tools/perf/util/parse-options.c

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