tools/perf/util/parse-options.c

   1 #include "util.h"
   2 #include "parse-options.h"
   3 #include "cache.h"
   4 #include "header.h"
   5
   6 #define OPT_SHORT 1
   7 #define OPT_UNSET 2
   8
   9 static int opterror(const struct option *opt, const char *reason, int flags)
  10 {
  11         if (flags & OPT_SHORT)
  12                 return error("switch `%c' %s", opt->short_name, reason);
  13         if (flags & OPT_UNSET)
  14                 return error("option `no-%s' %s", opt->long_name, reason);
  15         return error("option `%s' %s", opt->long_name, reason);
  16 }
  17
  18 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
  19                    int flags, const char **arg)
  20 {
  21         if (p->opt) {
  22                 *arg = p->opt;
  23                 p->opt = NULL;
  24         } else if ((opt->flags & PARSE_OPT_LASTARG_DEFAULT) && (p->argc == 1 ||
  25                     **(p->argv + 1) == '-')) {
  26                 *arg = (const char *)opt->defval;
  27         } else if (p->argc > 1) {
  28                 p->argc--;
  29                 *arg = *++p->argv;
  30         } else
  31                 return opterror(opt, "requires a value", flags);
  32         return 0;
  33 }
  34
  35 static int get_value(struct parse_opt_ctx_t *p,
  36                      const struct option *opt, int flags)
  37 {
  38         const char *s, *arg = NULL;
  39         const int unset = flags & OPT_UNSET;
  40
  41         if (unset && p->opt)
  42                 return opterror(opt, "takes no value", flags);
  43         if (unset && (opt->flags & PARSE_OPT_NONEG))
  44                 return opterror(opt, "isn't available", flags);
  45
  46         if (!(flags & OPT_SHORT) && p->opt) {
  47                 switch (opt->type) {
  48                 case OPTION_CALLBACK:
  49                         if (!(opt->flags & PARSE_OPT_NOARG))
  50                                 break;
  51                         /* FALLTHROUGH */
  52                 case OPTION_BOOLEAN:
  53                 case OPTION_INCR:
  54                 case OPTION_BIT:
  55                 case OPTION_SET_UINT:
  56                 case OPTION_SET_PTR:
  57                         return opterror(opt, "takes no value", flags);
  58                 case OPTION_END:
  59                 case OPTION_ARGUMENT:
  60                 case OPTION_GROUP:
  61                 case OPTION_STRING:
  62                 case OPTION_INTEGER:
  63                 case OPTION_UINTEGER:
  64                 case OPTION_LONG:
  65                 case OPTION_U64:
  66                 default:
  67                         break;
  68                 }
  69         }
  70
  71         switch (opt->type) {
  72         case OPTION_BIT:
  73                 if (unset)
  74                         *(int *)opt->value &= ~opt->defval;
  75                 else
  76                         *(int *)opt->value |= opt->defval;
  77                 return 0;
  78
  79         case OPTION_BOOLEAN:
  80                 *(bool *)opt->value = unset ? false : true;
  81                 if (opt->set)
  82                         *(bool *)opt->set = true;
  83                 return 0;
  84
  85         case OPTION_INCR:
  86                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
  87                 return 0;
  88
  89         case OPTION_SET_UINT:
  90                 *(unsigned int *)opt->value = unset ? 0 : opt->defval;
  91                 return 0;
  92
  93         case OPTION_SET_PTR:
  94                 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
  95                 return 0;
  96
  97         case OPTION_STRING:
  98                 if (unset)
  99                         *(const char **)opt->value = NULL;
 100                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 101                         *(const char **)opt->value = (const char *)opt->defval;
 102                 else
 103                         return get_arg(p, opt, flags, (const char **)opt->value);
 104                 return 0;
 105
 106         case OPTION_CALLBACK:
 107                 if (unset)
 108                         return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 109                 if (opt->flags & PARSE_OPT_NOARG)
 110                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 111                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 112                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 113                 if (get_arg(p, opt, flags, &arg))
 114                         return -1;
 115                 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 116
 117         case OPTION_INTEGER:
 118                 if (unset) {
 119                         *(int *)opt->value = 0;
 120                         return 0;
 121                 }
 122                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 123                         *(int *)opt->value = opt->defval;
 124                         return 0;
 125                 }
 126                 if (get_arg(p, opt, flags, &arg))
 127                         return -1;
 128                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 129                 if (*s)
 130                         return opterror(opt, "expects a numerical value", flags);
 131                 return 0;
 132
 133         case OPTION_UINTEGER:
 134                 if (unset) {
 135                         *(unsigned int *)opt->value = 0;
 136                         return 0;
 137                 }
 138                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 139                         *(unsigned int *)opt->value = opt->defval;
 140                         return 0;
 141                 }
 142                 if (get_arg(p, opt, flags, &arg))
 143                         return -1;
 144                 *(unsigned int *)opt->value = strtol(arg, (char **)&s, 10);
 145                 if (*s)
 146                         return opterror(opt, "expects a numerical value", flags);
 147                 return 0;
 148
 149         case OPTION_LONG:
 150                 if (unset) {
 151                         *(long *)opt->value = 0;
 152                         return 0;
 153                 }
 154                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 155                         *(long *)opt->value = opt->defval;
 156                         return 0;
 157                 }
 158                 if (get_arg(p, opt, flags, &arg))
 159                         return -1;
 160                 *(long *)opt->value = strtol(arg, (char **)&s, 10);
 161                 if (*s)
 162                         return opterror(opt, "expects a numerical value", flags);
 163                 return 0;
 164
 165         case OPTION_U64:
 166                 if (unset) {
 167                         *(u64 *)opt->value = 0;
 168                         return 0;
 169                 }
 170                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 171                         *(u64 *)opt->value = opt->defval;
 172                         return 0;
 173                 }
 174                 if (get_arg(p, opt, flags, &arg))
 175                         return -1;
 176                 *(u64 *)opt->value = strtoull(arg, (char **)&s, 10);
 177                 if (*s)
 178                         return opterror(opt, "expects a numerical value", flags);
 179                 return 0;
 180
 181         case OPTION_END:
 182         case OPTION_ARGUMENT:
 183         case OPTION_GROUP:
 184         default:
 185                 die("should not happen, someone must be hit on the forehead");
 186         }
 187 }
 188
 189 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 190 {
 191         for (; options->type != OPTION_END; options++) {
 192                 if (options->short_name == *p->opt) {
 193                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 194                         return get_value(p, options, OPT_SHORT);
 195                 }
 196         }
 197         return -2;
 198 }
 199
 200 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 201                           const struct option *options)
 202 {
 203         const char *arg_end = strchr(arg, '=');
 204         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 205         int abbrev_flags = 0, ambiguous_flags = 0;
 206
 207         if (!arg_end)
 208                 arg_end = arg + strlen(arg);
 209
 210         for (; options->type != OPTION_END; options++) {
 211                 const char *rest;
 212                 int flags = 0;
 213
 214                 if (!options->long_name)
 215                         continue;
 216
 217                 rest = skip_prefix(arg, options->long_name);
 218                 if (options->type == OPTION_ARGUMENT) {
 219                         if (!rest)
 220                                 continue;
 221                         if (*rest == '=')
 222                                 return opterror(options, "takes no value", flags);
 223                         if (*rest)
 224                                 continue;
 225                         p->out[p->cpidx++] = arg - 2;
 226                         return 0;
 227                 }
 228                 if (!rest) {
 229                         if (!prefixcmp(options->long_name, "no-")) {
 230                                 /*
 231                                  * The long name itself starts with "no-", so
 232                                  * accept the option without "no-" so that users
 233                                  * do not have to enter "no-no-" to get the
 234                                  * negation.
 235                                  */
 236                                 rest = skip_prefix(arg, options->long_name + 3);
 237                                 if (rest) {
 238                                         flags |= OPT_UNSET;
 239                                         goto match;
 240                                 }
 241                                 /* Abbreviated case */
 242                                 if (!prefixcmp(options->long_name + 3, arg)) {
 243                                         flags |= OPT_UNSET;
 244                                         goto is_abbreviated;
 245                                 }
 246                         }
 247                         /* abbreviated? */
 248                         if (!strncmp(options->long_name, arg, arg_end - arg)) {
 249 is_abbreviated:
 250                                 if (abbrev_option) {
 251                                         /*
 252                                          * If this is abbreviated, it is
 253                                          * ambiguous. So when there is no
 254                                          * exact match later, we need to
 255                                          * error out.
 256                                          */
 257                                         ambiguous_option = abbrev_option;
 258                                         ambiguous_flags = abbrev_flags;
 259                                 }
 260                                 if (!(flags & OPT_UNSET) && *arg_end)
 261                                         p->opt = arg_end + 1;
 262                                 abbrev_option = options;
 263                                 abbrev_flags = flags;
 264                                 continue;
 265                         }
 266                         /* negated and abbreviated very much? */
 267                         if (!prefixcmp("no-", arg)) {
 268                                 flags |= OPT_UNSET;
 269                                 goto is_abbreviated;
 270                         }
 271                         /* negated? */
 272                         if (strncmp(arg, "no-", 3))
 273                                 continue;
 274                         flags |= OPT_UNSET;
 275                         rest = skip_prefix(arg + 3, options->long_name);
 276                         /* abbreviated and negated? */
 277                         if (!rest && !prefixcmp(options->long_name, arg + 3))
 278                                 goto is_abbreviated;
 279                         if (!rest)
 280                                 continue;
 281                 }
 282 match:
 283                 if (*rest) {
 284                         if (*rest != '=')
 285                                 continue;
 286                         p->opt = rest + 1;
 287                 }
 288                 return get_value(p, options, flags);
 289         }
 290
 291         if (ambiguous_option)
 292                 return error("Ambiguous option: %s "
 293                         "(could be --%s%s or --%s%s)",
 294                         arg,
 295                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 296                         ambiguous_option->long_name,
 297                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 298                         abbrev_option->long_name);
 299         if (abbrev_option)
 300                 return get_value(p, abbrev_option, abbrev_flags);
 301         return -2;
 302 }
 303
 304 static void check_typos(const char *arg, const struct option *options)
 305 {
 306         if (strlen(arg) < 3)
 307                 return;
 308
 309         if (!prefixcmp(arg, "no-")) {
 310                 error ("did you mean `--%s` (with two dashes ?)", arg);
 311                 exit(129);
 312         }
 313
 314         for (; options->type != OPTION_END; options++) {
 315                 if (!options->long_name)
 316                         continue;
 317                 if (!prefixcmp(options->long_name, arg)) {
 318                         error ("did you mean `--%s` (with two dashes ?)", arg);
 319                         exit(129);
 320                 }
 321         }
 322 }
 323
 324 void parse_options_start(struct parse_opt_ctx_t *ctx,
 325                          int argc, const char **argv, int flags)
 326 {
 327         memset(ctx, 0, sizeof(*ctx));
 328         ctx->argc = argc - 1;
 329         ctx->argv = argv + 1;
 330         ctx->out  = argv;
 331         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 332         ctx->flags = flags;
 333         if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 334             (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 335                 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 336 }
 337
 338 static int usage_with_options_internal(const char * const *,
 339                                        const struct option *, int);
 340
 341 int parse_options_step(struct parse_opt_ctx_t *ctx,
 342                        const struct option *options,
 343                        const char * const usagestr[])
 344 {
 345         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 346
 347         /* we must reset ->opt, unknown short option leave it dangling */
 348         ctx->opt = NULL;
 349
 350         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 351                 const char *arg = ctx->argv[0];
 352
 353                 if (*arg != '-' || !arg[1]) {
 354                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 355                                 break;
 356                         ctx->out[ctx->cpidx++] = ctx->argv[0];
 357                         continue;
 358                 }
 359
 360                 if (arg[1] != '-') {
 361                         ctx->opt = arg + 1;
 362                         if (internal_help && *ctx->opt == 'h')
 363                                 return usage_with_options_internal(usagestr, options, 0);
 364                         switch (parse_short_opt(ctx, options)) {
 365                         case -1:
 366                                 return parse_options_usage(usagestr, options, arg + 1, 1);
 367                         case -2:
 368                                 goto unknown;
 369                         default:
 370                                 break;
 371                         }
 372                         if (ctx->opt)
 373                                 check_typos(arg + 1, options);
 374                         while (ctx->opt) {
 375                                 if (internal_help && *ctx->opt == 'h')
 376                                         return usage_with_options_internal(usagestr, options, 0);
 377                                 arg = ctx->opt;
 378                                 switch (parse_short_opt(ctx, options)) {
 379                                 case -1:
 380                                         return parse_options_usage(usagestr, options, arg, 1);
 381                                 case -2:
 382                                         /* fake a short option thing to hide the fact that we may have
 383                                          * started to parse aggregated stuff
 384                                          *
 385                                          * This is leaky, too bad.
 386                                          */
 387                                         ctx->argv[0] = strdup(ctx->opt - 1);
 388                                         *(char *)ctx->argv[0] = '-';
 389                                         goto unknown;
 390                                 default:
 391                                         break;
 392                                 }
 393                         }
 394                         continue;
 395                 }
 396
 397                 if (!arg[2]) { /* "--" */
 398                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 399                                 ctx->argc--;
 400                                 ctx->argv++;
 401                         }
 402                         break;
 403                 }
 404
 405                 if (internal_help && !strcmp(arg + 2, "help-all"))
 406                         return usage_with_options_internal(usagestr, options, 1);
 407                 if (internal_help && !strcmp(arg + 2, "help"))
 408                         return usage_with_options_internal(usagestr, options, 0);
 409                 if (!strcmp(arg + 2, "list-opts"))
 410                         return PARSE_OPT_LIST;
 411                 switch (parse_long_opt(ctx, arg + 2, options)) {
 412                 case -1:
 413                         return parse_options_usage(usagestr, options, arg + 2, 0);
 414                 case -2:
 415                         goto unknown;
 416                 default:
 417                         break;
 418                 }
 419                 continue;
 420 unknown:
 421                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 422                         return PARSE_OPT_UNKNOWN;
 423                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 424                 ctx->opt = NULL;
 425         }
 426         return PARSE_OPT_DONE;
 427 }
 428
 429 int parse_options_end(struct parse_opt_ctx_t *ctx)
 430 {
 431         memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 432         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 433         return ctx->cpidx + ctx->argc;
 434 }
 435
 436 int parse_options(int argc, const char **argv, const struct option *options,
 437                   const char * const usagestr[], int flags)
 438 {
 439         struct parse_opt_ctx_t ctx;
 440
 441         perf_header__set_cmdline(argc, argv);
 442
 443         parse_options_start(&ctx, argc, argv, flags);
 444         switch (parse_options_step(&ctx, options, usagestr)) {
 445         case PARSE_OPT_HELP:
 446                 exit(129);
 447         case PARSE_OPT_DONE:
 448                 break;
 449         case PARSE_OPT_LIST:
 450                 while (options->type != OPTION_END) {
 451                         printf("--%s ", options->long_name);
 452                         options++;
 453                 }
 454                 exit(130);
 455         default: /* PARSE_OPT_UNKNOWN */
 456                 if (ctx.argv[0][1] == '-') {
 457                         error("unknown option `%s'", ctx.argv[0] + 2);
 458                 } else {
 459                         error("unknown switch `%c'", *ctx.opt);
 460                 }
 461                 usage_with_options(usagestr, options);
 462         }
 463
 464         return parse_options_end(&ctx);
 465 }
 466
 467 #define USAGE_OPTS_WIDTH 24
 468 #define USAGE_GAP         2
 469
 470 static void print_option_help(const struct option *opts, int full)
 471 {
 472         size_t pos;
 473         int pad;
 474
 475         if (opts->type == OPTION_GROUP) {
 476                 fputc('\n', stderr);
 477                 if (*opts->help)
 478                         fprintf(stderr, "%s\n", opts->help);
 479                 return;
 480         }
 481         if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 482                 return;
 483
 484         pos = fprintf(stderr, "    ");
 485         if (opts->short_name)
 486                 pos += fprintf(stderr, "-%c", opts->short_name);
 487         else
 488                 pos += fprintf(stderr, "    ");
 489
 490         if (opts->long_name && opts->short_name)
 491                 pos += fprintf(stderr, ", ");
 492         if (opts->long_name)
 493                 pos += fprintf(stderr, "--%s", opts->long_name);
 494
 495         switch (opts->type) {
 496         case OPTION_ARGUMENT:
 497                 break;
 498         case OPTION_LONG:
 499         case OPTION_U64:
 500         case OPTION_INTEGER:
 501         case OPTION_UINTEGER:
 502                 if (opts->flags & PARSE_OPT_OPTARG)
 503                         if (opts->long_name)
 504                                 pos += fprintf(stderr, "[=<n>]");
 505                         else
 506                                 pos += fprintf(stderr, "[<n>]");
 507                 else
 508                         pos += fprintf(stderr, " <n>");
 509                 break;
 510         case OPTION_CALLBACK:
 511                 if (opts->flags & PARSE_OPT_NOARG)
 512                         break;
 513                 /* FALLTHROUGH */
 514         case OPTION_STRING:
 515                 if (opts->argh) {
 516                         if (opts->flags & PARSE_OPT_OPTARG)
 517                                 if (opts->long_name)
 518                                         pos += fprintf(stderr, "[=<%s>]", opts->argh);
 519                                 else
 520                                         pos += fprintf(stderr, "[<%s>]", opts->argh);
 521                         else
 522                                 pos += fprintf(stderr, " <%s>", opts->argh);
 523                 } else {
 524                         if (opts->flags & PARSE_OPT_OPTARG)
 525                                 if (opts->long_name)
 526                                         pos += fprintf(stderr, "[=...]");
 527                                 else
 528                                         pos += fprintf(stderr, "[...]");
 529                         else
 530                                 pos += fprintf(stderr, " ...");
 531                 }
 532                 break;
 533         default: /* OPTION_{BIT,BOOLEAN,SET_UINT,SET_PTR} */
 534         case OPTION_END:
 535         case OPTION_GROUP:
 536         case OPTION_BIT:
 537         case OPTION_BOOLEAN:
 538         case OPTION_INCR:
 539         case OPTION_SET_UINT:
 540         case OPTION_SET_PTR:
 541                 break;
 542         }
 543
 544         if (pos <= USAGE_OPTS_WIDTH)
 545                 pad = USAGE_OPTS_WIDTH - pos;
 546         else {
 547                 fputc('\n', stderr);
 548                 pad = USAGE_OPTS_WIDTH;
 549         }
 550         fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
 551 }
 552
 553 int usage_with_options_internal(const char * const *usagestr,
 554                                 const struct option *opts, int full)
 555 {
 556         if (!usagestr)
 557                 return PARSE_OPT_HELP;
 558
 559         fprintf(stderr, "\n usage: %s\n", *usagestr++);
 560         while (*usagestr && **usagestr)
 561                 fprintf(stderr, "    or: %s\n", *usagestr++);
 562         while (*usagestr) {
 563                 fprintf(stderr, "%s%s\n",
 564                                 **usagestr ? "    " : "",
 565                                 *usagestr);
 566                 usagestr++;
 567         }
 568
 569         if (opts->type != OPTION_GROUP)
 570                 fputc('\n', stderr);
 571
 572         for (  ; opts->type != OPTION_END; opts++)
 573                 print_option_help(opts, full);
 574
 575         fputc('\n', stderr);
 576
 577         return PARSE_OPT_HELP;
 578 }
 579
 580 void usage_with_options(const char * const *usagestr,
 581                         const struct option *opts)
 582 {
 583         exit_browser(false);
 584         usage_with_options_internal(usagestr, opts, 0);
 585         exit(129);
 586 }
 587
 588 int parse_options_usage(const char * const *usagestr,
 589                         const struct option *opts,
 590                         const char *optstr, bool short_opt)
 591 {
 592         if (!usagestr)
 593                 goto opt;
 594
 595         fprintf(stderr, "\n usage: %s\n", *usagestr++);
 596         while (*usagestr && **usagestr)
 597                 fprintf(stderr, "    or: %s\n", *usagestr++);
 598         while (*usagestr) {
 599                 fprintf(stderr, "%s%s\n",
 600                                 **usagestr ? "    " : "",
 601                                 *usagestr);
 602                 usagestr++;
 603         }
 604         fputc('\n', stderr);
 605
 606 opt:
 607         for (  ; opts->type != OPTION_END; opts++) {
 608                 if (short_opt) {
 609                         if (opts->short_name == *optstr)
 610                                 break;
 611                         continue;
 612                 }
 613
 614                 if (opts->long_name == NULL)
 615                         continue;
 616
 617                 if (!prefixcmp(optstr, opts->long_name))
 618                         break;
 619                 if (!prefixcmp(optstr, "no-") &&
 620                     !prefixcmp(optstr + 3, opts->long_name))
 621                         break;
 622         }
 623
 624         if (opts->type != OPTION_END)
 625                 print_option_help(opts, 0);
 626
 627         return PARSE_OPT_HELP;
 628 }
 629
 630
 631 int parse_opt_verbosity_cb(const struct option *opt,
 632                            const char *arg __maybe_unused,
 633                            int unset)
 634 {
 635         int *target = opt->value;
 636
 637         if (unset)
 638                 /* --no-quiet, --no-verbose */
 639                 *target = 0;
 640         else if (opt->short_name == 'v') {
 641                 if (*target >= 0)
 642                         (*target)++;
 643                 else
 644                         *target = 1;
 645         } else {
 646                 if (*target <= 0)
 647                         (*target)--;
 648                 else
 649                         *target = -1;
 650         }
 651         return 0;
 652 }