parse-options.c

   1 #include "git-compat-util.h"
   2 #include "parse-options.h"
   3 #include "cache.h"
   4 #include "commit.h"
   5 #include "color.h"
   6 #include "utf8.h"
   7
   8 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
   9                                const char * const *usagestr,
  10                                const struct option *opts, int err);
  11
  12 #define OPT_SHORT 1
  13 #define OPT_UNSET 2
  14
  15 int optbug(const struct option *opt, const char *reason)
  16 {
  17         if (opt->long_name) {
  18                 if (opt->short_name)
  19                         return error("BUG: switch '%c' (--%s) %s",
  20                                      opt->short_name, opt->long_name, reason);
  21                 return error("BUG: option '%s' %s", opt->long_name, reason);
  22         }
  23         return error("BUG: switch '%c' %s", opt->short_name, reason);
  24 }
  25
  26 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
  27                    int flags, const char **arg)
  28 {
  29         if (p->opt) {
  30                 *arg = p->opt;
  31                 p->opt = NULL;
  32         } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
  33                 *arg = (const char *)opt->defval;
  34         } else if (p->argc > 1) {
  35                 p->argc--;
  36                 *arg = *++p->argv;
  37         } else
  38                 return opterror(opt, "requires a value", flags);
  39         return 0;
  40 }
  41
  42 static void fix_filename(const char *prefix, const char **file)
  43 {
  44         if (!file || !*file || !prefix || is_absolute_path(*file)
  45             || !strcmp("-", *file))
  46                 return;
  47         *file = xstrdup(prefix_filename(prefix, strlen(prefix), *file));
  48 }
  49
  50 static int opt_command_mode_error(const struct option *opt,
  51                                   const struct option *all_opts,
  52                                   int flags)
  53 {
  54         const struct option *that;
  55         struct strbuf message = STRBUF_INIT;
  56         struct strbuf that_name = STRBUF_INIT;
  57
  58         /*
  59          * Find the other option that was used to set the variable
  60          * already, and report that this is not compatible with it.
  61          */
  62         for (that = all_opts; that->type != OPTION_END; that++) {
  63                 if (that == opt ||
  64                     that->type != OPTION_CMDMODE ||
  65                     that->value != opt->value ||
  66                     that->defval != *(int *)opt->value)
  67                         continue;
  68
  69                 if (that->long_name)
  70                         strbuf_addf(&that_name, "--%s", that->long_name);
  71                 else
  72                         strbuf_addf(&that_name, "-%c", that->short_name);
  73                 strbuf_addf(&message, ": incompatible with %s", that_name.buf);
  74                 strbuf_release(&that_name);
  75                 opterror(opt, message.buf, flags);
  76                 strbuf_release(&message);
  77                 return -1;
  78         }
  79         return opterror(opt, ": incompatible with something else", flags);
  80 }
  81
  82 static int get_value(struct parse_opt_ctx_t *p,
  83                      const struct option *opt,
  84                      const struct option *all_opts,
  85                      int flags)
  86 {
  87         const char *s, *arg;
  88         const int unset = flags & OPT_UNSET;
  89         int err;
  90
  91         if (unset && p->opt)
  92                 return opterror(opt, "takes no value", flags);
  93         if (unset && (opt->flags & PARSE_OPT_NONEG))
  94                 return opterror(opt, "isn't available", flags);
  95         if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
  96                 return opterror(opt, "takes no value", flags);
  97
  98         switch (opt->type) {
  99         case OPTION_LOWLEVEL_CALLBACK:
 100                 return (*(parse_opt_ll_cb *)opt->callback)(p, opt, unset);
 101
 102         case OPTION_BIT:
 103                 if (unset)
 104                         *(int *)opt->value &= ~opt->defval;
 105                 else
 106                         *(int *)opt->value |= opt->defval;
 107                 return 0;
 108
 109         case OPTION_NEGBIT:
 110                 if (unset)
 111                         *(int *)opt->value |= opt->defval;
 112                 else
 113                         *(int *)opt->value &= ~opt->defval;
 114                 return 0;
 115
 116         case OPTION_COUNTUP:
 117                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
 118                 return 0;
 119
 120         case OPTION_SET_INT:
 121                 *(int *)opt->value = unset ? 0 : opt->defval;
 122                 return 0;
 123
 124         case OPTION_CMDMODE:
 125                 /*
 126                  * Giving the same mode option twice, although is unnecessary,
 127                  * is not a grave error, so let it pass.
 128                  */
 129                 if (*(int *)opt->value && *(int *)opt->value != opt->defval)
 130                         return opt_command_mode_error(opt, all_opts, flags);
 131                 *(int *)opt->value = opt->defval;
 132                 return 0;
 133
 134         case OPTION_STRING:
 135                 if (unset)
 136                         *(const char **)opt->value = NULL;
 137                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 138                         *(const char **)opt->value = (const char *)opt->defval;
 139                 else
 140                         return get_arg(p, opt, flags, (const char **)opt->value);
 141                 return 0;
 142
 143         case OPTION_FILENAME:
 144                 err = 0;
 145                 if (unset)
 146                         *(const char **)opt->value = NULL;
 147                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 148                         *(const char **)opt->value = (const char *)opt->defval;
 149                 else
 150                         err = get_arg(p, opt, flags, (const char **)opt->value);
 151
 152                 if (!err)
 153                         fix_filename(p->prefix, (const char **)opt->value);
 154                 return err;
 155
 156         case OPTION_CALLBACK:
 157                 if (unset)
 158                         return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 159                 if (opt->flags & PARSE_OPT_NOARG)
 160                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 161                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 162                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 163                 if (get_arg(p, opt, flags, &arg))
 164                         return -1;
 165                 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 166
 167         case OPTION_INTEGER:
 168                 if (unset) {
 169                         *(int *)opt->value = 0;
 170                         return 0;
 171                 }
 172                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 173                         *(int *)opt->value = opt->defval;
 174                         return 0;
 175                 }
 176                 if (get_arg(p, opt, flags, &arg))
 177                         return -1;
 178                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 179                 if (*s)
 180                         return opterror(opt, "expects a numerical value", flags);
 181                 return 0;
 182
 183         default:
 184                 die("should not happen, someone must be hit on the forehead");
 185         }
 186 }
 187
 188 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 189 {
 190         const struct option *all_opts = options;
 191         const struct option *numopt = NULL;
 192
 193         for (; options->type != OPTION_END; options++) {
 194                 if (options->short_name == *p->opt) {
 195                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 196                         return get_value(p, options, all_opts, OPT_SHORT);
 197                 }
 198
 199                 /*
 200                  * Handle the numerical option later, explicit one-digit
 201                  * options take precedence over it.
 202                  */
 203                 if (options->type == OPTION_NUMBER)
 204                         numopt = options;
 205         }
 206         if (numopt && isdigit(*p->opt)) {
 207                 size_t len = 1;
 208                 char *arg;
 209                 int rc;
 210
 211                 while (isdigit(p->opt[len]))
 212                         len++;
 213                 arg = xmemdupz(p->opt, len);
 214                 p->opt = p->opt[len] ? p->opt + len : NULL;
 215                 rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 216                 free(arg);
 217                 return rc;
 218         }
 219         return -2;
 220 }
 221
 222 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 223                           const struct option *options)
 224 {
 225         const struct option *all_opts = options;
 226         const char *arg_end = strchrnul(arg, '=');
 227         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 228         int abbrev_flags = 0, ambiguous_flags = 0;
 229
 230         for (; options->type != OPTION_END; options++) {
 231                 const char *rest, *long_name = options->long_name;
 232                 int flags = 0, opt_flags = 0;
 233
 234                 if (!long_name)
 235                         continue;
 236
 237 again:
 238                 if (!skip_prefix(arg, long_name, &rest))
 239                         rest = NULL;
 240                 if (options->type == OPTION_ARGUMENT) {
 241                         if (!rest)
 242                                 continue;
 243                         if (*rest == '=')
 244                                 return opterror(options, "takes no value", flags);
 245                         if (*rest)
 246                                 continue;
 247                         p->out[p->cpidx++] = arg - 2;
 248                         return 0;
 249                 }
 250                 if (!rest) {
 251                         /* abbreviated? */
 252                         if (!strncmp(long_name, arg, arg_end - arg)) {
 253 is_abbreviated:
 254                                 if (abbrev_option) {
 255                                         /*
 256                                          * If this is abbreviated, it is
 257                                          * ambiguous. So when there is no
 258                                          * exact match later, we need to
 259                                          * error out.
 260                                          */
 261                                         ambiguous_option = abbrev_option;
 262                                         ambiguous_flags = abbrev_flags;
 263                                 }
 264                                 if (!(flags & OPT_UNSET) && *arg_end)
 265                                         p->opt = arg_end + 1;
 266                                 abbrev_option = options;
 267                                 abbrev_flags = flags ^ opt_flags;
 268                                 continue;
 269                         }
 270                         /* negation allowed? */
 271                         if (options->flags & PARSE_OPT_NONEG)
 272                                 continue;
 273                         /* negated and abbreviated very much? */
 274                         if (starts_with("no-", arg)) {
 275                                 flags |= OPT_UNSET;
 276                                 goto is_abbreviated;
 277                         }
 278                         /* negated? */
 279                         if (!starts_with(arg, "no-")) {
 280                                 if (starts_with(long_name, "no-")) {
 281                                         long_name += 3;
 282                                         opt_flags |= OPT_UNSET;
 283                                         goto again;
 284                                 }
 285                                 continue;
 286                         }
 287                         flags |= OPT_UNSET;
 288                         if (!skip_prefix(arg + 3, long_name, &rest)) {
 289                                 /* abbreviated and negated? */
 290                                 if (starts_with(long_name, arg + 3))
 291                                         goto is_abbreviated;
 292                                 else
 293                                         continue;
 294                         }
 295                 }
 296                 if (*rest) {
 297                         if (*rest != '=')
 298                                 continue;
 299                         p->opt = rest + 1;
 300                 }
 301                 return get_value(p, options, all_opts, flags ^ opt_flags);
 302         }
 303
 304         if (ambiguous_option)
 305                 return error("Ambiguous option: %s "
 306                         "(could be --%s%s or --%s%s)",
 307                         arg,
 308                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 309                         ambiguous_option->long_name,
 310                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 311                         abbrev_option->long_name);
 312         if (abbrev_option)
 313                 return get_value(p, abbrev_option, all_opts, abbrev_flags);
 314         return -2;
 315 }
 316
 317 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 318                             const struct option *options)
 319 {
 320         const struct option *all_opts = options;
 321
 322         for (; options->type != OPTION_END; options++) {
 323                 if (!(options->flags & PARSE_OPT_NODASH))
 324                         continue;
 325                 if (options->short_name == arg[0] && arg[1] == '\0')
 326                         return get_value(p, options, all_opts, OPT_SHORT);
 327         }
 328         return -2;
 329 }
 330
 331 static void check_typos(const char *arg, const struct option *options)
 332 {
 333         if (strlen(arg) < 3)
 334                 return;
 335
 336         if (starts_with(arg, "no-")) {
 337                 error ("did you mean `--%s` (with two dashes ?)", arg);
 338                 exit(129);
 339         }
 340
 341         for (; options->type != OPTION_END; options++) {
 342                 if (!options->long_name)
 343                         continue;
 344                 if (starts_with(options->long_name, arg)) {
 345                         error ("did you mean `--%s` (with two dashes ?)", arg);
 346                         exit(129);
 347                 }
 348         }
 349 }
 350
 351 static void parse_options_check(const struct option *opts)
 352 {
 353         int err = 0;
 354         char short_opts[128];
 355
 356         memset(short_opts, '\0', sizeof(short_opts));
 357         for (; opts->type != OPTION_END; opts++) {
 358                 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 359                     (opts->flags & PARSE_OPT_OPTARG))
 360                         err |= optbug(opts, "uses incompatible flags "
 361                                         "LASTARG_DEFAULT and OPTARG");
 362                 if (opts->short_name) {
 363                         if (0x7F <= opts->short_name)
 364                                 err |= optbug(opts, "invalid short name");
 365                         else if (short_opts[opts->short_name]++)
 366                                 err |= optbug(opts, "short name already used");
 367                 }
 368                 if (opts->flags & PARSE_OPT_NODASH &&
 369                     ((opts->flags & PARSE_OPT_OPTARG) ||
 370                      !(opts->flags & PARSE_OPT_NOARG) ||
 371                      !(opts->flags & PARSE_OPT_NONEG) ||
 372                      opts->long_name))
 373                         err |= optbug(opts, "uses feature "
 374                                         "not supported for dashless options");
 375                 switch (opts->type) {
 376                 case OPTION_COUNTUP:
 377                 case OPTION_BIT:
 378                 case OPTION_NEGBIT:
 379                 case OPTION_SET_INT:
 380                 case OPTION_NUMBER:
 381                         if ((opts->flags & PARSE_OPT_OPTARG) ||
 382                             !(opts->flags & PARSE_OPT_NOARG))
 383                                 err |= optbug(opts, "should not accept an argument");
 384                 default:
 385                         ; /* ok. (usually accepts an argument) */
 386                 }
 387                 if (opts->argh &&
 388                     strcspn(opts->argh, " _") != strlen(opts->argh))
 389                         err |= optbug(opts, "multi-word argh should use dash to separate words");
 390         }
 391         if (err)
 392                 exit(128);
 393 }
 394
 395 void parse_options_start(struct parse_opt_ctx_t *ctx,
 396                          int argc, const char **argv, const char *prefix,
 397                          const struct option *options, int flags)
 398 {
 399         memset(ctx, 0, sizeof(*ctx));
 400         ctx->argc = argc - 1;
 401         ctx->argv = argv + 1;
 402         ctx->out  = argv;
 403         ctx->prefix = prefix;
 404         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 405         ctx->flags = flags;
 406         if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 407             (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 408                 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 409         parse_options_check(options);
 410 }
 411
 412 static int usage_with_options_internal(struct parse_opt_ctx_t *,
 413                                        const char * const *,
 414                                        const struct option *, int, int);
 415
 416 int parse_options_step(struct parse_opt_ctx_t *ctx,
 417                        const struct option *options,
 418                        const char * const usagestr[])
 419 {
 420         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 421
 422         /* we must reset ->opt, unknown short option leave it dangling */
 423         ctx->opt = NULL;
 424
 425         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 426                 const char *arg = ctx->argv[0];
 427
 428                 if (*arg != '-' || !arg[1]) {
 429                         if (parse_nodash_opt(ctx, arg, options) == 0)
 430                                 continue;
 431                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 432                                 return PARSE_OPT_NON_OPTION;
 433                         ctx->out[ctx->cpidx++] = ctx->argv[0];
 434                         continue;
 435                 }
 436
 437                 if (arg[1] != '-') {
 438                         ctx->opt = arg + 1;
 439                         if (internal_help && *ctx->opt == 'h')
 440                                 return parse_options_usage(ctx, usagestr, options, 0);
 441                         switch (parse_short_opt(ctx, options)) {
 442                         case -1:
 443                                 return parse_options_usage(ctx, usagestr, options, 1);
 444                         case -2:
 445                                 if (ctx->opt)
 446                                         check_typos(arg + 1, options);
 447                                 goto unknown;
 448                         }
 449                         if (ctx->opt)
 450                                 check_typos(arg + 1, options);
 451                         while (ctx->opt) {
 452                                 if (internal_help && *ctx->opt == 'h')
 453                                         return parse_options_usage(ctx, usagestr, options, 0);
 454                                 switch (parse_short_opt(ctx, options)) {
 455                                 case -1:
 456                                         return parse_options_usage(ctx, usagestr, options, 1);
 457                                 case -2:
 458                                         /* fake a short option thing to hide the fact that we may have
 459                                          * started to parse aggregated stuff
 460                                          *
 461                                          * This is leaky, too bad.
 462                                          */
 463                                         ctx->argv[0] = xstrdup(ctx->opt - 1);
 464                                         *(char *)ctx->argv[0] = '-';
 465                                         goto unknown;
 466                                 }
 467                         }
 468                         continue;
 469                 }
 470
 471                 if (!arg[2]) { /* "--" */
 472                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 473                                 ctx->argc--;
 474                                 ctx->argv++;
 475                         }
 476                         break;
 477                 }
 478
 479                 if (internal_help && !strcmp(arg + 2, "help-all"))
 480                         return usage_with_options_internal(ctx, usagestr, options, 1, 0);
 481                 if (internal_help && !strcmp(arg + 2, "help"))
 482                         return parse_options_usage(ctx, usagestr, options, 0);
 483                 switch (parse_long_opt(ctx, arg + 2, options)) {
 484                 case -1:
 485                         return parse_options_usage(ctx, usagestr, options, 1);
 486                 case -2:
 487                         goto unknown;
 488                 }
 489                 continue;
 490 unknown:
 491                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 492                         return PARSE_OPT_UNKNOWN;
 493                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 494                 ctx->opt = NULL;
 495         }
 496         return PARSE_OPT_DONE;
 497 }
 498
 499 int parse_options_end(struct parse_opt_ctx_t *ctx)
 500 {
 501         memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 502         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 503         return ctx->cpidx + ctx->argc;
 504 }
 505
 506 int parse_options(int argc, const char **argv, const char *prefix,
 507                   const struct option *options, const char * const usagestr[],
 508                   int flags)
 509 {
 510         struct parse_opt_ctx_t ctx;
 511
 512         parse_options_start(&ctx, argc, argv, prefix, options, flags);
 513         switch (parse_options_step(&ctx, options, usagestr)) {
 514         case PARSE_OPT_HELP:
 515                 exit(129);
 516         case PARSE_OPT_NON_OPTION:
 517         case PARSE_OPT_DONE:
 518                 break;
 519         default: /* PARSE_OPT_UNKNOWN */
 520                 if (ctx.argv[0][1] == '-') {
 521                         error("unknown option `%s'", ctx.argv[0] + 2);
 522                 } else if (isascii(*ctx.opt)) {
 523                         error("unknown switch `%c'", *ctx.opt);
 524                 } else {
 525                         error("unknown non-ascii option in string: `%s'",
 526                               ctx.argv[0]);
 527                 }
 528                 usage_with_options(usagestr, options);
 529         }
 530
 531         precompose_argv(argc, argv);
 532         return parse_options_end(&ctx);
 533 }
 534
 535 static int usage_argh(const struct option *opts, FILE *outfile)
 536 {
 537         const char *s;
 538         int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
 539         if (opts->flags & PARSE_OPT_OPTARG)
 540                 if (opts->long_name)
 541                         s = literal ? "[=%s]" : "[=<%s>]";
 542                 else
 543                         s = literal ? "[%s]" : "[<%s>]";
 544         else
 545                 s = literal ? " %s" : " <%s>";
 546         return utf8_fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
 547 }
 548
 549 #define USAGE_OPTS_WIDTH 24
 550 #define USAGE_GAP         2
 551
 552 static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
 553                                        const char * const *usagestr,
 554                                        const struct option *opts, int full, int err)
 555 {
 556         FILE *outfile = err ? stderr : stdout;
 557
 558         if (!usagestr)
 559                 return PARSE_OPT_HELP;
 560
 561         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 562                 fprintf(outfile, "cat <<\\EOF\n");
 563
 564         fprintf_ln(outfile, _("usage: %s"), _(*usagestr++));
 565         while (*usagestr && **usagestr)
 566                 /* TRANSLATORS: the colon here should align with the
 567                    one in "usage: %s" translation */
 568                 fprintf_ln(outfile, _("   or: %s"), _(*usagestr++));
 569         while (*usagestr) {
 570                 if (**usagestr)
 571                         fprintf_ln(outfile, _("    %s"), _(*usagestr));
 572                 else
 573                         putchar('\n');
 574                 usagestr++;
 575         }
 576
 577         if (opts->type != OPTION_GROUP)
 578                 fputc('\n', outfile);
 579
 580         for (; opts->type != OPTION_END; opts++) {
 581                 size_t pos;
 582                 int pad;
 583
 584                 if (opts->type == OPTION_GROUP) {
 585                         fputc('\n', outfile);
 586                         if (*opts->help)
 587                                 fprintf(outfile, "%s\n", _(opts->help));
 588                         continue;
 589                 }
 590                 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 591                         continue;
 592
 593                 pos = fprintf(outfile, "    ");
 594                 if (opts->short_name) {
 595                         if (opts->flags & PARSE_OPT_NODASH)
 596                                 pos += fprintf(outfile, "%c", opts->short_name);
 597                         else
 598                                 pos += fprintf(outfile, "-%c", opts->short_name);
 599                 }
 600                 if (opts->long_name && opts->short_name)
 601                         pos += fprintf(outfile, ", ");
 602                 if (opts->long_name)
 603                         pos += fprintf(outfile, "--%s", opts->long_name);
 604                 if (opts->type == OPTION_NUMBER)
 605                         pos += utf8_fprintf(outfile, _("-NUM"));
 606
 607                 if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
 608                     !(opts->flags & PARSE_OPT_NOARG))
 609                         pos += usage_argh(opts, outfile);
 610
 611                 if (pos <= USAGE_OPTS_WIDTH)
 612                         pad = USAGE_OPTS_WIDTH - pos;
 613                 else {
 614                         fputc('\n', outfile);
 615                         pad = USAGE_OPTS_WIDTH;
 616                 }
 617                 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", _(opts->help));
 618         }
 619         fputc('\n', outfile);
 620
 621         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 622                 fputs("EOF\n", outfile);
 623
 624         return PARSE_OPT_HELP;
 625 }
 626
 627 void NORETURN usage_with_options(const char * const *usagestr,
 628                         const struct option *opts)
 629 {
 630         usage_with_options_internal(NULL, usagestr, opts, 0, 1);
 631         exit(129);
 632 }
 633
 634 void NORETURN usage_msg_opt(const char *msg,
 635                    const char * const *usagestr,
 636                    const struct option *options)
 637 {
 638         fprintf(stderr, "%s\n\n", msg);
 639         usage_with_options(usagestr, options);
 640 }
 641
 642 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
 643                                const char * const *usagestr,
 644                                const struct option *opts, int err)
 645 {
 646         return usage_with_options_internal(ctx, usagestr, opts, 0, err);
 647 }
 648
 649 #undef opterror
 650 int opterror(const struct option *opt, const char *reason, int flags)
 651 {
 652         if (flags & OPT_SHORT)
 653                 return error("switch `%c' %s", opt->short_name, reason);
 654         if (flags & OPT_UNSET)
 655                 return error("option `no-%s' %s", opt->long_name, reason);
 656         return error("option `%s' %s", opt->long_name, reason);
 657 }