Andrew's git / gitweb.git / parse-options.c
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parse-options.con commit parse-options: inline parse_options_usage() at its only remaining caller (d3d1f8c)
   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
  11int 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
  22static 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
  38static 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
  46static 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
  78static 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                *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
 114                return 0;
 115
 116        case OPTION_SET_INT:
 117                *(int *)opt->value = unset ? 0 : opt->defval;
 118                return 0;
 119
 120        case OPTION_CMDMODE:
 121                /*
 122                 * Giving the same mode option twice, although is unnecessary,
 123                 * is not a grave error, so let it pass.
 124                 */
 125                if (*(int *)opt->value && *(int *)opt->value != opt->defval)
 126                        return opt_command_mode_error(opt, all_opts, flags);
 127                *(int *)opt->value = opt->defval;
 128                return 0;
 129
 130        case OPTION_STRING:
 131                if (unset)
 132                        *(const char **)opt->value = NULL;
 133                else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 134                        *(const char **)opt->value = (const char *)opt->defval;
 135                else
 136                        return get_arg(p, opt, flags, (const char **)opt->value);
 137                return 0;
 138
 139        case OPTION_FILENAME:
 140                err = 0;
 141                if (unset)
 142                        *(const char **)opt->value = NULL;
 143                else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 144                        *(const char **)opt->value = (const char *)opt->defval;
 145                else
 146                        err = get_arg(p, opt, flags, (const char **)opt->value);
 147
 148                if (!err)
 149                        fix_filename(p->prefix, (const char **)opt->value);
 150                return err;
 151
 152        case OPTION_CALLBACK:
 153                if (unset)
 154                        return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 155                if (opt->flags & PARSE_OPT_NOARG)
 156                        return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 157                if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 158                        return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 159                if (get_arg(p, opt, flags, &arg))
 160                        return -1;
 161                return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 162
 163        case OPTION_INTEGER:
 164                if (unset) {
 165                        *(int *)opt->value = 0;
 166                        return 0;
 167                }
 168                if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 169                        *(int *)opt->value = opt->defval;
 170                        return 0;
 171                }
 172                if (get_arg(p, opt, flags, &arg))
 173                        return -1;
 174                *(int *)opt->value = strtol(arg, (char **)&s, 10);
 175                if (*s)
 176                        return opterror(opt, "expects a numerical value", flags);
 177                return 0;
 178
 179        case OPTION_MAGNITUDE:
 180                if (unset) {
 181                        *(unsigned long *)opt->value = 0;
 182                        return 0;
 183                }
 184                if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 185                        *(unsigned long *)opt->value = opt->defval;
 186                        return 0;
 187                }
 188                if (get_arg(p, opt, flags, &arg))
 189                        return -1;
 190                if (!git_parse_ulong(arg, opt->value))
 191                        return opterror(opt,
 192                                "expects a non-negative integer value with an optional k/m/g suffix",
 193                                flags);
 194                return 0;
 195
 196        default:
 197                die("should not happen, someone must be hit on the forehead");
 198        }
 199}
 200
 201static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 202{
 203        const struct option *all_opts = options;
 204        const struct option *numopt = NULL;
 205
 206        for (; options->type != OPTION_END; options++) {
 207                if (options->short_name == *p->opt) {
 208                        p->opt = p->opt[1] ? p->opt + 1 : NULL;
 209                        return get_value(p, options, all_opts, OPT_SHORT);
 210                }
 211
 212                /*
 213                 * Handle the numerical option later, explicit one-digit
 214                 * options take precedence over it.
 215                 */
 216                if (options->type == OPTION_NUMBER)
 217                        numopt = options;
 218        }
 219        if (numopt && isdigit(*p->opt)) {
 220                size_t len = 1;
 221                char *arg;
 222                int rc;
 223
 224                while (isdigit(p->opt[len]))
 225                        len++;
 226                arg = xmemdupz(p->opt, len);
 227                p->opt = p->opt[len] ? p->opt + len : NULL;
 228                rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 229                free(arg);
 230                return rc;
 231        }
 232        return -2;
 233}
 234
 235static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 236                          const struct option *options)
 237{
 238        const struct option *all_opts = options;
 239        const char *arg_end = strchrnul(arg, '=');
 240        const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 241        int abbrev_flags = 0, ambiguous_flags = 0;
 242
 243        for (; options->type != OPTION_END; options++) {
 244                const char *rest, *long_name = options->long_name;
 245                int flags = 0, opt_flags = 0;
 246
 247                if (!long_name)
 248                        continue;
 249
 250again:
 251                if (!skip_prefix(arg, long_name, &rest))
 252                        rest = NULL;
 253                if (options->type == OPTION_ARGUMENT) {
 254                        if (!rest)
 255                                continue;
 256                        if (*rest == '=')
 257                                return opterror(options, "takes no value", flags);
 258                        if (*rest)
 259                                continue;
 260                        p->out[p->cpidx++] = arg - 2;
 261                        return 0;
 262                }
 263                if (!rest) {
 264                        /* abbreviated? */
 265                        if (!strncmp(long_name, arg, arg_end - arg)) {
 266is_abbreviated:
 267                                if (abbrev_option) {
 268                                        /*
 269                                         * If this is abbreviated, it is
 270                                         * ambiguous. So when there is no
 271                                         * exact match later, we need to
 272                                         * error out.
 273                                         */
 274                                        ambiguous_option = abbrev_option;
 275                                        ambiguous_flags = abbrev_flags;
 276                                }
 277                                if (!(flags & OPT_UNSET) && *arg_end)
 278                                        p->opt = arg_end + 1;
 279                                abbrev_option = options;
 280                                abbrev_flags = flags ^ opt_flags;
 281                                continue;
 282                        }
 283                        /* negation allowed? */
 284                        if (options->flags & PARSE_OPT_NONEG)
 285                                continue;
 286                        /* negated and abbreviated very much? */
 287                        if (starts_with("no-", arg)) {
 288                                flags |= OPT_UNSET;
 289                                goto is_abbreviated;
 290                        }
 291                        /* negated? */
 292                        if (!starts_with(arg, "no-")) {
 293                                if (starts_with(long_name, "no-")) {
 294                                        long_name += 3;
 295                                        opt_flags |= OPT_UNSET;
 296                                        goto again;
 297                                }
 298                                continue;
 299                        }
 300                        flags |= OPT_UNSET;
 301                        if (!skip_prefix(arg + 3, long_name, &rest)) {
 302                                /* abbreviated and negated? */
 303                                if (starts_with(long_name, arg + 3))
 304                                        goto is_abbreviated;
 305                                else
 306                                        continue;
 307                        }
 308                }
 309                if (*rest) {
 310                        if (*rest != '=')
 311                                continue;
 312                        p->opt = rest + 1;
 313                }
 314                return get_value(p, options, all_opts, flags ^ opt_flags);
 315        }
 316
 317        if (ambiguous_option)
 318                return error("Ambiguous option: %s "
 319                        "(could be --%s%s or --%s%s)",
 320                        arg,
 321                        (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 322                        ambiguous_option->long_name,
 323                        (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 324                        abbrev_option->long_name);
 325        if (abbrev_option)
 326                return get_value(p, abbrev_option, all_opts, abbrev_flags);
 327        return -2;
 328}
 329
 330static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 331                            const struct option *options)
 332{
 333        const struct option *all_opts = options;
 334
 335        for (; options->type != OPTION_END; options++) {
 336                if (!(options->flags & PARSE_OPT_NODASH))
 337                        continue;
 338                if (options->short_name == arg[0] && arg[1] == '\0')
 339                        return get_value(p, options, all_opts, OPT_SHORT);
 340        }
 341        return -2;
 342}
 343
 344static void check_typos(const char *arg, const struct option *options)
 345{
 346        if (strlen(arg) < 3)
 347                return;
 348
 349        if (starts_with(arg, "no-")) {
 350                error ("did you mean `--%s` (with two dashes ?)", arg);
 351                exit(129);
 352        }
 353
 354        for (; options->type != OPTION_END; options++) {
 355                if (!options->long_name)
 356                        continue;
 357                if (starts_with(options->long_name, arg)) {
 358                        error ("did you mean `--%s` (with two dashes ?)", arg);
 359                        exit(129);
 360                }
 361        }
 362}
 363
 364static void parse_options_check(const struct option *opts)
 365{
 366        int err = 0;
 367        char short_opts[128];
 368
 369        memset(short_opts, '\0', sizeof(short_opts));
 370        for (; opts->type != OPTION_END; opts++) {
 371                if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 372                    (opts->flags & PARSE_OPT_OPTARG))
 373                        err |= optbug(opts, "uses incompatible flags "
 374                                        "LASTARG_DEFAULT and OPTARG");
 375                if (opts->short_name) {
 376                        if (0x7F <= opts->short_name)
 377                                err |= optbug(opts, "invalid short name");
 378                        else if (short_opts[opts->short_name]++)
 379                                err |= optbug(opts, "short name already used");
 380                }
 381                if (opts->flags & PARSE_OPT_NODASH &&
 382                    ((opts->flags & PARSE_OPT_OPTARG) ||
 383                     !(opts->flags & PARSE_OPT_NOARG) ||
 384                     !(opts->flags & PARSE_OPT_NONEG) ||
 385                     opts->long_name))
 386                        err |= optbug(opts, "uses feature "
 387                                        "not supported for dashless options");
 388                switch (opts->type) {
 389                case OPTION_COUNTUP:
 390                case OPTION_BIT:
 391                case OPTION_NEGBIT:
 392                case OPTION_SET_INT:
 393                case OPTION_NUMBER:
 394                        if ((opts->flags & PARSE_OPT_OPTARG) ||
 395                            !(opts->flags & PARSE_OPT_NOARG))
 396                                err |= optbug(opts, "should not accept an argument");
 397                default:
 398                        ; /* ok. (usually accepts an argument) */
 399                }
 400                if (opts->argh &&
 401                    strcspn(opts->argh, " _") != strlen(opts->argh))
 402                        err |= optbug(opts, "multi-word argh should use dash to separate words");
 403        }
 404        if (err)
 405                exit(128);
 406}
 407
 408void parse_options_start(struct parse_opt_ctx_t *ctx,
 409                         int argc, const char **argv, const char *prefix,
 410                         const struct option *options, int flags)
 411{
 412        memset(ctx, 0, sizeof(*ctx));
 413        ctx->argc = argc - 1;
 414        ctx->argv = argv + 1;
 415        ctx->out  = argv;
 416        ctx->prefix = prefix;
 417        ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 418        ctx->flags = flags;
 419        if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 420            (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 421                die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 422        parse_options_check(options);
 423}
 424
 425static int usage_with_options_internal(struct parse_opt_ctx_t *,
 426                                       const char * const *,
 427                                       const struct option *, int, int);
 428
 429int parse_options_step(struct parse_opt_ctx_t *ctx,
 430                       const struct option *options,
 431                       const char * const usagestr[])
 432{
 433        int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 434        int err = 0;
 435
 436        /* we must reset ->opt, unknown short option leave it dangling */
 437        ctx->opt = NULL;
 438
 439        for (; ctx->argc; ctx->argc--, ctx->argv++) {
 440                const char *arg = ctx->argv[0];
 441
 442                if (*arg != '-' || !arg[1]) {
 443                        if (parse_nodash_opt(ctx, arg, options) == 0)
 444                                continue;
 445                        if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 446                                return PARSE_OPT_NON_OPTION;
 447                        ctx->out[ctx->cpidx++] = ctx->argv[0];
 448                        continue;
 449                }
 450
 451                if (arg[1] != '-') {
 452                        ctx->opt = arg + 1;
 453                        if (internal_help && *ctx->opt == 'h')
 454                                goto show_usage;
 455                        switch (parse_short_opt(ctx, options)) {
 456                        case -1:
 457                                goto show_usage_error;
 458                        case -2:
 459                                if (ctx->opt)
 460                                        check_typos(arg + 1, options);
 461                                goto unknown;
 462                        }
 463                        if (ctx->opt)
 464                                check_typos(arg + 1, options);
 465                        while (ctx->opt) {
 466                                if (internal_help && *ctx->opt == 'h')
 467                                        goto show_usage;
 468                                switch (parse_short_opt(ctx, options)) {
 469                                case -1:
 470                                        goto show_usage_error;
 471                                case -2:
 472                                        /* fake a short option thing to hide the fact that we may have
 473                                         * started to parse aggregated stuff
 474                                         *
 475                                         * This is leaky, too bad.
 476                                         */
 477                                        ctx->argv[0] = xstrdup(ctx->opt - 1);
 478                                        *(char *)ctx->argv[0] = '-';
 479                                        goto unknown;
 480                                }
 481                        }
 482                        continue;
 483                }
 484
 485                if (!arg[2]) { /* "--" */
 486                        if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 487                                ctx->argc--;
 488                                ctx->argv++;
 489                        }
 490                        break;
 491                }
 492
 493                if (internal_help && !strcmp(arg + 2, "help-all"))
 494                        return usage_with_options_internal(ctx, usagestr, options, 1, 0);
 495                if (internal_help && !strcmp(arg + 2, "help"))
 496                        goto show_usage;
 497                switch (parse_long_opt(ctx, arg + 2, options)) {
 498                case -1:
 499                        goto show_usage_error;
 500                case -2:
 501                        goto unknown;
 502                }
 503                continue;
 504unknown:
 505                if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 506                        return PARSE_OPT_UNKNOWN;
 507                ctx->out[ctx->cpidx++] = ctx->argv[0];
 508                ctx->opt = NULL;
 509        }
 510        return PARSE_OPT_DONE;
 511
 512 show_usage_error:
 513        err = 1;
 514 show_usage:
 515        return usage_with_options_internal(ctx, usagestr, options, 0, err);
 516}
 517
 518int parse_options_end(struct parse_opt_ctx_t *ctx)
 519{
 520        memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 521        ctx->out[ctx->cpidx + ctx->argc] = NULL;
 522        return ctx->cpidx + ctx->argc;
 523}
 524
 525int parse_options(int argc, const char **argv, const char *prefix,
 526                  const struct option *options, const char * const usagestr[],
 527                  int flags)
 528{
 529        struct parse_opt_ctx_t ctx;
 530
 531        parse_options_start(&ctx, argc, argv, prefix, options, flags);
 532        switch (parse_options_step(&ctx, options, usagestr)) {
 533        case PARSE_OPT_HELP:
 534                exit(129);
 535        case PARSE_OPT_NON_OPTION:
 536        case PARSE_OPT_DONE:
 537                break;
 538        default: /* PARSE_OPT_UNKNOWN */
 539                if (ctx.argv[0][1] == '-') {
 540                        error("unknown option `%s'", ctx.argv[0] + 2);
 541                } else if (isascii(*ctx.opt)) {
 542                        error("unknown switch `%c'", *ctx.opt);
 543                } else {
 544                        error("unknown non-ascii option in string: `%s'",
 545                              ctx.argv[0]);
 546                }
 547                usage_with_options(usagestr, options);
 548        }
 549
 550        precompose_argv(argc, argv);
 551        return parse_options_end(&ctx);
 552}
 553
 554static int usage_argh(const struct option *opts, FILE *outfile)
 555{
 556        const char *s;
 557        int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
 558        if (opts->flags & PARSE_OPT_OPTARG)
 559                if (opts->long_name)
 560                        s = literal ? "[=%s]" : "[=<%s>]";
 561                else
 562                        s = literal ? "[%s]" : "[<%s>]";
 563        else
 564                s = literal ? " %s" : " <%s>";
 565        return utf8_fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
 566}
 567
 568#define USAGE_OPTS_WIDTH 24
 569#define USAGE_GAP         2
 570
 571static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
 572                                       const char * const *usagestr,
 573                                       const struct option *opts, int full, int err)
 574{
 575        FILE *outfile = err ? stderr : stdout;
 576
 577        if (!usagestr)
 578                return PARSE_OPT_HELP;
 579
 580        if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 581                fprintf(outfile, "cat <<\\EOF\n");
 582
 583        fprintf_ln(outfile, _("usage: %s"), _(*usagestr++));
 584        while (*usagestr && **usagestr)
 585                /* TRANSLATORS: the colon here should align with the
 586                   one in "usage: %s" translation */
 587                fprintf_ln(outfile, _("   or: %s"), _(*usagestr++));
 588        while (*usagestr) {
 589                if (**usagestr)
 590                        fprintf_ln(outfile, _("    %s"), _(*usagestr));
 591                else
 592                        putchar('\n');
 593                usagestr++;
 594        }
 595
 596        if (opts->type != OPTION_GROUP)
 597                fputc('\n', outfile);
 598
 599        for (; opts->type != OPTION_END; opts++) {
 600                size_t pos;
 601                int pad;
 602
 603                if (opts->type == OPTION_GROUP) {
 604                        fputc('\n', outfile);
 605                        if (*opts->help)
 606                                fprintf(outfile, "%s\n", _(opts->help));
 607                        continue;
 608                }
 609                if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 610                        continue;
 611
 612                pos = fprintf(outfile, "    ");
 613                if (opts->short_name) {
 614                        if (opts->flags & PARSE_OPT_NODASH)
 615                                pos += fprintf(outfile, "%c", opts->short_name);
 616                        else
 617                                pos += fprintf(outfile, "-%c", opts->short_name);
 618                }
 619                if (opts->long_name && opts->short_name)
 620                        pos += fprintf(outfile, ", ");
 621                if (opts->long_name)
 622                        pos += fprintf(outfile, "--%s", opts->long_name);
 623                if (opts->type == OPTION_NUMBER)
 624                        pos += utf8_fprintf(outfile, _("-NUM"));
 625
 626                if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
 627                    !(opts->flags & PARSE_OPT_NOARG))
 628                        pos += usage_argh(opts, outfile);
 629
 630                if (pos <= USAGE_OPTS_WIDTH)
 631                        pad = USAGE_OPTS_WIDTH - pos;
 632                else {
 633                        fputc('\n', outfile);
 634                        pad = USAGE_OPTS_WIDTH;
 635                }
 636                fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", _(opts->help));
 637        }
 638        fputc('\n', outfile);
 639
 640        if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 641                fputs("EOF\n", outfile);
 642
 643        return PARSE_OPT_HELP;
 644}
 645
 646void NORETURN usage_with_options(const char * const *usagestr,
 647                        const struct option *opts)
 648{
 649        usage_with_options_internal(NULL, usagestr, opts, 0, 1);
 650        exit(129);
 651}
 652
 653void NORETURN usage_msg_opt(const char *msg,
 654                   const char * const *usagestr,
 655                   const struct option *options)
 656{
 657        fprintf(stderr, "%s\n\n", msg);
 658        usage_with_options(usagestr, options);
 659}
 660
 661#undef opterror
 662int opterror(const struct option *opt, const char *reason, int flags)
 663{
 664        if (flags & OPT_SHORT)
 665                return error("switch `%c' %s", opt->short_name, reason);
 666        if (flags & OPT_UNSET)
 667                return error("option `no-%s' %s", opt->long_name, reason);
 668        return error("option `%s' %s", opt->long_name, reason);
 669}