aboutsummaryrefslogtreecommitdiff
path: root/binutils/nlmheader.y
blob: 2b78b893e10c07260bd2c39852c2b40cbbda2aaf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
%{/* nlmheader.y - parse NLM header specification keywords.
     Copyright (C) 1993 Free Software Foundation, Inc.

This file is part of GNU Binutils.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* Written by Ian Lance Taylor <ian@cygnus.com>.

   This bison file parses the commands recognized by the NetWare NLM
   linker, except for lists of object files.  It stores the
   information in global variables.

   This implementation is based on the description in the NetWare Tool
   Maker Specification manual, edition 1.0.  */

#include <ansidecl.h>
#include <stdio.h>
#include <ctype.h>
#include <bfd.h>
#include "sysdep.h"
#include "bucomm.h"
#include "nlm/common.h"
#include "nlm/internal.h"
#include "nlmconv.h"

/* Information is stored in the structures pointed to by these
   variables.  */

Nlm_Internal_Fixed_Header *fixed_hdr;
Nlm_Internal_Variable_Header *var_hdr;
Nlm_Internal_Version_Header *version_hdr;
Nlm_Internal_Copyright_Header *copyright_hdr;
Nlm_Internal_Extended_Header *extended_hdr;

/* Procedure named by CHECK.  */
char *check_procedure;
/* File named by CUSTOM.  */
char *custom_file;
/* Whether to generate debugging information (DEBUG).  */
boolean debug_info;
/* Procedure named by EXIT.  */
char *exit_procedure;
/* Exported symbols (EXPORT).  */
struct string_list *export_symbols;
/* Map file name (MAP, FULLMAP).  */
char *map_file;
/* Whether a full map has been requested (FULLMAP).  */
boolean full_map;
/* File named by HELP.  */
char *help_file;
/* Imported symbols (IMPORT).  */
struct string_list *import_symbols;
/* File named by MESSAGES.  */
char *message_file;
/* Autoload module list (MODULE).  */
struct string_list *modules;
/* File named by SHARELIB.  */
char *sharelib_file;
/* Start procedure name (START).  */
char *start_procedure;
/* VERBOSE.  */
boolean verbose;
/* RPC description file (XDCDATA).  */
char *rpc_file;

/* The number of serious errors that have occurred.  */
int parse_errors;

/* The current symbol prefix when reading a list of import or export
   symbols.  */
static char *symbol_prefix;

/* Parser error message handler.  */
#define yyerror(msg) nlmheader_error (msg);

/* Local functions.  */
static int yylex PARAMS ((void));
static void nlmlex_file_push PARAMS ((const char *));
static boolean nlmlex_file_open PARAMS ((const char *));
static int nlmlex_buf_init PARAMS ((void));
static char nlmlex_buf_add PARAMS ((int));
static long nlmlex_get_number PARAMS ((const char *));
static void nlmheader_identify PARAMS ((void));
static void nlmheader_warn PARAMS ((const char *, int));
static void nlmheader_error PARAMS ((const char *));
static struct string_list * string_list_cons PARAMS ((char *,
						      struct string_list *));
static struct string_list * string_list_append PARAMS ((struct string_list *,
							struct string_list *));
static struct string_list * string_list_append1 PARAMS ((struct string_list *,
							 char *));
static char *xstrdup PARAMS ((const char *));

%}

%union
{
  char *string;
  struct string_list *list;
};

/* The reserved words.  */

%token CHECK CODESTART COPYRIGHT CUSTOM DATE DEBUG DESCRIPTION EXIT
%token EXPORT FLAG_ON FLAG_OFF FULLMAP HELP IMPORT INPUT MAP MESSAGES
%token MODULE MULTIPLE OS_DOMAIN OUTPUT PSEUDOPREEMPTION REENTRANT
%token SCREENNAME SHARELIB STACK STACKSIZE START SYNCHRONIZE
%token THREADNAME TYPE VERBOSE VERSION XDCDATA

/* Arguments.  */

%token <string> STRING
%token <string> QUOTED_STRING

/* Typed non-terminals.  */
%type <list> symbol_list_opt symbol_list module_list
%type <string> symbol

%%

/* Keywords must start in the leftmost column of the file.  Arguments
   may appear anywhere else.  The lexer uses this to determine what
   token to return, so we don't have to worry about it here.  */

/* The entire file is just a list of commands.  */

file:	
	  commands
	;

/* A possibly empty list of commands.  */

commands:
	  /* May be empty.  */
	| command commands
	;

/* A single command.  There is where most of the work takes place.  */

command:
	  CHECK STRING
	  {
	    check_procedure = $2;
	  }
	| CODESTART STRING
	  {
	    nlmheader_warn ("CODESTART is not implemented; sorry", -1);
	    free ($2);
	  }
	| COPYRIGHT QUOTED_STRING
	  {
	    int len;

	    strncpy (copyright_hdr->stamp, "CoPyRiGhT=", 10);
	    len = strlen ($2);
	    if (len >= NLM_MAX_COPYRIGHT_MESSAGE_LENGTH)
	      {
		nlmheader_warn ("copyright string is too long",
				NLM_MAX_COPYRIGHT_MESSAGE_LENGTH - 1);
		len = NLM_MAX_COPYRIGHT_MESSAGE_LENGTH - 1;
	      }
	    copyright_hdr->copyrightMessageLength = len;
	    strncpy (copyright_hdr->copyrightMessage, $2, len);
	    copyright_hdr->copyrightMessage[len] = '\0';
	    free ($2);
	  }
	| CUSTOM STRING
	  {
	    custom_file = $2;
	  }
	| DATE STRING STRING STRING
	  {
	    /* We don't set the version stamp here, because we use the
	       version stamp to detect whether the required VERSION
	       keyword was given.  */
	    version_hdr->month = nlmlex_get_number ($2);
	    version_hdr->day = nlmlex_get_number ($3);
	    version_hdr->year = nlmlex_get_number ($4);
	    free ($2);
	    free ($3);
	    free ($4);
	  }
	| DEBUG
	  {
	    debug_info = true;
	  }
	| DESCRIPTION QUOTED_STRING
	  {
	    int len;

	    len = strlen ($2);
	    if (len > NLM_MAX_DESCRIPTION_LENGTH)
	      {
		nlmheader_warn ("description string is too long",
				NLM_MAX_DESCRIPTION_LENGTH);
		len = NLM_MAX_DESCRIPTION_LENGTH;
	      }
	    var_hdr->descriptionLength = len;
	    strncpy (var_hdr->descriptionText, $2, len);
	    var_hdr->descriptionText[len] = '\0';
	    free ($2);
	  }
	| EXIT STRING
	  {
	    exit_procedure = $2;
	  }
	| EXPORT
	  {
	    symbol_prefix = NULL;
	  }
	  symbol_list_opt
	  {
	    export_symbols = string_list_append (export_symbols, $3);
	  }
	| FLAG_ON STRING
	  {
	    fixed_hdr->flags |= nlmlex_get_number ($2);
	    free ($2);
	  }
	| FLAG_OFF STRING
	  {
	    fixed_hdr->flags &=~ nlmlex_get_number ($2);
	    free ($2);
	  }
	| FULLMAP STRING
	  {
	    map_file = $2;
	    full_map = true;
	  }
	| HELP STRING
	  {
	    help_file = $2;
	  }
	| IMPORT
	  {
	    symbol_prefix = NULL;
	  }
	  symbol_list_opt
	  {
	    import_symbols = string_list_append (import_symbols, $3);
	  }
	| INPUT STRING
	  {
	    nlmheader_warn ("INPUT not supported", -1);
	    free ($2);
	  }
	| MAP STRING
	  {
	    map_file = $2;
	  }
	| MESSAGES STRING
	  {
	    message_file = $2;
	  }
	| MODULE module_list
	  {
	    modules = string_list_append (modules, $2);
	  }
	| MULTIPLE
	  {
	    fixed_hdr->flags |= 0x2;
	  }
	| OS_DOMAIN
	  {
	    fixed_hdr->flags |= 0x10;
	  }
	| OUTPUT STRING
	  {
	    nlmheader_warn ("OUTPUT not supported", -1);
	    free ($2);
	  }
	| PSEUDOPREEMPTION
	  {
	    fixed_hdr->flags |= 0x8;
	  }
	| REENTRANT
	  {
	    fixed_hdr->flags |= 0x1;
	  }
	| SCREENNAME QUOTED_STRING
	  {
	    int len;

	    len = strlen ($2);
	    if (len >= NLM_MAX_SCREEN_NAME_LENGTH)
	      {
		nlmheader_warn ("screen name is too long",
				NLM_MAX_SCREEN_NAME_LENGTH);
		len = NLM_MAX_SCREEN_NAME_LENGTH;
	      }
	    var_hdr->screenNameLength = len;
	    strncpy (var_hdr->screenName, $2, len);
	    var_hdr->screenName[NLM_MAX_SCREEN_NAME_LENGTH] = '\0';
	    free ($2);
	  }
	| SHARELIB STRING
	  {
	    sharelib_file = $2;
	  }
	| STACK STRING
	  {
	    var_hdr->stackSize = nlmlex_get_number ($2);
	    free ($2);
	  }
	| STACKSIZE STRING
	  {
	    var_hdr->stackSize = nlmlex_get_number ($2);
	    free ($2);
	  }
	| START STRING
	  {
	    start_procedure = $2;
	  }
	| SYNCHRONIZE
	  {
	    fixed_hdr->flags |= 0x4;
	  }
	| THREADNAME QUOTED_STRING
	  {
	    int len;

	    len = strlen ($2);
	    if (len >= NLM_MAX_THREAD_NAME_LENGTH)
	      {
		nlmheader_warn ("thread name is too long",
				NLM_MAX_THREAD_NAME_LENGTH);
		len = NLM_MAX_THREAD_NAME_LENGTH;
	      }
	    var_hdr->threadNameLength = len;
	    strncpy (var_hdr->threadName, $2, len);
	    var_hdr->screenName[NLM_MAX_THREAD_NAME_LENGTH] = '\0';
	    free ($2);
	  }
	| TYPE STRING
	  {
	    fixed_hdr->moduleType = nlmlex_get_number ($2);
	    free ($2);
	  }
	| VERBOSE
	  {
	    verbose = true;
	  }
	| VERSION STRING STRING STRING
	  {
	    long val;

	    strncpy (version_hdr->stamp, "VeRsIoN#", 8);
	    version_hdr->majorVersion = nlmlex_get_number ($2);
	    val = nlmlex_get_number ($3);
	    if (val < 0 || val > 99)
	      nlmheader_warn ("illegal minor version number (must be between 0 and 99)",
			      -1);
	    else
	      version_hdr->minorVersion = val;
	    val = nlmlex_get_number ($4);
	    if (val < 1 || val > 26)
	      nlmheader_warn ("illegal revision number (must be between 1 and 26)",
			      -1);
	    else
	      version_hdr->revision = val;
	    free ($2);
	    free ($3);
	    free ($4);
	  }
	| VERSION STRING STRING
	  {
	    long val;

	    strncpy (version_hdr->stamp, "VeRsIoN#", 8);
	    version_hdr->majorVersion = nlmlex_get_number ($2);
	    val = nlmlex_get_number ($3);
	    if (val < 0 || val > 99)
	      nlmheader_warn ("illegal minor version number (must be between 0 and 99)",
			      -1);
	    else
	      version_hdr->minorVersion = val;
	    version_hdr->revision = 0;
	    free ($2);
	    free ($3);
	  }
	| XDCDATA STRING
	  {
	    rpc_file = $2;
	  }
	;

/* A possibly empty list of symbols.  */

symbol_list_opt:
	  /* Empty.  */
	  {
	    $$ = NULL;
	  }
	| symbol_list
	  {
	    $$ = $1;
	  }
	;

/* A list of symbols in an import or export list.  Prefixes may appear
   in parentheses.  We need to use left recursion here to avoid
   building up a large import list on the parser stack.  */

symbol_list:
	  symbol
	  {
	    $$ = string_list_cons ($1, NULL);
	  }
	| symbol_prefix
	  {
	    $$ = NULL;
	  }
	| symbol_list symbol
	  {
	    $$ = string_list_append1 ($1, $2);
	  }
	| symbol_list symbol_prefix
	  {
	    $$ = $1;
	  }
	;

/* A prefix for subsequent symbols.  */

symbol_prefix:
	  '(' STRING ')'
	  {
	    if (symbol_prefix != NULL)
	      free (symbol_prefix);
	    symbol_prefix = $2;
	  }
	;

/* A single symbol.  */

symbol:
	  STRING
	  {
	    if (symbol_prefix == NULL)
	      $$ = $1;
	    else
	      {
		$$ = xmalloc (strlen (symbol_prefix) + strlen ($1) + 2);
		sprintf ($$, "%s@%s", symbol_prefix, $1);
		free ($1);
	      }
	  }
	;

/* A list of modules.  */

module_list:
	  /* May be empty.  */
	  {
	    $$ = NULL;
	  }
	| STRING module_list
	  {
	    $$ = string_list_cons ($1, $2);
	  }
	;

%%

/* If strerror is just a macro, we want to use the one from libiberty
   since it will handle undefined values.  */
#undef strerror
extern char *strerror ();

/* The lexer is simple, too simple for flex.  Keywords are only
   recognized at the start of lines.  Everything else must be an
   argument.  A comma is treated as whitespace.  */

/* The states the lexer can be in.  */

enum lex_state
{
  /* At the beginning of a line.  */
  BEGINNING_OF_LINE,
  /* In the middle of a line.  */
  IN_LINE
};

/* We need to keep a stack of files to handle file inclusion.  */

struct input
{
  /* The file to read from.  */
  FILE *file;
  /* The name of the file.  */
  char *name;
  /* The current line number.  */
  int lineno;
  /* The current state.  */
  enum lex_state state;
  /* The next file on the stack.  */
  struct input *next;
};

/* The current input file.  */

static struct input current;

/* The character which introduces comments.  */
#define COMMENT_CHAR '#'

/* Start the lexer going on the main input file.  */

boolean
nlmlex_file (name)
     const char *name;
{
  current.next = NULL;
  return nlmlex_file_open (name);
}

/* Start the lexer going on a subsidiary input file.  */

static void
nlmlex_file_push (name)
     const char *name;
{
  struct input *push;

  push = (struct input *) xmalloc (sizeof (struct input));
  *push = current;
  if (nlmlex_file_open (name))
    current.next = push;
  else
    {
      current = *push;
      free (push);
    }
}

/* Start lexing from a file.  */

static boolean
nlmlex_file_open (name)
     const char *name;
{
  current.file = fopen (name, "r");
  if (current.file == NULL)
    {
      fprintf (stderr, "%s:%s: %s\n", program_name, name, strerror (errno));
      ++parse_errors;
      return false;
    }
  current.name = xstrdup (name);
  current.lineno = 1;
  current.state = BEGINNING_OF_LINE;
  return true;
}

/* Table used to turn keywords into tokens.  */

struct keyword_tokens_struct
{
  const char *keyword;
  int token;
};

struct keyword_tokens_struct keyword_tokens[] =
{
  { "CHECK", CHECK },
  { "CODESTART", CODESTART },
  { "COPYRIGHT", COPYRIGHT },
  { "CUSTOM", CUSTOM },
  { "DATE", DATE },
  { "DEBUG", DEBUG },
  { "DESCRIPTION", DESCRIPTION },
  { "EXIT", EXIT },
  { "EXPORT", EXPORT },
  { "FLAG_ON", FLAG_ON },
  { "FLAG_OFF", FLAG_OFF },
  { "FULLMAP", FULLMAP },
  { "HELP", HELP },
  { "IMPORT", IMPORT },
  { "INPUT", INPUT },
  { "MAP", MAP },
  { "MESSAGES", MESSAGES },
  { "MODULE", MODULE },
  { "MULTIPLE", MULTIPLE },
  { "OS_DOMAIN", OS_DOMAIN },
  { "OUTPUT", OUTPUT },
  { "PSEUDOPREEMPTION", PSEUDOPREEMPTION },
  { "REENTRANT", REENTRANT },
  { "SCREENNAME", SCREENNAME },
  { "SHARELIB", SHARELIB },
  { "STACK", STACK },
  { "STACKSIZE", STACKSIZE },
  { "START", START },
  { "SYNCHRONIZE", SYNCHRONIZE },
  { "THREADNAME", THREADNAME },
  { "TYPE", TYPE },
  { "VERBOSE", VERBOSE },
  { "VERSION", VERSION },
  { "XDCDATA", XDCDATA }
};

#define KEYWORD_COUNT (sizeof (keyword_tokens) / sizeof (keyword_tokens[0]))

/* The lexer accumulates strings in these variables.  */
static char *lex_buf;
static int lex_size;
static int lex_pos;

/* Start accumulating strings into the buffer.  */
#define BUF_INIT() \
  ((void) (lex_buf != NULL ? lex_pos = 0 : nlmlex_buf_init ()))

static int
nlmlex_buf_init ()
{
  lex_size = 10;
  lex_buf = xmalloc (lex_size + 1);
  lex_pos = 0;
  return 0;
}

/* Finish a string in the buffer.  */
#define BUF_FINISH() ((void) (lex_buf[lex_pos] = '\0'))

/* Accumulate a character into the buffer.  */
#define BUF_ADD(c) \
  ((void) (lex_pos < lex_size \
	   ? lex_buf[lex_pos++] = (c) \
	   : nlmlex_buf_add (c)))

static char
nlmlex_buf_add (c)
     int c;
{
  if (lex_pos >= lex_size)
    {
      lex_size *= 2;
      lex_buf = xrealloc (lex_buf, lex_size + 1);
    }

  return lex_buf[lex_pos++] = c;
}

/* The lexer proper.  This is called by the bison generated parsing
   code.  */

static int
yylex ()
{
  int c;

tail_recurse:

  c = getc (current.file);

  /* Commas are treated as whitespace characters.  */
  while (isspace ((unsigned char) c) || c == ',')
    {
      current.state = IN_LINE;
      if (c == '\n')
	{
	  ++current.lineno;
	  current.state = BEGINNING_OF_LINE;
	}
      c = getc (current.file);
    }

  /* At the end of the file we either pop to the previous file or
     finish up.  */
  if (c == EOF)
    {
      fclose (current.file);
      free (current.name);
      if (current.next == NULL)
	return 0;
      else
	{
	  struct input *next;

	  next = current.next;
	  current = *next;
	  free (next);
	  goto tail_recurse;
	}
    }

  /* A comment character always means to drop everything until the
     next newline.  */
  if (c == COMMENT_CHAR)
    {
      do
	{
	  c = getc (current.file);
	}
      while (c != '\n');
      ++current.lineno;
      current.state = BEGINNING_OF_LINE;
      goto tail_recurse;
    }

  /* An '@' introduces an include file.  */
  if (c == '@')
    {
      do
	{
	  c = getc (current.file);
	  if (c == '\n')
	    ++current.lineno;
	}
      while (isspace ((unsigned char) c));
      BUF_INIT ();
      while (! isspace ((unsigned char) c) && c != EOF)
	{
	  BUF_ADD (c);
	  c = getc (current.file);
	}
      BUF_FINISH ();

      ungetc (c, current.file);
      
      nlmlex_file_push (lex_buf);
      goto tail_recurse;
    }

  /* A non-space character at the start of a line must be the start of
     a keyword.  */
  if (current.state == BEGINNING_OF_LINE)
    {
      BUF_INIT ();
      while (isalnum ((unsigned char) c) || c == '_')
	{
	  if (islower ((unsigned char) c))
	    BUF_ADD (toupper ((unsigned char) c));
	  else
	    BUF_ADD (c);
	  c = getc (current.file);
	}
      BUF_FINISH ();

      if (c != EOF && ! isspace ((unsigned char) c) && c != ',')
	{
	  nlmheader_identify ();
	  fprintf (stderr, "%s:%d: illegal character in keyword: %c\n",
		   current.name, current.lineno, c);
	}
      else
	{
	  int i;

	  for (i = 0; i < KEYWORD_COUNT; i++)
	    {
	      if (lex_buf[0] == keyword_tokens[i].keyword[0]
		  && strcmp (lex_buf, keyword_tokens[i].keyword) == 0)
		{
		  /* Pushing back the final whitespace avoids worrying
		     about \n here.  */
		  ungetc (c, current.file);
		  current.state = IN_LINE;
		  return keyword_tokens[i].token;
		}
	    }
	  
	  nlmheader_identify ();
	  fprintf (stderr, "%s:%d: unrecognized keyword: %s\n",
		   current.name, current.lineno, lex_buf);
	}

      ++parse_errors;
      /* Treat the rest of this line as a comment.  */
      ungetc (COMMENT_CHAR, current.file);
      goto tail_recurse;
    }

  /* Parentheses just represent themselves.  */
  if (c == '(' || c == ')')
    return c;

  /* Handle quoted strings.  */
  if (c == '"' || c == '\'')
    {
      int quote;
      int start_lineno;

      quote = c;
      start_lineno = current.lineno;

      c = getc (current.file);
      BUF_INIT ();
      while (c != quote && c != EOF)
	{
	  BUF_ADD (c);
	  if (c == '\n')
	    ++current.lineno;
	  c = getc (current.file);
	}
      BUF_FINISH ();

      if (c == EOF)
	{
	  nlmheader_identify ();
	  fprintf (stderr, "%s:%d: end of file in quoted string\n",
		   current.name, start_lineno);
	  ++parse_errors;
	}

      /* FIXME: Possible memory leak.  */
      yylval.string = xstrdup (lex_buf);
      return QUOTED_STRING;
    }

  /* Gather a generic argument.  */
  BUF_INIT ();
  while (! isspace (c)
	 && c != ','
	 && c != COMMENT_CHAR
	 && c != '('
	 && c != ')')
    {
      BUF_ADD (c);
      c = getc (current.file);
    }
  BUF_FINISH ();

  ungetc (c, current.file);

  /* FIXME: Possible memory leak.  */
  yylval.string = xstrdup (lex_buf);
  return STRING;
}

/* Get a number from a string.  */

static long
nlmlex_get_number (s)
     const char *s;
{
  long ret;
  char *send;

  ret = strtol (s, &send, 10);
  if (*send != '\0')
    nlmheader_warn ("bad number", -1);
  return ret;
}

/* Prefix the nlmconv warnings with a note as to where they come from.
   We don't use program_name on every warning, because then some
   versions of the emacs next-error function can't recognize the line
   number.  */

static void
nlmheader_identify ()
{
  static int done;

  if (! done)
    {
      fprintf (stderr, "%s: problems in NLM command language input:\n",
	       program_name);
      done = 1;
    }
}

/* Issue a warning.  */

static void
nlmheader_warn (s, imax)
     const char *s;
     int imax;
{
  nlmheader_identify ();
  fprintf (stderr, "%s:%d: %s", current.name, current.lineno, s);
  if (imax != -1)
    fprintf (stderr, " (max %d)", imax);
  fprintf (stderr, "\n");
}

/* Report an error.  */

static void
nlmheader_error (s)
     const char *s;
{
  nlmheader_warn (s, -1);
  ++parse_errors;
}

/* Add a string to a string list.  */

static struct string_list *
string_list_cons (s, l)
     char *s;
     struct string_list *l;
{
  struct string_list *ret;

  ret = (struct string_list *) xmalloc (sizeof (struct string_list));
  ret->next = l;
  ret->string = s;
  return ret;
}

/* Append a string list to another string list.  */

static struct string_list *
string_list_append (l1, l2)
     struct string_list *l1;
     struct string_list *l2;
{
  register struct string_list **pp;

  for (pp = &l1; *pp != NULL; pp = &(*pp)->next)
    ;
  *pp = l2;
  return l1;
}

/* Append a string to a string list.  */

static struct string_list *
string_list_append1 (l, s)
     struct string_list *l;
     char *s;
{
  struct string_list *n;
  register struct string_list **pp;

  n = (struct string_list *) xmalloc (sizeof (struct string_list));
  n->next = NULL;
  n->string = s;
  for (pp = &l; *pp != NULL; pp = &(*pp)->next)
    ;
  *pp = n;
  return l;
}

/* Duplicate a string in memory.  */

static char *
xstrdup (s)
     const char *s;
{
  unsigned long len;
  char *ret;

  len = strlen (s);
  ret = xmalloc (len + 1);
  strcpy (ret, s);
  return ret;
}