aboutsummaryrefslogtreecommitdiff
path: root/src/lex.l
blob: 787bd88a537b4a0448297b9e435f6b2e9207627f (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
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
%top {
/* This file is part of Mailfromd.
   Copyright (C) 2005-2011, 2015-2017 Sergey Poznyakoff

   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 3, 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, see <http://www.gnu.org/licenses/>. */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
}

%option nounput

%{
#include <sys/types.h>	
#include <sys/stat.h>
#include "mailfromd.h"
#include "gram.h"
#include "prog.h"
#include "srvcfg.h"

static struct locus locus; /* Current input location */
static struct locus start_locus; /* Location when the last state switch
				    occurred */
static mu_opool_t string_pool;   /* Opool for constructing string values */
static char *multiline_delimiter; /* End of here-document delimiter */ 
static size_t multiline_delimiter_len; /* Length of multiline_delimiter_len */
static int multiline_unescape;         /* Unescape here-document contents */
static int (*char_to_strip)(char);     /* Strip matching characters of each
					  here-document line */

static int
is_tab(char c)
{
	return c == '\t';
}
 
static int
is_space(char c)
{
	return c == '\t' || c == ' ';
}

static unsigned char
c_unescape(unsigned char inc)
{
	int outc = mu_wordsplit_c_unquote_char(inc);
        return outc ? outc : inc;
}

#define line_begin string_begin
#define line_add string_add
#define line_add_char string_add_char
static void line_finish(void);
static void string(const char *str, size_t len);
static int isemptystr(char *text);
static int builtin_const(const char *s, size_t len);

/* External interface to locus */ 
const struct locus *
get_locus()
{
	return &locus;
}


/* Input context flags */
#define INCTX_MODULE     0x1  /* current input is a MFL module */
#define INCTX_HADINPUT   0x2  /* some statements has already been processed */
#define INCTX_IGNORE_BYE 0x4  /* ignore eventual `bye' statement, because
                                 this is an #included module */

/* Input context stack */
struct inctx {                     /* input context structure */
	struct inctx *parent;      /* parent context */
	struct locus locus;        /* locus where the context was pushed */
	struct input_file_ident id;/* file id structure to prevent recursion */
	FILE *file;                /* saved yyin */ 
	pid_t pp_pid;              /* preprocessor pid, if used */
	int inctx_flags;           /* input context flags */ 
	YY_BUFFER_STATE buf;       /* lex buffer state */
};

struct inctx *inctx_tos;           /* stack of input contexts */

/* Current input context: */
static pid_t pp_pid;               /* preprocessor pid */
static struct input_file_ident input_file_id;
static int inctx_flags;            /* input context flags */

/* If not 0, emit_token keeps a token that yylex must return on the
   next call. See YY_USER_ACTION below. */
static int emit_token;

/* Find on stack an input context that matches the given file id.
   Return pointer to the context. */
struct inctx *
inctx_locate(struct input_file_ident *id)
{
	struct inctx *ctx;

	for (ctx = inctx_tos; ctx; ctx = ctx->parent)
		if (ctx->id.device == id->device
		    && ctx->id.i_node == id->i_node)
			break;
	return ctx;
}
	
/* Push input context */	
static void
inctx_push()
{
	struct inctx *ctx = mu_alloc(sizeof(*ctx));

	ctx->locus = locus;
	ctx->id = input_file_id;
	ctx->file = yyin;
	ctx->pp_pid = pp_pid;
	ctx->inctx_flags = inctx_flags;
	ctx->buf = YY_CURRENT_BUFFER;
	ctx->parent = inctx_tos;
	inctx_tos = ctx;
}

/* Pop input context from the top of the stack into the current
   input context. Return 1 if there are no more contexts left. */
int
inctx_pop()
{
	struct inctx *ctx = inctx_tos;
	
	if (!ctx)
		return 1;

	inctx_tos = ctx->parent;
	
	locus = ctx->locus;
	yyin = ctx->file; 
	input_file_id = ctx->id;
	inctx_flags = ctx->inctx_flags;
	yy_delete_buffer(YY_CURRENT_BUFFER);
	yy_switch_to_buffer(ctx->buf);
	pp_pid = ctx->pp_pid;
	free(ctx);
	return 0;
}

/* Setup the scanner for input from the file NAME. Return 0 on success,
   and an appropriate EX_ code on error. See lex_new_source below. */
static int
lex_new_source_0(const char *name)
{
	if (ext_pp) {
		yyin = pp_extrn_start(name, &pp_pid);
		if (!yyin) {
			parse_error(_("unable to start external "
				      "preprocessor `%s': %s"),
				     ext_pp,
				     mu_strerror(errno));
			return EX_OSFILE;
		}
	} else {
		yyin = fopen(name, "r");
		if (!yyin) {
			parse_error(_("cannot open %s: %s"), name,
				    mu_strerror(errno));
			return EX_NOINPUT;
		}
	}
	yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
	assign_locus(&locus, name, "1");
	return EX_OK;
}

/* Save the current input context on stack and set up the scanner for
   input from the file NAME. Return 0 on success,
   and an appropriate EX_ code on error. */
int
lex_new_source(const char *name, int flag)
{
	int rc;
	struct stat st;
	struct input_file_ident id;
	struct inctx *pctx;
	
	if (stat(name, &st)) {
		parse_error(_("cannot open `%s': %s"),
			    name, mu_strerror(errno));
		return EX_NOINPUT;
	} else if (!S_ISREG(st.st_mode)) {
		parse_error(_("`%s' is not a regular file"), name);
		return EX_NOINPUT;
	}
	
	id.device = st.st_dev;
	id.i_node = st.st_ino;
	
	pctx = inctx_locate(&id);
	if (pctx) {
		parse_error(_("recursive inclusion"));
		if (pctx->parent)
			parse_error_locus(&pctx->parent->locus,
					  _("`%s' already included here"),
					  name);
		else
			parse_error(_("`%s' already included at top level"),
				    name);
		return 1;
	}
	
	if (flag == LEX_ONCE && source_lookup(&id))
		return 0;

	if (yyin)
		inctx_push();
	rc = lex_new_source_0(name);
	if (rc)
		inctx_pop();
	else {
		input_file_id = id;
		if (flag == LEX_MODULE) {
			inctx_flags = INCTX_MODULE;
			emit_token = T_MODBEG;
		} else
			inctx_flags = 0;
	}
	return rc;
}


/* Return constant or variable token corresponding to the current
   value of yylval.literal->text. */
static int
variable_or_const()
{
	struct variable *vptr;
	const struct constant *cptr;

	cptr = constant_lookup(yylval.literal->text);
	if (cptr) {
		const struct value *value_ptr = &cptr->value;
		switch (value_ptr->type) {
		case dtype_number:
			yylval.number = value_ptr->v.number;
			return T_NUMBER;

		case dtype_string:
			yylval.literal = value_ptr->v.literal;
			return T_STRING;
			
		default:
			abort();
		}
	}

	vptr = variable_lookup(yylval.literal->text);
	if (!vptr) {
		parse_error(_("variable %s is not defined"),
			    yylval.literal->text);
		return T_BOGUS;
	}
	add_xref(vptr, &locus);
	yylval.var = vptr;
	return T_VARIABLE;
}
	
/* Advance locus to the next line */
void
advance_line()
{
	++locus.line;
	locus.point = 0;
	locus.leng = 0;
}

/* Saved lexer state before entering COMMENT */
static int save_state;
/* Same as BEGIN, but also saves the current locus. It is then used
   to report unclosed constructs at the end of file. */
#define BEGIN_X(s) do { BEGIN(s); start_locus = locus; } while(0)

/* If emit_token is not 0, push back current input and return the value
   of emit_token. Clear emit_token before returning. */
#define YY_USER_ACTION							\
	if (emit_token) {						\
		int tok = emit_token;					\
		emit_token = 0;						\
		if (yy_flex_debug)					\
			fprintf(stderr, "--emitting %d (module %s)\n",	\
				tok,top_module->name);			\
		yyless(0);						\
 		yylloc.beg = yylloc.end = locus;			\
 		yylloc.beg.point -= yyleng;				\
		return tok;						\
  	} else {							\
  		locus.point += yyleng;					\
  		locus.leng = yyleng;					\
 		yylloc.beg = yylloc.end = locus;			\
 		yylloc.beg.point -= yyleng;				\
   	}


/* Read next input chunk. */
#define YY_INPUT(buf,result,max_size)					\
	if (yyin == NULL)						\
		result = YY_NULL;					\
	else if (((result = fread(buf, 1, max_size, yyin)) == 0)	\
		 && ferror(yyin))					\
		YY_FATAL_ERROR("input in flex scanner failed");

/* Redeclare main entry point. Actual yylex is defined in the code section
   below. */
#define YY_DECL static int lexscan(void)


/* String composer */
static struct locus string_beg;
static NODE *string_head, *string_tail;

static void
compose_add_node(NODE *node)
{
	if (string_tail)
		string_tail->next = node;
	else
		string_head = node;
	string_tail = node;
}

static void
compose_start(int state)
{
	if (string_head) {
		parse_error("INTERNAL ERROR: previous composition has not "
			    "finished when a new one started");
		abort();
	}
	string_beg = locus;
	string_beg.point -= string_beg.leng;
	BEGIN_X(state);
}

static int
compose_finish()
{
	if (string_tail != string_head) {
		while (string_head->next) {
			NODE *cat = alloc_node(node_type_concat,
					       &string_head->locus);
			NODE *next = string_head->next;
			cat->next = next->next;
			cat->v.concat.arg[0] = cast_to(dtype_string,
						       string_head);
			cat->v.concat.arg[1] = cast_to(dtype_string, next);
			string_head->next = next->next = NULL;
			string_head = cat;
		}
	}
	yylval.node = string_head;
	yylloc.beg = string_beg;
	string_head = string_tail = NULL;
	return T_COMPOSE;
}

static void
compose_add_literal(struct literal *lit)
{
	NODE *node = alloc_node(node_type_string, &locus);
	node->v.literal = lit;
	compose_add_node(node);
	if (yy_flex_debug)
		fprintf(stderr, "--add literal: '%s'\n", lit->text);
}

static void
compose_add_string(const char *text, size_t length)
{
	compose_add_literal(string_alloc(text, length));
}

static void
compose_add_number(long num)
{
	NODE *node = alloc_node(node_type_number, &locus);
	node->v.number = num;
	compose_add_node(node);
}

void
compose_add_builtin_const(const char *s, size_t len)
{
	const char *sval;
	long nval;
	
	switch (builtin_const_value(s, len, &sval, &nval)) {
	case dtype_number:
		compose_add_number(nval);
		break;

	case dtype_string:
		compose_add_string(sval, strlen(sval));
		break;

	default:
		abort();
	}
}

void
compose_add_variable_or_const(int what)
{
	switch (what) {
	case T_NUMBER:
		compose_add_number(yylval.number);
		break;

	case T_STRING:
		compose_add_literal(yylval.literal);
		break;

	case T_VARIABLE:
		compose_add_node(create_node_variable(yylval.var, &locus));
	}
}

%}

/* Exclusive states:

   SHELLMAGIC     Initial shell-magic boilerplate (#!... !#)
   COMMENT        Within a C-style comment;
   XIDENT         Expected identifier;
   STR            Processing a complex string;
   ML             Within a multi-line aggregator.  The line being built
                  requires stripping leading whitespace (if requested).
   CML            Continuation within a multi-line aggregator.  The line
                  being built does not require stripping leading whitespace.
   QML            Quoted multi-line aggregator.  No variable substitution and
                  unquoting is needed.

   Inclusive states:
   
   ONBLOCK	  Lexical tie-in after an `on' keyword.  In ONBLOCK state
                  the strigns `as', `host', `from', and `poll' are
		  recognized as keywords.  The string `for' also acquires
		  special meaning.
*/

%x COMMENT STR ML CML QML XIDENT SHELLMAGIC
%s ONBLOCK

N [0-9][0-9]*
P [1-9][0-9]*
X [0-9a-fA-F]
O [0-7]
WS [ \t][ \t]*
IDENT [a-zA-Z_][a-zA-Z_0-9]*
LOCUS __file__|__line__|__function__|__module__
VCONST __package__|__version__|__major__|__minor__|__patch__|__git__
STATEDIR __(def)?statedir__
PREPROC  __(def)?preproc__	
ICONST {LOCUS}|{VCONST}|{STATEDIR}|{PREPROC}
%%
         /* C-style comments */
<INITIAL,XIDENT>"/*"    { save_state = YYSTATE;  BEGIN_X(COMMENT); }
<COMMENT>[^*\n]*        /* eat anything that's not a '*' */
<COMMENT>"*"+[^*/\n]*   /* eat up '*'s not followed by '/'s */
<COMMENT>\n             advance_line();
<COMMENT>"*"+"/"        BEGIN(save_state);
         /* Shell magic sequence */
^#!" "?"/".*\n {
	if (locus.line == 1) {
		BEGIN_X(SHELLMAGIC);
	}
	advance_line();
      }
<SHELLMAGIC>^"!#"[ \t]*\n { advance_line(); BEGIN(INITIAL); }
<SHELLMAGIC>.*\n   { advance_line(); }
         /* Configuration directives */
^[ \t]*#[ \t]*{P}[ \t]+\".*\".*\n parse_line_cpp(yytext, &locus);
        /* Normally, everything within a comment should be ignored, so
	   the exclusive condition for the rule below is an error.
	   Unfortunately, GNU m4 in versions up to 1.4.9 outputs line
	   synchronisation directives in comments, which makes any decent
	   compiler lost trace of which input line it is on.  To avoid
	   this, mfd handles #line directives even within a C-comment
	   block.

	   This bug was fixed in m4 version 1.4.10.  I prefer to keep
	   this kludge until I am pretty sure there are no 1.4.9 around.
	*/
<INITIAL,COMMENT>^[ \t]*#[ \t]*line[ \t].*\n {
	parse_line(yytext, &locus);
}
^[ \t]*#[ \t]*pragma[ \t].*\n {
	yyless(yyleng-1);
	parse_pragma(yytext);
}
^[ \t]*#[ \t]*error[ \t].*\n  {
         yytext[yyleng-1] = 0; /* Kill trailing newline */
         parse_error("%s", yytext);
         advance_line();
}
^[ \t]*#[ \t]*include_once[ \t].*\n {
	parse_include(yytext, 1);
}
^[ \t]*#[ \t]*include[ \t].*\n {
	parse_include(yytext, 0);
}
         /* End-of-line comments */
#.*\n   { advance_line(); }
#.*     /* end-of-file comment */;
        /* expected identified (after 'require' or initial 'from') */
<XIDENT>{IDENT} { BEGIN(INITIAL);
	          string(yytext, yyleng);
		  return T_IDENTIFIER; }
<XIDENT>{WS}    ;
<XIDENT>\n      { advance_line(); }
<XIDENT>.       { BEGIN(INITIAL);
                  yyless(0); }
         /* Reserved words */
accept    return T_ACCEPT;
reject    return T_REJECT;
tempfail  return T_TEMPFAIL;
continue  return T_CONTINUE;
discard   return T_DISCARD;
add       return T_ADD;
replace   return T_REPLACE;
delete    return T_DELETE;
if        return T_IF;
fi        return T_FI;
else      return T_ELSE;
elif      return T_ELIF;
on        return T_ON;
do        return T_DO;
done      return T_DONE;
matches   return T_MATCHES;
fnmatches return T_FNMATCHES;
mx{WS}matches return T_MXMATCHES;
mx{WS}fnmatches return T_MXFNMATCHES;
when      return T_WHEN;
or        return T_OR;
and       return T_AND;
not       return T_NOT;
next      return T_NEXT;
prog      return T_PROG;
set       return T_SET;
catch     return T_CATCH;
try       return T_TRY;
echo      return T_ECHO;
return    return T_RETURN;
returns   return T_RETURNS;
func      return T_FUNC;
switch    return T_SWITCH;
case      return T_CASE;
default   return T_DEFAULT;
string/[ \t]*\( { yylval.type = dtype_string; return T_TYPECAST; }
number/[ \t]*\( { yylval.type = dtype_number; return T_TYPECAST; }
string    { yylval.type = dtype_string; return T_TYPE; }
number    { yylval.type = dtype_number; return T_TYPE; }
const     return T_CONST;
throw     return T_THROW;
loop      return T_LOOP;
while     return T_WHILE;
for       return T_FOR;
break     return T_BREAK;
pass      return T_PASS;
begin     return T_BEGIN;
end       return T_END;
alias     return T_ALIAS;
vaptr     return T_VAPTR;
precious  return T_PRECIOUS;
require   return T_REQUIRE;
import    return T_IMPORT;
from      return T_FROM;
static    return T_STATIC;
public    return T_PUBLIC;
module    {  if (inctx_tos && inctx_flags == 0) {
                int c;
		int flen;
		const char *fname = strrchr(locus.file, '/');

		if (fname)
			fname++;
		else
			fname = locus.file;
		flen = strlen(fname);
		
		if (flen > 3 && strcmp(fname + flen - 3, ".mf") == 0)
			flen -= 3;
		parse_warning_locus(&inctx_tos->locus,
				    _("including a module file is unreliable and may cause subtle errors"));
		/* TRANSLATORS: Do not translate `require %*.*s' */
		parse_warning_locus(&inctx_tos->locus,
				    _("use `require %*.*s' instead"),
				    flen, flen, fname);
		inctx_flags |= INCTX_IGNORE_BYE;
		start_locus = locus;
		while ((c = input()) != '.') {
		    if (c =