binutils/nlmheader.y

   1 %{/* nlmheader.y - parse NLM header specification keywords.
   2      Copyright 1993, 1994, 1995, 1997, 1998, 2001, 2002, 2003, 2007
   3      Free Software Foundation, Inc.
   4
   5 This file is part of GNU Binutils.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  20
  21 /* Written by Ian Lance Taylor <ian@cygnus.com>.
  22
  23    This bison file parses the commands recognized by the NetWare NLM
  24    linker, except for lists of object files.  It stores the
  25    information in global variables.
  26
  27    This implementation is based on the description in the NetWare Tool
  28    Maker Specification manual, edition 1.0.  */
  29
  30 #include "sysdep.h"
  31 #include "safe-ctype.h"
  32 #include "bfd.h"
  33 #include "nlm/common.h"
  34 #include "nlm/internal.h"
  35 #include "bucomm.h"
  36 #include "nlmconv.h"
  37
  38 /* Information is stored in the structures pointed to by these
  39    variables.  */
  40
  41 Nlm_Internal_Fixed_Header *fixed_hdr;
  42 Nlm_Internal_Variable_Header *var_hdr;
  43 Nlm_Internal_Version_Header *version_hdr;
  44 Nlm_Internal_Copyright_Header *copyright_hdr;
  45 Nlm_Internal_Extended_Header *extended_hdr;
  46
  47 /* Procedure named by CHECK.  */
  48 char *check_procedure;
  49 /* File named by CUSTOM.  */
  50 char *custom_file;
  51 /* Whether to generate debugging information (DEBUG).  */
  52 bfd_boolean debug_info;
  53 /* Procedure named by EXIT.  */
  54 char *exit_procedure;
  55 /* Exported symbols (EXPORT).  */
  56 struct string_list *export_symbols;
  57 /* List of files from INPUT.  */
  58 struct string_list *input_files;
  59 /* Map file name (MAP, FULLMAP).  */
  60 char *map_file;
  61 /* Whether a full map has been requested (FULLMAP).  */
  62 bfd_boolean full_map;
  63 /* File named by HELP.  */
  64 char *help_file;
  65 /* Imported symbols (IMPORT).  */
  66 struct string_list *import_symbols;
  67 /* File named by MESSAGES.  */
  68 char *message_file;
  69 /* Autoload module list (MODULE).  */
  70 struct string_list *modules;
  71 /* File named by OUTPUT.  */
  72 char *output_file;
  73 /* File named by SHARELIB.  */
  74 char *sharelib_file;
  75 /* Start procedure name (START).  */
  76 char *start_procedure;
  77 /* VERBOSE.  */
  78 bfd_boolean verbose;
  79 /* RPC description file (XDCDATA).  */
  80 char *rpc_file;
  81
  82 /* The number of serious errors that have occurred.  */
  83 int parse_errors;
  84
  85 /* The current symbol prefix when reading a list of import or export
  86    symbols.  */
  87 static char *symbol_prefix;
  88
  89 /* Parser error message handler.  */
  90 #define yyerror(msg) nlmheader_error (msg);
  91
  92 /* Local functions.  */
  93 static int yylex (void);
  94 static void nlmlex_file_push (const char *);
  95 static bfd_boolean nlmlex_file_open (const char *);
  96 static int nlmlex_buf_init (void);
  97 static char nlmlex_buf_add (int);
  98 static long nlmlex_get_number (const char *);
  99 static void nlmheader_identify (void);
 100 static void nlmheader_warn (const char *, int);
 101 static void nlmheader_error (const char *);
 102 static struct string_list * string_list_cons (char *, struct string_list *);
 103 static struct string_list * string_list_append (struct string_list *,
 104                                                 struct string_list *);
 105 static struct string_list * string_list_append1 (struct string_list *,
 106                                                  char *);
 107 static char *xstrdup (const char *);
 108
 109 %}
 110
 111 %union
 112 {
 113   char *string;
 114   struct string_list *list;
 115 };
 116
 117 /* The reserved words.  */
 118
 119 %token CHECK CODESTART COPYRIGHT CUSTOM DATE DEBUG DESCRIPTION EXIT
 120 %token EXPORT FLAG_ON FLAG_OFF FULLMAP HELP IMPORT INPUT MAP MESSAGES
 121 %token MODULE MULTIPLE OS_DOMAIN OUTPUT PSEUDOPREEMPTION REENTRANT
 122 %token SCREENNAME SHARELIB STACK START SYNCHRONIZE
 123 %token THREADNAME TYPE VERBOSE VERSIONK XDCDATA
 124
 125 /* Arguments.  */
 126
 127 %token <string> STRING
 128 %token <string> QUOTED_STRING
 129
 130 /* Typed non-terminals.  */
 131 %type <list> symbol_list_opt symbol_list string_list
 132 %type <string> symbol
 133
 134 %%
 135
 136 /* Keywords must start in the leftmost column of the file.  Arguments
 137    may appear anywhere else.  The lexer uses this to determine what
 138    token to return, so we don't have to worry about it here.  */
 139
 140 /* The entire file is just a list of commands.  */
 141
 142 file:
 143           commands
 144         ;
 145
 146 /* A possibly empty list of commands.  */
 147
 148 commands:
 149           /* May be empty.  */
 150         | command commands
 151         ;
 152
 153 /* A single command.  There is where most of the work takes place.  */
 154
 155 command:
 156           CHECK STRING
 157           {
 158             check_procedure = $2;
 159           }
 160         | CODESTART STRING
 161           {
 162             nlmheader_warn (_("CODESTART is not implemented; sorry"), -1);
 163             free ($2);
 164           }
 165         | COPYRIGHT QUOTED_STRING
 166           {
 167             int len;
 168
 169             strncpy (copyright_hdr->stamp, "CoPyRiGhT=", 10);
 170             len = strlen ($2);
 171             if (len >= NLM_MAX_COPYRIGHT_MESSAGE_LENGTH)
 172               {
 173                 nlmheader_warn (_("copyright string is too long"),
 174                                 NLM_MAX_COPYRIGHT_MESSAGE_LENGTH - 1);
 175                 len = NLM_MAX_COPYRIGHT_MESSAGE_LENGTH - 1;
 176               }
 177             copyright_hdr->copyrightMessageLength = len;
 178             strncpy (copyright_hdr->copyrightMessage, $2, len);
 179             copyright_hdr->copyrightMessage[len] = '\0';
 180             free ($2);
 181           }
 182         | CUSTOM STRING
 183           {
 184             custom_file = $2;
 185           }
 186         | DATE STRING STRING STRING
 187           {
 188             /* We don't set the version stamp here, because we use the
 189                version stamp to detect whether the required VERSION
 190                keyword was given.  */
 191             version_hdr->month = nlmlex_get_number ($2);
 192             version_hdr->day = nlmlex_get_number ($3);
 193             version_hdr->year = nlmlex_get_number ($4);
 194             free ($2);
 195             free ($3);
 196             free ($4);
 197             if (version_hdr->month < 1 || version_hdr->month > 12)
 198               nlmheader_warn (_("illegal month"), -1);
 199             if (version_hdr->day < 1 || version_hdr->day > 31)
 200               nlmheader_warn (_("illegal day"), -1);
 201             if (version_hdr->year < 1900 || version_hdr->year > 3000)
 202               nlmheader_warn (_("illegal year"), -1);
 203           }
 204         | DEBUG
 205           {
 206             debug_info = TRUE;
 207           }
 208         | DESCRIPTION QUOTED_STRING
 209           {
 210             int len;
 211
 212             len = strlen ($2);
 213             if (len > NLM_MAX_DESCRIPTION_LENGTH)
 214               {
 215                 nlmheader_warn (_("description string is too long"),
 216                                 NLM_MAX_DESCRIPTION_LENGTH);
 217                 len = NLM_MAX_DESCRIPTION_LENGTH;
 218               }
 219             var_hdr->descriptionLength = len;
 220             strncpy (var_hdr->descriptionText, $2, len);
 221             var_hdr->descriptionText[len] = '\0';
 222             free ($2);
 223           }
 224         | EXIT STRING
 225           {
 226             exit_procedure = $2;
 227           }
 228         | EXPORT
 229           {
 230             symbol_prefix = NULL;
 231           }
 232           symbol_list_opt
 233           {
 234             export_symbols = string_list_append (export_symbols, $3);
 235           }
 236         | FLAG_ON STRING
 237           {
 238             fixed_hdr->flags |= nlmlex_get_number ($2);
 239             free ($2);
 240           }
 241         | FLAG_OFF STRING
 242           {
 243             fixed_hdr->flags &=~ nlmlex_get_number ($2);
 244             free ($2);
 245           }
 246         | FULLMAP
 247           {
 248             map_file = "";
 249             full_map = TRUE;
 250           }
 251         | FULLMAP STRING
 252           {
 253             map_file = $2;
 254             full_map = TRUE;
 255           }
 256         | HELP STRING
 257           {
 258             help_file = $2;
 259           }
 260         | IMPORT
 261           {
 262             symbol_prefix = NULL;
 263           }
 264           symbol_list_opt
 265           {
 266             import_symbols = string_list_append (import_symbols, $3);
 267           }
 268         | INPUT string_list
 269           {
 270             input_files = string_list_append (input_files, $2);
 271           }
 272         | MAP
 273           {
 274             map_file = "";
 275           }
 276         | MAP STRING
 277           {
 278             map_file = $2;
 279           }
 280         | MESSAGES STRING
 281           {
 282             message_file = $2;
 283           }
 284         | MODULE string_list
 285           {
 286             modules = string_list_append (modules, $2);
 287           }
 288         | MULTIPLE
 289           {
 290             fixed_hdr->flags |= 0x2;
 291           }
 292         | OS_DOMAIN
 293           {
 294             fixed_hdr->flags |= 0x10;
 295           }
 296         | OUTPUT STRING
 297           {
 298             if (output_file == NULL)
 299               output_file = $2;
 300             else
 301               nlmheader_warn (_("ignoring duplicate OUTPUT statement"), -1);
 302           }
 303         | PSEUDOPREEMPTION
 304           {
 305             fixed_hdr->flags |= 0x8;
 306           }
 307         | REENTRANT
 308           {
 309             fixed_hdr->flags |= 0x1;
 310           }
 311         | SCREENNAME QUOTED_STRING
 312           {
 313             int len;
 314
 315             len = strlen ($2);
 316             if (len >= NLM_MAX_SCREEN_NAME_LENGTH)
 317               {
 318                 nlmheader_warn (_("screen name is too long"),
 319                                 NLM_MAX_SCREEN_NAME_LENGTH);
 320                 len = NLM_MAX_SCREEN_NAME_LENGTH;
 321               }
 322             var_hdr->screenNameLength = len;
 323             strncpy (var_hdr->screenName, $2, len);
 324             var_hdr->screenName[NLM_MAX_SCREEN_NAME_LENGTH] = '\0';
 325             free ($2);
 326           }
 327         | SHARELIB STRING
 328           {
 329             sharelib_file = $2;
 330           }
 331         | STACK STRING
 332           {
 333             var_hdr->stackSize = nlmlex_get_number ($2);
 334             free ($2);
 335           }
 336         | START STRING
 337           {
 338             start_procedure = $2;
 339           }
 340         | SYNCHRONIZE
 341           {
 342             fixed_hdr->flags |= 0x4;
 343           }
 344         | THREADNAME QUOTED_STRING
 345           {
 346             int len;
 347
 348             len = strlen ($2);
 349             if (len >= NLM_MAX_THREAD_NAME_LENGTH)
 350               {
 351                 nlmheader_warn (_("thread name is too long"),
 352                                 NLM_MAX_THREAD_NAME_LENGTH);
 353                 len = NLM_MAX_THREAD_NAME_LENGTH;
 354               }
 355             var_hdr->threadNameLength = len;
 356             strncpy (var_hdr->threadName, $2, len);
 357             var_hdr->threadName[len] = '\0';
 358             free ($2);
 359           }
 360         | TYPE STRING
 361           {
 362             fixed_hdr->moduleType = nlmlex_get_number ($2);
 363             free ($2);
 364           }
 365         | VERBOSE
 366           {
 367             verbose = TRUE;
 368           }
 369         | VERSIONK STRING STRING STRING
 370           {
 371             long val;
 372
 373             strncpy (version_hdr->stamp, "VeRsIoN#", 8);
 374             version_hdr->majorVersion = nlmlex_get_number ($2);
 375             val = nlmlex_get_number ($3);
 376             if (val < 0 || val > 99)
 377               nlmheader_warn (_("illegal minor version number (must be between 0 and 99)"),
 378                               -1);
 379             else
 380               version_hdr->minorVersion = val;
 381             val = nlmlex_get_number ($4);
 382             if (val < 0)
 383               nlmheader_warn (_("illegal revision number (must be between 0 and 26)"),
 384                               -1);
 385             else if (val > 26)
 386               version_hdr->revision = 0;
 387             else
 388               version_hdr->revision = val;
 389             free ($2);
 390             free ($3);
 391             free ($4);
 392           }
 393         | VERSIONK STRING STRING
 394           {
 395             long val;
 396
 397             strncpy (version_hdr->stamp, "VeRsIoN#", 8);
 398             version_hdr->majorVersion = nlmlex_get_number ($2);
 399             val = nlmlex_get_number ($3);
 400             if (val < 0 || val > 99)
 401               nlmheader_warn (_("illegal minor version number (must be between 0 and 99)"),
 402                               -1);
 403             else
 404               version_hdr->minorVersion = val;
 405             version_hdr->revision = 0;
 406             free ($2);
 407             free ($3);
 408           }
 409         | XDCDATA STRING
 410           {
 411             rpc_file = $2;
 412           }
 413         ;
 414
 415 /* A possibly empty list of symbols.  */
 416
 417 symbol_list_opt:
 418           /* Empty.  */
 419           {
 420             $$ = NULL;
 421           }
 422         | symbol_list
 423           {
 424             $$ = $1;
 425           }
 426         ;
 427
 428 /* A list of symbols in an import or export list.  Prefixes may appear
 429    in parentheses.  We need to use left recursion here to avoid
 430    building up a large import list on the parser stack.  */
 431
 432 symbol_list:
 433           symbol
 434           {
 435             $$ = string_list_cons ($1, NULL);
 436           }
 437         | symbol_prefix
 438           {
 439             $$ = NULL;
 440           }
 441         | symbol_list symbol
 442           {
 443             $$ = string_list_append1 ($1, $2);
 444           }
 445         | symbol_list symbol_prefix
 446           {
 447             $$ = $1;
 448           }
 449         ;
 450
 451 /* A prefix for subsequent symbols.  */
 452
 453 symbol_prefix:
 454           '(' STRING ')'
 455           {
 456             if (symbol_prefix != NULL)
 457               free (symbol_prefix);
 458             symbol_prefix = $2;
 459           }
 460         ;
 461
 462 /* A single symbol.  */
 463
 464 symbol:
 465           STRING
 466           {
 467             if (symbol_prefix == NULL)
 468               $$ = $1;
 469             else
 470               {
 471                 $$ = xmalloc (strlen (symbol_prefix) + strlen ($1) + 2);
 472                 sprintf ($$, "%s@%s", symbol_prefix, $1);
 473                 free ($1);
 474               }
 475           }
 476         ;
 477
 478 /* A list of strings.  */
 479
 480 string_list:
 481           /* May be empty.  */
 482           {
 483             $$ = NULL;
 484           }
 485         | STRING string_list
 486           {
 487             $$ = string_list_cons ($1, $2);
 488           }
 489         ;
 490
 491 %%
 492
 493 /* If strerror is just a macro, we want to use the one from libiberty
 494    since it will handle undefined values.  */
 495 #undef strerror
 496 extern char *strerror PARAMS ((int));
 497
 498 /* The lexer is simple, too simple for flex.  Keywords are only
 499    recognized at the start of lines.  Everything else must be an
 500    argument.  A comma is treated as whitespace.  */
 501
 502 /* The states the lexer can be in.  */
 503
 504 enum lex_state
 505 {
 506   /* At the beginning of a line.  */
 507   BEGINNING_OF_LINE,
 508   /* In the middle of a line.  */
 509   IN_LINE
 510 };
 511
 512 /* We need to keep a stack of files to handle file inclusion.  */
 513
 514 struct input
 515 {
 516   /* The file to read from.  */
 517   FILE *file;
 518   /* The name of the file.  */
 519   char *name;
 520   /* The current line number.  */
 521   int lineno;
 522   /* The current state.  */
 523   enum lex_state state;
 524   /* The next file on the stack.  */
 525   struct input *next;
 526 };
 527
 528 /* The current input file.  */
 529
 530 static struct input current;
 531
 532 /* The character which introduces comments.  */
 533 #define COMMENT_CHAR '#'
 534 \f
 535 /* Start the lexer going on the main input file.  */
 536
 537 bfd_boolean
 538 nlmlex_file (const char *name)
 539 {
 540   current.next = NULL;
 541   return nlmlex_file_open (name);
 542 }
 543
 544 /* Start the lexer going on a subsidiary input file.  */
 545
 546 static void
 547 nlmlex_file_push (const char *name)
 548 {
 549   struct input *push;
 550
 551   push = (struct input *) xmalloc (sizeof (struct input));
 552   *push = current;
 553   if (nlmlex_file_open (name))
 554     current.next = push;
 555   else
 556     {
 557       current = *push;
 558       free (push);
 559     }
 560 }
 561
 562 /* Start lexing from a file.  */
 563
 564 static bfd_boolean
 565 nlmlex_file_open (const char *name)
 566 {
 567   current.file = fopen (name, "r");
 568   if (current.file == NULL)
 569     {
 570       fprintf (stderr, "%s:%s: %s\n", program_name, name, strerror (errno));
 571       ++parse_errors;
 572       return FALSE;
 573     }
 574   current.name = xstrdup (name);
 575   current.lineno = 1;
 576   current.state = BEGINNING_OF_LINE;
 577   return TRUE;
 578 }
 579 \f
 580 /* Table used to turn keywords into tokens.  */
 581
 582 struct keyword_tokens_struct
 583 {
 584   const char *keyword;
 585   int token;
 586 };
 587
 588 static struct keyword_tokens_struct keyword_tokens[] =
 589 {
 590   { "CHECK", CHECK },
 591   { "CODESTART", CODESTART },
 592   { "COPYRIGHT", COPYRIGHT },
 593   { "CUSTOM", CUSTOM },
 594   { "DATE", DATE },
 595   { "DEBUG", DEBUG },
 596   { "DESCRIPTION", DESCRIPTION },
 597   { "EXIT", EXIT },
 598   { "EXPORT", EXPORT },
 599   { "FLAG_ON", FLAG_ON },
 600   { "FLAG_OFF", FLAG_OFF },
 601   { "FULLMAP", FULLMAP },
 602   { "HELP", HELP },
 603   { "IMPORT", IMPORT },
 604   { "INPUT", INPUT },
 605   { "MAP", MAP },
 606   { "MESSAGES", MESSAGES },
 607   { "MODULE", MODULE },
 608   { "MULTIPLE", MULTIPLE },
 609   { "OS_DOMAIN", OS_DOMAIN },
 610   { "OUTPUT", OUTPUT },
 611   { "PSEUDOPREEMPTION", PSEUDOPREEMPTION },
 612   { "REENTRANT", REENTRANT },
 613   { "SCREENNAME", SCREENNAME },
 614   { "SHARELIB", SHARELIB },
 615   { "STACK", STACK },
 616   { "STACKSIZE", STACK },
 617   { "START", START },
 618   { "SYNCHRONIZE", SYNCHRONIZE },
 619   { "THREADNAME", THREADNAME },
 620   { "TYPE", TYPE },
 621   { "VERBOSE", VERBOSE },
 622   { "VERSION", VERSIONK },
 623   { "XDCDATA", XDCDATA }
 624 };
 625
 626 #define KEYWORD_COUNT (sizeof (keyword_tokens) / sizeof (keyword_tokens[0]))
 627 \f
 628 /* The lexer accumulates strings in these variables.  */
 629 static char *lex_buf;
 630 static int lex_size;
 631 static int lex_pos;
 632
 633 /* Start accumulating strings into the buffer.  */
 634 #define BUF_INIT() \
 635   ((void) (lex_buf != NULL ? lex_pos = 0 : nlmlex_buf_init ()))
 636
 637 static int
 638 nlmlex_buf_init (void)
 639 {
 640   lex_size = 10;
 641   lex_buf = xmalloc (lex_size + 1);
 642   lex_pos = 0;
 643   return 0;
 644 }
 645
 646 /* Finish a string in the buffer.  */
 647 #define BUF_FINISH() ((void) (lex_buf[lex_pos] = '\0'))
 648
 649 /* Accumulate a character into the buffer.  */
 650 #define BUF_ADD(c) \
 651   ((void) (lex_pos < lex_size \
 652            ? lex_buf[lex_pos++] = (c) \
 653            : nlmlex_buf_add (c)))
 654
 655 static char
 656 nlmlex_buf_add (int c)
 657 {
 658   if (lex_pos >= lex_size)
 659     {
 660       lex_size *= 2;
 661       lex_buf = xrealloc (lex_buf, lex_size + 1);
 662     }
 663
 664   return lex_buf[lex_pos++] = c;
 665 }
 666 \f
 667 /* The lexer proper.  This is called by the bison generated parsing
 668    code.  */
 669
 670 static int
 671 yylex (void)
 672 {
 673   int c;
 674
 675 tail_recurse:
 676
 677   c = getc (current.file);
 678
 679   /* Commas are treated as whitespace characters.  */
 680   while (ISSPACE (c) || c == ',')
 681     {
 682       current.state = IN_LINE;
 683       if (c == '\n')
 684         {
 685           ++current.lineno;
 686           current.state = BEGINNING_OF_LINE;
 687         }
 688       c = getc (current.file);
 689     }
 690
 691   /* At the end of the file we either pop to the previous file or
 692      finish up.  */
 693   if (c == EOF)
 694     {
 695       fclose (current.file);
 696       free (current.name);
 697       if (current.next == NULL)
 698         return 0;
 699       else
 700         {
 701           struct input *next;
 702
 703           next = current.next;
 704           current = *next;
 705           free (next);
 706           goto tail_recurse;
 707         }
 708     }
 709
 710   /* A comment character always means to drop everything until the
 711      next newline.  */
 712   if (c == COMMENT_CHAR)
 713     {
 714       do
 715         {
 716           c = getc (current.file);
 717         }
 718       while (c != '\n');
 719       ++current.lineno;
 720       current.state = BEGINNING_OF_LINE;
 721       goto tail_recurse;
 722     }
 723
 724   /* An '@' introduces an include file.  */
 725   if (c == '@')
 726     {
 727       do
 728         {
 729           c = getc (current.file);
 730           if (c == '\n')
 731             ++current.lineno;
 732         }
 733       while (ISSPACE (c));
 734       BUF_INIT ();
 735       while (! ISSPACE (c) && c != EOF)
 736         {
 737           BUF_ADD (c);
 738           c = getc (current.file);
 739         }
 740       BUF_FINISH ();
 741
 742       ungetc (c, current.file);
 743
 744       nlmlex_file_push (lex_buf);
 745       goto tail_recurse;
 746     }
 747
 748   /* A non-space character at the start of a line must be the start of
 749      a keyword.  */
 750   if (current.state == BEGINNING_OF_LINE)
 751     {
 752       BUF_INIT ();
 753       while (ISALNUM (c) || c == '_')
 754         {
 755           BUF_ADD (TOUPPER (c));
 756           c = getc (current.file);
 757         }
 758       BUF_FINISH ();
 759
 760       if (c != EOF && ! ISSPACE (c) && c != ',')
 761         {
 762           nlmheader_identify ();
 763           fprintf (stderr, _("%s:%d: illegal character in keyword: %c\n"),
 764                    current.name, current.lineno, c);
 765         }
 766       else
 767         {
 768           unsigned int i;
 769
 770           for (i = 0; i < KEYWORD_COUNT; i++)
 771             {
 772               if (lex_buf[0] == keyword_tokens[i].keyword[0]
 773                   && strcmp (lex_buf, keyword_tokens[i].keyword) == 0)
 774                 {
 775                   /* Pushing back the final whitespace avoids worrying
 776                      about \n here.  */
 777                   ungetc (c, current.file);
 778                   current.state = IN_LINE;
 779                   return keyword_tokens[i].token;
 780                 }
 781             }
 782
 783           nlmheader_identify ();
 784           fprintf (stderr, _("%s:%d: unrecognized keyword: %s\n"),
 785                    current.name, current.lineno, lex_buf);
 786         }
 787
 788       ++parse_errors;
 789       /* Treat the rest of this line as a comment.  */
 790       ungetc (COMMENT_CHAR, current.file);
 791       goto tail_recurse;
 792     }
 793
 794   /* Parentheses just represent themselves.  */
 795   if (c == '(' || c == ')')
 796     return c;
 797
 798   /* Handle quoted strings.  */
 799   if (c == '"' || c == '\'')
 800     {
 801       int quote;
 802       int start_lineno;
 803
 804       quote = c;
 805       start_lineno = current.lineno;
 806
 807       c = getc (current.file);
 808       BUF_INIT ();
 809       while (c != quote && c != EOF)
 810         {
 811           BUF_ADD (c);
 812           if (c == '\n')
 813             ++current.lineno;
 814           c = getc (current.file);
 815         }
 816       BUF_FINISH ();
 817
 818       if (c == EOF)
 819         {
 820           nlmheader_identify ();
 821           fprintf (stderr, _("%s:%d: end of file in quoted string\n"),
 822                    current.name, start_lineno);
 823           ++parse_errors;
 824         }
 825
 826       /* FIXME: Possible memory leak.  */
 827       yylval.string = xstrdup (lex_buf);
 828       return QUOTED_STRING;
 829     }
 830
 831   /* Gather a generic argument.  */
 832   BUF_INIT ();
 833   while (! ISSPACE (c)
 834          && c != ','
 835          && c != COMMENT_CHAR
 836          && c != '('
 837          && c != ')')
 838     {
 839       BUF_ADD (c);
 840       c = getc (current.file);
 841     }
 842   BUF_FINISH ();
 843
 844   ungetc (c, current.file);
 845
 846   /* FIXME: Possible memory leak.  */
 847   yylval.string = xstrdup (lex_buf);
 848   return STRING;
 849 }
 850 \f
 851 /* Get a number from a string.  */
 852
 853 static long
 854 nlmlex_get_number (const char *s)
 855 {
 856   long ret;
 857   char *send;
 858
 859   ret = strtol (s, &send, 10);
 860   if (*send != '\0')
 861     nlmheader_warn (_("bad number"), -1);
 862   return ret;
 863 }
 864
 865 /* Prefix the nlmconv warnings with a note as to where they come from.
 866    We don't use program_name on every warning, because then some
 867    versions of the emacs next-error function can't recognize the line
 868    number.  */
 869
 870 static void
 871 nlmheader_identify (void)
 872 {
 873   static int done;
 874
 875   if (! done)
 876     {
 877       fprintf (stderr, _("%s: problems in NLM command language input:\n"),
 878                program_name);
 879       done = 1;
 880     }
 881 }
 882
 883 /* Issue a warning.  */
 884
 885 static void
 886 nlmheader_warn (const char *s, int imax)
 887 {
 888   nlmheader_identify ();
 889   fprintf (stderr, "%s:%d: %s", current.name, current.lineno, s);
 890   if (imax != -1)
 891     fprintf (stderr, " (max %d)", imax);
 892   fprintf (stderr, "\n");
 893 }
 894
 895 /* Report an error.  */
 896
 897 static void
 898 nlmheader_error (const char *s)
 899 {
 900   nlmheader_warn (s, -1);
 901   ++parse_errors;
 902 }
 903
 904 /* Add a string to a string list.  */
 905
 906 static struct string_list *
 907 string_list_cons (char *s, struct string_list *l)
 908 {
 909   struct string_list *ret;
 910
 911   ret = (struct string_list *) xmalloc (sizeof (struct string_list));
 912   ret->next = l;
 913   ret->string = s;
 914   return ret;
 915 }
 916
 917 /* Append a string list to another string list.  */
 918
 919 static struct string_list *
 920 string_list_append (struct string_list *l1, struct string_list *l2)
 921 {
 922   register struct string_list **pp;
 923
 924   for (pp = &l1; *pp != NULL; pp = &(*pp)->next)
 925     ;
 926   *pp = l2;
 927   return l1;
 928 }
 929
 930 /* Append a string to a string list.  */
 931
 932 static struct string_list *
 933 string_list_append1 (struct string_list *l, char *s)
 934 {
 935   struct string_list *n;
 936   register struct string_list **pp;
 937
 938   n = (struct string_list *) xmalloc (sizeof (struct string_list));
 939   n->next = NULL;
 940   n->string = s;
 941   for (pp = &l; *pp != NULL; pp = &(*pp)->next)
 942     ;
 943   *pp = n;
 944   return l;
 945 }
 946
 947 /* Duplicate a string in memory.  */
 948
 949 static char *
 950 xstrdup (const char *s)
 951 {
 952   unsigned long len;
 953   char *ret;
 954
 955   len = strlen (s);
 956   ret = xmalloc (len + 1);
 957   strcpy (ret, s);
 958   return ret;
 959 }