tools/lib/subcmd/parse-options.c

   1 #include <linux/compiler.h>
   2 #include <linux/types.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <stdint.h>
   6 #include <string.h>
   7 #include <ctype.h>
   8 #include "subcmd-util.h"
   9 #include "parse-options.h"
  10 #include "subcmd-config.h"
  11 #include "pager.h"
  12
  13 #define OPT_SHORT 1
  14 #define OPT_UNSET 2
  15
  16 char *error_buf;
  17
  18 static int opterror(const struct option *opt, const char *reason, int flags)
  19 {
  20         if (flags & OPT_SHORT)
  21                 fprintf(stderr, " Error: switch `%c' %s", opt->short_name, reason);
  22         else if (flags & OPT_UNSET)
  23                 fprintf(stderr, " Error: option `no-%s' %s", opt->long_name, reason);
  24         else
  25                 fprintf(stderr, " Error: option `%s' %s", opt->long_name, reason);
  26
  27         return -1;
  28 }
  29
  30 static const char *skip_prefix(const char *str, const char *prefix)
  31 {
  32         size_t len = strlen(prefix);
  33         return strncmp(str, prefix, len) ? NULL : str + len;
  34 }
  35
  36 static void optwarning(const struct option *opt, const char *reason, int flags)
  37 {
  38         if (flags & OPT_SHORT)
  39                 fprintf(stderr, " Warning: switch `%c' %s", opt->short_name, reason);
  40         else if (flags & OPT_UNSET)
  41                 fprintf(stderr, " Warning: option `no-%s' %s", opt->long_name, reason);
  42         else
  43                 fprintf(stderr, " Warning: option `%s' %s", opt->long_name, reason);
  44 }
  45
  46 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
  47                    int flags, const char **arg)
  48 {
  49         const char *res;
  50
  51         if (p->opt) {
  52                 res = p->opt;
  53                 p->opt = NULL;
  54         } else if ((opt->flags & PARSE_OPT_LASTARG_DEFAULT) && (p->argc == 1 ||
  55                     **(p->argv + 1) == '-')) {
  56                 res = (const char *)opt->defval;
  57         } else if (p->argc > 1) {
  58                 p->argc--;
  59                 res = *++p->argv;
  60         } else
  61                 return opterror(opt, "requires a value", flags);
  62         if (arg)
  63                 *arg = res;
  64         return 0;
  65 }
  66
  67 static int get_value(struct parse_opt_ctx_t *p,
  68                      const struct option *opt, int flags)
  69 {
  70         const char *s, *arg = NULL;
  71         const int unset = flags & OPT_UNSET;
  72         int err;
  73
  74         if (unset && p->opt)
  75                 return opterror(opt, "takes no value", flags);
  76         if (unset && (opt->flags & PARSE_OPT_NONEG))
  77                 return opterror(opt, "isn't available", flags);
  78         if (opt->flags & PARSE_OPT_DISABLED)
  79                 return opterror(opt, "is not usable", flags);
  80
  81         if (opt->flags & PARSE_OPT_EXCLUSIVE) {
  82                 if (p->excl_opt && p->excl_opt != opt) {
  83                         char msg[128];
  84
  85                         if (((flags & OPT_SHORT) && p->excl_opt->short_name) ||
  86                             p->excl_opt->long_name == NULL) {
  87                                 snprintf(msg, sizeof(msg), "cannot be used with switch `%c'",
  88                                          p->excl_opt->short_name);
  89                         } else {
  90                                 snprintf(msg, sizeof(msg), "cannot be used with %s",
  91                                          p->excl_opt->long_name);
  92                         }
  93                         opterror(opt, msg, flags);
  94                         return -3;
  95                 }
  96                 p->excl_opt = opt;
  97         }
  98         if (!(flags & OPT_SHORT) && p->opt) {
  99                 switch (opt->type) {
 100                 case OPTION_CALLBACK:
 101                         if (!(opt->flags & PARSE_OPT_NOARG))
 102                                 break;
 103                         /* FALLTHROUGH */
 104                 case OPTION_BOOLEAN:
 105                 case OPTION_INCR:
 106                 case OPTION_BIT:
 107                 case OPTION_SET_UINT:
 108                 case OPTION_SET_PTR:
 109                         return opterror(opt, "takes no value", flags);
 110                 case OPTION_END:
 111                 case OPTION_ARGUMENT:
 112                 case OPTION_GROUP:
 113                 case OPTION_STRING:
 114                 case OPTION_INTEGER:
 115                 case OPTION_UINTEGER:
 116                 case OPTION_LONG:
 117                 case OPTION_U64:
 118                 default:
 119                         break;
 120                 }
 121         }
 122
 123         if (opt->flags & PARSE_OPT_NOBUILD) {
 124                 char reason[128];
 125                 bool noarg = false;
 126
 127                 err = snprintf(reason, sizeof(reason),
 128                                 opt->flags & PARSE_OPT_CANSKIP ?
 129                                         "is being ignored because %s " :
 130                                         "is not available because %s",
 131                                 opt->build_opt);
 132                 reason[sizeof(reason) - 1] = '\0';
 133
 134                 if (err < 0)
 135                         strncpy(reason, opt->flags & PARSE_OPT_CANSKIP ?
 136                                         "is being ignored" :
 137                                         "is not available",
 138                                         sizeof(reason));
 139
 140                 if (!(opt->flags & PARSE_OPT_CANSKIP))
 141                         return opterror(opt, reason, flags);
 142
 143                 err = 0;
 144                 if (unset)
 145                         noarg = true;
 146                 if (opt->flags & PARSE_OPT_NOARG)
 147                         noarg = true;
 148                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 149                         noarg = true;
 150
 151                 switch (opt->type) {
 152                 case OPTION_BOOLEAN:
 153                 case OPTION_INCR:
 154                 case OPTION_BIT:
 155                 case OPTION_SET_UINT:
 156                 case OPTION_SET_PTR:
 157                 case OPTION_END:
 158                 case OPTION_ARGUMENT:
 159                 case OPTION_GROUP:
 160                         noarg = true;
 161                         break;
 162                 case OPTION_CALLBACK:
 163                 case OPTION_STRING:
 164                 case OPTION_INTEGER:
 165                 case OPTION_UINTEGER:
 166                 case OPTION_LONG:
 167                 case OPTION_U64:
 168                 default:
 169                         break;
 170                 }
 171
 172                 if (!noarg)
 173                         err = get_arg(p, opt, flags, NULL);
 174                 if (err)
 175                         return err;
 176
 177                 optwarning(opt, reason, flags);
 178                 return 0;
 179         }
 180
 181         switch (opt->type) {
 182         case OPTION_BIT:
 183                 if (unset)
 184                         *(int *)opt->value &= ~opt->defval;
 185                 else
 186                         *(int *)opt->value |= opt->defval;
 187                 return 0;
 188
 189         case OPTION_BOOLEAN:
 190                 *(bool *)opt->value = unset ? false : true;
 191                 if (opt->set)
 192                         *(bool *)opt->set = true;
 193                 return 0;
 194
 195         case OPTION_INCR:
 196                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
 197                 return 0;
 198
 199         case OPTION_SET_UINT:
 200                 *(unsigned int *)opt->value = unset ? 0 : opt->defval;
 201                 return 0;
 202
 203         case OPTION_SET_PTR:
 204                 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
 205                 return 0;
 206
 207         case OPTION_STRING:
 208                 err = 0;
 209                 if (unset)
 210                         *(const char **)opt->value = NULL;
 211                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 212                         *(const char **)opt->value = (const char *)opt->defval;
 213                 else
 214                         err = get_arg(p, opt, flags, (const char **)opt->value);
 215
 216                 /* PARSE_OPT_NOEMPTY: Allow NULL but disallow empty string. */
 217                 if (opt->flags & PARSE_OPT_NOEMPTY) {
 218                         const char *val = *(const char **)opt->value;
 219
 220                         if (!val)
 221                                 return err;
 222
 223                         /* Similar to unset if we are given an empty string. */
 224                         if (val[0] == '\0') {
 225                                 *(const char **)opt->value = NULL;
 226                                 return 0;
 227                         }
 228                 }
 229
 230                 return err;
 231
 232         case OPTION_CALLBACK:
 233                 if (unset)
 234                         return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 235                 if (opt->flags & PARSE_OPT_NOARG)
 236                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 237                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 238                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 239                 if (get_arg(p, opt, flags, &arg))
 240                         return -1;
 241                 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 242
 243         case OPTION_INTEGER:
 244                 if (unset) {
 245                         *(int *)opt->value = 0;
 246                         return 0;
 247                 }
 248                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 249                         *(int *)opt->value = opt->defval;
 250                         return 0;
 251                 }
 252                 if (get_arg(p, opt, flags, &arg))
 253                         return -1;
 254                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 255                 if (*s)
 256                         return opterror(opt, "expects a numerical value", flags);
 257                 return 0;
 258
 259         case OPTION_UINTEGER:
 260                 if (unset) {
 261                         *(unsigned int *)opt->value = 0;
 262                         return 0;
 263                 }
 264                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 265                         *(unsigned int *)opt->value = opt->defval;
 266                         return 0;
 267                 }
 268                 if (get_arg(p, opt, flags, &arg))
 269                         return -1;
 270                 *(unsigned int *)opt->value = strtol(arg, (char **)&s, 10);
 271                 if (*s)
 272                         return opterror(opt, "expects a numerical value", flags);
 273                 return 0;
 274
 275         case OPTION_LONG:
 276                 if (unset) {
 277                         *(long *)opt->value = 0;
 278                         return 0;
 279                 }
 280                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 281                         *(long *)opt->value = opt->defval;
 282                         return 0;
 283                 }
 284                 if (get_arg(p, opt, flags, &arg))
 285                         return -1;
 286                 *(long *)opt->value = strtol(arg, (char **)&s, 10);
 287                 if (*s)
 288                         return opterror(opt, "expects a numerical value", flags);
 289                 return 0;
 290
 291         case OPTION_U64:
 292                 if (unset) {
 293                         *(u64 *)opt->value = 0;
 294                         return 0;
 295                 }
 296                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 297                         *(u64 *)opt->value = opt->defval;
 298                         return 0;
 299                 }
 300                 if (get_arg(p, opt, flags, &arg))
 301                         return -1;
 302                 *(u64 *)opt->value = strtoull(arg, (char **)&s, 10);
 303                 if (*s)
 304                         return opterror(opt, "expects a numerical value", flags);
 305                 return 0;
 306
 307         case OPTION_END:
 308         case OPTION_ARGUMENT:
 309         case OPTION_GROUP:
 310         default:
 311                 die("should not happen, someone must be hit on the forehead");
 312         }
 313 }
 314
 315 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 316 {
 317 retry:
 318         for (; options->type != OPTION_END; options++) {
 319                 if (options->short_name == *p->opt) {
 320                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 321                         return get_value(p, options, OPT_SHORT);
 322                 }
 323         }
 324
 325         if (options->parent) {
 326                 options = options->parent;
 327                 goto retry;
 328         }
 329
 330         return -2;
 331 }
 332
 333 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 334                           const struct option *options)
 335 {
 336         const char *arg_end = strchr(arg, '=');
 337         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 338         int abbrev_flags = 0, ambiguous_flags = 0;
 339
 340         if (!arg_end)
 341                 arg_end = arg + strlen(arg);
 342
 343 retry:
 344         for (; options->type != OPTION_END; options++) {
 345                 const char *rest;
 346                 int flags = 0;
 347
 348                 if (!options->long_name)
 349                         continue;
 350
 351                 rest = skip_prefix(arg, options->long_name);
 352                 if (options->type == OPTION_ARGUMENT) {
 353                         if (!rest)
 354                                 continue;
 355                         if (*rest == '=')
 356                                 return opterror(options, "takes no value", flags);
 357                         if (*rest)
 358                                 continue;
 359                         p->out[p->cpidx++] = arg - 2;
 360                         return 0;
 361                 }
 362                 if (!rest) {
 363                         if (!prefixcmp(options->long_name, "no-")) {
 364                                 /*
 365                                  * The long name itself starts with "no-", so
 366                                  * accept the option without "no-" so that users
 367                                  * do not have to enter "no-no-" to get the
 368                                  * negation.
 369                                  */
 370                                 rest = skip_prefix(arg, options->long_name + 3);
 371                                 if (rest) {
 372                                         flags |= OPT_UNSET;
 373                                         goto match;
 374                                 }
 375                                 /* Abbreviated case */
 376                                 if (!prefixcmp(options->long_name + 3, arg)) {
 377                                         flags |= OPT_UNSET;
 378                                         goto is_abbreviated;
 379                                 }
 380                         }
 381                         /* abbreviated? */
 382                         if (!strncmp(options->long_name, arg, arg_end - arg)) {
 383 is_abbreviated:
 384                                 if (abbrev_option) {
 385                                         /*
 386                                          * If this is abbreviated, it is
 387                                          * ambiguous. So when there is no
 388                                          * exact match later, we need to
 389                                          * error out.
 390                                          */
 391                                         ambiguous_option = abbrev_option;
 392                                         ambiguous_flags = abbrev_flags;
 393                                 }
 394                                 if (!(flags & OPT_UNSET) && *arg_end)
 395                                         p->opt = arg_end + 1;
 396                                 abbrev_option = options;
 397                                 abbrev_flags = flags;
 398                                 continue;
 399                         }
 400                         /* negated and abbreviated very much? */
 401                         if (!prefixcmp("no-", arg)) {
 402                                 flags |= OPT_UNSET;
 403                                 goto is_abbreviated;
 404                         }
 405                         /* negated? */
 406                         if (strncmp(arg, "no-", 3))
 407                                 continue;
 408                         flags |= OPT_UNSET;
 409                         rest = skip_prefix(arg + 3, options->long_name);
 410                         /* abbreviated and negated? */
 411                         if (!rest && !prefixcmp(options->long_name, arg + 3))
 412                                 goto is_abbreviated;
 413                         if (!rest)
 414                                 continue;
 415                 }
 416 match:
 417                 if (*rest) {
 418                         if (*rest != '=')
 419                                 continue;
 420                         p->opt = rest + 1;
 421                 }
 422                 return get_value(p, options, flags);
 423         }
 424
 425         if (ambiguous_option) {
 426                  fprintf(stderr,
 427                          " Error: Ambiguous option: %s (could be --%s%s or --%s%s)",
 428                          arg,
 429                          (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 430                          ambiguous_option->long_name,
 431                          (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 432                          abbrev_option->long_name);
 433                  return -1;
 434         }
 435         if (abbrev_option)
 436                 return get_value(p, abbrev_option, abbrev_flags);
 437
 438         if (options->parent) {
 439                 options = options->parent;
 440                 goto retry;
 441         }
 442
 443         return -2;
 444 }
 445
 446 static void check_typos(const char *arg, const struct option *options)
 447 {
 448         if (strlen(arg) < 3)
 449                 return;
 450
 451         if (!prefixcmp(arg, "no-")) {
 452                 fprintf(stderr, " Error: did you mean `--%s` (with two dashes ?)", arg);
 453                 exit(129);
 454         }
 455
 456         for (; options->type != OPTION_END; options++) {
 457                 if (!options->long_name)
 458                         continue;
 459                 if (!prefixcmp(options->long_name, arg)) {
 460                         fprintf(stderr, " Error: did you mean `--%s` (with two dashes ?)", arg);
 461                         exit(129);
 462                 }
 463         }
 464 }
 465
 466 static void parse_options_start(struct parse_opt_ctx_t *ctx,
 467                                 int argc, const char **argv, int flags)
 468 {
 469         memset(ctx, 0, sizeof(*ctx));
 470         ctx->argc = argc - 1;
 471         ctx->argv = argv + 1;
 472         ctx->out  = argv;
 473         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 474         ctx->flags = flags;
 475         if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 476             (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 477                 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 478 }
 479
 480 static int usage_with_options_internal(const char * const *,
 481                                        const struct option *, int,
 482                                        struct parse_opt_ctx_t *);
 483
 484 static int parse_options_step(struct parse_opt_ctx_t *ctx,
 485                               const struct option *options,
 486                               const char * const usagestr[])
 487 {
 488         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 489         int excl_short_opt = 1;
 490         const char *arg;
 491
 492         /* we must reset ->opt, unknown short option leave it dangling */
 493         ctx->opt = NULL;
 494
 495         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 496                 arg = ctx->argv[0];
 497                 if (*arg != '-' || !arg[1]) {
 498                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 499                                 break;
 500                         ctx->out[ctx->cpidx++] = ctx->argv[0];
 501                         continue;
 502                 }
 503
 504                 if (arg[1] != '-') {
 505                         ctx->opt = ++arg;
 506                         if (internal_help && *ctx->opt == 'h') {
 507                                 return usage_with_options_internal(usagestr, options, 0, ctx);
 508                         }
 509                         switch (parse_short_opt(ctx, options)) {
 510                         case -1:
 511                                 return parse_options_usage(usagestr, options, arg, 1);
 512                         case -2:
 513                                 goto unknown;
 514                         case -3:
 515                                 goto exclusive;
 516                         default:
 517                                 break;
 518                         }
 519                         if (ctx->opt)
 520                                 check_typos(arg, options);
 521                         while (ctx->opt) {
 522                                 if (internal_help && *ctx->opt == 'h')
 523                                         return usage_with_options_internal(usagestr, options, 0, ctx);
 524                                 arg = ctx->opt;
 525                                 switch (parse_short_opt(ctx, options)) {
 526                                 case -1:
 527                                         return parse_options_usage(usagestr, options, arg, 1);
 528                                 case -2:
 529                                         /* fake a short option thing to hide the fact that we may have
 530                                          * started to parse aggregated stuff
 531                                          *
 532                                          * This is leaky, too bad.
 533                                          */
 534                                         ctx->argv[0] = strdup(ctx->opt - 1);
 535                                         *(char *)ctx->argv[0] = '-';
 536                                         goto unknown;
 537                                 case -3:
 538                                         goto exclusive;
 539                                 default:
 540                                         break;
 541                                 }
 542                         }
 543                         continue;
 544                 }
 545
 546                 if (!arg[2]) { /* "--" */
 547                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 548                                 ctx->argc--;
 549                                 ctx->argv++;
 550                         }
 551                         break;
 552                 }
 553
 554                 arg += 2;
 555                 if (internal_help && !strcmp(arg, "help-all"))
 556                         return usage_with_options_internal(usagestr, options, 1, ctx);
 557                 if (internal_help && !strcmp(arg, "help"))
 558                         return usage_with_options_internal(usagestr, options, 0, ctx);
 559                 if (!strcmp(arg, "list-opts"))
 560                         return PARSE_OPT_LIST_OPTS;
 561                 if (!strcmp(arg, "list-cmds"))
 562                         return PARSE_OPT_LIST_SUBCMDS;
 563                 switch (parse_long_opt(ctx, arg, options)) {
 564                 case -1:
 565                         return parse_options_usage(usagestr, options, arg, 0);
 566                 case -2:
 567                         goto unknown;
 568                 case -3:
 569                         excl_short_opt = 0;
 570                         goto exclusive;
 571                 default:
 572                         break;
 573                 }
 574                 continue;
 575 unknown:
 576                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 577                         return PARSE_OPT_UNKNOWN;
 578                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 579                 ctx->opt = NULL;
 580         }
 581         return PARSE_OPT_DONE;
 582
 583 exclusive:
 584         parse_options_usage(usagestr, options, arg, excl_short_opt);
 585         if ((excl_short_opt && ctx->excl_opt->short_name) ||
 586             ctx->excl_opt->long_name == NULL) {
 587                 char opt = ctx->excl_opt->short_name;
 588                 parse_options_usage(NULL, options, &opt, 1);
 589         } else {
 590                 parse_options_usage(NULL, options, ctx->excl_opt->long_name, 0);
 591         }
 592         return PARSE_OPT_HELP;
 593 }
 594
 595 static int parse_options_end(struct parse_opt_ctx_t *ctx)
 596 {
 597         memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 598         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 599         return ctx->cpidx + ctx->argc;
 600 }
 601
 602 int parse_options_subcommand(int argc, const char **argv, const struct option *options,
 603                         const char *const subcommands[], const char *usagestr[], int flags)
 604 {
 605         struct parse_opt_ctx_t ctx;
 606
 607         /* build usage string if it's not provided */
 608         if (subcommands && !usagestr[0]) {
 609                 char *buf = NULL;
 610
 611                 astrcatf(&buf, "%s %s [<options>] {", subcmd_config.exec_name, argv[0]);
 612
 613                 for (int i = 0; subcommands[i]; i++) {
 614                         if (i)
 615                                 astrcat(&buf, "|");
 616                         astrcat(&buf, subcommands[i]);
 617                 }
 618                 astrcat(&buf, "}");
 619
 620                 usagestr[0] = buf;
 621         }
 622
 623         parse_options_start(&ctx, argc, argv, flags);
 624         switch (parse_options_step(&ctx, options, usagestr)) {
 625         case PARSE_OPT_HELP:
 626                 exit(129);
 627         case PARSE_OPT_DONE:
 628                 break;
 629         case PARSE_OPT_LIST_OPTS:
 630                 while (options->type != OPTION_END) {
 631                         if (options->long_name)
 632                                 printf("--%s ", options->long_name);
 633                         options++;
 634                 }
 635                 putchar('\n');
 636                 exit(130);
 637         case PARSE_OPT_LIST_SUBCMDS:
 638                 if (subcommands) {
 639                         for (int i = 0; subcommands[i]; i++)
 640                                 printf("%s ", subcommands[i]);
 641                 }
 642                 putchar('\n');
 643                 exit(130);
 644         default: /* PARSE_OPT_UNKNOWN */
 645                 if (ctx.argv[0][1] == '-')
 646                         astrcatf(&error_buf, "unknown option `%s'",
 647                                  ctx.argv[0] + 2);
 648                 else
 649                         astrcatf(&error_buf, "unknown switch `%c'", *ctx.opt);
 650                 usage_with_options(usagestr, options);
 651         }
 652
 653         return parse_options_end(&ctx);
 654 }
 655
 656 int parse_options(int argc, const char **argv, const struct option *options,
 657                   const char * const usagestr[], int flags)
 658 {
 659         return parse_options_subcommand(argc, argv, options, NULL,
 660                                         (const char **) usagestr, flags);
 661 }
 662
 663 #define USAGE_OPTS_WIDTH 24
 664 #define USAGE_GAP         2
 665
 666 static void print_option_help(const struct option *opts, int full)
 667 {
 668         size_t pos;
 669         int pad;
 670
 671         if (opts->type == OPTION_GROUP) {
 672                 fputc('\n', stderr);
 673                 if (*opts->help)
 674                         fprintf(stderr, "%s\n", opts->help);
 675                 return;
 676         }
 677         if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 678                 return;
 679         if (opts->flags & PARSE_OPT_DISABLED)
 680                 return;
 681
 682         pos = fprintf(stderr, "    ");
 683         if (opts->short_name)
 684                 pos += fprintf(stderr, "-%c", opts->short_name);
 685         else
 686                 pos += fprintf(stderr, "    ");
 687
 688         if (opts->long_name && opts->short_name)
 689                 pos += fprintf(stderr, ", ");
 690         if (opts->long_name)
 691                 pos += fprintf(stderr, "--%s", opts->long_name);
 692
 693         switch (opts->type) {
 694         case OPTION_ARGUMENT:
 695                 break;
 696         case OPTION_LONG:
 697         case OPTION_U64:
 698         case OPTION_INTEGER:
 699         case OPTION_UINTEGER:
 700                 if (opts->flags & PARSE_OPT_OPTARG)
 701                         if (opts->long_name)
 702                                 pos += fprintf(stderr, "[=<n>]");
 703                         else
 704                                 pos += fprintf(stderr, "[<n>]");
 705                 else
 706                         pos += fprintf(stderr, " <n>");
 707                 break;
 708         case OPTION_CALLBACK:
 709                 if (opts->flags & PARSE_OPT_NOARG)
 710                         break;
 711                 /* FALLTHROUGH */
 712         case OPTION_STRING:
 713                 if (opts->argh) {
 714                         if (opts->flags & PARSE_OPT_OPTARG)
 715                                 if (opts->long_name)
 716                                         pos += fprintf(stderr, "[=<%s>]", opts->argh);
 717                                 else
 718                                         pos += fprintf(stderr, "[<%s>]", opts->argh);
 719                         else
 720                                 pos += fprintf(stderr, " <%s>", opts->argh);
 721                 } else {
 722                         if (opts->flags & PARSE_OPT_OPTARG)
 723                                 if (opts->long_name)
 724                                         pos += fprintf(stderr, "[=...]");
 725                                 else
 726                                         pos += fprintf(stderr, "[...]");
 727                         else
 728                                 pos += fprintf(stderr, " ...");
 729                 }
 730                 break;
 731         default: /* OPTION_{BIT,BOOLEAN,SET_UINT,SET_PTR} */
 732         case OPTION_END:
 733         case OPTION_GROUP:
 734         case OPTION_BIT:
 735         case OPTION_BOOLEAN:
 736         case OPTION_INCR:
 737         case OPTION_SET_UINT:
 738         case OPTION_SET_PTR:
 739                 break;
 740         }
 741
 742         if (pos <= USAGE_OPTS_WIDTH)
 743                 pad = USAGE_OPTS_WIDTH - pos;
 744         else {
 745                 fputc('\n', stderr);
 746                 pad = USAGE_OPTS_WIDTH;
 747         }
 748         fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
 749         if (opts->flags & PARSE_OPT_NOBUILD)
 750                 fprintf(stderr, "%*s(not built-in because %s)\n",
 751                         USAGE_OPTS_WIDTH + USAGE_GAP, "",
 752                         opts->build_opt);
 753 }
 754
 755 static int option__cmp(const void *va, const void *vb)
 756 {
 757         const struct option *a = va, *b = vb;
 758         int sa = tolower(a->short_name), sb = tolower(b->short_name), ret;
 759
 760         if (sa == 0)
 761                 sa = 'z' + 1;
 762         if (sb == 0)
 763                 sb = 'z' + 1;
 764
 765         ret = sa - sb;
 766
 767         if (ret == 0) {
 768                 const char *la = a->long_name ?: "",
 769                            *lb = b->long_name ?: "";
 770                 ret = strcmp(la, lb);
 771         }
 772
 773         return ret;
 774 }
 775
 776 static struct option *options__order(const struct option *opts)
 777 {
 778         int nr_opts = 0, len;
 779         const struct option *o = opts;
 780         struct option *ordered;
 781
 782         for (o = opts; o->type != OPTION_END; o++)
 783                 ++nr_opts;
 784
 785         len = sizeof(*o) * (nr_opts + 1);
 786         ordered = malloc(len);
 787         if (!ordered)
 788                 goto out;
 789         memcpy(ordered, opts, len);
 790
 791         qsort(ordered, nr_opts, sizeof(*o), option__cmp);
 792 out:
 793         return ordered;
 794 }
 795
 796 static bool option__in_argv(const struct option *opt, const struct parse_opt_ctx_t *ctx)
 797 {
 798         int i;
 799
 800         for (i = 1; i < ctx->argc; ++i) {
 801                 const char *arg = ctx->argv[i];
 802
 803                 if (arg[0] != '-') {
 804                         if (arg[1] == '\0') {
 805                                 if (arg[0] == opt->short_name)
 806                                         return true;
 807                                 continue;
 808                         }
 809
 810                         if (opt->long_name && strcmp(opt->long_name, arg) == 0)
 811                                 return true;
 812
 813                         if (opt->help && strcasestr(opt->help, arg) != NULL)
 814                                 return true;
 815
 816                         continue;
 817                 }
 818
 819                 if (arg[1] == opt->short_name ||
 820                     (arg[1] == '-' && opt->long_name && strcmp(opt->long_name, arg + 2) == 0))
 821                         return true;
 822         }
 823
 824         return false;
 825 }
 826
 827 static int usage_with_options_internal(const char * const *usagestr,
 828                                        const struct option *opts, int full,
 829                                        struct parse_opt_ctx_t *ctx)
 830 {
 831         struct option *ordered;
 832
 833         if (!usagestr)
 834                 return PARSE_OPT_HELP;
 835
 836         setup_pager();
 837
 838         if (error_buf) {
 839                 fprintf(stderr, "  Error: %s\n", error_buf);
 840                 zfree(&error_buf);
 841         }
 842
 843         fprintf(stderr, "\n Usage: %s\n", *usagestr++);
 844         while (*usagestr && **usagestr)
 845                 fprintf(stderr, "    or: %s\n", *usagestr++);
 846         while (*usagestr) {
 847                 fprintf(stderr, "%s%s\n",
 848                                 **usagestr ? "    " : "",
 849                                 *usagestr);
 850                 usagestr++;
 851         }
 852
 853         if (opts->type != OPTION_GROUP)
 854                 fputc('\n', stderr);
 855
 856         ordered = options__order(opts);
 857         if (ordered)
 858                 opts = ordered;
 859
 860         for (  ; opts->type != OPTION_END; opts++) {
 861                 if (ctx && ctx->argc > 1 && !option__in_argv(opts, ctx))
 862                         continue;
 863                 print_option_help(opts, full);
 864         }
 865
 866         fputc('\n', stderr);
 867
 868         free(ordered);
 869
 870         return PARSE_OPT_HELP;
 871 }
 872
 873 void usage_with_options(const char * const *usagestr,
 874                         const struct option *opts)
 875 {
 876         usage_with_options_internal(usagestr, opts, 0, NULL);
 877         exit(129);
 878 }
 879
 880 void usage_with_options_msg(const char * const *usagestr,
 881                             const struct option *opts, const char *fmt, ...)
 882 {
 883         va_list ap;
 884         char *tmp = error_buf;
 885
 886         va_start(ap, fmt);
 887         if (vasprintf(&error_buf, fmt, ap) == -1)
 888                 die("vasprintf failed");
 889         va_end(ap);
 890
 891         free(tmp);
 892
 893         usage_with_options_internal(usagestr, opts, 0, NULL);
 894         exit(129);
 895 }
 896
 897 int parse_options_usage(const char * const *usagestr,
 898                         const struct option *opts,
 899                         const char *optstr, bool short_opt)
 900 {
 901         if (!usagestr)
 902                 goto opt;
 903
 904         fprintf(stderr, "\n Usage: %s\n", *usagestr++);
 905         while (*usagestr && **usagestr)
 906                 fprintf(stderr, "    or: %s\n", *usagestr++);
 907         while (*usagestr) {
 908                 fprintf(stderr, "%s%s\n",
 909                                 **usagestr ? "    " : "",
 910                                 *usagestr);
 911                 usagestr++;
 912         }
 913         fputc('\n', stderr);
 914
 915 opt:
 916         for (  ; opts->type != OPTION_END; opts++) {
 917                 if (short_opt) {
 918                         if (opts->short_name == *optstr) {
 919                                 print_option_help(opts, 0);
 920                                 break;
 921                         }
 922                         continue;
 923                 }
 924
 925                 if (opts->long_name == NULL)
 926                         continue;
 927
 928                 if (!prefixcmp(opts->long_name, optstr))
 929                         print_option_help(opts, 0);
 930                 if (!prefixcmp("no-", optstr) &&
 931                     !prefixcmp(opts->long_name, optstr + 3))
 932                         print_option_help(opts, 0);
 933         }
 934
 935         return PARSE_OPT_HELP;
 936 }
 937
 938
 939 int parse_opt_verbosity_cb(const struct option *opt,
 940                            const char *arg __maybe_unused,
 941                            int unset)
 942 {
 943         int *target = opt->value;
 944
 945         if (unset)
 946                 /* --no-quiet, --no-verbose */
 947                 *target = 0;
 948         else if (opt->short_name == 'v') {
 949                 if (*target >= 0)
 950                         (*target)++;
 951                 else
 952                         *target = 1;
 953         } else {
 954                 if (*target <= 0)
 955                         (*target)--;
 956                 else
 957                         *target = -1;
 958         }
 959         return 0;
 960 }
 961
 962 static struct option *
 963 find_option(struct option *opts, int shortopt, const char *longopt)
 964 {
 965         for (; opts->type != OPTION_END; opts++) {
 966                 if ((shortopt && opts->short_name == shortopt) ||
 967                     (opts->long_name && longopt &&
 968                      !strcmp(opts->long_name, longopt)))
 969                         return opts;
 970         }
 971         return NULL;
 972 }
 973
 974 void set_option_flag(struct option *opts, int shortopt, const char *longopt,
 975                      int flag)
 976 {
 977         struct option *opt = find_option(opts, shortopt, longopt);
 978
 979         if (opt)
 980                 opt->flags |= flag;
 981         return;
 982 }
 983
 984 void set_option_nobuild(struct option *opts, int shortopt,
 985                         const char *longopt,
 986                         const char *build_opt,
 987                         bool can_skip)
 988 {
 989         struct option *opt = find_option(opts, shortopt, longopt);
 990
 991         if (!opt)
 992                 return;
 993
 994         opt->flags |= PARSE_OPT_NOBUILD;
 995         opt->flags |= can_skip ? PARSE_OPT_CANSKIP : 0;
 996         opt->build_opt = build_opt;
 997 }