Andrew's git / gitweb.git / parse-options.c
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parse-options.con commit parse-options: do not infer PARSE_OPT_NOARG from option type (c1f4ec9)
   1#include "git-compat-util.h"
   2#include "parse-options.h"
   3#include "cache.h"
   4#include "commit.h"
   5#include "color.h"
   6
   7static int parse_options_usage(struct parse_opt_ctx_t *ctx,
   8                               const char * const *usagestr,
   9                               const struct option *opts, int err);
  10
  11#define OPT_SHORT 1
  12#define OPT_UNSET 2
  13
  14static int optbug(const struct option *opt, const char *reason)
  15{
  16        if (opt->long_name)
  17                return error("BUG: option '%s' %s", opt->long_name, reason);
  18        return error("BUG: switch '%c' %s", opt->short_name, reason);
  19}
  20
  21static int opterror(const struct option *opt, const char *reason, int flags)
  22{
  23        if (flags & OPT_SHORT)
  24                return error("switch `%c' %s", opt->short_name, reason);
  25        if (flags & OPT_UNSET)
  26                return error("option `no-%s' %s", opt->long_name, reason);
  27        return error("option `%s' %s", opt->long_name, reason);
  28}
  29
  30static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
  31                   int flags, const char **arg)
  32{
  33        if (p->opt) {
  34                *arg = p->opt;
  35                p->opt = NULL;
  36        } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
  37                *arg = (const char *)opt->defval;
  38        } else if (p->argc > 1) {
  39                p->argc--;
  40                *arg = *++p->argv;
  41        } else
  42                return opterror(opt, "requires a value", flags);
  43        return 0;
  44}
  45
  46static void fix_filename(const char *prefix, const char **file)
  47{
  48        if (!file || !*file || !prefix || is_absolute_path(*file)
  49            || !strcmp("-", *file))
  50                return;
  51        *file = xstrdup(prefix_filename(prefix, strlen(prefix), *file));
  52}
  53
  54static int get_value(struct parse_opt_ctx_t *p,
  55                     const struct option *opt, int flags)
  56{
  57        const char *s, *arg;
  58        const int unset = flags & OPT_UNSET;
  59        int err;
  60
  61        if (unset && p->opt)
  62                return opterror(opt, "takes no value", flags);
  63        if (unset && (opt->flags & PARSE_OPT_NONEG))
  64                return opterror(opt, "isn't available", flags);
  65        if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
  66                return opterror(opt, "takes no value", flags);
  67
  68        switch (opt->type) {
  69        case OPTION_BIT:
  70                if (unset)
  71                        *(int *)opt->value &= ~opt->defval;
  72                else
  73                        *(int *)opt->value |= opt->defval;
  74                return 0;
  75
  76        case OPTION_NEGBIT:
  77                if (unset)
  78                        *(int *)opt->value |= opt->defval;
  79                else
  80                        *(int *)opt->value &= ~opt->defval;
  81                return 0;
  82
  83        case OPTION_BOOLEAN:
  84                *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
  85                return 0;
  86
  87        case OPTION_SET_INT:
  88                *(int *)opt->value = unset ? 0 : opt->defval;
  89                return 0;
  90
  91        case OPTION_SET_PTR:
  92                *(void **)opt->value = unset ? NULL : (void *)opt->defval;
  93                return 0;
  94
  95        case OPTION_STRING:
  96                if (unset)
  97                        *(const char **)opt->value = NULL;
  98                else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
  99                        *(const char **)opt->value = (const char *)opt->defval;
 100                else
 101                        return get_arg(p, opt, flags, (const char **)opt->value);
 102                return 0;
 103
 104        case OPTION_FILENAME:
 105                err = 0;
 106                if (unset)
 107                        *(const char **)opt->value = NULL;
 108                else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 109                        *(const char **)opt->value = (const char *)opt->defval;
 110                else
 111                        err = get_arg(p, opt, flags, (const char **)opt->value);
 112
 113                if (!err)
 114                        fix_filename(p->prefix, (const char **)opt->value);
 115                return err;
 116
 117        case OPTION_CALLBACK:
 118                if (unset)
 119                        return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 120                if (opt->flags & PARSE_OPT_NOARG)
 121                        return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 122                if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 123                        return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 124                if (get_arg(p, opt, flags, &arg))
 125                        return -1;
 126                return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 127
 128        case OPTION_INTEGER:
 129                if (unset) {
 130                        *(int *)opt->value = 0;
 131                        return 0;
 132                }
 133                if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 134                        *(int *)opt->value = opt->defval;
 135                        return 0;
 136                }
 137                if (get_arg(p, opt, flags, &arg))
 138                        return -1;
 139                *(int *)opt->value = strtol(arg, (char **)&s, 10);
 140                if (*s)
 141                        return opterror(opt, "expects a numerical value", flags);
 142                return 0;
 143
 144        default:
 145                die("should not happen, someone must be hit on the forehead");
 146        }
 147}
 148
 149static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 150{
 151        const struct option *numopt = NULL;
 152
 153        for (; options->type != OPTION_END; options++) {
 154                if (options->short_name == *p->opt) {
 155                        p->opt = p->opt[1] ? p->opt + 1 : NULL;
 156                        return get_value(p, options, OPT_SHORT);
 157                }
 158
 159                /*
 160                 * Handle the numerical option later, explicit one-digit
 161                 * options take precedence over it.
 162                 */
 163                if (options->type == OPTION_NUMBER)
 164                        numopt = options;
 165        }
 166        if (numopt && isdigit(*p->opt)) {
 167                size_t len = 1;
 168                char *arg;
 169                int rc;
 170
 171                while (isdigit(p->opt[len]))
 172                        len++;
 173                arg = xmemdupz(p->opt, len);
 174                p->opt = p->opt[len] ? p->opt + len : NULL;
 175                rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 176                free(arg);
 177                return rc;
 178        }
 179        return -2;
 180}
 181
 182static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 183                          const struct option *options)
 184{
 185        const char *arg_end = strchr(arg, '=');
 186        const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 187        int abbrev_flags = 0, ambiguous_flags = 0;
 188
 189        if (!arg_end)
 190                arg_end = arg + strlen(arg);
 191
 192        for (; options->type != OPTION_END; options++) {
 193                const char *rest;
 194                int flags = 0;
 195
 196                if (!options->long_name)
 197                        continue;
 198
 199                rest = skip_prefix(arg, options->long_name);
 200                if (options->type == OPTION_ARGUMENT) {
 201                        if (!rest)
 202                                continue;
 203                        if (*rest == '=')
 204                                return opterror(options, "takes no value", flags);
 205                        if (*rest)
 206                                continue;
 207                        p->out[p->cpidx++] = arg - 2;
 208                        return 0;
 209                }
 210                if (!rest) {
 211                        /* abbreviated? */
 212                        if (!strncmp(options->long_name, arg, arg_end - arg)) {
 213is_abbreviated:
 214                                if (abbrev_option) {
 215                                        /*
 216                                         * If this is abbreviated, it is
 217                                         * ambiguous. So when there is no
 218                                         * exact match later, we need to
 219                                         * error out.
 220                                         */
 221                                        ambiguous_option = abbrev_option;
 222                                        ambiguous_flags = abbrev_flags;
 223                                }
 224                                if (!(flags & OPT_UNSET) && *arg_end)
 225                                        p->opt = arg_end + 1;
 226                                abbrev_option = options;
 227                                abbrev_flags = flags;
 228                                continue;
 229                        }
 230                        /* negation allowed? */
 231                        if (options->flags & PARSE_OPT_NONEG)
 232                                continue;
 233                        /* negated and abbreviated very much? */
 234                        if (!prefixcmp("no-", arg)) {
 235                                flags |= OPT_UNSET;
 236                                goto is_abbreviated;
 237                        }
 238                        /* negated? */
 239                        if (strncmp(arg, "no-", 3))
 240                                continue;
 241                        flags |= OPT_UNSET;
 242                        rest = skip_prefix(arg + 3, options->long_name);
 243                        /* abbreviated and negated? */
 244                        if (!rest && !prefixcmp(options->long_name, arg + 3))
 245                                goto is_abbreviated;
 246                        if (!rest)
 247                                continue;
 248                }
 249                if (*rest) {
 250                        if (*rest != '=')
 251                                continue;
 252                        p->opt = rest + 1;
 253                }
 254                return get_value(p, options, flags);
 255        }
 256
 257        if (ambiguous_option)
 258                return error("Ambiguous option: %s "
 259                        "(could be --%s%s or --%s%s)",
 260                        arg,
 261                        (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 262                        ambiguous_option->long_name,
 263                        (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 264                        abbrev_option->long_name);
 265        if (abbrev_option)
 266                return get_value(p, abbrev_option, abbrev_flags);
 267        return -2;
 268}
 269
 270static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 271                            const struct option *options)
 272{
 273        for (; options->type != OPTION_END; options++) {
 274                if (!(options->flags & PARSE_OPT_NODASH))
 275                        continue;
 276                if (options->short_name == arg[0] && arg[1] == '\0')
 277                        return get_value(p, options, OPT_SHORT);
 278        }
 279        return -2;
 280}
 281
 282static void check_typos(const char *arg, const struct option *options)
 283{
 284        if (strlen(arg) < 3)
 285                return;
 286
 287        if (!prefixcmp(arg, "no-")) {
 288                error ("did you mean `--%s` (with two dashes ?)", arg);
 289                exit(129);
 290        }
 291
 292        for (; options->type != OPTION_END; options++) {
 293                if (!options->long_name)
 294                        continue;
 295                if (!prefixcmp(options->long_name, arg)) {
 296                        error ("did you mean `--%s` (with two dashes ?)", arg);
 297                        exit(129);
 298                }
 299        }
 300}
 301
 302static void parse_options_check(const struct option *opts)
 303{
 304        int err = 0;
 305
 306        for (; opts->type != OPTION_END; opts++) {
 307                if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 308                    (opts->flags & PARSE_OPT_OPTARG))
 309                        err |= optbug(opts, "uses incompatible flags "
 310                                        "LASTARG_DEFAULT and OPTARG");
 311                if (opts->flags & PARSE_OPT_NODASH &&
 312                    ((opts->flags & PARSE_OPT_OPTARG) ||
 313                     !(opts->flags & PARSE_OPT_NOARG) ||
 314                     !(opts->flags & PARSE_OPT_NONEG) ||
 315                     opts->long_name))
 316                        err |= optbug(opts, "uses feature "
 317                                        "not supported for dashless options");
 318                switch (opts->type) {
 319                case OPTION_BOOLEAN:
 320                case OPTION_BIT:
 321                case OPTION_NEGBIT:
 322                case OPTION_SET_INT:
 323                case OPTION_SET_PTR:
 324                case OPTION_NUMBER:
 325                        if ((opts->flags & PARSE_OPT_OPTARG) ||
 326                            !(opts->flags & PARSE_OPT_NOARG))
 327                                err |= optbug(opts, "should not accept an argument");
 328                default:
 329                        ; /* ok. (usually accepts an argument) */
 330                }
 331        }
 332        if (err)
 333                exit(128);
 334}
 335
 336void parse_options_start(struct parse_opt_ctx_t *ctx,
 337                         int argc, const char **argv, const char *prefix,
 338                         const struct option *options, int flags)
 339{
 340        memset(ctx, 0, sizeof(*ctx));
 341        ctx->argc = argc - 1;
 342        ctx->argv = argv + 1;
 343        ctx->out  = argv;
 344        ctx->prefix = prefix;
 345        ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 346        ctx->flags = flags;
 347        if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 348            (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 349                die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 350        parse_options_check(options);
 351}
 352
 353static int usage_with_options_internal(struct parse_opt_ctx_t *,
 354                                       const char * const *,
 355                                       const struct option *, int, int);
 356
 357int parse_options_step(struct parse_opt_ctx_t *ctx,
 358                       const struct option *options,
 359                       const char * const usagestr[])
 360{
 361        int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 362
 363        /* we must reset ->opt, unknown short option leave it dangling */
 364        ctx->opt = NULL;
 365
 366        for (; ctx->argc; ctx->argc--, ctx->argv++) {
 367                const char *arg = ctx->argv[0];
 368
 369                if (*arg != '-' || !arg[1]) {
 370                        if (parse_nodash_opt(ctx, arg, options) == 0)
 371                                continue;
 372                        if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 373                                break;
 374                        ctx->out[ctx->cpidx++] = ctx->argv[0];
 375                        continue;
 376                }
 377
 378                if (arg[1] != '-') {
 379                        ctx->opt = arg + 1;
 380                        if (internal_help && *ctx->opt == 'h')
 381                                return parse_options_usage(ctx, usagestr, options, 0);
 382                        switch (parse_short_opt(ctx, options)) {
 383                        case -1:
 384                                return parse_options_usage(ctx, usagestr, options, 1);
 385                        case -2:
 386                                goto unknown;
 387                        }
 388                        if (ctx->opt)
 389                                check_typos(arg + 1, options);
 390                        while (ctx->opt) {
 391                                if (internal_help && *ctx->opt == 'h')
 392                                        return parse_options_usage(ctx, usagestr, options, 0);
 393                                switch (parse_short_opt(ctx, options)) {
 394                                case -1:
 395                                        return parse_options_usage(ctx, usagestr, options, 1);
 396                                case -2:
 397                                        /* fake a short option thing to hide the fact that we may have
 398                                         * started to parse aggregated stuff
 399                                         *
 400                                         * This is leaky, too bad.
 401                                         */
 402                                        ctx->argv[0] = xstrdup(ctx->opt - 1);
 403                                        *(char *)ctx->argv[0] = '-';
 404                                        goto unknown;
 405                                }
 406                        }
 407                        continue;
 408                }
 409
 410                if (!arg[2]) { /* "--" */
 411                        if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 412                                ctx->argc--;
 413                                ctx->argv++;
 414                        }
 415                        break;
 416                }
 417
 418                if (internal_help && !strcmp(arg + 2, "help-all"))
 419                        return usage_with_options_internal(ctx, usagestr, options, 1, 0);
 420                if (internal_help && !strcmp(arg + 2, "help"))
 421                        return parse_options_usage(ctx, usagestr, options, 0);
 422                switch (parse_long_opt(ctx, arg + 2, options)) {
 423                case -1:
 424                        return parse_options_usage(ctx, usagestr, options, 1);
 425                case -2:
 426                        goto unknown;
 427                }
 428                continue;
 429unknown:
 430                if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 431                        return PARSE_OPT_UNKNOWN;
 432                ctx->out[ctx->cpidx++] = ctx->argv[0];
 433                ctx->opt = NULL;
 434        }
 435        return PARSE_OPT_DONE;
 436}
 437
 438int parse_options_end(struct parse_opt_ctx_t *ctx)
 439{
 440        memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 441        ctx->out[ctx->cpidx + ctx->argc] = NULL;
 442        return ctx->cpidx + ctx->argc;
 443}
 444
 445int parse_options(int argc, const char **argv, const char *prefix,
 446                  const struct option *options, const char * const usagestr[],
 447                  int flags)
 448{
 449        struct parse_opt_ctx_t ctx;
 450
 451        parse_options_start(&ctx, argc, argv, prefix, options, flags);
 452        switch (parse_options_step(&ctx, options, usagestr)) {
 453        case PARSE_OPT_HELP:
 454                exit(129);
 455        case PARSE_OPT_DONE:
 456                break;
 457        default: /* PARSE_OPT_UNKNOWN */
 458                if (ctx.argv[0][1] == '-') {
 459                        error("unknown option `%s'", ctx.argv[0] + 2);
 460                } else {
 461                        error("unknown switch `%c'", *ctx.opt);
 462                }
 463                usage_with_options(usagestr, options);
 464        }
 465
 466        return parse_options_end(&ctx);
 467}
 468
 469static int usage_argh(const struct option *opts, FILE *outfile)
 470{
 471        const char *s;
 472        int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
 473        if (opts->flags & PARSE_OPT_OPTARG)
 474                if (opts->long_name)
 475                        s = literal ? "[=%s]" : "[=<%s>]";
 476                else
 477                        s = literal ? "[%s]" : "[<%s>]";
 478        else
 479                s = literal ? " %s" : " <%s>";
 480        return fprintf(outfile, s, opts->argh ? opts->argh : "...");
 481}
 482
 483#define USAGE_OPTS_WIDTH 24
 484#define USAGE_GAP         2
 485
 486static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
 487                                       const char * const *usagestr,
 488                                       const struct option *opts, int full, int err)
 489{
 490        FILE *outfile = err ? stderr : stdout;
 491
 492        if (!usagestr)
 493                return PARSE_OPT_HELP;
 494
 495        if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 496                fprintf(outfile, "cat <<\\EOF\n");
 497
 498        fprintf(outfile, "usage: %s\n", *usagestr++);
 499        while (*usagestr && **usagestr)
 500                fprintf(outfile, "   or: %s\n", *usagestr++);
 501        while (*usagestr) {
 502                fprintf(outfile, "%s%s\n",
 503                                **usagestr ? "    " : "",
 504                                *usagestr);
 505                usagestr++;
 506        }
 507
 508        if (opts->type != OPTION_GROUP)
 509                fputc('\n', outfile);
 510
 511        for (; opts->type != OPTION_END; opts++) {
 512                size_t pos;
 513                int pad;
 514
 515                if (opts->type == OPTION_GROUP) {
 516                        fputc('\n', outfile);
 517                        if (*opts->help)
 518                                fprintf(outfile, "%s\n", opts->help);
 519                        continue;
 520                }
 521                if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 522                        continue;
 523
 524                pos = fprintf(outfile, "    ");
 525                if (opts->short_name && !(opts->flags & PARSE_OPT_NEGHELP)) {
 526                        if (opts->flags & PARSE_OPT_NODASH)
 527                                pos += fprintf(outfile, "%c", opts->short_name);
 528                        else
 529                                pos += fprintf(outfile, "-%c", opts->short_name);
 530                }
 531                if (opts->long_name && opts->short_name)
 532                        pos += fprintf(outfile, ", ");
 533                if (opts->long_name)
 534                        pos += fprintf(outfile, "--%s%s",
 535                                (opts->flags & PARSE_OPT_NEGHELP) ?  "no-" : "",
 536                                opts->long_name);
 537                if (opts->type == OPTION_NUMBER)
 538                        pos += fprintf(outfile, "-NUM");
 539
 540                if (!(opts->flags & PARSE_OPT_NOARG))
 541                        pos += usage_argh(opts, outfile);
 542
 543                if (pos <= USAGE_OPTS_WIDTH)
 544                        pad = USAGE_OPTS_WIDTH - pos;
 545                else {
 546                        fputc('\n', outfile);
 547                        pad = USAGE_OPTS_WIDTH;
 548                }
 549                fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
 550        }
 551        fputc('\n', outfile);
 552
 553        if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 554                fputs("EOF\n", outfile);
 555
 556        return PARSE_OPT_HELP;
 557}
 558
 559void usage_with_options(const char * const *usagestr,
 560                        const struct option *opts)
 561{
 562        usage_with_options_internal(NULL, usagestr, opts, 0, 1);
 563        exit(129);
 564}
 565
 566void usage_msg_opt(const char *msg,
 567                   const char * const *usagestr,
 568                   const struct option *options)
 569{
 570        fprintf(stderr, "%s\n\n", msg);
 571        usage_with_options(usagestr, options);
 572}
 573
 574static int parse_options_usage(struct parse_opt_ctx_t *ctx,
 575                               const char * const *usagestr,
 576                               const struct option *opts, int err)
 577{
 578        return usage_with_options_internal(ctx, usagestr, opts, 0, err);
 579}
 580
 581
 582/*----- some often used options -----*/
 583#include "cache.h"
 584
 585int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
 586{
 587        int v;
 588
 589        if (!arg) {
 590                v = unset ? 0 : DEFAULT_ABBREV;
 591        } else {
 592                v = strtol(arg, (char **)&arg, 10);
 593                if (*arg)
 594                        return opterror(opt, "expects a numerical value", 0);
 595                if (v && v < MINIMUM_ABBREV)
 596                        v = MINIMUM_ABBREV;
 597                else if (v > 40)
 598                        v = 40;
 599        }
 600        *(int *)(opt->value) = v;
 601        return 0;
 602}
 603
 604int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
 605                             int unset)
 606{
 607        *(unsigned long *)(opt->value) = approxidate(arg);
 608        return 0;
 609}
 610
 611int parse_opt_color_flag_cb(const struct option *opt, const char *arg,
 612                            int unset)
 613{
 614        int value;
 615
 616        if (!arg)
 617                arg = unset ? "never" : (const char *)opt->defval;
 618        value = git_config_colorbool(NULL, arg, -1);
 619        if (value < 0)
 620                return opterror(opt,
 621                        "expects \"always\", \"auto\", or \"never\"", 0);
 622        *(int *)opt->value = value;
 623        return 0;
 624}
 625
 626int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
 627                           int unset)
 628{
 629        int *target = opt->value;
 630
 631        if (unset)
 632                /* --no-quiet, --no-verbose */
 633                *target = 0;
 634        else if (opt->short_name == 'v') {
 635                if (*target >= 0)
 636                        (*target)++;
 637                else
 638                        *target = 1;
 639        } else {
 640                if (*target <= 0)
 641                        (*target)--;
 642                else
 643                        *target = -1;
 644        }
 645        return 0;
 646}
 647
 648int parse_opt_with_commit(const struct option *opt, const char *arg, int unset)
 649{
 650        unsigned char sha1[20];
 651        struct commit *commit;
 652
 653        if (!arg)
 654                return -1;
 655        if (get_sha1(arg, sha1))
 656                return error("malformed object name %s", arg);
 657        commit = lookup_commit_reference(sha1);
 658        if (!commit)
 659                return error("no such commit %s", arg);
 660        commit_list_insert(commit, opt->value);
 661        return 0;
 662}
 663
 664int parse_opt_tertiary(const struct option *opt, const char *arg, int unset)
 665{
 666        int *target = opt->value;
 667        *target = unset ? 2 : 1;
 668        return 0;
 669}
 670
 671int parse_options_concat(struct option *dst, size_t dst_size, struct option *src)
 672{
 673        int i, j;
 674
 675        for (i = 0; i < dst_size; i++)
 676                if (dst[i].type == OPTION_END)
 677                        break;
 678        for (j = 0; i < dst_size; i++, j++) {
 679                dst[i] = src[j];
 680                if (src[j].type == OPTION_END)
 681                        return 0;
 682        }
 683        return -1;
 684}