parse-options.c

   1 #include "git-compat-util.h"
   2 #include "parse-options.h"
   3 #include "abspath.h"
   4 #include "parse.h"
   5 #include "commit.h"
   6 #include "color.h"
   7 #include "gettext.h"
   8 #include "strbuf.h"
   9 #include "string-list.h"
  10 #include "utf8.h"
  11
  12 static int disallow_abbreviated_options;
  13
  14 enum opt_parsed {
  15         OPT_LONG  = 0,
  16         OPT_SHORT = 1<<0,
  17         OPT_UNSET = 1<<1,
  18 };
  19
  20 static void optbug(const struct option *opt, const char *reason)
  21 {
  22         if (opt->long_name && opt->short_name)
  23                 bug("switch '%c' (--%s) %s", opt->short_name,
  24                     opt->long_name, reason);
  25         else if (opt->long_name)
  26                 bug("option '%s' %s", opt->long_name, reason);
  27         else
  28                 bug("switch '%c' %s", opt->short_name, reason);
  29 }
  30
  31 static const char *optname(const struct option *opt, enum opt_parsed flags)
  32 {
  33         static struct strbuf sb = STRBUF_INIT;
  34
  35         strbuf_reset(&sb);
  36         if (flags & OPT_SHORT)
  37                 strbuf_addf(&sb, "switch `%c'", opt->short_name);
  38         else if (flags & OPT_UNSET)
  39                 strbuf_addf(&sb, "option `no-%s'", opt->long_name);
  40         else if (flags == OPT_LONG)
  41                 strbuf_addf(&sb, "option `%s'", opt->long_name);
  42         else
  43                 BUG("optname() got unknown flags %d", flags);
  44
  45         return sb.buf;
  46 }
  47
  48 static enum parse_opt_result get_arg(struct parse_opt_ctx_t *p,
  49                                      const struct option *opt,
  50                                      enum opt_parsed flags, const char **arg)
  51 {
  52         if (p->opt) {
  53                 *arg = p->opt;
  54                 p->opt = NULL;
  55         } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
  56                 *arg = (const char *)opt->defval;
  57         } else if (p->argc > 1) {
  58                 p->argc--;
  59                 *arg = *++p->argv;
  60         } else
  61                 return error(_("%s requires a value"), optname(opt, flags));
  62         return 0;
  63 }
  64
  65 static void fix_filename(const char *prefix, char **file)
  66 {
  67         if (!file || !*file)
  68                 ; /* leave as NULL */
  69         else
  70                 *file = prefix_filename_except_for_dash(prefix, *file);
  71 }
  72
  73 static enum parse_opt_result opt_command_mode_error(
  74         const struct option *opt,
  75         const struct option *all_opts,
  76         enum opt_parsed flags)
  77 {
  78         const struct option *that;
  79         struct strbuf that_name = STRBUF_INIT;
  80
  81         /*
  82          * Find the other option that was used to set the variable
  83          * already, and report that this is not compatible with it.
  84          */
  85         for (that = all_opts; that->type != OPTION_END; that++) {
  86                 if (that == opt ||
  87                     !(that->flags & PARSE_OPT_CMDMODE) ||
  88                     that->value != opt->value ||
  89                     that->defval != *(int *)opt->value)
  90                         continue;
  91
  92                 if (that->long_name)
  93                         strbuf_addf(&that_name, "--%s", that->long_name);
  94                 else
  95                         strbuf_addf(&that_name, "-%c", that->short_name);
  96                 error(_("%s is incompatible with %s"),
  97                       optname(opt, flags), that_name.buf);
  98                 strbuf_release(&that_name);
  99                 return PARSE_OPT_ERROR;
 100         }
 101         return error(_("%s : incompatible with something else"),
 102                      optname(opt, flags));
 103 }
 104
 105 static enum parse_opt_result get_value(struct parse_opt_ctx_t *p,
 106                                        const struct option *opt,
 107                                        const struct option *all_opts,
 108                                        enum opt_parsed flags)
 109 {
 110         const char *s, *arg;
 111         const int unset = flags & OPT_UNSET;
 112         int err;
 113
 114         if (unset && p->opt)
 115                 return error(_("%s takes no value"), optname(opt, flags));
 116         if (unset && (opt->flags & PARSE_OPT_NONEG))
 117                 return error(_("%s isn't available"), optname(opt, flags));
 118         if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
 119                 return error(_("%s takes no value"), optname(opt, flags));
 120
 121         /*
 122          * Giving the same mode option twice, although unnecessary,
 123          * is not a grave error, so let it pass.
 124          */
 125         if ((opt->flags & PARSE_OPT_CMDMODE) &&
 126             *(int *)opt->value && *(int *)opt->value != opt->defval)
 127                 return opt_command_mode_error(opt, all_opts, flags);
 128
 129         switch (opt->type) {
 130         case OPTION_LOWLEVEL_CALLBACK:
 131                 return opt->ll_callback(p, opt, NULL, unset);
 132
 133         case OPTION_BIT:
 134                 if (unset)
 135                         *(int *)opt->value &= ~opt->defval;
 136                 else
 137                         *(int *)opt->value |= opt->defval;
 138                 return 0;
 139
 140         case OPTION_NEGBIT:
 141                 if (unset)
 142                         *(int *)opt->value |= opt->defval;
 143                 else
 144                         *(int *)opt->value &= ~opt->defval;
 145                 return 0;
 146
 147         case OPTION_BITOP:
 148                 if (unset)
 149                         BUG("BITOP can't have unset form");
 150                 *(int *)opt->value &= ~opt->extra;
 151                 *(int *)opt->value |= opt->defval;
 152                 return 0;
 153
 154         case OPTION_COUNTUP:
 155                 if (*(int *)opt->value < 0)
 156                         *(int *)opt->value = 0;
 157                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
 158                 return 0;
 159
 160         case OPTION_SET_INT:
 161                 *(int *)opt->value = unset ? 0 : opt->defval;
 162                 return 0;
 163
 164         case OPTION_STRING:
 165                 if (unset)
 166                         *(const char **)opt->value = NULL;
 167                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 168                         *(const char **)opt->value = (const char *)opt->defval;
 169                 else
 170                         return get_arg(p, opt, flags, (const char **)opt->value);
 171                 return 0;
 172
 173         case OPTION_FILENAME:
 174                 err = 0;
 175                 if (unset)
 176                         *(const char **)opt->value = NULL;
 177                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 178                         *(const char **)opt->value = (const char *)opt->defval;
 179                 else
 180                         err = get_arg(p, opt, flags, (const char **)opt->value);
 181
 182                 if (!err)
 183                         fix_filename(p->prefix, (char **)opt->value);
 184                 return err;
 185
 186         case OPTION_CALLBACK:
 187         {
 188                 const char *p_arg = NULL;
 189                 int p_unset;
 190
 191                 if (unset)
 192                         p_unset = 1;
 193                 else if (opt->flags & PARSE_OPT_NOARG)
 194                         p_unset = 0;
 195                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 196                         p_unset = 0;
 197                 else if (get_arg(p, opt, flags, &arg))
 198                         return -1;
 199                 else {
 200                         p_unset = 0;
 201                         p_arg = arg;
 202                 }
 203                 if (opt->callback)
 204                         return (*opt->callback)(opt, p_arg, p_unset) ? (-1) : 0;
 205                 else
 206                         return (*opt->ll_callback)(p, opt, p_arg, p_unset);
 207         }
 208         case OPTION_INTEGER:
 209                 if (unset) {
 210                         *(int *)opt->value = 0;
 211                         return 0;
 212                 }
 213                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 214                         *(int *)opt->value = opt->defval;
 215                         return 0;
 216                 }
 217                 if (get_arg(p, opt, flags, &arg))
 218                         return -1;
 219                 if (!*arg)
 220                         return error(_("%s expects a numerical value"),
 221                                      optname(opt, flags));
 222                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 223                 if (*s)
 224                         return error(_("%s expects a numerical value"),
 225                                      optname(opt, flags));
 226                 return 0;
 227
 228         case OPTION_MAGNITUDE:
 229                 if (unset) {
 230                         *(unsigned long *)opt->value = 0;
 231                         return 0;
 232                 }
 233                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 234                         *(unsigned long *)opt->value = opt->defval;
 235                         return 0;
 236                 }
 237                 if (get_arg(p, opt, flags, &arg))
 238                         return -1;
 239                 if (!git_parse_ulong(arg, opt->value))
 240                         return error(_("%s expects a non-negative integer value"
 241                                        " with an optional k/m/g suffix"),
 242                                      optname(opt, flags));
 243                 return 0;
 244
 245         default:
 246                 BUG("opt->type %d should not happen", opt->type);
 247         }
 248 }
 249
 250 static enum parse_opt_result parse_short_opt(struct parse_opt_ctx_t *p,
 251                                              const struct option *options)
 252 {
 253         const struct option *all_opts = options;
 254         const struct option *numopt = NULL;
 255
 256         for (; options->type != OPTION_END; options++) {
 257                 if (options->short_name == *p->opt) {
 258                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 259                         return get_value(p, options, all_opts, OPT_SHORT);
 260                 }
 261
 262                 /*
 263                  * Handle the numerical option later, explicit one-digit
 264                  * options take precedence over it.
 265                  */
 266                 if (options->type == OPTION_NUMBER)
 267                         numopt = options;
 268         }
 269         if (numopt && isdigit(*p->opt)) {
 270                 size_t len = 1;
 271                 char *arg;
 272                 int rc;
 273
 274                 while (isdigit(p->opt[len]))
 275                         len++;
 276                 arg = xmemdupz(p->opt, len);
 277                 p->opt = p->opt[len] ? p->opt + len : NULL;
 278                 if (numopt->callback)
 279                         rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 280                 else
 281                         rc = (*numopt->ll_callback)(p, numopt, arg, 0);
 282                 free(arg);
 283                 return rc;
 284         }
 285         return PARSE_OPT_UNKNOWN;
 286 }
 287
 288 static int has_string(const char *it, const char **array)
 289 {
 290         while (*array)
 291                 if (!strcmp(it, *(array++)))
 292                         return 1;
 293         return 0;
 294 }
 295
 296 static int is_alias(struct parse_opt_ctx_t *ctx,
 297                     const struct option *one_opt,
 298                     const struct option *another_opt)
 299 {
 300         const char **group;
 301
 302         if (!ctx->alias_groups)
 303                 return 0;
 304
 305         if (!one_opt->long_name || !another_opt->long_name)
 306                 return 0;
 307
 308         for (group = ctx->alias_groups; *group; group += 3) {
 309                 /* it and other are from the same family? */
 310                 if (has_string(one_opt->long_name, group) &&
 311                     has_string(another_opt->long_name, group))
 312                         return 1;
 313         }
 314         return 0;
 315 }
 316
 317 static enum parse_opt_result parse_long_opt(
 318         struct parse_opt_ctx_t *p, const char *arg,
 319         const struct option *options)
 320 {
 321         const struct option *all_opts = options;
 322         const char *arg_end = strchrnul(arg, '=');
 323         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 324         enum opt_parsed abbrev_flags = OPT_LONG, ambiguous_flags = OPT_LONG;
 325
 326         for (; options->type != OPTION_END; options++) {
 327                 const char *rest, *long_name = options->long_name;
 328                 enum opt_parsed flags = OPT_LONG, opt_flags = OPT_LONG;
 329
 330                 if (options->type == OPTION_SUBCOMMAND)
 331                         continue;
 332                 if (!long_name)
 333                         continue;
 334
 335 again:
 336                 if (!skip_prefix(arg, long_name, &rest))
 337                         rest = NULL;
 338                 if (!rest) {
 339                         /* abbreviated? */
 340                         if (!(p->flags & PARSE_OPT_KEEP_UNKNOWN_OPT) &&
 341                             !strncmp(long_name, arg, arg_end - arg)) {
 342 is_abbreviated:
 343                                 if (abbrev_option &&
 344                                     !is_alias(p, abbrev_option, options)) {
 345                                         /*
 346                                          * If this is abbreviated, it is
 347                                          * ambiguous. So when there is no
 348                                          * exact match later, we need to
 349                                          * error out.
 350                                          */
 351                                         ambiguous_option = abbrev_option;
 352                                         ambiguous_flags = abbrev_flags;
 353                                 }
 354                                 if (!(flags & OPT_UNSET) && *arg_end)
 355                                         p->opt = arg_end + 1;
 356                                 abbrev_option = options;
 357                                 abbrev_flags = flags ^ opt_flags;
 358                                 continue;
 359                         }
 360                         /* negation allowed? */
 361                         if (options->flags & PARSE_OPT_NONEG)
 362                                 continue;
 363                         /* negated and abbreviated very much? */
 364                         if (starts_with("no-", arg)) {
 365                                 flags |= OPT_UNSET;
 366                                 goto is_abbreviated;
 367                         }
 368                         /* negated? */
 369                         if (!starts_with(arg, "no-")) {
 370                                 if (skip_prefix(long_name, "no-", &long_name)) {
 371                                         opt_flags |= OPT_UNSET;
 372                                         goto again;
 373                                 }
 374                                 continue;
 375                         }
 376                         flags |= OPT_UNSET;
 377                         if (!skip_prefix(arg + 3, long_name, &rest)) {
 378                                 /* abbreviated and negated? */
 379                                 if (starts_with(long_name, arg + 3))
 380                                         goto is_abbreviated;
 381                                 else
 382                                         continue;
 383                         }
 384                 }
 385                 if (*rest) {
 386                         if (*rest != '=')
 387                                 continue;
 388                         p->opt = rest + 1;
 389                 }
 390                 return get_value(p, options, all_opts, flags ^ opt_flags);
 391         }
 392
 393         if (disallow_abbreviated_options && (ambiguous_option || abbrev_option))
 394                 die("disallowed abbreviated or ambiguous option '%.*s'",
 395                     (int)(arg_end - arg), arg);
 396
 397         if (ambiguous_option) {
 398                 error(_("ambiguous option: %s "
 399                         "(could be --%s%s or --%s%s)"),
 400                         arg,
 401                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 402                         ambiguous_option->long_name,
 403                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 404                         abbrev_option->long_name);
 405                 return PARSE_OPT_HELP;
 406         }
 407         if (abbrev_option)
 408                 return get_value(p, abbrev_option, all_opts, abbrev_flags);
 409         return PARSE_OPT_UNKNOWN;
 410 }
 411
 412 static enum parse_opt_result parse_nodash_opt(struct parse_opt_ctx_t *p,
 413                                               const char *arg,
 414                                               const struct option *options)
 415 {
 416         const struct option *all_opts = options;
 417
 418         for (; options->type != OPTION_END; options++) {
 419                 if (!(options->flags & PARSE_OPT_NODASH))
 420                         continue;
 421                 if (options->short_name == arg[0] && arg[1] == '\0')
 422                         return get_value(p, options, all_opts, OPT_SHORT);
 423         }
 424         return PARSE_OPT_ERROR;
 425 }
 426
 427 static enum parse_opt_result parse_subcommand(const char *arg,
 428                                               const struct option *options)
 429 {
 430         for (; options->type != OPTION_END; options++)
 431                 if (options->type == OPTION_SUBCOMMAND &&
 432                     !strcmp(options->long_name, arg)) {
 433                         *(parse_opt_subcommand_fn **)options->value = options->subcommand_fn;
 434                         return PARSE_OPT_SUBCOMMAND;
 435                 }
 436
 437         return PARSE_OPT_UNKNOWN;
 438 }
 439
 440 static void check_typos(const char *arg, const struct option *options)
 441 {
 442         if (strlen(arg) < 3)
 443                 return;
 444
 445         if (starts_with(arg, "no-")) {
 446                 error(_("did you mean `--%s` (with two dashes)?"), arg);
 447                 exit(129);
 448         }
 449
 450         for (; options->type != OPTION_END; options++) {
 451                 if (!options->long_name)
 452                         continue;
 453                 if (starts_with(options->long_name, arg)) {
 454                         error(_("did you mean `--%s` (with two dashes)?"), arg);
 455                         exit(129);
 456                 }
 457         }
 458 }
 459
 460 static void parse_options_check(const struct option *opts)
 461 {
 462         char short_opts[128];
 463         void *subcommand_value = NULL;
 464
 465         memset(short_opts, '\0', sizeof(short_opts));
 466         for (; opts->type != OPTION_END; opts++) {
 467                 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 468                     (opts->flags & PARSE_OPT_OPTARG))
 469                         optbug(opts, "uses incompatible flags "
 470                                "LASTARG_DEFAULT and OPTARG");
 471                 if (opts->short_name) {
 472                         if (0x7F <= opts->short_name)
 473                                 optbug(opts, "invalid short name");
 474                         else if (short_opts[opts->short_name]++)
 475                                 optbug(opts, "short name already used");
 476                 }
 477                 if (opts->flags & PARSE_OPT_NODASH &&
 478                     ((opts->flags & PARSE_OPT_OPTARG) ||
 479                      !(opts->flags & PARSE_OPT_NOARG) ||
 480                      !(opts->flags & PARSE_OPT_NONEG) ||
 481                      opts->long_name))
 482                         optbug(opts, "uses feature "
 483                                "not supported for dashless options");
 484                 if (opts->type == OPTION_SET_INT && !opts->defval &&
 485                     opts->long_name && !(opts->flags & PARSE_OPT_NONEG))
 486                         optbug(opts, "OPTION_SET_INT 0 should not be negatable");
 487                 switch (opts->type) {
 488                 case OPTION_COUNTUP:
 489                 case OPTION_BIT:
 490                 case OPTION_NEGBIT:
 491                 case OPTION_SET_INT:
 492                 case OPTION_NUMBER:
 493                         if ((opts->flags & PARSE_OPT_OPTARG) ||
 494                             !(opts->flags & PARSE_OPT_NOARG))
 495                                 optbug(opts, "should not accept an argument");
 496                         break;
 497                 case OPTION_CALLBACK:
 498                         if (!opts->callback && !opts->ll_callback)
 499                                 optbug(opts, "OPTION_CALLBACK needs one callback");
 500                         else if (opts->callback && opts->ll_callback)
 501                                 optbug(opts, "OPTION_CALLBACK can't have two callbacks");
 502                         break;
 503                 case OPTION_LOWLEVEL_CALLBACK:
 504                         if (!opts->ll_callback)
 505                                 optbug(opts, "OPTION_LOWLEVEL_CALLBACK needs a callback");
 506                         if (opts->callback)
 507                                 optbug(opts, "OPTION_LOWLEVEL_CALLBACK needs no high level callback");
 508                         break;
 509                 case OPTION_ALIAS:
 510                         optbug(opts, "OPT_ALIAS() should not remain at this point. "
 511                                "Are you using parse_options_step() directly?\n"
 512                                "That case is not supported yet.");
 513                         break;
 514                 case OPTION_SUBCOMMAND:
 515                         if (!opts->value || !opts->subcommand_fn)
 516                                 optbug(opts, "OPTION_SUBCOMMAND needs a value and a subcommand function");
 517                         if (!subcommand_value)
 518                                 subcommand_value = opts->value;
 519                         else if (subcommand_value != opts->value)
 520                                 optbug(opts, "all OPTION_SUBCOMMANDs need the same value");
 521                         break;
 522                 default:
 523                         ; /* ok. (usually accepts an argument) */
 524                 }
 525                 if (opts->argh &&
 526                     strcspn(opts->argh, " _") != strlen(opts->argh))
 527                         optbug(opts, "multi-word argh should use dash to separate words");
 528         }
 529         BUG_if_bug("invalid 'struct option'");
 530 }
 531
 532 static int has_subcommands(const struct option *options)
 533 {
 534         for (; options->type != OPTION_END; options++)
 535                 if (options->type == OPTION_SUBCOMMAND)
 536                         return 1;
 537         return 0;
 538 }
 539
 540 static void parse_options_start_1(struct parse_opt_ctx_t *ctx,
 541                                   int argc, const char **argv, const char *prefix,
 542                                   const struct option *options,
 543                                   enum parse_opt_flags flags)
 544 {
 545         ctx->argc = argc;
 546         ctx->argv = argv;
 547         if (!(flags & PARSE_OPT_ONE_SHOT)) {
 548                 ctx->argc--;
 549                 ctx->argv++;
 550         }
 551         ctx->total = ctx->argc;
 552         ctx->out   = argv;
 553         ctx->prefix = prefix;
 554         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 555         ctx->flags = flags;
 556         ctx->has_subcommands = has_subcommands(options);
 557         if (!ctx->has_subcommands && (flags & PARSE_OPT_SUBCOMMAND_OPTIONAL))
 558                 BUG("Using PARSE_OPT_SUBCOMMAND_OPTIONAL without subcommands");
 559         if (ctx->has_subcommands) {
 560                 if (flags & PARSE_OPT_STOP_AT_NON_OPTION)
 561                         BUG("subcommands are incompatible with PARSE_OPT_STOP_AT_NON_OPTION");
 562                 if (!(flags & PARSE_OPT_SUBCOMMAND_OPTIONAL)) {
 563                         if (flags & PARSE_OPT_KEEP_UNKNOWN_OPT)
 564                                 BUG("subcommands are incompatible with PARSE_OPT_KEEP_UNKNOWN_OPT unless in combination with PARSE_OPT_SUBCOMMAND_OPTIONAL");
 565                         if (flags & PARSE_OPT_KEEP_DASHDASH)
 566                                 BUG("subcommands are incompatible with PARSE_OPT_KEEP_DASHDASH unless in combination with PARSE_OPT_SUBCOMMAND_OPTIONAL");
 567                 }
 568         }
 569         if ((flags & PARSE_OPT_KEEP_UNKNOWN_OPT) &&
 570             (flags & PARSE_OPT_STOP_AT_NON_OPTION) &&
 571             !(flags & PARSE_OPT_ONE_SHOT))
 572                 BUG("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 573         if ((flags & PARSE_OPT_ONE_SHOT) &&
 574             (flags & PARSE_OPT_KEEP_ARGV0))
 575                 BUG("Can't keep argv0 if you don't have it");
 576         parse_options_check(options);
 577 }
 578
 579 void parse_options_start(struct parse_opt_ctx_t *ctx,
 580                          int argc, const char **argv, const char *prefix,
 581                          const struct option *options,
 582                          enum parse_opt_flags flags)
 583 {
 584         memset(ctx, 0, sizeof(*ctx));
 585         parse_options_start_1(ctx, argc, argv, prefix, options, flags);
 586 }
 587
 588 static void show_negated_gitcomp(const struct option *opts, int show_all,
 589                                  int nr_noopts)
 590 {
 591         int printed_dashdash = 0;
 592
 593         for (; opts->type != OPTION_END; opts++) {
 594                 int has_unset_form = 0;
 595                 const char *name;
 596
 597                 if (!opts->long_name)
 598                         continue;
 599                 if (!show_all &&
 600                         (opts->flags & (PARSE_OPT_HIDDEN | PARSE_OPT_NOCOMPLETE)))
 601                         continue;
 602                 if (opts->flags & PARSE_OPT_NONEG)
 603                         continue;
 604
 605                 switch (opts->type) {
 606                 case OPTION_STRING:
 607                 case OPTION_FILENAME:
 608                 case OPTION_INTEGER:
 609                 case OPTION_MAGNITUDE:
 610                 case OPTION_CALLBACK:
 611                 case OPTION_BIT:
 612                 case OPTION_NEGBIT:
 613                 case OPTION_COUNTUP:
 614                 case OPTION_SET_INT:
 615                         has_unset_form = 1;
 616                         break;
 617                 default:
 618                         break;
 619                 }
 620                 if (!has_unset_form)
 621                         continue;
 622
 623                 if (skip_prefix(opts->long_name, "no-", &name)) {
 624                         if (nr_noopts < 0)
 625                                 printf(" --%s", name);
 626                 } else if (nr_noopts >= 0) {
 627                         if (nr_noopts && !printed_dashdash) {
 628                                 printf(" --");
 629                                 printed_dashdash = 1;
 630                         }
 631                         printf(" --no-%s", opts->long_name);
 632                         nr_noopts++;
 633                 }
 634         }
 635 }
 636
 637 static int show_gitcomp(const struct option *opts, int show_all)
 638 {
 639         const struct option *original_opts = opts;
 640         int nr_noopts = 0;
 641
 642         for (; opts->type != OPTION_END; opts++) {
 643                 const char *prefix = "--";
 644                 const char *suffix = "";
 645
 646                 if (!opts->long_name)
 647                         continue;
 648                 if (!show_all &&
 649                         (opts->flags & (PARSE_OPT_HIDDEN | PARSE_OPT_NOCOMPLETE | PARSE_OPT_FROM_ALIAS)))
 650                         continue;
 651
 652                 switch (opts->type) {
 653                 case OPTION_SUBCOMMAND:
 654                         prefix = "";
 655                         break;
 656                 case OPTION_GROUP:
 657                         continue;
 658                 case OPTION_STRING:
 659                 case OPTION_FILENAME:
 660                 case OPTION_INTEGER:
 661                 case OPTION_MAGNITUDE:
 662                 case OPTION_CALLBACK:
 663                         if (opts->flags & PARSE_OPT_NOARG)
 664                                 break;
 665                         if (opts->flags & PARSE_OPT_OPTARG)
 666                                 break;
 667                         if (opts->flags & PARSE_OPT_LASTARG_DEFAULT)
 668                                 break;
 669                         suffix = "=";
 670                         break;
 671                 default:
 672                         break;
 673                 }
 674                 if (opts->flags & PARSE_OPT_COMP_ARG)
 675                         suffix = "=";
 676                 if (starts_with(opts->long_name, "no-"))
 677                         nr_noopts++;
 678                 printf("%s%s%s%s", opts == original_opts ? "" : " ",
 679                        prefix, opts->long_name, suffix);
 680         }
 681         show_negated_gitcomp(original_opts, show_all, -1);
 682         show_negated_gitcomp(original_opts, show_all, nr_noopts);
 683         fputc('\n', stdout);
 684         return PARSE_OPT_COMPLETE;
 685 }
 686
 687 /*
 688  * Scan and may produce a new option[] array, which should be used
 689  * instead of the original 'options'.
 690  *
 691  * Right now this is only used to preprocess and substitute
 692  * OPTION_ALIAS.
 693  *
 694  * The returned options should be freed using free_preprocessed_options.
 695  */
 696 static struct option *preprocess_options(struct parse_opt_ctx_t *ctx,
 697                                          const struct option *options)
 698 {
 699         struct option *newopt;
 700         int i, nr, alias;
 701         int nr_aliases = 0;
 702
 703         for (nr = 0; options[nr].type != OPTION_END; nr++) {
 704                 if (options[nr].type == OPTION_ALIAS)
 705                         nr_aliases++;
 706         }
 707
 708         if (!nr_aliases)
 709                 return NULL;
 710
 711         DUP_ARRAY(newopt, options, nr + 1);
 712
 713         /* each alias has two string pointers and NULL */
 714         CALLOC_ARRAY(ctx->alias_groups, 3 * (nr_aliases + 1));
 715
 716         for (alias = 0, i = 0; i < nr; i++) {
 717                 int short_name;
 718                 const char *long_name;
 719                 const char *source;
 720                 struct strbuf help = STRBUF_INIT;
 721                 int j;
 722
 723                 if (newopt[i].type != OPTION_ALIAS)
 724                         continue;
 725
 726                 short_name = newopt[i].short_name;
 727                 long_name = newopt[i].long_name;
 728                 source = newopt[i].value;
 729
 730                 if (!long_name)
 731                         BUG("An alias must have long option name");
 732                 strbuf_addf(&help, _("alias of --%s"), source);
 733
 734                 for (j = 0; j < nr; j++) {
 735                         const char *name = options[j].long_name;
 736
 737                         if (!name || strcmp(name, source))
 738                                 continue;
 739
 740                         if (options[j].type == OPTION_ALIAS)
 741                                 BUG("No please. Nested aliases are not supported.");
 742
 743                         memcpy(newopt + i, options + j, sizeof(*newopt));
 744                         newopt[i].short_name = short_name;
 745                         newopt[i].long_name = long_name;
 746                         newopt[i].help = strbuf_detach(&help, NULL);
 747                         newopt[i].flags |= PARSE_OPT_FROM_ALIAS;
 748                         break;
 749                 }
 750
 751                 if (j == nr)
 752                         BUG("could not find source option '%s' of alias '%s'",
 753                             source, newopt[i].long_name);
 754                 ctx->alias_groups[alias * 3 + 0] = newopt[i].long_name;
 755                 ctx->alias_groups[alias * 3 + 1] = options[j].long_name;
 756                 ctx->alias_groups[alias * 3 + 2] = NULL;
 757                 alias++;
 758         }
 759
 760         return newopt;
 761 }
 762
 763 static void free_preprocessed_options(struct option *options)
 764 {
 765         int i;
 766
 767         if (!options)
 768                 return;
 769
 770         for (i = 0; options[i].type != OPTION_END; i++) {
 771                 if (options[i].flags & PARSE_OPT_FROM_ALIAS)
 772                         free((void *)options[i].help);
 773         }
 774         free(options);
 775 }
 776
 777 static enum parse_opt_result usage_with_options_internal(struct parse_opt_ctx_t *,
 778                                                          const char * const *,
 779                                                          const struct option *,
 780                                                          int, int);
 781
 782 enum parse_opt_result parse_options_step(struct parse_opt_ctx_t *ctx,
 783                                          const struct option *options,
 784                                          const char * const usagestr[])
 785 {
 786         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 787
 788         /* we must reset ->opt, unknown short option leave it dangling */
 789         ctx->opt = NULL;
 790
 791         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 792                 const char *arg = ctx->argv[0];
 793
 794                 if (ctx->flags & PARSE_OPT_ONE_SHOT &&
 795                     ctx->argc != ctx->total)
 796                         break;
 797
 798                 if (*arg != '-' || !arg[1]) {
 799                         if (parse_nodash_opt(ctx, arg, options) == 0)
 800                                 continue;
 801                         if (!ctx->has_subcommands) {
 802                                 if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 803                                         return PARSE_OPT_NON_OPTION;
 804                                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 805                                 continue;
 806                         }
 807                         switch (parse_subcommand(arg, options)) {
 808                         case PARSE_OPT_SUBCOMMAND:
 809                                 return PARSE_OPT_SUBCOMMAND;
 810                         case PARSE_OPT_UNKNOWN:
 811                                 if (ctx->flags & PARSE_OPT_SUBCOMMAND_OPTIONAL)
 812                                         /*
 813                                          * arg is neither a short or long
 814                                          * option nor a subcommand.  Since
 815                                          * this command has a default
 816                                          * operation mode, we have to treat
 817                                          * this arg and all remaining args
 818                                          * as args meant to that default
 819                                          * operation mode.
 820                                          * So we are done parsing.
 821                                          */
 822                                         return PARSE_OPT_DONE;
 823                                 error(_("unknown subcommand: `%s'"), arg);
 824                                 usage_with_options(usagestr, options);
 825                         case PARSE_OPT_COMPLETE:
 826                         case PARSE_OPT_HELP:
 827                         case PARSE_OPT_ERROR:
 828                         case PARSE_OPT_DONE:
 829                         case PARSE_OPT_NON_OPTION:
 830                                 /* Impossible. */
 831                                 BUG("parse_subcommand() cannot return these");
 832                         }
 833                 }
 834
 835                 /* lone -h asks for help */
 836                 if (internal_help && ctx->total == 1 && !strcmp(arg + 1, "h"))
 837                         goto show_usage;
 838
 839                 /*
 840                  * lone --git-completion-helper and --git-completion-helper-all
 841                  * are asked by git-completion.bash
 842                  */
 843                 if (ctx->total == 1 && !strcmp(arg, "--git-completion-helper"))
 844                         return show_gitcomp(options, 0);
 845                 if (ctx->total == 1 && !strcmp(arg, "--git-completion-helper-all"))
 846                         return show_gitcomp(options, 1);
 847
 848                 if (arg[1] != '-') {
 849                         ctx->opt = arg + 1;
 850                         switch (parse_short_opt(ctx, options)) {
 851                         case PARSE_OPT_ERROR:
 852                                 return PARSE_OPT_ERROR;
 853                         case PARSE_OPT_UNKNOWN:
 854                                 if (ctx->opt)
 855                                         check_typos(arg + 1, options);
 856                                 if (internal_help && *ctx->opt == 'h')
 857                                         goto show_usage;
 858                                 goto unknown;
 859                         case PARSE_OPT_NON_OPTION:
 860                         case PARSE_OPT_SUBCOMMAND:
 861                         case PARSE_OPT_HELP:
 862                         case PARSE_OPT_COMPLETE:
 863                                 BUG("parse_short_opt() cannot return these");
 864                         case PARSE_OPT_DONE:
 865                                 break;
 866                         }
 867                         if (ctx->opt)
 868                                 check_typos(arg + 1, options);
 869                         while (ctx->opt) {
 870                                 switch (parse_short_opt(ctx, options)) {
 871                                 case PARSE_OPT_ERROR:
 872                                         return PARSE_OPT_ERROR;
 873                                 case PARSE_OPT_UNKNOWN:
 874                                         if (internal_help && *ctx->opt == 'h')
 875                                                 goto show_usage;
 876
 877                                         /* fake a short option thing to hide the fact that we may have
 878                                          * started to parse aggregated stuff
 879                                          *
 880                                          * This is leaky, too bad.
 881                                          */
 882                                         ctx->argv[0] = xstrdup(ctx->opt - 1);
 883                                         *(char *)ctx->argv[0] = '-';
 884                                         goto unknown;
 885                                 case PARSE_OPT_NON_OPTION:
 886                                 case PARSE_OPT_SUBCOMMAND:
 887                                 case PARSE_OPT_COMPLETE:
 888                                 case PARSE_OPT_HELP:
 889                                         BUG("parse_short_opt() cannot return these");
 890                                 case PARSE_OPT_DONE:
 891                                         break;
 892                                 }
 893                         }
 894                         continue;
 895                 }
 896
 897                 if (!arg[2] /* "--" */ ||
 898                     !strcmp(arg + 2, "end-of-options")) {
 899                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 900                                 ctx->argc--;
 901                                 ctx->argv++;
 902                         }
 903                         break;
 904                 }
 905
 906                 if (internal_help && !strcmp(arg + 2, "help-all"))
 907                         return usage_with_options_internal(ctx, usagestr, options, 1, 0);
 908                 if (internal_help && !strcmp(arg + 2, "help"))
 909                         goto show_usage;
 910                 switch (parse_long_opt(ctx, arg + 2, options)) {
 911                 case PARSE_OPT_ERROR:
 912                         return PARSE_OPT_ERROR;
 913                 case PARSE_OPT_UNKNOWN:
 914                         goto unknown;
 915                 case PARSE_OPT_HELP:
 916                         goto show_usage;
 917                 case PARSE_OPT_NON_OPTION:
 918                 case PARSE_OPT_SUBCOMMAND:
 919                 case PARSE_OPT_COMPLETE:
 920                         BUG("parse_long_opt() cannot return these");
 921                 case PARSE_OPT_DONE:
 922                         break;
 923                 }
 924                 continue;
 925 unknown:
 926                 if (ctx->flags & PARSE_OPT_ONE_SHOT)
 927                         break;
 928                 if (ctx->has_subcommands &&
 929                     (ctx->flags & PARSE_OPT_SUBCOMMAND_OPTIONAL) &&
 930                     (ctx->flags & PARSE_OPT_KEEP_UNKNOWN_OPT)) {
 931                         /*
 932                          * Found an unknown option given to a command with
 933                          * subcommands that has a default operation mode:
 934                          * we treat this option and all remaining args as
 935                          * arguments meant to that default operation mode.
 936                          * So we are done parsing.
 937                          */
 938                         return PARSE_OPT_DONE;
 939                 }
 940                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN_OPT))
 941                         return PARSE_OPT_UNKNOWN;
 942                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 943                 ctx->opt = NULL;
 944         }
 945         return PARSE_OPT_DONE;
 946
 947  show_usage:
 948         return usage_with_options_internal(ctx, usagestr, options, 0, 0);
 949 }
 950
 951 int parse_options_end(struct parse_opt_ctx_t *ctx)
 952 {
 953         if (ctx->flags & PARSE_OPT_ONE_SHOT)
 954                 return ctx->total - ctx->argc;
 955
 956         MOVE_ARRAY(ctx->out + ctx->cpidx, ctx->argv, ctx->argc);
 957         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 958         return ctx->cpidx + ctx->argc;
 959 }
 960
 961 int parse_options(int argc, const char **argv,
 962                   const char *prefix,
 963                   const struct option *options,
 964                   const char * const usagestr[],
 965                   enum parse_opt_flags flags)
 966 {
 967         struct parse_opt_ctx_t ctx;
 968         struct option *real_options;
 969
 970         disallow_abbreviated_options =
 971                 git_env_bool("GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS", 0);
 972
 973         memset(&ctx, 0, sizeof(ctx));
 974         real_options = preprocess_options(&ctx, options);
 975         if (real_options)
 976                 options = real_options;
 977         parse_options_start_1(&ctx, argc, argv, prefix, options, flags);
 978         switch (parse_options_step(&ctx, options, usagestr)) {
 979         case PARSE_OPT_HELP:
 980         case PARSE_OPT_ERROR:
 981                 exit(129);
 982         case PARSE_OPT_COMPLETE:
 983                 exit(0);
 984         case PARSE_OPT_NON_OPTION:
 985         case PARSE_OPT_SUBCOMMAND:
 986                 break;
 987         case PARSE_OPT_DONE:
 988                 if (ctx.has_subcommands &&
 989                     !(flags & PARSE_OPT_SUBCOMMAND_OPTIONAL)) {
 990                         error(_("need a subcommand"));
 991                         usage_with_options(usagestr, options);
 992                 }
 993                 break;
 994         case PARSE_OPT_UNKNOWN:
 995                 if (ctx.argv[0][1] == '-') {
 996                         error(_("unknown option `%s'"), ctx.argv[0] + 2);
 997                 } else if (isascii(*ctx.opt)) {
 998                         error(_("unknown switch `%c'"), *ctx.opt);
 999                 } else {
1000                         error(_("unknown non-ascii option in string: `%s'"),
1001                               ctx.argv[0]);
1002                 }
1003                 usage_with_options(usagestr, options);
1004         }
1005
1006         precompose_argv_prefix(argc, argv, NULL);
1007         free_preprocessed_options(real_options);
1008         free(ctx.alias_groups);
1009         return parse_options_end(&ctx);
1010 }
1011
1012 static int usage_argh(const struct option *opts, FILE *outfile)
1013 {
1014         const char *s;
1015         int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
1016                 !opts->argh || !!strpbrk(opts->argh, "()<>[]|");
1017         if (opts->flags & PARSE_OPT_OPTARG)
1018                 if (opts->long_name)
1019                         s = literal ? "[=%s]" : "[=<%s>]";
1020                 else
1021                         s = literal ? "[%s]" : "[<%s>]";
1022         else
1023                 s = literal ? " %s" : " <%s>";
1024         return utf8_fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
1025 }
1026
1027 static int usage_indent(FILE *outfile)
1028 {
1029         return fprintf(outfile, "    ");
1030 }
1031
1032 #define USAGE_OPTS_WIDTH 26
1033
1034 static void usage_padding(FILE *outfile, size_t pos)
1035 {
1036         if (pos < USAGE_OPTS_WIDTH)
1037                 fprintf(outfile, "%*s", USAGE_OPTS_WIDTH - (int)pos, "");
1038         else
1039                 fprintf(outfile, "\n%*s", USAGE_OPTS_WIDTH, "");
1040 }
1041
1042 static const struct option *find_option_by_long_name(const struct option *opts,
1043                                                      const char *long_name)
1044 {
1045         for (; opts->type != OPTION_END; opts++) {
1046                 if (opts->long_name && !strcmp(opts->long_name, long_name))
1047                         return opts;
1048         }
1049         return NULL;
1050 }
1051
1052 static enum parse_opt_result usage_with_options_internal(struct parse_opt_ctx_t *ctx,
1053                                                          const char * const *usagestr,
1054                                                          const struct option *opts,
1055                                                          int full, int err)
1056 {
1057         const struct option *all_opts = opts;
1058         FILE *outfile = err ? stderr : stdout;
1059         int need_newline;
1060
1061         const char *usage_prefix = _("usage: %s");
1062         /*
1063          * The translation could be anything, but we can count on
1064          * msgfmt(1)'s --check option to have asserted that "%s" is in
1065          * the translation. So compute the length of the "usage: "
1066          * part. We are assuming that the translator wasn't overly
1067          * clever and used e.g. "%1$s" instead of "%s", there's only
1068          * one "%s" in "usage_prefix" above, so there's no reason to
1069          * do so even with a RTL language.
1070          */
1071         size_t usage_len = strlen(usage_prefix) - strlen("%s");
1072         /*
1073          * TRANSLATORS: the colon here should align with the
1074          * one in "usage: %s" translation.
1075          */
1076         const char *or_prefix = _("   or: %s");
1077         /*
1078          * TRANSLATORS: You should only need to translate this format
1079          * string if your language is a RTL language (e.g. Arabic,
1080          * Hebrew etc.), not if it's a LTR language (e.g. German,
1081          * Russian, Chinese etc.).
1082          *
1083          * When a translated usage string has an embedded "\n" it's
1084          * because options have wrapped to the next line. The line
1085          * after the "\n" will then be padded to align with the
1086          * command name, such as N_("git cmd [opt]\n<8
1087          * spaces>[opt2]"), where the 8 spaces are the same length as
1088          * "git cmd ".
1089          *
1090          * This format string prints out that already-translated
1091          * line. The "%*s" is whitespace padding to account for the
1092          * padding at the start of the line that we add in this
1093          * function. The "%s" is a line in the (hopefully already
1094          * translated) N_() usage string, which contained embedded
1095          * newlines before we split it up.
1096          */
1097         const char *usage_continued = _("%*s%s");
1098         const char *prefix = usage_prefix;
1099         int saw_empty_line = 0;
1100
1101         if (!usagestr)
1102                 return PARSE_OPT_HELP;
1103
1104         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
1105                 fprintf(outfile, "cat <<\\EOF\n");
1106
1107         while (*usagestr) {
1108                 const char *str = _(*usagestr++);
1109                 struct string_list list = STRING_LIST_INIT_DUP;
1110                 unsigned int j;
1111
1112                 if (!saw_empty_line && !*str)
1113                         saw_empty_line = 1;
1114
1115                 string_list_split(&list, str, '\n', -1);
1116                 for (j = 0; j < list.nr; j++) {
1117                         const char *line = list.items[j].string;
1118
1119                         if (saw_empty_line && *line)
1120                                 fprintf_ln(outfile, _("    %s"), line);
1121                         else if (saw_empty_line)
1122                                 fputc('\n', outfile);
1123                         else if (!j)
1124                                 fprintf_ln(outfile, prefix, line);
1125                         else
1126                                 fprintf_ln(outfile, usage_continued,
1127                                            (int)usage_len, "", line);
1128                 }
1129                 string_list_clear(&list, 0);
1130
1131                 prefix = or_prefix;
1132         }
1133
1134         need_newline = 1;
1135
1136         for (; opts->type != OPTION_END; opts++) {
1137                 size_t pos;
1138                 const char *cp, *np;
1139                 const char *positive_name = NULL;
1140
1141                 if (opts->type == OPTION_SUBCOMMAND)
1142                         continue;
1143                 if (opts->type == OPTION_GROUP) {
1144                         fputc('\n', outfile);
1145                         need_newline = 0;
1146                         if (*opts->help)
1147                                 fprintf(outfile, "%s\n", _(opts->help));
1148                         continue;
1149                 }
1150                 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
1151                         continue;
1152
1153                 if (need_newline) {
1154                         fputc('\n', outfile);
1155                         need_newline = 0;
1156                 }
1157
1158                 pos = usage_indent(outfile);
1159                 if (opts->short_name) {
1160                         if (opts->flags & PARSE_OPT_NODASH)
1161                                 pos += fprintf(outfile, "%c", opts->short_name);
1162                         else
1163                                 pos += fprintf(outfile, "-%c", opts->short_name);
1164                 }
1165                 if (opts->long_name && opts->short_name)
1166                         pos += fprintf(outfile, ", ");
1167                 if (opts->long_name) {
1168                         const char *long_name = opts->long_name;
1169                         if ((opts->flags & PARSE_OPT_NONEG) ||
1170                             skip_prefix(long_name, "no-", &positive_name))
1171                                 pos += fprintf(outfile, "--%s", long_name);
1172                         else
1173                                 pos += fprintf(outfile, "--[no-]%s", long_name);
1174                 }
1175
1176                 if (opts->type == OPTION_NUMBER)
1177                         pos += utf8_fprintf(outfile, _("-NUM"));
1178
1179                 if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
1180                     !(opts->flags & PARSE_OPT_NOARG))
1181                         pos += usage_argh(opts, outfile);
1182
1183                 if (opts->type == OPTION_ALIAS) {
1184                         usage_padding(outfile, pos);
1185                         fprintf_ln(outfile, _("alias of --%s"),
1186                                    (const char *)opts->value);
1187                         continue;
1188                 }
1189
1190                 for (cp = opts->help ? _(opts->help) : ""; *cp; cp = np) {
1191                         np = strchrnul(cp, '\n');
1192                         if (*np)
1193                                 np++;
1194                         usage_padding(outfile, pos);
1195                         fwrite(cp, 1, np - cp, outfile);
1196                         pos = 0;
1197                 }
1198                 fputc('\n', outfile);
1199
1200                 if (positive_name) {
1201                         if (find_option_by_long_name(all_opts, positive_name))
1202                                 continue;
1203                         pos = usage_indent(outfile);
1204                         pos += fprintf(outfile, "--%s", positive_name);
1205                         usage_padding(outfile, pos);
1206                         fprintf_ln(outfile, _("opposite of --no-%s"),
1207                                    positive_name);
1208                 }
1209         }
1210         fputc('\n', outfile);
1211
1212         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
1213                 fputs("EOF\n", outfile);
1214
1215         return PARSE_OPT_HELP;
1216 }
1217
1218 void NORETURN usage_with_options(const char * const *usagestr,
1219                         const struct option *opts)
1220 {
1221         usage_with_options_internal(NULL, usagestr, opts, 0, 1);
1222         exit(129);
1223 }
1224
1225 void NORETURN usage_msg_opt(const char *msg,
1226                    const char * const *usagestr,
1227                    const struct option *options)
1228 {
1229         die_message("%s\n", msg); /* The extra \n is intentional */
1230         usage_with_options(usagestr, options);
1231 }
1232
1233 void NORETURN usage_msg_optf(const char * const fmt,
1234                              const char * const *usagestr,
1235                              const struct option *options, ...)
1236 {
1237         struct strbuf msg = STRBUF_INIT;
1238         va_list ap;
1239         va_start(ap, options);
1240         strbuf_vaddf(&msg, fmt, ap);
1241         va_end(ap);
1242
1243         usage_msg_opt(msg.buf, usagestr, options);
1244 }
1245
1246 void die_for_incompatible_opt4(int opt1, const char *opt1_name,
1247                                int opt2, const char *opt2_name,
1248                                int opt3, const char *opt3_name,
1249                                int opt4, const char *opt4_name)
1250 {
1251         int count = 0;
1252         const char *options[4];
1253
1254         if (opt1)
1255                 options[count++] = opt1_name;
1256         if (opt2)
1257                 options[count++] = opt2_name;
1258         if (opt3)
1259                 options[count++] = opt3_name;
1260         if (opt4)
1261                 options[count++] = opt4_name;
1262         switch (count) {
1263         case 4:
1264                 die(_("options '%s', '%s', '%s', and '%s' cannot be used together"),
1265                     opt1_name, opt2_name, opt3_name, opt4_name);
1266                 break;
1267         case 3:
1268                 die(_("options '%s', '%s', and '%s' cannot be used together"),
1269                     options[0], options[1], options[2]);
1270                 break;
1271         case 2:
1272                 die(_("options '%s' and '%s' cannot be used together"),
1273                     options[0], options[1]);
1274                 break;
1275         default:
1276                 break;
1277         }
1278 }