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