src/getargs.c

   1 /* Parse command line arguments for Bison.
   2
   3    Copyright (C) 1984, 1986, 1989, 1992, 2000-2012 Free Software
   4    Foundation, Inc.
   5
   6    This file is part of Bison, the GNU Compiler Compiler.
   7
   8    This program is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include <config.h>
  22 #include "system.h"
  23 #include "output.h"
  24
  25 #include <argmatch.h>
  26 #include <c-strcase.h>
  27 #include <configmake.h>
  28 #include <error.h>
  29
  30 /* Hack to get <getopt.h> to declare getopt with a prototype.  */
  31 #if lint && ! defined __GNU_LIBRARY__
  32 # define __GNU_LIBRARY__
  33 # define HACK_FOR___GNU_LIBRARY___PROTOTYPE 1
  34 #endif
  35
  36 #include <getopt.h>
  37
  38 #ifdef HACK_FOR___GNU_LIBRARY___PROTOTYPE
  39 # undef __GNU_LIBRARY__
  40 # undef HACK_FOR___GNU_LIBRARY___PROTOTYPE
  41 #endif
  42
  43 #include <progname.h>
  44
  45 #include "complain.h"
  46 #include "files.h"
  47 #include "getargs.h"
  48 #include "muscle-tab.h"
  49 #include "quote.h"
  50 #include "uniqstr.h"
  51
  52 bool debug;
  53 bool defines_flag;
  54 bool graph_flag;
  55 bool xml_flag;
  56 bool locations_flag;
  57 bool no_lines_flag;
  58 bool token_table_flag;
  59 bool yacc_flag; /* for -y */
  60
  61 bool error_verbose = false;
  62
  63 bool nondeterministic_parser = false;
  64 bool glr_parser = false;
  65
  66 int feature_flag = feature_none;
  67 int report_flag = report_none;
  68 int trace_flag = trace_none;
  69 int warnings_flag = warnings_conflicts_sr | warnings_conflicts_rr
  70                     | warnings_other;
  71
  72 static struct bison_language const valid_languages[] = {
  73   { "c", "c-skel.m4", ".c", ".h", true },
  74   { "c++", "c++-skel.m4", ".cc", ".hh", true },
  75   { "java", "java-skel.m4", ".java", ".java", false },
  76   { "", "", "", "", false }
  77 };
  78
  79 int skeleton_prio = default_prio;
  80 const char *skeleton = NULL;
  81 int language_prio = default_prio;
  82 struct bison_language const *language = &valid_languages[0];
  83 const char *include = NULL;
  84
  85
  86 /** Decode an option's set of keys.
  87  *
  88  *  \param option   option being decoded.
  89  *  \param keys     array of valid subarguments.
  90  *  \param values   array of corresponding (int) values.
  91  *  \param all      the all value.
  92  *  \param flags    the flags to update
  93  *  \param args     comma separated list of effective subarguments to decode.
  94  *                  If 0, then activate all the flags.
  95  *
  96  *  If VALUE != 0 then KEY sets flags and no-KEY clears them.
  97  *  If VALUE == 0 then KEY clears all flags from \c all and no-KEY sets all
  98  *  flags from \c all.  Thus no-none = all and no-all = none.
  99  */
 100 static void
 101 flags_argmatch (const char *option,
 102                 const char * const keys[], const int values[],
 103                 int all, int *flags, char *args)
 104 {
 105   if (args)
 106     {
 107       args = strtok (args, ",");
 108       while (args)
 109         {
 110           int no = strncmp (args, "no-", 3) == 0 ? 3 : 0;
 111           int value = XARGMATCH (option, args + no, keys, values);
 112           if (value == 0)
 113             {
 114               if (no)
 115                 *flags |= all;
 116               else
 117                 *flags &= ~all;
 118             }
 119           else
 120             {
 121               if (no)
 122                 *flags &= ~value;
 123               else
 124                 *flags |= value;
 125             }
 126           args = strtok (NULL, ",");
 127         }
 128     }
 129   else
 130     *flags |= all;
 131 }
 132
 133 /** Decode a set of sub arguments.
 134  *
 135  *  \param FlagName  the flag familly to update.
 136  *  \param Args      the effective sub arguments to decode.
 137  *
 138  *  \arg FlagName_args   the list of keys.
 139  *  \arg FlagName_types  the list of values.
 140  *  \arg FlagName_all    the all value.
 141  *  \arg FlagName_flag   the flag to update.
 142  */
 143 #define FLAGS_ARGMATCH(FlagName, Args)                                  \
 144   flags_argmatch ("--" #FlagName, FlagName ## _args, FlagName ## _types, \
 145                   FlagName ## _all, &FlagName ## _flag, Args)
 146
 147
 148 /*----------------------.
 149 | --report's handling.  |
 150 `----------------------*/
 151
 152 static const char * const report_args[] =
 153 {
 154   /* In a series of synonyms, present the most meaningful first, so
 155      that argmatch_valid be more readable.  */
 156   "none",
 157   "state", "states",
 158   "itemset", "itemsets",
 159   "lookahead", "lookaheads", "look-ahead",
 160   "solved",
 161   "all",
 162   0
 163 };
 164
 165 static const int report_types[] =
 166 {
 167   report_none,
 168   report_states, report_states,
 169   report_states | report_itemsets, report_states | report_itemsets,
 170   report_states | report_lookahead_tokens,
 171   report_states | report_lookahead_tokens,
 172   report_states | report_lookahead_tokens,
 173   report_states | report_solved_conflicts,
 174   report_all
 175 };
 176
 177 ARGMATCH_VERIFY (report_args, report_types);
 178
 179
 180 /*---------------------.
 181 | --trace's handling.  |
 182 `---------------------*/
 183
 184 static const char * const trace_args[] =
 185 {
 186   /* In a series of synonyms, present the most meaningful first, so
 187      that argmatch_valid be more readable.  */
 188   "none       - no traces",
 189   "scan       - grammar scanner traces",
 190   "parse      - grammar parser traces",
 191   "automaton  - construction of the automaton",
 192   "bitsets    - use of bitsets",
 193   "grammar    - reading, reducing the grammar",
 194   "resource   - memory consumption (where available)",
 195   "sets       - grammar sets: firsts, nullable etc.",
 196   "muscles    - m4 definitions passed to the skeleton",
 197   "tools      - m4 invocation",
 198   "m4         - m4 traces",
 199   "skeleton   - skeleton postprocessing",
 200   "time       - time consumption",
 201   "ielr       - IELR conversion",
 202   "all        - all of the above",
 203   0
 204 };
 205
 206 static const int trace_types[] =
 207 {
 208   trace_none,
 209   trace_scan,
 210   trace_parse,
 211   trace_automaton,
 212   trace_bitsets,
 213   trace_grammar,
 214   trace_resource,
 215   trace_sets,
 216   trace_muscles,
 217   trace_tools,
 218   trace_m4,
 219   trace_skeleton,
 220   trace_time,
 221   trace_ielr,
 222   trace_all
 223 };
 224
 225 ARGMATCH_VERIFY (trace_args, trace_types);
 226
 227
 228 /*------------------------.
 229 | --warnings's handling.  |
 230 `------------------------*/
 231
 232 static const char * const warnings_args[] =
 233 {
 234   /* In a series of synonyms, present the most meaningful first, so
 235      that argmatch_valid be more readable.  */
 236   "none            - no warnings",
 237   "midrule-values  - unset or unused midrule values",
 238   "yacc            - incompatibilities with POSIX Yacc",
 239   "conflicts-sr    - S/R conflicts",
 240   "conflicts-rr    - R/R conflicts",
 241   "other           - all other warnings",
 242   "all             - all of the above",
 243   "error           - warnings are errors",
 244   0
 245 };
 246
 247 static const int warnings_types[] =
 248 {
 249   warnings_none,
 250   warnings_midrule_values,
 251   warnings_yacc,
 252   warnings_conflicts_sr,
 253   warnings_conflicts_rr,
 254   warnings_other,
 255   warnings_all,
 256   warnings_error
 257 };
 258
 259 ARGMATCH_VERIFY (warnings_args, warnings_types);
 260
 261 /*-----------------------.
 262 | --feature's handling.  |
 263 `-----------------------*/
 264
 265 static const char * const feature_args[] =
 266 {
 267   "none",
 268   "caret", "diagnostics-show-caret",
 269   "all",
 270   0
 271 };
 272
 273 static const int feature_types[] =
 274 {
 275   feature_none,
 276   feature_caret, feature_caret,
 277   feature_all
 278 };
 279
 280 ARGMATCH_VERIFY (feature_args, feature_types);
 281
 282 /*-------------------------------------------.
 283 | Display the help message and exit STATUS.  |
 284 `-------------------------------------------*/
 285
 286 static void usage (int) ATTRIBUTE_NORETURN;
 287
 288 static void
 289 usage (int status)
 290 {
 291   if (status != 0)
 292     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 293              program_name);
 294   else
 295     {
 296       /* For ../build-aux/cross-options.pl to work, use the format:
 297                 ^  -S, --long[=ARGS] (whitespace)
 298          A --long option is required.
 299          Otherwise, add exceptions to ../build-aux/cross-options.pl.  */
 300
 301       printf (_("Usage: %s [OPTION]... FILE\n"), program_name);
 302       fputs (_("\
 303 Generate a deterministic LR or generalized LR (GLR) parser employing\n\
 304 LALR(1), IELR(1), or canonical LR(1) parser tables.  IELR(1) and\n\
 305 canonical LR(1) support is experimental.\n\
 306 \n\
 307 "), stdout);
 308
 309       fputs (_("\
 310 Mandatory arguments to long options are mandatory for short options too.\n\
 311 "), stdout);
 312       fputs (_("\
 313 The same is true for optional arguments.\n\
 314 "), stdout);
 315
 316       fputs (_("\
 317 \n\
 318 Operation modes:\n\
 319   -h, --help                 display this help and exit\n\
 320   -V, --version              output version information and exit\n\
 321       --print-localedir      output directory containing locale-dependent data\n\
 322       --print-datadir        output directory containing skeletons and XSLT\n\
 323   -y, --yacc                 emulate POSIX Yacc\n\
 324   -W, --warnings[=CATEGORY]  report the warnings falling in CATEGORY\n\
 325   -f, --feature[=FEATURE]    activate miscellaneous features\n\
 326 \n\
 327 "), stdout);
 328
 329       fputs (_("\
 330 Parser:\n\
 331   -L, --language=LANGUAGE          specify the output programming language\n\
 332   -S, --skeleton=FILE              specify the skeleton to use\n\
 333   -t, --debug                      instrument the parser for debugging\n\
 334       --locations                  enable location support\n\
 335   -D, --define=NAME[=VALUE]        similar to '%define NAME \"VALUE\"'\n\
 336   -F, --force-define=NAME[=VALUE]  override '%define NAME \"VALUE\"'\n\
 337   -p, --name-prefix=PREFIX         prepend PREFIX to the external symbols\n\
 338                                    deprecated by '-Dapi.prefix=PREFIX'\n\
 339   -l, --no-lines                   don't generate '#line' directives\n\
 340   -k, --token-table                include a table of token names\n\
 341 "), stdout);
 342       putc ('\n', stdout);
 343
 344       /* Keep -d and --defines separate so that ../build-aux/cross-options.pl
 345        * won't assume that -d also takes an argument.  */
 346       fputs (_("\
 347 Output:\n\
 348       --defines[=FILE]       also produce a header file\n\
 349   -d                         likewise but cannot specify FILE (for POSIX Yacc)\n\
 350   -r, --report=THINGS        also produce details on the automaton\n\
 351       --report-file=FILE     write report to FILE\n\
 352   -v, --verbose              same as `--report=state'\n\
 353   -b, --file-prefix=PREFIX   specify a PREFIX for output files\n\
 354   -o, --output=FILE          leave output to FILE\n\
 355   -g, --graph[=FILE]         also output a graph of the automaton\n\
 356   -x, --xml[=FILE]           also output an XML report of the automaton\n\
 357                              (the XML schema is experimental)\n\
 358 "), stdout);
 359       putc ('\n', stdout);
 360
 361       fputs (_("\
 362 Warning categories include:\n\
 363   `midrule-values'  unset or unused midrule values\n\
 364   `yacc'            incompatibilities with POSIX Yacc\n\
 365   `conflicts-sr'    S/R conflicts (enabled by default)\n\
 366   `conflicts-rr'    R/R conflicts (enabled by default)\n\
 367   `deprecated'      obsolete constructs\n\
 368   `other'           all other warnings (enabled by default)\n\
 369   `all'             all the warnings\n\
 370   `no-CATEGORY'     turn off warnings in CATEGORY\n\
 371   `none'            turn off all the warnings\n\
 372   `error'           treat warnings as errors\n\
 373 "), stdout);
 374       putc ('\n', stdout);
 375
 376       fputs (_("\
 377 THINGS is a list of comma separated words that can include:\n\
 378   `state'        describe the states\n\
 379   `itemset'      complete the core item sets with their closure\n\
 380   `lookahead'    explicitly associate lookahead tokens to items\n\
 381   `solved'       describe shift/reduce conflicts solving\n\
 382   `all'          include all the above information\n\
 383   `none'         disable the report\n\
 384 "), stdout);
 385       putc ('\n', stdout);
 386
 387       fputs (_("\
 388 FEATURE is a list of comma separated words that can include:\n\
 389   `caret'        show errors with carets\n\
 390   `all'          all of the above\n\
 391   `none'         disable all of the above\n\
 392   "), stdout);
 393
 394       putc ('\n', stdout);
 395       printf (_("Report bugs to <%s>.\n"), PACKAGE_BUGREPORT);
 396       printf (_("%s home page: <%s>.\n"), PACKAGE_NAME, PACKAGE_URL);
 397       fputs (_("General help using GNU software: "
 398                "<http://www.gnu.org/gethelp/>.\n"),
 399              stdout);
 400       /* Don't output this redundant message for English locales.
 401          Note we still output for 'C' so that it gets included in the
 402          man page.  */
 403       const char *lc_messages = setlocale (LC_MESSAGES, NULL);
 404       if (lc_messages && strcmp (lc_messages, "en_"))
 405         /* TRANSLATORS: Replace LANG_CODE in this URL with your language
 406            code <http://translationproject.org/team/LANG_CODE.html> to
 407            form one of the URLs at http://translationproject.org/team/.
 408            Otherwise, replace the entire URL with your translation team's
 409            email address.  */
 410         fputs (_("Report translation bugs to "
 411                  "<http://translationproject.org/team/>.\n"), stdout);
 412       fputs (_("For complete documentation, run: info bison.\n"), stdout);
 413     }
 414
 415   exit (status);
 416 }
 417
 418
 419 /*------------------------------.
 420 | Display the version message.  |
 421 `------------------------------*/
 422
 423 static void
 424 version (void)
 425 {
 426   /* Some efforts were made to ease the translators' task, please
 427      continue.  */
 428   printf (_("bison (GNU Bison) %s"), VERSION);
 429   putc ('\n', stdout);
 430   fputs (_("Written by Robert Corbett and Richard Stallman.\n"), stdout);
 431   putc ('\n', stdout);
 432
 433   fprintf (stdout,
 434            _("Copyright (C) %d Free Software Foundation, Inc.\n"),
 435            PACKAGE_COPYRIGHT_YEAR);
 436
 437   fputs (_("\
 438 This is free software; see the source for copying conditions.  There is NO\n\
 439 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
 440 "),
 441          stdout);
 442 }
 443
 444
 445 /*-------------------------------------.
 446 | --skeleton and --language handling.  |
 447 `--------------------------------------*/
 448
 449 void
 450 skeleton_arg (char const *arg, int prio, location loc)
 451 {
 452   if (prio < skeleton_prio)
 453     {
 454       skeleton_prio = prio;
 455       skeleton = arg;
 456     }
 457   else if (prio == skeleton_prio)
 458     complain_at (loc, _("multiple skeleton declarations are invalid"));
 459 }
 460
 461 void
 462 language_argmatch (char const *arg, int prio, location loc)
 463 {
 464   char const *msg;
 465
 466   if (prio < language_prio)
 467     {
 468       int i;
 469       for (i = 0; valid_languages[i].language[0]; i++)
 470         if (c_strcasecmp (arg, valid_languages[i].language) == 0)
 471           {
 472             language_prio = prio;
 473             language = &valid_languages[i];
 474             return;
 475           }
 476       msg = _("%s: invalid language");
 477     }
 478   else if (language_prio == prio)
 479     msg = _("multiple language declarations are invalid");
 480   else
 481     return;
 482
 483   complain_at (loc, msg, quotearg_colon (arg));
 484 }
 485
 486 /*----------------------.
 487 | Process the options.  |
 488 `----------------------*/
 489
 490 /* Shorts options.
 491    Should be computed from long_options.  */
 492 static char const short_options[] =
 493   "D:"
 494   "F:"
 495   "L:"
 496   "S:"
 497   "T::"
 498   "V"
 499   "W::"
 500   "b:"
 501   "d"
 502   "f::"
 503   "e"
 504   "g::"
 505   "h"
 506   "k"
 507   "l"
 508   "n"
 509   "o:"
 510   "p:"
 511   "r:"
 512   "t"
 513   "v"
 514   "x::"
 515   "y"
 516   ;
 517
 518 /* Values for long options that do not have single-letter equivalents.  */
 519 enum
 520 {
 521   LOCATIONS_OPTION = CHAR_MAX + 1,
 522   PRINT_LOCALEDIR_OPTION,
 523   PRINT_DATADIR_OPTION,
 524   REPORT_FILE_OPTION
 525 };
 526
 527 static struct option const long_options[] =
 528 {
 529   /* Operation modes. */
 530   { "help",            no_argument,       0,   'h' },
 531   { "version",         no_argument,       0,   'V' },
 532   { "print-localedir", no_argument,       0,   PRINT_LOCALEDIR_OPTION },
 533   { "print-datadir",   no_argument,       0,   PRINT_DATADIR_OPTION   },
 534   { "warnings",        optional_argument, 0,   'W' },
 535
 536   /* Parser. */
 537   { "name-prefix",   required_argument,   0,   'p' },
 538   { "include",       required_argument,   0,   'I' },
 539
 540   /* Output. */
 541   { "file-prefix", required_argument,   0,   'b' },
 542   { "output",      required_argument,   0,   'o' },
 543   { "output-file", required_argument,   0,   'o' },
 544   { "graph",       optional_argument,   0,   'g' },
 545   { "xml",         optional_argument,   0,   'x' },
 546   { "report",      required_argument,   0,   'r' },
 547   { "report-file", required_argument,   0,   REPORT_FILE_OPTION },
 548   { "verbose",     no_argument,         0,   'v' },
 549
 550   /* Hidden. */
 551   { "trace",         optional_argument,   0,     'T' },
 552
 553   /* Output.  */
 554   { "defines",     optional_argument,   0,   'd' },
 555   { "flag",        optional_argument,   0,   'f' },
 556
 557   /* Operation modes.  */
 558   { "fixed-output-files", no_argument,  0,   'y' },
 559   { "yacc",               no_argument,  0,   'y' },
 560
 561   /* Parser.  */
 562   { "debug",          no_argument,               0,   't' },
 563   { "define",         required_argument,         0,   'D' },
 564   { "force-define",   required_argument,         0,   'F' },
 565   { "locations",      no_argument,               0, LOCATIONS_OPTION },
 566   { "no-lines",       no_argument,               0,   'l' },
 567   { "raw",            no_argument,               0,     0 },
 568   { "skeleton",       required_argument,         0,   'S' },
 569   { "language",       required_argument,         0,   'L' },
 570   { "token-table",    no_argument,               0,   'k' },
 571
 572   {0, 0, 0, 0}
 573 };
 574
 575 /* Under DOS, there is no difference on the case.  This can be
 576    troublesome when looking for `.tab' etc.  */
 577 #ifdef MSDOS
 578 # define AS_FILE_NAME(File) (strlwr (File), (File))
 579 #else
 580 # define AS_FILE_NAME(File) (File)
 581 #endif
 582
 583 /* Build a location for the current command line argument. */
 584 static
 585 location
 586 command_line_location (void)
 587 {
 588   location res;
 589   /* "<command line>" is used in GCC's messages about -D. */
 590   boundary_set (&res.start, uniqstr_new ("<command line>"), optind - 1, -1);
 591   res.end = res.start;
 592   return res;
 593 }
 594
 595
 596 void
 597 getargs (int argc, char *argv[])
 598 {
 599   int c;
 600
 601   while ((c = getopt_long (argc, argv, short_options, long_options, NULL))
 602          != -1)
 603     switch (c)
 604       {
 605         /* ASCII Sorting for short options (i.e., upper case then
 606            lower case), and then long-only options.  */
 607
 608       case 0:
 609         /* Certain long options cause getopt_long to return 0.  */
 610         break;
 611
 612       case 'D': /* -DNAME[=VALUE]. */
 613       case 'F': /* -FNAME[=VALUE]. */
 614         {
 615           char* name = optarg;
 616           char* value = mbschr (optarg, '=');
 617           if (value)
 618             *value++ = 0;
 619           muscle_percent_define_insert (name, command_line_location (),
 620                                         value ? value : "",
 621                                         c == 'D' ? MUSCLE_PERCENT_DEFINE_D
 622                                                  : MUSCLE_PERCENT_DEFINE_F);
 623         }
 624         break;
 625
 626       case 'I':
 627         include = AS_FILE_NAME (optarg);
 628         break;
 629
 630       case 'L':
 631         language_argmatch (optarg, command_line_prio,
 632                            command_line_location ());
 633         break;
 634
 635       case 'S':
 636         skeleton_arg (AS_FILE_NAME (optarg), command_line_prio,
 637                       command_line_location ());
 638         break;
 639
 640       case 'T':
 641         FLAGS_ARGMATCH (trace, optarg);
 642         break;
 643
 644       case 'V':
 645         version ();
 646         exit (EXIT_SUCCESS);
 647
 648       case 'f':
 649         FLAGS_ARGMATCH (flag, optarg);
 650         break;
 651
 652       case 'W':
 653         FLAGS_ARGMATCH (warnings, optarg);
 654         break;
 655
 656       case 'b':
 657         spec_file_prefix = AS_FILE_NAME (optarg);
 658         break;
 659
 660       case 'd':
 661         /* Here, the -d and --defines options are differentiated.  */
 662         defines_flag = true;
 663         if (optarg)
 664           {
 665             free (spec_defines_file);
 666             spec_defines_file = xstrdup (AS_FILE_NAME (optarg));
 667           }
 668         break;
 669
 670       case 'g':
 671         graph_flag = true;
 672         if (optarg)
 673           {
 674             free (spec_graph_file);
 675             spec_graph_file = xstrdup (AS_FILE_NAME (optarg));
 676           }
 677         break;
 678
 679       case 'h':
 680         usage (EXIT_SUCCESS);
 681
 682       case 'k':
 683         token_table_flag = true;
 684         break;
 685
 686       case 'l':
 687         no_lines_flag = true;
 688         break;
 689
 690       case 'o':
 691         spec_outfile = AS_FILE_NAME (optarg);
 692         break;
 693
 694       case 'p':
 695         spec_name_prefix = optarg;
 696         break;
 697
 698       case 'r':
 699         FLAGS_ARGMATCH (report, optarg);
 700         break;
 701
 702       case 't':
 703         debug = true;
 704         break;
 705
 706       case 'v':
 707         report_flag |= report_states;
 708         break;
 709
 710       case 'x':
 711         xml_flag = true;
 712         if (optarg)
 713           {
 714             free (spec_xml_file);
 715             spec_xml_file = xstrdup (AS_FILE_NAME (optarg));
 716           }
 717         break;
 718
 719       case 'y':
 720         yacc_flag = true;
 721         break;
 722
 723       case LOCATIONS_OPTION:
 724         locations_flag = true;
 725         break;
 726
 727       case PRINT_LOCALEDIR_OPTION:
 728         printf ("%s\n", LOCALEDIR);
 729         exit (EXIT_SUCCESS);
 730
 731       case PRINT_DATADIR_OPTION:
 732         printf ("%s\n", compute_pkgdatadir ());
 733         exit (EXIT_SUCCESS);
 734
 735       case REPORT_FILE_OPTION:
 736         free (spec_verbose_file);
 737         spec_verbose_file = xstrdup (AS_FILE_NAME (optarg));
 738         break;
 739
 740       default:
 741         usage (EXIT_FAILURE);
 742       }
 743
 744   if (argc - optind != 1)
 745     {
 746       if (argc - optind < 1)
 747         error (0, 0, _("%s: missing operand"), quotearg_colon (argv[argc - 1]));
 748       else
 749         error (0, 0, _("extra operand %s"), quote (argv[optind + 1]));
 750       usage (EXIT_FAILURE);
 751     }
 752
 753   current_file = grammar_file = uniqstr_new (argv[optind]);
 754   MUSCLE_INSERT_C_STRING ("file_name", grammar_file);
 755 }
 756
 757 void
 758 tr (char *s, char from, char to)
 759 {
 760   for (; *s; s++)
 761     if (*s == from)
 762       *s = to;
 763 }