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 #define OPT_SHORT 1
   9 #define OPT_UNSET 2
  10
  11 int optbug(const struct option *opt, const char *reason)
  12 {
  13         if (opt->long_name) {
  14                 if (opt->short_name)
  15                         return error("BUG: switch '%c' (--%s) %s",
  16                                      opt->short_name, opt->long_name, reason);
  17                 return error("BUG: option '%s' %s", opt->long_name, reason);
  18         }
  19         return error("BUG: switch '%c' %s", opt->short_name, reason);
  20 }
  21
  22 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
  23                    int flags, const char **arg)
  24 {
  25         if (p->opt) {
  26                 *arg = p->opt;
  27                 p->opt = NULL;
  28         } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
  29                 *arg = (const char *)opt->defval;
  30         } else if (p->argc > 1) {
  31                 p->argc--;
  32                 *arg = *++p->argv;
  33         } else
  34                 return opterror(opt, "requires a value", flags);
  35         return 0;
  36 }
  37
  38 static void fix_filename(const char *prefix, const char **file)
  39 {
  40         if (!file || !*file || !prefix || is_absolute_path(*file)
  41             || !strcmp("-", *file))
  42                 return;
  43         *file = xstrdup(prefix_filename(prefix, strlen(prefix), *file));
  44 }
  45
  46 static int opt_command_mode_error(const struct option *opt,
  47                                   const struct option *all_opts,
  48                                   int flags)
  49 {
  50         const struct option *that;
  51         struct strbuf message = STRBUF_INIT;
  52         struct strbuf that_name = STRBUF_INIT;
  53
  54         /*
  55          * Find the other option that was used to set the variable
  56          * already, and report that this is not compatible with it.
  57          */
  58         for (that = all_opts; that->type != OPTION_END; that++) {
  59                 if (that == opt ||
  60                     that->type != OPTION_CMDMODE ||
  61                     that->value != opt->value ||
  62                     that->defval != *(int *)opt->value)
  63                         continue;
  64
  65                 if (that->long_name)
  66                         strbuf_addf(&that_name, "--%s", that->long_name);
  67                 else
  68                         strbuf_addf(&that_name, "-%c", that->short_name);
  69                 strbuf_addf(&message, ": incompatible with %s", that_name.buf);
  70                 strbuf_release(&that_name);
  71                 opterror(opt, message.buf, flags);
  72                 strbuf_release(&message);
  73                 return -1;
  74         }
  75         return opterror(opt, ": incompatible with something else", flags);
  76 }
  77
  78 static int get_value(struct parse_opt_ctx_t *p,
  79                      const struct option *opt,
  80                      const struct option *all_opts,
  81                      int flags)
  82 {
  83         const char *s, *arg;
  84         const int unset = flags & OPT_UNSET;
  85         int err;
  86
  87         if (unset && p->opt)
  88                 return opterror(opt, "takes no value", flags);
  89         if (unset && (opt->flags & PARSE_OPT_NONEG))
  90                 return opterror(opt, "isn't available", flags);
  91         if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
  92                 return opterror(opt, "takes no value", flags);
  93
  94         switch (opt->type) {
  95         case OPTION_LOWLEVEL_CALLBACK:
  96                 return (*(parse_opt_ll_cb *)opt->callback)(p, opt, unset);
  97
  98         case OPTION_BIT:
  99                 if (unset)
 100                         *(int *)opt->value &= ~opt->defval;
 101                 else
 102                         *(int *)opt->value |= opt->defval;
 103                 return 0;
 104
 105         case OPTION_NEGBIT:
 106                 if (unset)
 107                         *(int *)opt->value |= opt->defval;
 108                 else
 109                         *(int *)opt->value &= ~opt->defval;
 110                 return 0;
 111
 112         case OPTION_COUNTUP:
 113                 if (*(int *)opt->value < 0)
 114                         *(int *)opt->value = 0;
 115                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
 116                 return 0;
 117
 118         case OPTION_SET_INT:
 119                 *(int *)opt->value = unset ? 0 : opt->defval;
 120                 return 0;
 121
 122         case OPTION_CMDMODE:
 123                 /*
 124                  * Giving the same mode option twice, although is unnecessary,
 125                  * is not a grave error, so let it pass.
 126                  */
 127                 if (*(int *)opt->value && *(int *)opt->value != opt->defval)
 128                         return opt_command_mode_error(opt, all_opts, flags);
 129                 *(int *)opt->value = opt->defval;
 130                 return 0;
 131
 132         case OPTION_STRING:
 133                 if (unset)
 134                         *(const char **)opt->value = NULL;
 135                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 136                         *(const char **)opt->value = (const char *)opt->defval;
 137                 else
 138                         return get_arg(p, opt, flags, (const char **)opt->value);
 139                 return 0;
 140
 141         case OPTION_FILENAME:
 142                 err = 0;
 143                 if (unset)
 144                         *(const char **)opt->value = NULL;
 145                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 146                         *(const char **)opt->value = (const char *)opt->defval;
 147                 else
 148                         err = get_arg(p, opt, flags, (const char **)opt->value);
 149
 150                 if (!err)
 151                         fix_filename(p->prefix, (const char **)opt->value);
 152                 return err;
 153
 154         case OPTION_CALLBACK:
 155                 if (unset)
 156                         return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 157                 if (opt->flags & PARSE_OPT_NOARG)
 158                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 159                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 160                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 161                 if (get_arg(p, opt, flags, &arg))
 162                         return -1;
 163                 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 164
 165         case OPTION_INTEGER:
 166                 if (unset) {
 167                         *(int *)opt->value = 0;
 168                         return 0;
 169                 }
 170                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 171                         *(int *)opt->value = opt->defval;
 172                         return 0;
 173                 }
 174                 if (get_arg(p, opt, flags, &arg))
 175                         return -1;
 176                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 177                 if (*s)
 178                         return opterror(opt, "expects a numerical value", flags);
 179                 return 0;
 180
 181         case OPTION_MAGNITUDE:
 182                 if (unset) {
 183                         *(unsigned long *)opt->value = 0;
 184                         return 0;
 185                 }
 186                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 187                         *(unsigned long *)opt->value = opt->defval;
 188                         return 0;
 189                 }
 190                 if (get_arg(p, opt, flags, &arg))
 191                         return -1;
 192                 if (!git_parse_ulong(arg, opt->value))
 193                         return opterror(opt,
 194                                 "expects a non-negative integer value with an optional k/m/g suffix",
 195                                 flags);
 196                 return 0;
 197
 198         default:
 199                 die("should not happen, someone must be hit on the forehead");
 200         }
 201 }
 202
 203 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 204 {
 205         const struct option *all_opts = options;
 206         const struct option *numopt = NULL;
 207
 208         for (; options->type != OPTION_END; options++) {
 209                 if (options->short_name == *p->opt) {
 210                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 211                         return get_value(p, options, all_opts, OPT_SHORT);
 212                 }
 213
 214                 /*
 215                  * Handle the numerical option later, explicit one-digit
 216                  * options take precedence over it.
 217                  */
 218                 if (options->type == OPTION_NUMBER)
 219                         numopt = options;
 220         }
 221         if (numopt && isdigit(*p->opt)) {
 222                 size_t len = 1;
 223                 char *arg;
 224                 int rc;
 225
 226                 while (isdigit(p->opt[len]))
 227                         len++;
 228                 arg = xmemdupz(p->opt, len);
 229                 p->opt = p->opt[len] ? p->opt + len : NULL;
 230                 rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 231                 free(arg);
 232                 return rc;
 233         }
 234         return -2;
 235 }
 236
 237 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 238                           const struct option *options)
 239 {
 240         const struct option *all_opts = options;
 241         const char *arg_end = strchrnul(arg, '=');
 242         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 243         int abbrev_flags = 0, ambiguous_flags = 0;
 244
 245         for (; options->type != OPTION_END; options++) {
 246                 const char *rest, *long_name = options->long_name;
 247                 int flags = 0, opt_flags = 0;
 248
 249                 if (!long_name)
 250                         continue;
 251
 252 again:
 253                 if (!skip_prefix(arg, long_name, &rest))
 254                         rest = NULL;
 255                 if (options->type == OPTION_ARGUMENT) {
 256                         if (!rest)
 257                                 continue;
 258                         if (*rest == '=')
 259                                 return opterror(options, "takes no value", flags);
 260                         if (*rest)
 261                                 continue;
 262                         p->out[p->cpidx++] = arg - 2;
 263                         return 0;
 264                 }
 265                 if (!rest) {
 266                         /* abbreviated? */
 267                         if (!strncmp(long_name, arg, arg_end - arg)) {
 268 is_abbreviated:
 269                                 if (abbrev_option) {
 270                                         /*
 271                                          * If this is abbreviated, it is
 272                                          * ambiguous. So when there is no
 273                                          * exact match later, we need to
 274                                          * error out.
 275                                          */
 276                                         ambiguous_option = abbrev_option;
 277                                         ambiguous_flags = abbrev_flags;
 278                                 }
 279                                 if (!(flags & OPT_UNSET) && *arg_end)
 280                                         p->opt = arg_end + 1;
 281                                 abbrev_option = options;
 282                                 abbrev_flags = flags ^ opt_flags;
 283                                 continue;
 284                         }
 285                         /* negation allowed? */
 286                         if (options->flags & PARSE_OPT_NONEG)
 287                                 continue;
 288                         /* negated and abbreviated very much? */
 289                         if (starts_with("no-", arg)) {
 290                                 flags |= OPT_UNSET;
 291                                 goto is_abbreviated;
 292                         }
 293                         /* negated? */
 294                         if (!starts_with(arg, "no-")) {
 295                                 if (starts_with(long_name, "no-")) {
 296                                         long_name += 3;
 297                                         opt_flags |= OPT_UNSET;
 298                                         goto again;
 299                                 }
 300                                 continue;
 301                         }
 302                         flags |= OPT_UNSET;
 303                         if (!skip_prefix(arg + 3, long_name, &rest)) {
 304                                 /* abbreviated and negated? */
 305                                 if (starts_with(long_name, arg + 3))
 306                                         goto is_abbreviated;
 307                                 else
 308                                         continue;
 309                         }
 310                 }
 311                 if (*rest) {
 312                         if (*rest != '=')
 313                                 continue;
 314                         p->opt = rest + 1;
 315                 }
 316                 return get_value(p, options, all_opts, flags ^ opt_flags);
 317         }
 318
 319         if (ambiguous_option)
 320                 return error("Ambiguous option: %s "
 321                         "(could be --%s%s or --%s%s)",
 322                         arg,
 323                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 324                         ambiguous_option->long_name,
 325                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 326                         abbrev_option->long_name);
 327         if (abbrev_option)
 328                 return get_value(p, abbrev_option, all_opts, abbrev_flags);
 329         return -2;
 330 }
 331
 332 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 333                             const struct option *options)
 334 {
 335         const struct option *all_opts = options;
 336
 337         for (; options->type != OPTION_END; options++) {
 338                 if (!(options->flags & PARSE_OPT_NODASH))
 339                         continue;
 340                 if (options->short_name == arg[0] && arg[1] == '\0')
 341                         return get_value(p, options, all_opts, OPT_SHORT);
 342         }
 343         return -2;
 344 }
 345
 346 static void check_typos(const char *arg, const struct option *options)
 347 {
 348         if (strlen(arg) < 3)
 349                 return;
 350
 351         if (starts_with(arg, "no-")) {
 352                 error ("did you mean `--%s` (with two dashes ?)", arg);
 353                 exit(129);
 354         }
 355
 356         for (; options->type != OPTION_END; options++) {
 357                 if (!options->long_name)
 358                         continue;
 359                 if (starts_with(options->long_name, arg)) {
 360                         error ("did you mean `--%s` (with two dashes ?)", arg);
 361                         exit(129);
 362                 }
 363         }
 364 }
 365
 366 static void parse_options_check(const struct option *opts)
 367 {
 368         int err = 0;
 369         char short_opts[128];
 370
 371         memset(short_opts, '\0', sizeof(short_opts));
 372         for (; opts->type != OPTION_END; opts++) {
 373                 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 374                     (opts->flags & PARSE_OPT_OPTARG))
 375                         err |= optbug(opts, "uses incompatible flags "
 376                                         "LASTARG_DEFAULT and OPTARG");
 377                 if (opts->short_name) {
 378                         if (0x7F <= opts->short_name)
 379                                 err |= optbug(opts, "invalid short name");
 380                         else if (short_opts[opts->short_name]++)
 381                                 err |= optbug(opts, "short name already used");
 382                 }
 383                 if (opts->flags & PARSE_OPT_NODASH &&
 384                     ((opts->flags & PARSE_OPT_OPTARG) ||
 385                      !(opts->flags & PARSE_OPT_NOARG) ||
 386                      !(opts->flags & PARSE_OPT_NONEG) ||
 387                      opts->long_name))
 388                         err |= optbug(opts, "uses feature "
 389                                         "not supported for dashless options");
 390                 switch (opts->type) {
 391                 case OPTION_COUNTUP:
 392                 case OPTION_BIT:
 393                 case OPTION_NEGBIT:
 394                 case OPTION_SET_INT:
 395                 case OPTION_NUMBER:
 396                         if ((opts->flags & PARSE_OPT_OPTARG) ||
 397                             !(opts->flags & PARSE_OPT_NOARG))
 398                                 err |= optbug(opts, "should not accept an argument");
 399                 default:
 400                         ; /* ok. (usually accepts an argument) */
 401                 }
 402                 if (opts->argh &&
 403                     strcspn(opts->argh, " _") != strlen(opts->argh))
 404                         err |= optbug(opts, "multi-word argh should use dash to separate words");
 405         }
 406         if (err)
 407                 exit(128);
 408 }
 409
 410 void parse_options_start(struct parse_opt_ctx_t *ctx,
 411                          int argc, const char **argv, const char *prefix,
 412                          const struct option *options, int flags)
 413 {
 414         memset(ctx, 0, sizeof(*ctx));
 415         ctx->argc = ctx->total = argc - 1;
 416         ctx->argv = argv + 1;
 417         ctx->out  = argv;
 418         ctx->prefix = prefix;
 419         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 420         ctx->flags = flags;
 421         if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 422             (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 423                 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 424         parse_options_check(options);
 425 }
 426
 427 static int usage_with_options_internal(struct parse_opt_ctx_t *,
 428                                        const char * const *,
 429                                        const struct option *, int, int);
 430
 431 int parse_options_step(struct parse_opt_ctx_t *ctx,
 432                        const struct option *options,
 433                        const char * const usagestr[])
 434 {
 435         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 436         int err = 0;
 437
 438         /* we must reset ->opt, unknown short option leave it dangling */
 439         ctx->opt = NULL;
 440
 441         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 442                 const char *arg = ctx->argv[0];
 443
 444                 if (*arg != '-' || !arg[1]) {
 445                         if (parse_nodash_opt(ctx, arg, options) == 0)
 446                                 continue;
 447                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 448                                 return PARSE_OPT_NON_OPTION;
 449                         ctx->out[ctx->cpidx++] = ctx->argv[0];
 450                         continue;
 451                 }
 452
 453                 /* lone -h asks for help */
 454                 if (internal_help && ctx->total == 1 && !strcmp(arg + 1, "h"))
 455                         goto show_usage;
 456
 457                 if (arg[1] != '-') {
 458                         ctx->opt = arg + 1;
 459                         switch (parse_short_opt(ctx, options)) {
 460                         case -1:
 461                                 goto show_usage_error;
 462                         case -2:
 463                                 if (ctx->opt)
 464                                         check_typos(arg + 1, options);
 465                                 if (internal_help && *ctx->opt == 'h')
 466                                         goto show_usage;
 467                                 goto unknown;
 468                         }
 469                         if (ctx->opt)
 470                                 check_typos(arg + 1, options);
 471                         while (ctx->opt) {
 472                                 switch (parse_short_opt(ctx, options)) {
 473                                 case -1:
 474                                         goto show_usage_error;
 475                                 case -2:
 476                                         if (internal_help && *ctx->opt == 'h')
 477                                                 goto show_usage;
 478
 479                                         /* fake a short option thing to hide the fact that we may have
 480                                          * started to parse aggregated stuff
 481                                          *
 482                                          * This is leaky, too bad.
 483                                          */
 484                                         ctx->argv[0] = xstrdup(ctx->opt - 1);
 485                                         *(char *)ctx->argv[0] = '-';
 486                                         goto unknown;
 487                                 }
 488                         }
 489                         continue;
 490                 }
 491
 492                 if (!arg[2]) { /* "--" */
 493                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 494                                 ctx->argc--;
 495                                 ctx->argv++;
 496                         }
 497                         break;
 498                 }
 499
 500                 if (internal_help && !strcmp(arg + 2, "help-all"))
 501                         return usage_with_options_internal(ctx, usagestr, options, 1, 0);
 502                 if (internal_help && !strcmp(arg + 2, "help"))
 503                         goto show_usage;
 504                 switch (parse_long_opt(ctx, arg + 2, options)) {
 505                 case -1:
 506                         goto show_usage_error;
 507                 case -2:
 508                         goto unknown;
 509                 }
 510                 continue;
 511 unknown:
 512                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 513                         return PARSE_OPT_UNKNOWN;
 514                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 515                 ctx->opt = NULL;
 516         }
 517         return PARSE_OPT_DONE;
 518
 519  show_usage_error:
 520         err = 1;
 521  show_usage:
 522         return usage_with_options_internal(ctx, usagestr, options, 0, err);
 523 }
 524
 525 int parse_options_end(struct parse_opt_ctx_t *ctx)
 526 {
 527         memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 528         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 529         return ctx->cpidx + ctx->argc;
 530 }
 531
 532 int parse_options(int argc, const char **argv, const char *prefix,
 533                   const struct option *options, const char * const usagestr[],
 534                   int flags)
 535 {
 536         struct parse_opt_ctx_t ctx;
 537
 538         parse_options_start(&ctx, argc, argv, prefix, options, flags);
 539         switch (parse_options_step(&ctx, options, usagestr)) {
 540         case PARSE_OPT_HELP:
 541                 exit(129);
 542         case PARSE_OPT_NON_OPTION:
 543         case PARSE_OPT_DONE:
 544                 break;
 545         default: /* PARSE_OPT_UNKNOWN */
 546                 if (ctx.argv[0][1] == '-') {
 547                         error("unknown option `%s'", ctx.argv[0] + 2);
 548                 } else if (isascii(*ctx.opt)) {
 549                         error("unknown switch `%c'", *ctx.opt);
 550                 } else {
 551                         error("unknown non-ascii option in string: `%s'",
 552                               ctx.argv[0]);
 553                 }
 554                 usage_with_options(usagestr, options);
 555         }
 556
 557         precompose_argv(argc, argv);
 558         return parse_options_end(&ctx);
 559 }
 560
 561 static int usage_argh(const struct option *opts, FILE *outfile)
 562 {
 563         const char *s;
 564         int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
 565         if (opts->flags & PARSE_OPT_OPTARG)
 566                 if (opts->long_name)
 567                         s = literal ? "[=%s]" : "[=<%s>]";
 568                 else
 569                         s = literal ? "[%s]" : "[<%s>]";
 570         else
 571                 s = literal ? " %s" : " <%s>";
 572         return utf8_fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
 573 }
 574
 575 #define USAGE_OPTS_WIDTH 24
 576 #define USAGE_GAP         2
 577
 578 static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
 579                                        const char * const *usagestr,
 580                                        const struct option *opts, int full, int err)
 581 {
 582         FILE *outfile = err ? stderr : stdout;
 583
 584         if (!usagestr)
 585                 return PARSE_OPT_HELP;
 586
 587         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 588                 fprintf(outfile, "cat <<\\EOF\n");
 589
 590         fprintf_ln(outfile, _("usage: %s"), _(*usagestr++));
 591         while (*usagestr && **usagestr)
 592                 /* TRANSLATORS: the colon here should align with the
 593                    one in "usage: %s" translation */
 594                 fprintf_ln(outfile, _("   or: %s"), _(*usagestr++));
 595         while (*usagestr) {
 596                 if (**usagestr)
 597                         fprintf_ln(outfile, _("    %s"), _(*usagestr));
 598                 else
 599                         putchar('\n');
 600                 usagestr++;
 601         }
 602
 603         if (opts->type != OPTION_GROUP)
 604                 fputc('\n', outfile);
 605
 606         for (; opts->type != OPTION_END; opts++) {
 607                 size_t pos;
 608                 int pad;
 609
 610                 if (opts->type == OPTION_GROUP) {
 611                         fputc('\n', outfile);
 612                         if (*opts->help)
 613                                 fprintf(outfile, "%s\n", _(opts->help));
 614                         continue;
 615                 }
 616                 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 617                         continue;
 618
 619                 pos = fprintf(outfile, "    ");
 620                 if (opts->short_name) {
 621                         if (opts->flags & PARSE_OPT_NODASH)
 622                                 pos += fprintf(outfile, "%c", opts->short_name);
 623                         else
 624                                 pos += fprintf(outfile, "-%c", opts->short_name);
 625                 }
 626                 if (opts->long_name && opts->short_name)
 627                         pos += fprintf(outfile, ", ");
 628                 if (opts->long_name)
 629                         pos += fprintf(outfile, "--%s", opts->long_name);
 630                 if (opts->type == OPTION_NUMBER)
 631                         pos += utf8_fprintf(outfile, _("-NUM"));
 632
 633                 if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
 634                     !(opts->flags & PARSE_OPT_NOARG))
 635                         pos += usage_argh(opts, outfile);
 636
 637                 if (pos <= USAGE_OPTS_WIDTH)
 638                         pad = USAGE_OPTS_WIDTH - pos;
 639                 else {
 640                         fputc('\n', outfile);
 641                         pad = USAGE_OPTS_WIDTH;
 642                 }
 643                 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", _(opts->help));
 644         }
 645         fputc('\n', outfile);
 646
 647         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 648                 fputs("EOF\n", outfile);
 649
 650         return PARSE_OPT_HELP;
 651 }
 652
 653 void NORETURN usage_with_options(const char * const *usagestr,
 654                         const struct option *opts)
 655 {
 656         usage_with_options_internal(NULL, usagestr, opts, 0, 1);
 657         exit(129);
 658 }
 659
 660 void NORETURN usage_msg_opt(const char *msg,
 661                    const char * const *usagestr,
 662                    const struct option *options)
 663 {
 664         fprintf(stderr, "fatal: %s\n\n", msg);
 665         usage_with_options(usagestr, options);
 666 }
 667
 668 #undef opterror
 669 int opterror(const struct option *opt, const char *reason, int flags)
 670 {
 671         if (flags & OPT_SHORT)
 672                 return error("switch `%c' %s", opt->short_name, reason);
 673         if (flags & OPT_UNSET)
 674                 return error("option `no-%s' %s", opt->long_name, reason);
 675         return error("option `%s' %s", opt->long_name, reason);
 676 }