cmd.c

   1 /*
   2  * Copyright (c) 2003-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <ctype.h>
  22 #include <errno.h>
  23 #include <sys/time.h>
  24
  25 #include "cmd.h"
  26
  27 #define _(x)    x       /* not gettext support yet */
  28
  29 extern int optind;
  30
  31 /* from libxcmd/command.c */
  32
  33 cmdinfo_t       *cmdtab;
  34 int             ncmds;
  35
  36 static argsfunc_t       args_func;
  37 static checkfunc_t      check_func;
  38 static int              ncmdline;
  39 static char             **cmdline;
  40
  41 static int
  42 compare(const void *a, const void *b)
  43 {
  44         return strcmp(((const cmdinfo_t *)a)->name,
  45                       ((const cmdinfo_t *)b)->name);
  46 }
  47
  48 void
  49 add_command(
  50         const cmdinfo_t *ci)
  51 {
  52         cmdtab = realloc((void *)cmdtab, ++ncmds * sizeof(*cmdtab));
  53         cmdtab[ncmds - 1] = *ci;
  54         qsort(cmdtab, ncmds, sizeof(*cmdtab), compare);
  55 }
  56
  57 static int
  58 check_command(
  59         const cmdinfo_t *ci)
  60 {
  61         if (check_func)
  62                 return check_func(ci);
  63         return 1;
  64 }
  65
  66 void
  67 add_check_command(
  68         checkfunc_t     cf)
  69 {
  70         check_func = cf;
  71 }
  72
  73 int
  74 command_usage(
  75         const cmdinfo_t *ci)
  76 {
  77         printf("%s %s -- %s\n", ci->name, ci->args, ci->oneline);
  78         return 0;
  79 }
  80
  81 int
  82 command(
  83         const cmdinfo_t *ct,
  84         int             argc,
  85         char            **argv)
  86 {
  87         char            *cmd = argv[0];
  88
  89         if (!check_command(ct))
  90                 return 0;
  91
  92         if (argc-1 < ct->argmin || (ct->argmax != -1 && argc-1 > ct->argmax)) {
  93                 if (ct->argmax == -1)
  94                         fprintf(stderr,
  95         _("bad argument count %d to %s, expected at least %d arguments\n"),
  96                                 argc-1, cmd, ct->argmin);
  97                 else if (ct->argmin == ct->argmax)
  98                         fprintf(stderr,
  99         _("bad argument count %d to %s, expected %d arguments\n"),
 100                                 argc-1, cmd, ct->argmin);
 101                 else
 102                         fprintf(stderr,
 103         _("bad argument count %d to %s, expected between %d and %d arguments\n"),
 104                         argc-1, cmd, ct->argmin, ct->argmax);
 105                 return 0;
 106         }
 107         optind = 0;
 108         return ct->cfunc(argc, argv);
 109 }
 110
 111 const cmdinfo_t *
 112 find_command(
 113         const char      *cmd)
 114 {
 115         cmdinfo_t       *ct;
 116
 117         for (ct = cmdtab; ct < &cmdtab[ncmds]; ct++) {
 118                 if (strcmp(ct->name, cmd) == 0 ||
 119                     (ct->altname && strcmp(ct->altname, cmd) == 0))
 120                         return (const cmdinfo_t *)ct;
 121         }
 122         return NULL;
 123 }
 124
 125 void
 126 add_user_command(char *optarg)
 127 {
 128         ncmdline++;
 129         cmdline = realloc(cmdline, sizeof(char*) * (ncmdline));
 130         if (!cmdline) {
 131                 perror("realloc");
 132                 exit(1);
 133         }
 134         cmdline[ncmdline-1] = optarg;
 135 }
 136
 137 static int
 138 args_command(
 139         int     index)
 140 {
 141         if (args_func)
 142                 return args_func(index);
 143         return 0;
 144 }
 145
 146 void
 147 add_args_command(
 148         argsfunc_t      af)
 149 {
 150         args_func = af;
 151 }
 152
 153 void
 154 command_loop(void)
 155 {
 156         int             c, i, j = 0, done = 0;
 157         char            *input;
 158         char            **v;
 159         const cmdinfo_t *ct;
 160
 161         for (i = 0; !done && i < ncmdline; i++) {
 162                 input = strdup(cmdline[i]);
 163                 if (!input) {
 164                         fprintf(stderr,
 165                                 _("cannot strdup command '%s': %s\n"),
 166                                 cmdline[i], strerror(errno));
 167                         exit(1);
 168                 }
 169                 v = breakline(input, &c);
 170                 if (c) {
 171                         ct = find_command(v[0]);
 172                         if (ct) {
 173                                 if (ct->flags & CMD_FLAG_GLOBAL)
 174                                         done = command(ct, c, v);
 175                                 else {
 176                                         j = 0;
 177                                         while (!done && (j = args_command(j)))
 178                                                 done = command(ct, c, v);
 179                                 }
 180                         } else
 181                                 fprintf(stderr, _("command \"%s\" not found\n"),
 182                                         v[0]);
 183                 }
 184                 doneline(input, v);
 185         }
 186         if (cmdline) {
 187                 free(cmdline);
 188                 return;
 189         }
 190         while (!done) {
 191                 if ((input = fetchline()) == NULL)
 192                         break;
 193                 v = breakline(input, &c);
 194                 if (c) {
 195                         ct = find_command(v[0]);
 196                         if (ct)
 197                                 done = command(ct, c, v);
 198                         else
 199                                 fprintf(stderr, _("command \"%s\" not found\n"),
 200                                         v[0]);
 201                 }
 202                 doneline(input, v);
 203         }
 204 }
 205
 206 /* from libxcmd/input.c */
 207
 208 #if defined(ENABLE_READLINE)
 209 # include <readline/history.h>
 210 # include <readline/readline.h>
 211 #elif defined(ENABLE_EDITLINE)
 212 # include <histedit.h>
 213 #endif
 214
 215 static char *
 216 get_prompt(void)
 217 {
 218         static char     prompt[FILENAME_MAX + 2 /*"> "*/ + 1 /*"\0"*/ ];
 219
 220         if (!prompt[0])
 221                 snprintf(prompt, sizeof(prompt), "%s> ", progname);
 222         return prompt;
 223 }
 224
 225 #if defined(ENABLE_READLINE)
 226 char *
 227 fetchline(void)
 228 {
 229         char    *line;
 230
 231         line = readline(get_prompt());
 232         if (line && *line)
 233                 add_history(line);
 234         return line;
 235 }
 236 #elif defined(ENABLE_EDITLINE)
 237 static char *el_get_prompt(EditLine *e) { return get_prompt(); }
 238 char *
 239 fetchline(void)
 240 {
 241         static EditLine *el;
 242         static History  *hist;
 243         HistEvent       hevent;
 244         char            *line;
 245         int             count;
 246
 247         if (!el) {
 248                 hist = history_init();
 249                 history(hist, &hevent, H_SETSIZE, 100);
 250                 el = el_init(progname, stdin, stdout, stderr);
 251                 el_source(el, NULL);
 252                 el_set(el, EL_SIGNAL, 1);
 253                 el_set(el, EL_PROMPT, el_get_prompt);
 254                 el_set(el, EL_HIST, history, (const char *)hist);
 255         }
 256         line = strdup(el_gets(el, &count));
 257         if (line) {
 258                 if (count > 0)
 259                         line[count-1] = '\0';
 260                 if (*line)
 261                         history(hist, &hevent, H_ENTER, line);
 262         }
 263         return line;
 264 }
 265 #else
 266 # define MAXREADLINESZ  1024
 267 char *
 268 fetchline(void)
 269 {
 270         char    *p, *line = malloc(MAXREADLINESZ);
 271
 272         if (!line)
 273                 return NULL;
 274         printf("%s", get_prompt());
 275         fflush(stdout);
 276         if (!fgets(line, MAXREADLINESZ, stdin)) {
 277                 free(line);
 278                 return NULL;
 279         }
 280         p = line + strlen(line);
 281         if (p != line && p[-1] == '\n')
 282                 p[-1] = '\0';
 283         return line;
 284 }
 285 #endif
 286
 287 static char *qemu_strsep(char **input, const char *delim)
 288 {
 289     char *result = *input;
 290     if (result != NULL) {
 291     char *p = result;
 292     for (p = result; *p != '\0'; p++) {
 293         if (strchr(delim, *p)) {
 294                 break;
 295             }
 296         }
 297         if (*p == '\0') {
 298             *input = NULL;
 299         } else {
 300             *p = '\0';
 301             *input = p + 1;
 302         }
 303     }
 304     return result;
 305 }
 306
 307 char **
 308 breakline(
 309         char    *input,
 310         int     *count)
 311 {
 312         int     c = 0;
 313         char    *p;
 314         char    **rval = calloc(sizeof(char *), 1);
 315
 316         while (rval && (p = qemu_strsep(&input, " ")) != NULL) {
 317                 if (!*p)
 318                         continue;
 319                 c++;
 320                 rval = realloc(rval, sizeof(*rval) * (c + 1));
 321                 if (!rval) {
 322                         c = 0;
 323                         break;
 324                 }
 325                 rval[c - 1] = p;
 326                 rval[c] = NULL;
 327         }
 328         *count = c;
 329         return rval;
 330 }
 331
 332 void
 333 doneline(
 334         char    *input,
 335         char    **vec)
 336 {
 337         free(input);
 338         free(vec);
 339 }
 340
 341 #define EXABYTES(x)     ((long long)(x) << 60)
 342 #define PETABYTES(x)    ((long long)(x) << 50)
 343 #define TERABYTES(x)    ((long long)(x) << 40)
 344 #define GIGABYTES(x)    ((long long)(x) << 30)
 345 #define MEGABYTES(x)    ((long long)(x) << 20)
 346 #define KILOBYTES(x)    ((long long)(x) << 10)
 347
 348 long long
 349 cvtnum(
 350         char            *s)
 351 {
 352         long long       i;
 353         char            *sp;
 354         int             c;
 355
 356         i = strtoll(s, &sp, 0);
 357         if (i == 0 && sp == s)
 358                 return -1LL;
 359         if (*sp == '\0')
 360                 return i;
 361
 362         if (sp[1] != '\0')
 363                 return -1LL;
 364
 365         c = tolower(*sp);
 366         switch (c) {
 367         default:
 368                 return i;
 369         case 'k':
 370                 return KILOBYTES(i);
 371         case 'm':
 372                 return MEGABYTES(i);
 373         case 'g':
 374                 return GIGABYTES(i);
 375         case 't':
 376                 return TERABYTES(i);
 377         case 'p':
 378                 return PETABYTES(i);
 379         case 'e':
 380                 return  EXABYTES(i);
 381         }
 382         return -1LL;
 383 }
 384
 385 #define TO_EXABYTES(x)  ((x) / EXABYTES(1))
 386 #define TO_PETABYTES(x) ((x) / PETABYTES(1))
 387 #define TO_TERABYTES(x) ((x) / TERABYTES(1))
 388 #define TO_GIGABYTES(x) ((x) / GIGABYTES(1))
 389 #define TO_MEGABYTES(x) ((x) / MEGABYTES(1))
 390 #define TO_KILOBYTES(x) ((x) / KILOBYTES(1))
 391
 392 void
 393 cvtstr(
 394         double          value,
 395         char            *str,
 396         size_t          size)
 397 {
 398         const char      *fmt;
 399         int             precise;
 400
 401         precise = ((double)value * 1000 == (double)(int)value * 1000);
 402
 403         if (value >= EXABYTES(1)) {
 404                 fmt = precise ? "%.f EiB" : "%.3f EiB";
 405                 snprintf(str, size, fmt, TO_EXABYTES(value));
 406         } else if (value >= PETABYTES(1)) {
 407                 fmt = precise ? "%.f PiB" : "%.3f PiB";
 408                 snprintf(str, size, fmt, TO_PETABYTES(value));
 409         } else if (value >= TERABYTES(1)) {
 410                 fmt = precise ? "%.f TiB" : "%.3f TiB";
 411                 snprintf(str, size, fmt, TO_TERABYTES(value));
 412         } else if (value >= GIGABYTES(1)) {
 413                 fmt = precise ? "%.f GiB" : "%.3f GiB";
 414                 snprintf(str, size, fmt, TO_GIGABYTES(value));
 415         } else if (value >= MEGABYTES(1)) {
 416                 fmt = precise ? "%.f MiB" : "%.3f MiB";
 417                 snprintf(str, size, fmt, TO_MEGABYTES(value));
 418         } else if (value >= KILOBYTES(1)) {
 419                 fmt = precise ? "%.f KiB" : "%.3f KiB";
 420                 snprintf(str, size, fmt, TO_KILOBYTES(value));
 421         } else {
 422                 snprintf(str, size, "%f bytes", value);
 423         }
 424 }
 425
 426 struct timeval
 427 tsub(struct timeval t1, struct timeval t2)
 428 {
 429         t1.tv_usec -= t2.tv_usec;
 430         if (t1.tv_usec < 0) {
 431                 t1.tv_usec += 1000000;
 432                 t1.tv_sec--;
 433         }
 434         t1.tv_sec -= t2.tv_sec;
 435         return t1;
 436 }
 437
 438 double
 439 tdiv(double value, struct timeval tv)
 440 {
 441         return value / ((double)tv.tv_sec + ((double)tv.tv_usec / 1000000.0));
 442 }
 443
 444 #define HOURS(sec)      ((sec) / (60 * 60))
 445 #define MINUTES(sec)    (((sec) % (60 * 60)) / 60)
 446 #define SECONDS(sec)    ((sec) % 60)
 447
 448 void
 449 timestr(
 450         struct timeval  *tv,
 451         char            *ts,
 452         size_t          size,
 453         int             format)
 454 {
 455         double          usec = (double)tv->tv_usec / 1000000.0;
 456
 457         if (format & TERSE_FIXED_TIME) {
 458                 if (!HOURS(tv->tv_sec)) {
 459                         snprintf(ts, size, "%u:%02u.%02u",
 460                                 (unsigned int) MINUTES(tv->tv_sec),
 461                                 (unsigned int) SECONDS(tv->tv_sec),
 462                                 (unsigned int) usec * 100);
 463                         return;
 464                 }
 465                 format |= VERBOSE_FIXED_TIME;   /* fallback if hours needed */
 466         }
 467
 468         if ((format & VERBOSE_FIXED_TIME) || tv->tv_sec) {
 469                 snprintf(ts, size, "%u:%02u:%02u.%02u",
 470                         (unsigned int) HOURS(tv->tv_sec),
 471                         (unsigned int) MINUTES(tv->tv_sec),
 472                         (unsigned int) SECONDS(tv->tv_sec),
 473                         (unsigned int) usec * 100);
 474         } else {
 475                 snprintf(ts, size, "0.%04u sec", (unsigned int) usec * 10000);
 476         }
 477 }
 478
 479
 480 /* from libxcmd/quit.c */
 481
 482 static cmdinfo_t quit_cmd;
 483
 484 /* ARGSUSED */
 485 static int
 486 quit_f(
 487         int     argc,
 488         char    **argv)
 489 {
 490         return 1;
 491 }
 492
 493 void
 494 quit_init(void)
 495 {
 496         quit_cmd.name = _("quit");
 497         quit_cmd.altname = _("q");
 498         quit_cmd.cfunc = quit_f;
 499         quit_cmd.argmin = -1;
 500         quit_cmd.argmax = -1;
 501         quit_cmd.flags = CMD_FLAG_GLOBAL;
 502         quit_cmd.oneline = _("exit the program");
 503
 504         add_command(&quit_cmd);
 505 }
 506
 507 /* from libxcmd/help.c */
 508
 509 static cmdinfo_t help_cmd;
 510 static void help_onecmd(const char *cmd, const cmdinfo_t *ct);
 511 static void help_oneline(const char *cmd, const cmdinfo_t *ct);
 512
 513 static void
 514 help_all(void)
 515 {
 516         const cmdinfo_t *ct;
 517
 518         for (ct = cmdtab; ct < &cmdtab[ncmds]; ct++)
 519                 help_oneline(ct->name, ct);
 520         printf(_("\nUse 'help commandname' for extended help.\n"));
 521 }
 522
 523 static int
 524 help_f(
 525         int             argc,
 526         char            **argv)
 527 {
 528         const cmdinfo_t *ct;
 529
 530         if (argc == 1) {
 531                 help_all();
 532                 return 0;
 533         }
 534         ct = find_command(argv[1]);
 535         if (ct == NULL) {
 536                 printf(_("command %s not found\n"), argv[1]);
 537                 return 0;
 538         }
 539         help_onecmd(argv[1], ct);
 540         return 0;
 541 }
 542
 543 static void
 544 help_onecmd(
 545         const char      *cmd,
 546         const cmdinfo_t *ct)
 547 {
 548         help_oneline(cmd, ct);
 549         if (ct->help)
 550                 ct->help();
 551 }
 552
 553 static void
 554 help_oneline(
 555         const char      *cmd,
 556         const cmdinfo_t *ct)
 557 {
 558         if (cmd)
 559                 printf("%s ", cmd);
 560         else {
 561                 printf("%s ", ct->name);
 562                 if (ct->altname)
 563                         printf("(or %s) ", ct->altname);
 564         }
 565         if (ct->args)
 566                 printf("%s ", ct->args);
 567         printf("-- %s\n", ct->oneline);
 568 }
 569
 570 void
 571 help_init(void)
 572 {
 573         help_cmd.name = _("help");
 574         help_cmd.altname = _("?");
 575         help_cmd.cfunc = help_f;
 576         help_cmd.argmin = 0;
 577         help_cmd.argmax = 1;
 578         help_cmd.flags = CMD_FLAG_GLOBAL;
 579         help_cmd.args = _("[command]");
 580         help_cmd.oneline = _("help for one or all commands");
 581
 582         add_command(&help_cmd);
 583 }