common/command.c

   1 /*
   2  * (C) Copyright 2000-2009
   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 #include <linux/ctype.h>
  31
  32 /*
  33  * Use puts() instead of printf() to avoid printf buffer overflow
  34  * for long help messages
  35  */
  36
  37 int _do_help (cmd_tbl_t *cmd_start, int cmd_items, cmd_tbl_t * cmdtp, int
  38               flag, int argc, char * const argv[])
  39 {
  40         int i;
  41         int rcode = 0;
  42
  43         if (argc == 1) {        /*show list of commands */
  44                 cmd_tbl_t *cmd_array[cmd_items];
  45                 int i, j, swaps;
  46
  47                 /* Make array of commands from .uboot_cmd section */
  48                 cmdtp = cmd_start;
  49                 for (i = 0; i < cmd_items; i++) {
  50                         cmd_array[i] = cmdtp++;
  51                 }
  52
  53                 /* Sort command list (trivial bubble sort) */
  54                 for (i = cmd_items - 1; i > 0; --i) {
  55                         swaps = 0;
  56                         for (j = 0; j < i; ++j) {
  57                                 if (strcmp (cmd_array[j]->name,
  58                                             cmd_array[j + 1]->name) > 0) {
  59                                         cmd_tbl_t *tmp;
  60                                         tmp = cmd_array[j];
  61                                         cmd_array[j] = cmd_array[j + 1];
  62                                         cmd_array[j + 1] = tmp;
  63                                         ++swaps;
  64                                 }
  65                         }
  66                         if (!swaps)
  67                                 break;
  68                 }
  69
  70                 /* print short help (usage) */
  71                 for (i = 0; i < cmd_items; i++) {
  72                         const char *usage = cmd_array[i]->usage;
  73
  74                         /* allow user abort */
  75                         if (ctrlc ())
  76                                 return 1;
  77                         if (usage == NULL)
  78                                 continue;
  79                         printf("%-*s- %s\n", CONFIG_SYS_HELP_CMD_WIDTH,
  80                                cmd_array[i]->name, usage);
  81                 }
  82                 return 0;
  83         }
  84         /*
  85          * command help (long version)
  86          */
  87         for (i = 1; i < argc; ++i) {
  88                 if ((cmdtp = find_cmd_tbl (argv[i], cmd_start, cmd_items )) != NULL) {
  89                         rcode |= cmd_usage(cmdtp);
  90                 } else {
  91                         printf ("Unknown command '%s' - try 'help'"
  92                                 " without arguments for list of all"
  93                                 " known commands\n\n", argv[i]
  94                                         );
  95                         rcode = 1;
  96                 }
  97         }
  98         return rcode;
  99 }
 100
 101 /***************************************************************************
 102  * find command table entry for a command
 103  */
 104 cmd_tbl_t *find_cmd_tbl (const char *cmd, cmd_tbl_t *table, int table_len)
 105 {
 106         cmd_tbl_t *cmdtp;
 107         cmd_tbl_t *cmdtp_temp = table;  /*Init value */
 108         const char *p;
 109         int len;
 110         int n_found = 0;
 111
 112         if (!cmd)
 113                 return NULL;
 114         /*
 115          * Some commands allow length modifiers (like "cp.b");
 116          * compare command name only until first dot.
 117          */
 118         len = ((p = strchr(cmd, '.')) == NULL) ? strlen (cmd) : (p - cmd);
 119
 120         for (cmdtp = table;
 121              cmdtp != table + table_len;
 122              cmdtp++) {
 123                 if (strncmp (cmd, cmdtp->name, len) == 0) {
 124                         if (len == strlen (cmdtp->name))
 125                                 return cmdtp;   /* full match */
 126
 127                         cmdtp_temp = cmdtp;     /* abbreviated command ? */
 128                         n_found++;
 129                 }
 130         }
 131         if (n_found == 1) {                     /* exactly one match */
 132                 return cmdtp_temp;
 133         }
 134
 135         return NULL;    /* not found or ambiguous command */
 136 }
 137
 138 cmd_tbl_t *find_cmd (const char *cmd)
 139 {
 140         int len = &__u_boot_cmd_end - &__u_boot_cmd_start;
 141         return find_cmd_tbl(cmd, &__u_boot_cmd_start, len);
 142 }
 143
 144 int cmd_usage(const cmd_tbl_t *cmdtp)
 145 {
 146         printf("%s - %s\n\n", cmdtp->name, cmdtp->usage);
 147
 148 #ifdef  CONFIG_SYS_LONGHELP
 149         printf("Usage:\n%s ", cmdtp->name);
 150
 151         if (!cmdtp->help) {
 152                 puts ("- No additional help available.\n");
 153                 return 1;
 154         }
 155
 156         puts (cmdtp->help);
 157         putc ('\n');
 158 #endif  /* CONFIG_SYS_LONGHELP */
 159         return 1;
 160 }
 161
 162 #ifdef CONFIG_AUTO_COMPLETE
 163
 164 int var_complete(int argc, char * const argv[], char last_char, int maxv, char *cmdv[])
 165 {
 166         static char tmp_buf[512];
 167         int space;
 168
 169         space = last_char == '\0' || isblank(last_char);
 170
 171         if (space && argc == 1)
 172                 return env_complete("", maxv, cmdv, sizeof(tmp_buf), tmp_buf);
 173
 174         if (!space && argc == 2)
 175                 return env_complete(argv[1], maxv, cmdv, sizeof(tmp_buf), tmp_buf);
 176
 177         return 0;
 178 }
 179
 180 /*************************************************************************************/
 181
 182 static int complete_cmdv(int argc, char * const argv[], char last_char, int maxv, char *cmdv[])
 183 {
 184         cmd_tbl_t *cmdtp;
 185         const char *p;
 186         int len, clen;
 187         int n_found = 0;
 188         const char *cmd;
 189
 190         /* sanity? */
 191         if (maxv < 2)
 192                 return -2;
 193
 194         cmdv[0] = NULL;
 195
 196         if (argc == 0) {
 197                 /* output full list of commands */
 198                 for (cmdtp = &__u_boot_cmd_start; cmdtp != &__u_boot_cmd_end; cmdtp++) {
 199                         if (n_found >= maxv - 2) {
 200                                 cmdv[n_found++] = "...";
 201                                 break;
 202                         }
 203                         cmdv[n_found++] = cmdtp->name;
 204                 }
 205                 cmdv[n_found] = NULL;
 206                 return n_found;
 207         }
 208
 209         /* more than one arg or one but the start of the next */
 210         if (argc > 1 || (last_char == '\0' || isblank(last_char))) {
 211                 cmdtp = find_cmd(argv[0]);
 212                 if (cmdtp == NULL || cmdtp->complete == NULL) {
 213                         cmdv[0] = NULL;
 214                         return 0;
 215                 }
 216                 return (*cmdtp->complete)(argc, argv, last_char, maxv, cmdv);
 217         }
 218
 219         cmd = argv[0];
 220         /*
 221          * Some commands allow length modifiers (like "cp.b");
 222          * compare command name only until first dot.
 223          */
 224         p = strchr(cmd, '.');
 225         if (p == NULL)
 226                 len = strlen(cmd);
 227         else
 228                 len = p - cmd;
 229
 230         /* return the partial matches */
 231         for (cmdtp = &__u_boot_cmd_start; cmdtp != &__u_boot_cmd_end; cmdtp++) {
 232
 233                 clen = strlen(cmdtp->name);
 234                 if (clen < len)
 235                         continue;
 236
 237                 if (memcmp(cmd, cmdtp->name, len) != 0)
 238                         continue;
 239
 240                 /* too many! */
 241                 if (n_found >= maxv - 2) {
 242                         cmdv[n_found++] = "...";
 243                         break;
 244                 }
 245
 246                 cmdv[n_found++] = cmdtp->name;
 247         }
 248
 249         cmdv[n_found] = NULL;
 250         return n_found;
 251 }
 252
 253 static int make_argv(char *s, int argvsz, char *argv[])
 254 {
 255         int argc = 0;
 256
 257         /* split into argv */
 258         while (argc < argvsz - 1) {
 259
 260                 /* skip any white space */
 261                 while (isblank(*s))
 262                         ++s;
 263
 264                 if (*s == '\0') /* end of s, no more args       */
 265                         break;
 266
 267                 argv[argc++] = s;       /* begin of argument string     */
 268
 269                 /* find end of string */
 270                 while (*s && !isblank(*s))
 271                         ++s;
 272
 273                 if (*s == '\0')         /* end of s, no more args       */
 274                         break;
 275
 276                 *s++ = '\0';            /* terminate current arg         */
 277         }
 278         argv[argc] = NULL;
 279
 280         return argc;
 281 }
 282
 283 static void print_argv(const char *banner, const char *leader, const char *sep, int linemax, char * const argv[])
 284 {
 285         int ll = leader != NULL ? strlen(leader) : 0;
 286         int sl = sep != NULL ? strlen(sep) : 0;
 287         int len, i;
 288
 289         if (banner) {
 290                 puts("\n");
 291                 puts(banner);
 292         }
 293
 294         i = linemax;    /* force leader and newline */
 295         while (*argv != NULL) {
 296                 len = strlen(*argv) + sl;
 297                 if (i + len >= linemax) {
 298                         puts("\n");
 299                         if (leader)
 300                                 puts(leader);
 301                         i = ll - sl;
 302                 } else if (sep)
 303                         puts(sep);
 304                 puts(*argv++);
 305                 i += len;
 306         }
 307         printf("\n");
 308 }
 309
 310 static int find_common_prefix(char * const argv[])
 311 {
 312         int i, len;
 313         char *anchor, *s, *t;
 314
 315         if (*argv == NULL)
 316                 return 0;
 317
 318         /* begin with max */
 319         anchor = *argv++;
 320         len = strlen(anchor);
 321         while ((t = *argv++) != NULL) {
 322                 s = anchor;
 323                 for (i = 0; i < len; i++, t++, s++) {
 324                         if (*t != *s)
 325                                 break;
 326                 }
 327                 len = s - anchor;
 328         }
 329         return len;
 330 }
 331
 332 static char tmp_buf[CONFIG_SYS_CBSIZE]; /* copy of console I/O buffer   */
 333
 334 int cmd_auto_complete(const char *const prompt, char *buf, int *np, int *colp)
 335 {
 336         int n = *np, col = *colp;
 337         char *argv[CONFIG_SYS_MAXARGS + 1];             /* NULL terminated      */
 338         char *cmdv[20];
 339         char *s, *t;
 340         const char *sep;
 341         int i, j, k, len, seplen, argc;
 342         int cnt;
 343         char last_char;
 344
 345         if (strcmp(prompt, CONFIG_SYS_PROMPT) != 0)
 346                 return 0;       /* not in normal console */
 347
 348         cnt = strlen(buf);
 349         if (cnt >= 1)
 350                 last_char = buf[cnt - 1];
 351         else
 352                 last_char = '\0';
 353
 354         /* copy to secondary buffer which will be affected */
 355         strcpy(tmp_buf, buf);
 356
 357         /* separate into argv */
 358         argc = make_argv(tmp_buf, sizeof(argv)/sizeof(argv[0]), argv);
 359
 360         /* do the completion and return the possible completions */
 361         i = complete_cmdv(argc, argv, last_char, sizeof(cmdv)/sizeof(cmdv[0]), cmdv);
 362
 363         /* no match; bell and out */
 364         if (i == 0) {
 365                 if (argc > 1)   /* allow tab for non command */
 366                         return 0;
 367                 putc('\a');
 368                 return 1;
 369         }
 370
 371         s = NULL;
 372         len = 0;
 373         sep = NULL;
 374         seplen = 0;
 375         if (i == 1) { /* one match; perfect */
 376                 k = strlen(argv[argc - 1]);
 377                 s = cmdv[0] + k;
 378                 len = strlen(s);
 379                 sep = " ";
 380                 seplen = 1;
 381         } else if (i > 1 && (j = find_common_prefix(cmdv)) != 0) {      /* more */
 382                 k = strlen(argv[argc - 1]);
 383                 j -= k;
 384                 if (j > 0) {
 385                         s = cmdv[0] + k;
 386                         len = j;
 387                 }
 388         }
 389
 390         if (s != NULL) {
 391                 k = len + seplen;
 392                 /* make sure it fits */
 393                 if (n + k >= CONFIG_SYS_CBSIZE - 2) {
 394                         putc('\a');
 395                         return 1;
 396                 }
 397
 398                 t = buf + cnt;
 399                 for (i = 0; i < len; i++)
 400                         *t++ = *s++;
 401                 if (sep != NULL)
 402                         for (i = 0; i < seplen; i++)
 403                                 *t++ = sep[i];
 404                 *t = '\0';
 405                 n += k;
 406                 col += k;
 407                 puts(t - k);
 408                 if (sep == NULL)
 409                         putc('\a');
 410                 *np = n;
 411                 *colp = col;
 412         } else {
 413                 print_argv(NULL, "  ", " ", 78, cmdv);
 414
 415                 puts(prompt);
 416                 puts(buf);
 417         }
 418         return 1;
 419 }
 420
 421 #endif
 422
 423 #ifdef CMD_DATA_SIZE
 424 int cmd_get_data_size(char* arg, int default_size)
 425 {
 426         /* Check for a size specification .b, .w or .l.
 427          */
 428         int len = strlen(arg);
 429         if (len > 2 && arg[len-2] == '.') {
 430                 switch(arg[len-1]) {
 431                 case 'b':
 432                         return 1;
 433                 case 'w':
 434                         return 2;
 435                 case 'l':
 436                         return 4;
 437                 case 's':
 438                         return -2;
 439                 default:
 440                         return -1;
 441                 }
 442         }
 443         return default_size;
 444 }
 445 #endif
 446
 447 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 448 DECLARE_GLOBAL_DATA_PTR;
 449
 450 void fixup_cmdtable(cmd_tbl_t *cmdtp, int size)
 451 {
 452         int     i;
 453
 454         if (gd->reloc_off == 0)
 455                 return;
 456
 457         for (i = 0; i < size; i++) {
 458                 ulong addr;
 459
 460                 addr = (ulong) (cmdtp->cmd) + gd->reloc_off;
 461 #if DEBUG_COMMANDS
 462                 printf("Command \"%s\": 0x%08lx => 0x%08lx\n",
 463                        cmdtp->name, (ulong) (cmdtp->cmd), addr);
 464 #endif
 465                 cmdtp->cmd =
 466                         (int (*)(struct cmd_tbl_s *, int, int, char * const []))addr;
 467                 addr = (ulong)(cmdtp->name) + gd->reloc_off;
 468                 cmdtp->name = (char *)addr;
 469                 if (cmdtp->usage) {
 470                         addr = (ulong)(cmdtp->usage) + gd->reloc_off;
 471                         cmdtp->usage = (char *)addr;
 472                 }
 473 #ifdef  CONFIG_SYS_LONGHELP
 474                 if (cmdtp->help) {
 475                         addr = (ulong)(cmdtp->help) + gd->reloc_off;
 476                         cmdtp->help = (char *)addr;
 477                 }
 478 #endif
 479 #ifdef CONFIG_AUTO_COMPLETE
 480                 if (cmdtp->complete) {
 481                         addr = (ulong)(cmdtp->complete) + gd->reloc_off;
 482                         cmdtp->complete = (char *)addr;
 483                 }
 484 #endif
 485                 cmdtp++;
 486         }
 487 }
 488 #endif