 591                 }
 592         }
 593         printf_P(PSTR("%d bytes RAM used for %u names and %u values\n"),
 594                         size, name_cnt, val_cnt);
 595         return size;
 596 }
 597
 598
 599 int do_env_print(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 600 {
 601         int i;
 602         int rcode = 0;
 603
 604         (void) cmdtp; (void) flag;
 605
 606         if (argc == 1) {
 607                 /* print all env vars */
 608                 rcode = env_print(NULL);
 609                 if (rcode < 0)
 610                         return 1;
 611                 printf_P(PSTR("\nEnvironment size: %d/%d bytes\n"),
 612                         rcode, ENV_SIZE);
 613                 env_print_ramsize();
 614                 return 0;
 615         }
 616
 617         /* print selected env vars */
 618         for (i = 1; i < argc; ++i) {
 619                 int rc = env_print(argv[i]);
 620                 if (rc < 0) {
 621                         printf_P(PSTR("## Error: \"%s\" not defined\n"), argv[i]);
 622                         ++rcode;
 623                 }
 624         }
 625
 626         return rcode;
 627 }
 628
 629
 630 /**
 631  * Set or delete environment variable
 632  *
 633  * Set a new environment variable,
 634  * or replace or delete an existing one.
 635  *
 636  * @param flag          (not used)
 637  * @param argc
 638  * @param argv[1]       Environment variable to set or delete
 639  *                      if no more args
 640  * @param argv[2] ...   Value to set it to
 641  *
 642  * @return 0 if ok, 1 on error
 643  */
 644 static
 645 int _do_env_set(int flag, int argc, char * const argv[])
 646 {
 647         int i, len;
 648         char *name, *value, *s;
 649         env_item_t e, *ep;
 650
 651         (void) flag;
 652         debug("Initial value for argc=%d\n", argc);
 653
 654         name = argv[1];
 655         value = argv[2];
 656
 657         if (strchr(name, '=')) {
 658                 printf_P(PSTR("## Error: illegal character '='"
 659                        "in variable name \"%s\"\n"), name);
 660                 return 1;
 661         }
 662         if (strlen(name) > CONFIG_SYS_ENV_NAMELEN) {
 663                 printf_P(PSTR("## Error: Variable name \"%s\" too long. "
 664                        "(max %d characters)\n"), name, CONFIG_SYS_ENV_NAMELEN);
 665                 return 1;
 666         }
 667 /*
 668         env_id++;
 669 */
 670         /* Delete only ? */
 671         if (argc < 3 || argv[2] == NULL) {
 672                 int rc = envlist_delete(name);
 673                 return rc != 0;
 674         }
 675
 676         /*
 677          * Insert / replace new value
 678          */
 679         for (i = 2, len = 0; i < argc; ++i)
 680                 len += strlen(argv[i]) + 1;
 681
 682         value = xmalloc(len);
 683         if (value == NULL) {
 684                 printf_P(PSTR("## Can't malloc %d bytes\n"), len);
 685                 return 1;
 686         }
 687         for (i = 2, s = value; i < argc; ++i) {
 688                 char *v = argv[i];
 689
 690                 while ((*s++ = *v++) != '\0')
 691                         ;
 692                 *(s - 1) = ' ';
 693         }
 694         if (s != value)
 695                 *--s = '\0';
 696
 697         e.flags = EF_DIRTY;
 698         e.name.ram = name;
 699         e.val.ram = value;
 700         ep = envlist_enter(&e);
 701         if (!ep) {
 702                 printf_P(PSTR("## Error inserting \"%s\" variable.\n"),
 703                         name);
 704                 return 1;
 705         }
 706
 707         return 0;
 708 }
 709
 710 /**
 711  * Set an environment variable
 712  *
 713  * @param varname       Environment variable to set
 714  * @param varvalue      Value to set it to
 715  * @return 0 if ok, 1 on error
 716  */
 717 static
 718 int setenv(const char *varname, const char *varvalue)
 719 {
 720         const char * const argv[3] = { NULL, varname, varvalue };
 721         int argc = 3;
 722
 723         if (varvalue == NULL || varvalue[0] == '\0')
 724                 --argc;
 725
 726         return _do_env_set(0, argc, (char * const *)argv);
 727 }
 728
 729 #if 0
 730 /**
 731  * Set an environment variable to an integer value
 732  *
 733  * @param varname       Environment variable to set
 734  * @param value         Value to set it to
 735  * @return 0 if ok, 1 on error
 736  */
 737 int setenv_ulong(const char *varname, unsigned long value)
 738 {
 739         /* TODO: this should be unsigned */
 740         char *str = simple_itoa(value);
 741
 742         return setenv(varname, str);
 743 }
 744 #endif
 745
 746
 747 /**
 748  * Set an environment variable to an value in hex
 749  *
 750  * @param varname       Environment variable to set
 751  * @param value         Value to set it to
 752  * @return 0 if ok, 1 on error
 753  */
 754 int setenv_hex(const char *varname, unsigned long value)
 755 {
 756         char str[sizeof(unsigned long) *2 + 1];
 757
 758         sprintf_P(str, PSTR("%lx"), value);
 759         return setenv(varname, str);
 760 }
 761
 762 /**
 763  * Get an environment variable as a hex value
 764  *
 765  * @param varname       Environment variable to get
 766  * @param default_val   Return this, if variable does not exist
 767  * @return hex value of variable or default_val
 768  */
 769 unsigned long getenv_hex(const char *varname, unsigned long default_val)
 770 {
 771         const char *s;
 772         unsigned long value;
 773         char *endp;
 774
 775         s = getenv(varname);
 776         if (s)
 777                 value = strtoul(s, &endp, 16);
 778         if (!s || endp == s)
 779                 return default_val;
 780
 781         return value;
 782 }
 783
 784 int do_env_set(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 785 {
 786         (void) cmdtp;
 787
 788         if (argc < 2)
 789                 return CMD_RET_USAGE;
 790
 791         return _do_env_set(flag, argc, argv);
 792 }
 793
 794
 795 int do_env_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 796 {
 797         (void) cmdtp; (void) flag; (void) argc; (void) argv;
 798
 799         printf_P(PSTR("Saving Environment ...\n"));
 800         return saveenv() ? 1 : 0;
 801 }
 802
 803 #if defined(CONFIG_AUTO_COMPLETE)
 804 int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf)
 805 {
 806         ENTRY *match;
 807         int found, idx;
 808
 809         idx = 0;
 810         found = 0;
 811         cmdv[0] = NULL;
 812
 813         while ((idx = hmatch_r(var, idx, &match, &env_htab))) {
 814                 int vallen = strlen(match->key) + 1;
 815
 816                 if (found >= maxv - 2 || bufsz < vallen)
 817                         break;
 818
 819                 cmdv[found++] = buf;
 820                 memcpy(buf, match->key, vallen);
 821                 buf += vallen;
 822                 bufsz -= vallen;
 823         }
 824
 825         qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar);
 826
 827         if (idx)
 828                 cmdv[found++] = "...";
 829
 830         cmdv[found] = NULL;
 831         return found;
 832 }
 833 #endif