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