common/command.c

   1 /*
   2  * (C) Copyright 2000-2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  *  Command Processor Table
  26  */
  27
  28 #include <common.h>
  29 #include <command.h>
  30
  31 int
  32 do_version (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  33 {
  34         extern char version_string[];
  35         printf ("\n%s\n", version_string);
  36         return 0;
  37 }
  38
  39 U_BOOT_CMD(
  40         version,        1,              1,      do_version,
  41         "version - print monitor version\n",
  42         NULL
  43 );
  44
  45 #if defined(CONFIG_CMD_ECHO)
  46
  47 int
  48 do_echo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  49 {
  50         int i, putnl = 1;
  51
  52         for (i = 1; i < argc; i++) {
  53                 char *p = argv[i], c;
  54
  55                 if (i > 1)
  56                         putc(' ');
  57                 while ((c = *p++) != '\0') {
  58                         if (c == '\\' && *p == 'c') {
  59                                 putnl = 0;
  60                                 p++;
  61                         } else {
  62                                 putc(c);
  63                         }
  64                 }
  65         }
  66
  67         if (putnl)
  68                 putc('\n');
  69         return 0;
  70 }
  71
  72 U_BOOT_CMD(
  73         echo,   CFG_MAXARGS,    1,      do_echo,
  74         "echo    - echo args to console\n",
  75         "[args..]\n"
  76         "    - echo args to console; \\c suppresses newline\n"
  77 );
  78
  79 #endif
  80
  81 #ifdef CFG_HUSH_PARSER
  82
  83 int
  84 do_test (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  85 {
  86         char **ap;
  87         int left, adv, expr, last_expr, neg, last_cmp;
  88
  89         /* args? */
  90         if (argc < 3)
  91                 return 1;
  92
  93 #if 0
  94         {
  95                 printf("test:");
  96                 left = 1;
  97                 while (argv[left])
  98                         printf(" %s", argv[left++]);
  99         }
 100 #endif
 101
 102         last_expr = 0;
 103         left = argc - 1; ap = argv + 1;
 104         if (left > 0 && strcmp(ap[0], "!") == 0) {
 105                 neg = 1;
 106                 ap++;
 107                 left--;
 108         } else
 109                 neg = 0;
 110
 111         expr = -1;
 112         last_cmp = -1;
 113         last_expr = -1;
 114         while (left > 0) {
 115
 116                 if (strcmp(ap[0], "-o") == 0 || strcmp(ap[0], "-a") == 0)
 117                         adv = 1;
 118                 else if (strcmp(ap[0], "-z") == 0 || strcmp(ap[0], "-n") == 0)
 119                         adv = 2;
 120                 else
 121                         adv = 3;
 122
 123                 if (left < adv) {
 124                         expr = 1;
 125                         break;
 126                 }
 127
 128                 if (adv == 1) {
 129                         if (strcmp(ap[0], "-o") == 0) {
 130                                 last_expr = expr;
 131                                 last_cmp = 0;
 132                         } else if (strcmp(ap[0], "-a") == 0) {
 133                                 last_expr = expr;
 134                                 last_cmp = 1;
 135                         } else {
 136                                 expr = 1;
 137                                 break;
 138                         }
 139                 }
 140
 141                 if (adv == 2) {
 142                         if (strcmp(ap[0], "-z") == 0)
 143                                 expr = strlen(ap[1]) == 0 ? 1 : 0;
 144                         else if (strcmp(ap[0], "-n") == 0)
 145                                 expr = strlen(ap[1]) == 0 ? 0 : 1;
 146                         else {
 147                                 expr = 1;
 148                                 break;
 149                         }
 150
 151                         if (last_cmp == 0)
 152                                 expr = last_expr || expr;
 153                         else if (last_cmp == 1)
 154                                 expr = last_expr && expr;
 155                         last_cmp = -1;
 156                 }
 157
 158                 if (adv == 3) {
 159                         if (strcmp(ap[1], "=") == 0)
 160                                 expr = strcmp(ap[0], ap[2]) == 0;
 161                         else if (strcmp(ap[1], "!=") == 0)
 162                                 expr = strcmp(ap[0], ap[2]) != 0;
 163                         else if (strcmp(ap[1], ">") == 0)
 164                                 expr = strcmp(ap[0], ap[2]) > 0;
 165                         else if (strcmp(ap[1], "<") == 0)
 166                                 expr = strcmp(ap[0], ap[2]) < 0;
 167                         else if (strcmp(ap[1], "-eq") == 0)
 168                                 expr = simple_strtol(ap[0], NULL, 10) == simple_strtol(ap[2], NULL, 10);
 169                         else if (strcmp(ap[1], "-ne") == 0)
 170                                 expr = simple_strtol(ap[0], NULL, 10) != simple_strtol(ap[2], NULL, 10);
 171                         else if (strcmp(ap[1], "-lt") == 0)
 172                                 expr = simple_strtol(ap[0], NULL, 10) < simple_strtol(ap[2], NULL, 10);
 173                         else if (strcmp(ap[1], "-le") == 0)
 174                                 expr = simple_strtol(ap[0], NULL, 10) <= simple_strtol(ap[2], NULL, 10);
 175                         else if (strcmp(ap[1], "-gt") == 0)
 176                                 expr = simple_strtol(ap[0], NULL, 10) > simple_strtol(ap[2], NULL, 10);
 177                         else if (strcmp(ap[1], "-ge") == 0)
 178                                 expr = simple_strtol(ap[0], NULL, 10) >= simple_strtol(ap[2], NULL, 10);
 179                         else {
 180                                 expr = 1;
 181                                 break;
 182                         }
 183
 184                         if (last_cmp == 0)
 185                                 expr = last_expr || expr;
 186                         else if (last_cmp == 1)
 187                                 expr = last_expr && expr;
 188                         last_cmp = -1;
 189                 }
 190
 191                 ap += adv; left -= adv;
 192         }
 193
 194         if (neg)
 195                 expr = !expr;
 196
 197         expr = !expr;
 198
 199 #if 0
 200         printf(": returns %d\n", expr);
 201 #endif
 202
 203         return expr;
 204 }
 205
 206 U_BOOT_CMD(
 207         test,   CFG_MAXARGS,    1,      do_test,
 208         "test    - minimal test like /bin/sh\n",
 209         "[args..]\n"
 210         "    - test functionality\n"
 211 );
 212
 213 int
 214 do_exit (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 215 {
 216         int r;
 217
 218         r = 0;
 219         if (argc > 1)
 220                 r = simple_strtoul(argv[1], NULL, 10);
 221
 222         return -r - 2;
 223 }
 224
 225 U_BOOT_CMD(
 226         exit,   2,      1,      do_exit,
 227         "exit    - exit script\n",
 228         "    - exit functionality\n"
 229 );
 230
 231
 232 #endif
 233
 234 /*
 235  * Use puts() instead of printf() to avoid printf buffer overflow
 236  * for long help messages
 237  */
 238 int do_help (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 239 {
 240         int i;
 241         int rcode = 0;
 242
 243         if (argc == 1) {        /*show list of commands */
 244
 245                 int cmd_items = &__u_boot_cmd_end -
 246                                 &__u_boot_cmd_start;    /* pointer arith! */
 247                 cmd_tbl_t *cmd_array[cmd_items];
 248                 int i, j, swaps;
 249
 250                 /* Make array of commands from .uboot_cmd section */
 251                 cmdtp = &__u_boot_cmd_start;
 252                 for (i = 0; i < cmd_items; i++) {
 253                         cmd_array[i] = cmdtp++;
 254                 }
 255
 256                 /* Sort command list (trivial bubble sort) */
 257                 for (i = cmd_items - 1; i > 0; --i) {
 258                         swaps = 0;
 259                         for (j = 0; j < i; ++j) {
 260                                 if (strcmp (cmd_array[j]->name,
 261                                             cmd_array[j + 1]->name) > 0) {
 262                                         cmd_tbl_t *tmp;
 263                                         tmp = cmd_array[j];
 264                                         cmd_array[j] = cmd_array[j + 1];
 265                                         cmd_array[j + 1] = tmp;
 266                                         ++swaps;
 267                                 }
 268                         }
 269                         if (!swaps)
 270                                 break;
 271                 }
 272
 273                 /* print short help (usage) */
 274                 for (i = 0; i < cmd_items; i++) {
 275                         const char *usage = cmd_array[i]->usage;
 276
 277                         /* allow user abort */
 278                         if (ctrlc ())
 279                                 return 1;
 280                         if (usage == NULL)
 281                                 continue;
 282                         puts (usage);
 283                 }
 284                 return 0;
 285         }
 286         /*
 287          * command help (long version)
 288          */
 289         for (i = 1; i < argc; ++i) {
 290                 if ((cmdtp = find_cmd (argv[i])) != NULL) {
 291 #ifdef  CFG_LONGHELP
 292                         /* found - print (long) help info */
 293                         puts (cmdtp->name);
 294                         putc (' ');
 295                         if (cmdtp->help) {
 296                                 puts (cmdtp->help);
 297                         } else {
 298                                 puts ("- No help available.\n");
 299                                 rcode = 1;
 300                         }
 301                         putc ('\n');
 302 #else   /* no long help available */
 303                         if (cmdtp->usage)
 304                                 puts (cmdtp->usage);
 305 #endif  /* CFG_LONGHELP */
 306                 } else {
 307                         printf ("Unknown command '%s' - try 'help'"
 308                                 " without arguments for list of all"
 309                                 " known commands\n\n", argv[i]
 310                                         );
 311                         rcode = 1;
 312                 }
 313         }
 314         return rcode;
 315 }
 316
 317
 318 U_BOOT_CMD(
 319         help,   CFG_MAXARGS,    1,      do_help,
 320         "help    - print online help\n",
 321         "[command ...]\n"
 322         "    - show help information (for 'command')\n"
 323         "'help' prints online help for the monitor commands.\n\n"
 324         "Without arguments, it prints a short usage message for all commands.\n\n"
 325         "To get detailed help information for specific commands you can type\n"
 326   "'help' with one or more command names as arguments.\n"
 327 );
 328
 329 /* This do not ust the U_BOOT_CMD macro as ? can't be used in symbol names */
 330 #ifdef  CFG_LONGHELP
 331 cmd_tbl_t __u_boot_cmd_question_mark Struct_Section = {
 332         "?",    CFG_MAXARGS,    1,      do_help,
 333         "?       - alias for 'help'\n",
 334         NULL
 335 };
 336 #else
 337 cmd_tbl_t __u_boot_cmd_question_mark Struct_Section = {
 338         "?",    CFG_MAXARGS,    1,      do_help,
 339         "?       - alias for 'help'\n"
 340 };
 341 #endif /* CFG_LONGHELP */
 342
 343 /***************************************************************************
 344  * find command table entry for a command
 345  */
 346 cmd_tbl_t *find_cmd (const char *cmd)
 347 {
 348         cmd_tbl_t *cmdtp;
 349         cmd_tbl_t *cmdtp_temp = &__u_boot_cmd_start;    /*Init value */
 350         const char *p;
 351         int len;
 352         int n_found = 0;
 353
 354         /*
 355          * Some commands allow length modifiers (like "cp.b");
 356          * compare command name only until first dot.
 357          */
 358         len = ((p = strchr(cmd, '.')) == NULL) ? strlen (cmd) : (p - cmd);
 359
 360         for (cmdtp = &__u_boot_cmd_start;
 361              cmdtp != &__u_boot_cmd_end;
 362              cmdtp++) {
 363                 if (strncmp (cmd, cmdtp->name, len) == 0) {
 364                         if (len == strlen (cmdtp->name))
 365                                 return cmdtp;   /* full match */
 366
 367                         cmdtp_temp = cmdtp;     /* abbreviated command ? */
 368                         n_found++;
 369                 }
 370         }
 371         if (n_found == 1) {                     /* exactly one match */
 372                 return cmdtp_temp;
 373         }
 374
 375         return NULL;    /* not found or ambiguous command */
 376 }
 377
 378 #ifdef CONFIG_AUTO_COMPLETE
 379
 380 int var_complete(int argc, char *argv[], char last_char, int maxv, char *cmdv[])
 381 {
 382         static char tmp_buf[512];
 383         int space;
 384
 385         space = last_char == '\0' || last_char == ' ' || last_char == '\t';
 386
 387         if (space && argc == 1)
 388                 return env_complete("", maxv, cmdv, sizeof(tmp_buf), tmp_buf);
 389
 390         if (!space && argc == 2)
 391                 return env_complete(argv[1], maxv, cmdv, sizeof(tmp_buf), tmp_buf);
 392
 393         return 0;
 394 }
 395
 396 static void install_auto_complete_handler(const char *cmd,
 397                 int (*complete)(int argc, char *argv[], char last_char, int maxv, char *cmdv[]))
 398 {
 399         cmd_tbl_t *cmdtp;
 400
 401         cmdtp = find_cmd(cmd);
 402         if (cmdtp == NULL)
 403                 return;
 404
 405         cmdtp->complete = complete;
 406 }
 407
 408 void install_auto_complete(void)
 409 {
 410         install_auto_complete_handler("printenv", var_complete);
 411         install_auto_complete_handler("setenv", var_complete);
 412 #if defined(CONFIG_CMD_RUN)
 413         install_auto_complete_handler("run", var_complete);
 414 #endif
 415 }
 416
 417 /*************************************************************************************/
 418
 419 static int complete_cmdv(int argc, char *argv[], char last_char, int maxv, char *cmdv[])
 420 {
 421         cmd_tbl_t *cmdtp;
 422         const char *p;
 423         int len, clen;
 424         int n_found = 0;
 425         const char *cmd;
 426
 427         /* sanity? */
 428         if (maxv < 2)
 429                 return -2;
 430
 431         cmdv[0] = NULL;
 432
 433         if (argc == 0) {
 434                 /* output full list of commands */
 435                 for (cmdtp = &__u_boot_cmd_start; cmdtp != &__u_boot_cmd_end; cmdtp++) {
 436                         if (n_found >= maxv - 2) {
 437                                 cmdv[n_found++] = "...";
 438                                 break;
 439                         }
 440                         cmdv[n_found++] = cmdtp->name;
 441                 }
 442                 cmdv[n_found] = NULL;
 443                 return n_found;
 444         }
 445
 446         /* more than one arg or one but the start of the next */
 447         if (argc > 1 || (last_char == '\0' || last_char == ' ' || last_char == '\t')) {
 448                 cmdtp = find_cmd(argv[0]);
 449                 if (cmdtp == NULL || cmdtp->complete == NULL) {
 450                         cmdv[0] = NULL;
 451                         return 0;
 452                 }
 453                 return (*cmdtp->complete)(argc, argv, last_char, maxv, cmdv);
 454         }
 455
 456         cmd = argv[0];
 457         /*
 458          * Some commands allow length modifiers (like "cp.b");
 459          * compare command name only until first dot.
 460          */
 461         p = strchr(cmd, '.');
 462         if (p == NULL)
 463                 len = strlen(cmd);
 464         else
 465                 len = p - cmd;
 466
 467         /* return the partial matches */
 468         for (cmdtp = &__u_boot_cmd_start; cmdtp != &__u_boot_cmd_end; cmdtp++) {
 469
 470                 clen = strlen(cmdtp->name);
 471                 if (clen < len)
 472                         continue;
 473
 474                 if (memcmp(cmd, cmdtp->name, len) != 0)
 475                         continue;
 476
 477                 /* too many! */
 478                 if (n_found >= maxv - 2) {
 479                         cmdv[n_found++] = "...";
 480                         break;
 481                 }
 482
 483                 cmdv[n_found++] = cmdtp->name;
 484         }
 485
 486         cmdv[n_found] = NULL;
 487         return n_found;
 488 }
 489
 490 static int make_argv(char *s, int argvsz, char *argv[])
 491 {
 492         int argc = 0;
 493
 494         /* split into argv */
 495         while (argc < argvsz - 1) {
 496
 497                 /* skip any white space */
 498                 while ((*s == ' ') || (*s == '\t'))
 499                         ++s;
 500
 501                 if (*s == '\0')         /* end of s, no more args       */
 502                         break;
 503
 504                 argv[argc++] = s;       /* begin of argument string     */
 505
 506                 /* find end of string */
 507                 while (*s && (*s != ' ') && (*s != '\t'))
 508                         ++s;
 509
 510                 if (*s == '\0')         /* end of s, no more args       */
 511                         break;
 512
 513                 *s++ = '\0';            /* terminate current arg         */
 514         }
 515         argv[argc] = NULL;
 516
 517         return argc;
 518 }
 519
 520 static void print_argv(const char *banner, const char *leader, const char *sep, int linemax, char *argv[])
 521 {
 522         int ll = leader != NULL ? strlen(leader) : 0;
 523         int sl = sep != NULL ? strlen(sep) : 0;
 524         int len, i;
 525
 526         if (banner) {
 527                 puts("\n");
 528                 puts(banner);
 529         }
 530
 531         i = linemax;    /* force leader and newline */
 532         while (*argv != NULL) {
 533                 len = strlen(*argv) + sl;
 534                 if (i + len >= linemax) {
 535                         puts("\n");
 536                         if (leader)
 537                                 puts(leader);
 538                         i = ll - sl;
 539                 } else if (sep)
 540                         puts(sep);
 541                 puts(*argv++);
 542                 i += len;
 543         }
 544         printf("\n");
 545 }
 546
 547 static int find_common_prefix(char *argv[])
 548 {
 549         int i, len;
 550         char *anchor, *s, *t;
 551
 552         if (*argv == NULL)
 553                 return 0;
 554
 555         /* begin with max */
 556         anchor = *argv++;
 557         len = strlen(anchor);
 558         while ((t = *argv++) != NULL) {
 559                 s = anchor;
 560                 for (i = 0; i < len; i++, t++, s++) {
 561                         if (*t != *s)
 562                                 break;
 563                 }
 564                 len = s - anchor;
 565         }
 566         return len;
 567 }
 568
 569 static char tmp_buf[CFG_CBSIZE];        /* copy of console I/O buffer   */
 570
 571 int cmd_auto_complete(const char *const prompt, char *buf, int *np, int *colp)
 572 {
 573         int n = *np, col = *colp;
 574         char *argv[CFG_MAXARGS + 1];            /* NULL terminated      */
 575         char *cmdv[20];
 576         char *s, *t;
 577         const char *sep;
 578         int i, j, k, len, seplen, argc;
 579         int cnt;
 580         char last_char;
 581
 582         if (strcmp(prompt, CFG_PROMPT) != 0)
 583                 return 0;       /* not in normal console */
 584
 585         cnt = strlen(buf);
 586         if (cnt >= 1)
 587                 last_char = buf[cnt - 1];
 588         else
 589                 last_char = '\0';
 590
 591         /* copy to secondary buffer which will be affected */
 592         strcpy(tmp_buf, buf);
 593
 594         /* separate into argv */
 595         argc = make_argv(tmp_buf, sizeof(argv)/sizeof(argv[0]), argv);
 596
 597         /* do the completion and return the possible completions */
 598         i = complete_cmdv(argc, argv, last_char, sizeof(cmdv)/sizeof(cmdv[0]), cmdv);
 599
 600         /* no match; bell and out */
 601         if (i == 0) {
 602                 if (argc > 1)   /* allow tab for non command */
 603                         return 0;
 604                 putc('\a');
 605                 return 1;
 606         }
 607
 608         s = NULL;
 609         len = 0;
 610         sep = NULL;
 611         seplen = 0;
 612         if (i == 1) { /* one match; perfect */
 613                 k = strlen(argv[argc - 1]);
 614                 s = cmdv[0] + k;
 615                 len = strlen(s);
 616                 sep = " ";
 617                 seplen = 1;
 618         } else if (i > 1 && (j = find_common_prefix(cmdv)) != 0) {      /* more */
 619                 k = strlen(argv[argc - 1]);
 620                 j -= k;
 621                 if (j > 0) {
 622                         s = cmdv[0] + k;
 623                         len = j;
 624                 }
 625         }
 626
 627         if (s != NULL) {
 628                 k = len + seplen;
 629                 /* make sure it fits */
 630                 if (n + k >= CFG_CBSIZE - 2) {
 631                         putc('\a');
 632                         return 1;
 633                 }
 634
 635                 t = buf + cnt;
 636                 for (i = 0; i < len; i++)
 637                         *t++ = *s++;
 638                 if (sep != NULL)
 639                         for (i = 0; i < seplen; i++)
 640                                 *t++ = sep[i];
 641                 *t = '\0';
 642                 n += k;
 643                 col += k;
 644                 puts(t - k);
 645                 if (sep == NULL)
 646                         putc('\a');
 647                 *np = n;
 648                 *colp = col;
 649         } else {
 650                 print_argv(NULL, "  ", " ", 78, cmdv);
 651
 652                 puts(prompt);
 653                 puts(buf);
 654         }
 655         return 1;
 656 }
 657
 658 #endif