summaryrefslogtreecommitdiff
path: root/src/misc.c
blob: 0dd8f5087430a0c8860df1b1d161cdc7cc3983ca (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
/* misc - miscellaneous flex routines */

/*  Copyright (c) 1990 The Regents of the University of California. */
/*  All rights reserved. */

/*  This code is derived from software contributed to Berkeley by */
/*  Vern Paxson. */

/*  The United States Government has rights in this work pursuant */
/*  to contract no. DE-AC03-76SF00098 between the United States */
/*  Department of Energy and the University of California. */

/*  This file is part of flex. */

/*  Redistribution and use in source and binary forms, with or without */
/*  modification, are permitted provided that the following conditions */
/*  are met: */

/*  1. Redistributions of source code must retain the above copyright */
/*     notice, this list of conditions and the following disclaimer. */
/*  2. Redistributions in binary form must reproduce the above copyright */
/*     notice, this list of conditions and the following disclaimer in the */
/*     documentation and/or other materials provided with the distribution. */

/*  Neither the name of the University nor the names of its contributors */
/*  may be used to endorse or promote products derived from this software */
/*  without specific prior written permission. */

/*  THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
/*  IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
/*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
/*  PURPOSE. */

#include "flexdef.h"
#include "tables.h"

#define CMD_IF_TABLES_SER    "%if-tables-serialization"
#define CMD_TABLES_YYDMAP    "%tables-yydmap"
#define CMD_DEFINE_YYTABLES  "%define-yytables"
#define CMD_IF_CPP_ONLY      "%if-c++-only"
#define CMD_IF_C_ONLY        "%if-c-only"
#define CMD_IF_C_OR_CPP      "%if-c-or-c++"
#define CMD_NOT_FOR_HEADER   "%not-for-header"
#define CMD_OK_FOR_HEADER    "%ok-for-header"
#define CMD_PUSH             "%push"
#define CMD_POP              "%pop"
#define CMD_IF_REENTRANT     "%if-reentrant"
#define CMD_IF_NOT_REENTRANT "%if-not-reentrant"
#define CMD_IF_BISON_BRIDGE  "%if-bison-bridge"
#define CMD_IF_NOT_BISON_BRIDGE  "%if-not-bison-bridge"
#define CMD_ENDIF            "%endif"

/* we allow the skeleton to push and pop. */
struct sko_state {
    bool dc; /**< do_copy */
};
static struct sko_state *sko_stack=0;
static int sko_len=0,sko_sz=0;
static void sko_push(bool dc)
{
    if(!sko_stack){
        sko_sz = 1;
        sko_stack = (struct sko_state*)flex_alloc(sizeof(struct sko_state)*sko_sz);
        if (!sko_stack)
            flexfatal(_("allocation of sko_stack failed"));
        sko_len = 0;
    }
    if(sko_len >= sko_sz){
        sko_sz *= 2;
        sko_stack = (struct sko_state*)flex_realloc(sko_stack,sizeof(struct sko_state)*sko_sz);
    }
    
    /* initialize to zero and push */
    sko_stack[sko_len].dc = dc;
    sko_len++;
}
static void sko_peek(bool *dc)
{
    if(sko_len <= 0)
        flex_die("peek attempt when sko stack is empty");
    if(dc)
        *dc = sko_stack[sko_len-1].dc;
}
static void sko_pop(bool* dc)
{
    sko_peek(dc);
    sko_len--;
    if(sko_len < 0)
        flex_die("popped too many times in skeleton.");
}

/* Append "#define defname value\n" to the running buffer. */
void action_define (defname, value)
     const char *defname;
     int value;
{
	char    buf[MAXLINE];
	char   *cpy;

	if ((int) strlen (defname) > MAXLINE / 2) {
		format_pinpoint_message (_
					 ("name \"%s\" ridiculously long"),
					 defname);
		return;
	}

	snprintf (buf, sizeof(buf), "#define %s %d\n", defname, value);
	add_action (buf);

	/* track #defines so we can undef them when we're done. */
	cpy = copy_string (defname);
	buf_append (&defs_buf, &cpy, 1);
}


/** Append "m4_define([[defname]],[[value]])m4_dnl\n" to the running buffer.
 *  @param defname The macro name.
 *  @param value The macro value, can be NULL, which is the same as the empty string.
 */
void action_m4_define (const char *defname, const char * value)
{
	char    buf[MAXLINE];

    flexfatal ("DO NOT USE THIS FUNCTION!");

	if ((int) strlen (defname) > MAXLINE / 2) {
		format_pinpoint_message (_
					 ("name \"%s\" ridiculously long"),
					 defname);
		return;
	}

	snprintf (buf, sizeof(buf), "m4_define([[%s]],[[%s]])m4_dnl\n", defname, value?value:"");
	add_action (buf);
}

/* Append "new_text" to the running buffer. */
void add_action (new_text)
     const char   *new_text;
{
	int     len = strlen (new_text);

	while (len + action_index >= action_size - 10 /* slop */ ) {
		int     new_size = action_size * 2;

		if (new_size <= 0)
			/* Increase just a little, to try to avoid overflow
			 * on 16-bit machines.
			 */
			action_size += action_size / 8;
		else
			action_size = new_size;

		action_array =
			reallocate_character_array (action_array,
						    action_size);
	}

	strcpy (&action_array[action_index], new_text);

	action_index += len;
}


/* allocate_array - allocate memory for an integer array of the given size */

void   *allocate_array (size, element_size)
     int size;
     size_t element_size;
{
	void *mem;
	size_t  num_bytes = element_size * size;

	mem = flex_alloc (num_bytes);
	if (!mem)
		flexfatal (_
			   ("memory allocation failed in allocate_array()"));

	return mem;
}


/* all_lower - true if a string is all lower-case */

int all_lower (str)
     char *str;
{
	while (*str) {
		if (!isascii ((Char) * str) || !islower ((Char) * str))
			return 0;
		++str;
	}

	return 1;
}


/* all_upper - true if a string is all upper-case */

int all_upper (str)
     char *str;
{
	while (*str) {
		if (!isascii ((Char) * str) || !isupper ((Char) * str))
			return 0;
		++str;
	}

	return 1;
}


/* intcmp - compares two integers for use by qsort. */

int intcmp (const void *a, const void *b)
{
  return *(const int *) a - *(const int *) b;
}


/* check_char - checks a character to make sure it's within the range
 *		we're expecting.  If not, generates fatal error message
 *		and exits.
 */

void check_char (c)
     int c;
{
	if (c >= CSIZE)
		lerrsf (_("bad character '%s' detected in check_char()"),
			readable_form (c));

	if (c >= csize)
		lerrsf (_
			("scanner requires -8 flag to use the character %s"),
			readable_form (c));
}



/* clower - replace upper-case letter to lower-case */

Char clower (c)
     int c;
{
	return (Char) ((isascii (c) && isupper (c)) ? tolower (c) : c);
}


/* copy_string - returns a dynamically allocated copy of a string */

char   *copy_string (str)
     const char *str;
{
	const char *c1;
	char *c2;
	char   *copy;
	unsigned int size;

	/* find length */
	for (c1 = str; *c1; ++c1) ;

	size = (c1 - str + 1) * sizeof (char);

	copy = (char *) flex_alloc (size);

	if (copy == NULL)
		flexfatal (_("dynamic memory failure in copy_string()"));

	for (c2 = copy; (*c2++ = *str++) != 0;) ;

	return copy;
}


/* copy_unsigned_string -
 *    returns a dynamically allocated copy of a (potentially) unsigned string
 */

Char   *copy_unsigned_string (str)
     Char *str;
{
	Char *c;
	Char   *copy;

	/* find length */
	for (c = str; *c; ++c) ;

	copy = allocate_Character_array (c - str + 1);

	for (c = copy; (*c++ = *str++) != 0;) ;

	return copy;
}


/* cclcmp - compares two characters for use by qsort with '\0' sorting last. */

int cclcmp (const void *a, const void *b)
{
  if (!*(const Char *) a)
	return 1;
  else
	if (!*(const Char *) b)
	  return - 1;
	else
	  return *(const Char *) a - *(const Char *) b;
}


/* dataend - finish up a block of data declarations */

void dataend ()
{
	/* short circuit any output */
	if (gentables) {

		if (datapos > 0)
			dataflush ();

		/* add terminator for initialization; { for vi */
		outn ("    } ;\n");
	}
	dataline = 0;
	datapos = 0;
}


/* dataflush - flush generated data statements */

void dataflush ()
{
	/* short circuit any output */
	if (!gentables)
		return;

	outc ('\n');

	if (++dataline >= NUMDATALINES) {
		/* Put out a blank line so that the table is grouped into
		 * large blocks that enable the user to find elements easily.
		 */
		outc ('\n');
		dataline = 0;
	}

	/* Reset the number of characters written on the current line. */
	datapos = 0;
}


/* flexerror - report an error message and terminate */

void flexerror (msg)
     const char *msg;
{
	fprintf (stderr, "%s: %s\n", program_name, msg);
	flexend (1);
}


/* flexfatal - report a fatal error message and terminate */

void flexfatal (msg)
     const char *msg;
{
	fprintf (stderr, _("%s: fatal internal error, %s\n"),
		 program_name, msg);
	FLEX_EXIT (1);
}


/* htoi - convert a hexadecimal digit string to an integer value */

int htoi (str)
     Char str[];
{
	unsigned int result;

	(void) sscanf ((char *) str, "%x", &result);

	return result;
}


/* lerrif - report an error message formatted with one integer argument */

void lerrif (msg, arg)
     const char *msg;
     int arg;
{
	char    errmsg[MAXLINE];

	snprintf (errmsg, sizeof(errmsg), msg, arg);
	flexerror (errmsg);
}


/* lerrsf - report an error message formatted with one string argument */

void lerrsf (msg, arg)
	const char *msg, arg[];
{
	char    errmsg[MAXLINE];

	snprintf (errmsg, sizeof(errmsg)-1, msg, arg);
	errmsg[sizeof(errmsg)-1] = 0; /* ensure NULL termination */
	flexerror (errmsg);
}


/* lerrsf_fatal - as lerrsf, but call flexfatal */

void lerrsf_fatal (msg, arg)
	const char *msg, arg[];
{
	char    errmsg[MAXLINE];

	snprintf (errmsg, sizeof(errmsg)-1, msg, arg);
	errmsg[sizeof(errmsg)-1] = 0; /* ensure NULL termination */
	flexfatal (errmsg);
}


/* line_directive_out - spit out a "#line" statement */

void line_directive_out (output_file, do_infile)
     FILE   *output_file;
     int do_infile;
{
	char    directive[MAXLINE], filename[MAXLINE];
	char   *s1, *s2, *s3;
	static const char *line_fmt = "#line %d \"%s\"\n";

	if (!gen_line_dirs)
		return;

	s1 = do_infile ? infilename : "M4_YY_OUTFILE_NAME";

	if (do_infile && !s1)
        s1 = "<stdin>";
    
	s2 = filename;
	s3 = &filename[sizeof (filename) - 2];

	while (s2 < s3 && *s1) {
		if (*s1 == '\\')
			/* Escape the '\' */
			*s2++ = '\\';

		*s2++ = *s1++;
	}

	*s2 = '\0';

	if (do_infile)
		snprintf (directive, sizeof(directive), line_fmt, linenum, filename);
	else {
		snprintf (directive, sizeof(directive), line_fmt, 0, filename);
	}

	/* If output_file is nil then we should put the directive in
	 * the accumulated actions.
	 */
	if (output_file) {
		fputs (directive, output_file);
	}
	else
		add_action (directive);
}


/* mark_defs1 - mark the current position in the action array as
 *               representing where the user's section 1 definitions end
 *		 and the prolog begins
 */
void mark_defs1 ()
{
	defs1_offset = 0;
	action_array[action_index++] = '\0';
	action_offset = prolog_offset = action_index;
	action_array[action_index] = '\0';
}


/* mark_prolog - mark the current position in the action array as
 *               representing the end of the action prolog
 */
void mark_prolog ()
{
	action_array[action_index++] = '\0';
	action_offset = action_index;
	action_array[action_index] = '\0';
}


/* mk2data - generate a data statement for a two-dimensional array
 *
 * Generates a data statement initializing the current 2-D array to "value".
 */
void mk2data (value)
     int value;
{
	/* short circuit any output */
	if (!gentables)
		return;

	if (datapos >= NUMDATAITEMS) {
		outc (',');
		dataflush ();
	}

	if (datapos == 0)
		/* Indent. */
		out ("    ");

	else
		outc (',');

	++datapos;

	out_dec ("%5d", value);
}


/* mkdata - generate a data statement
 *
 * Generates a data statement initializing the current array element to
 * "value".
 */
void mkdata (value)
     int value;
{
	/* short circuit any output */
	if (!gentables)
		return;

	if (datapos >= NUMDATAITEMS) {
		outc (',');
		dataflush ();
	}

	if (datapos == 0)
		/* Indent. */
		out ("    ");
	else
		outc (',');

	++datapos;

	out_dec ("%5d", value);
}


/* myctoi - return the integer represented by a string of digits */

int myctoi (array)
     const char *array;
{
	int     val = 0;

	(void) sscanf (array, "%d", &val);

	return val;
}


/* myesc - return character corresponding to escape sequence */

Char myesc (array)
     Char array[];
{
	Char    c, esc_char;

	switch (array[1]) {
	case 'b':
		return '\b';
	case 'f':
		return '\f';
	case 'n':
		return '\n';
	case 'r':
		return '\r';
	case 't':
		return '\t';

#if defined (__STDC__)
	case 'a':
		return '\a';
	case 'v':
		return '\v';
#else
	case 'a':
		return '\007';
	case 'v':
		return '\013';
#endif

	case '0':
	case '1':
	case '2':
	case '3':
	case '4':
	case '5':
	case '6':
	case '7':
		{		/* \<octal> */
			int     sptr = 1;

			while (isascii (array[sptr]) &&
			       isdigit (array[sptr]))
				/* Don't increment inside loop control
				 * because if isdigit() is a macro it might
				 * expand into multiple increments ...
				 */
				++sptr;

			c = array[sptr];
			array[sptr] = '\0';

			esc_char = otoi (array + 1);

			array[sptr] = c;

			return esc_char;
		}

	case 'x':
		{		/* \x<hex> */
			int     sptr = 2;

			while (isascii (array[sptr]) &&
			       isxdigit (array[sptr]))
				/* Don't increment inside loop control
				 * because if isdigit() is a macro it might
				 * expand into multiple increments ...
				 */
				++sptr;

			c = array[sptr];
			array[sptr] = '\0';

			esc_char = htoi (array + 2);

			array[sptr] = c;

			return esc_char;
		}

	default:
		return array[1];
	}
}


/* otoi - convert an octal digit string to an integer value */

int otoi (str)
     Char str[];
{
	unsigned int result;

	(void) sscanf ((char *) str, "%o", &result);
	return result;
}


/* out - various flavors of outputing a (possibly formatted) string for the
 *	 generated scanner, keeping track of the line count.
 */

void out (str)
     const char *str;
{
	fputs (str, stdout);
}

void out_dec (fmt, n)
     const char *fmt;
     int n;
{
	fprintf (stdout, fmt, n);
}

void out_dec2 (fmt, n1, n2)
     const char *fmt;
     int n1, n2;
{
	fprintf (stdout, fmt, n1, n2);
}

void out_hex (fmt, x)
     const char *fmt;
     unsigned int x;
{
	fprintf (stdout, fmt, x);
}

void out_str (fmt, str)
     const char *fmt, str[];
{
	fprintf (stdout,fmt, str);
}

void out_str3 (fmt, s1, s2, s3)
     const char *fmt, s1[], s2[], s3[];
{
	fprintf (stdout,fmt, s1, s2, s3);
}

void out_str_dec (fmt, str, n)
     const char *fmt, str[];
     int n;
{
	fprintf (stdout,fmt, str, n);
}

void outc (c)
     int c;
{
	fputc (c, stdout);
}

void outn (str)
     const char *str;
{
	fputs (str,stdout);
    fputc('\n',stdout);
}

/** Print "m4_define( [[def]], [[val]])m4_dnl\n".
 * @param def The m4 symbol to define.
 * @param val The definition; may be NULL.
 * @return buf
 */
void out_m4_define (const char* def, const char* val)
{
    const char * fmt = "m4_define( [[%s]], [[%s]])m4_dnl\n";
    fprintf(stdout, fmt, def, val?val:"");
}


/* readable_form - return the the human-readable form of a character
 *
 * The returned string is in static storage.
 */

char   *readable_form (c)
     int c;
{
	static char rform[20];

	if ((c >= 0 && c < 32) || c >= 127) {
		switch (c) {
		case '\b':
			return "\\b";
		case '\f':
			return "\\f";
		case '\n':
			return "\\n";
		case '\r':
			return "\\r";
		case '\t':
			return "\\t";

#if defined (__STDC__)
		case '\a':
			return "\\a";
		case '\v':
			return "\\v";
#endif

		default:
			if(trace_hex)
				snprintf (rform, sizeof(rform), "\\x%.2x", (unsigned int) c);
			else
				snprintf (rform, sizeof(rform), "\\%.3o", (unsigned int) c);
			return rform;
		}
	}

	else if (c == ' ')
		return "' '";

	else {
		rform[0] = c;
		rform[1] = '\0';

		return rform;
	}
}


/* reallocate_array - increase the size of a dynamic array */

void   *reallocate_array (array, size, element_size)
     void   *array;
     int size;
     size_t element_size;
{
	void *new_array;
	size_t  num_bytes = element_size * size;

	new_array = flex_realloc (array, num_bytes);
	if (!new_array)
		flexfatal (_("attempt to increase array size failed"));

	return new_array;
}


/* skelout - write out one section of the skeleton file
 *
 * Description
 *    Copies skelfile or skel array to stdout until a line beginning with
 *    "%%" or EOF is found.
 */
void skelout ()
{
	char    buf_storage[MAXLINE];
	char   *buf = buf_storage;
	bool   do_copy = true;

    /* "reset" the state by clearing the buffer and pushing a '1' */
    if(sko_len > 0)
        sko_peek(&do_copy);
    sko_len = 0;
    sko_push(do_copy=true);


	/* Loop pulling lines either from the skelfile, if we're using
	 * one, or from the skel[] array.
	 */
	while (skelfile ?
	       (fgets (buf, MAXLINE, skelfile) != NULL) :
	       ((buf = (char *) skel[skel_ind++]) != 0)) {

		if (skelfile)
			chomp (buf);

		/* copy from skel array */
		if (buf[0] == '%') {	/* control line */
			/* print the control line as a comment. */
			if (ddebug && buf[1] != '#') {
				if (buf[strlen (buf) - 1] == '\\')
					out_str ("/* %s */\\\n", buf);
				else
					out_str ("/* %s */\n", buf);
			}

			/* We've been accused of using cryptic markers in the skel.
			 * So we'll use emacs-style-hyphenated-commands.
             * We might consider a hash if this if-else-if-else
             * chain gets too large.
			 */
#define cmd_match(s) (strncmp(buf,(s),strlen(s))==0)

			if (buf[1] == '%') {
				/* %% is a break point for skelout() */
				return;
			}
            else if (cmd_match (CMD_PUSH)){
                sko_push(do_copy);
                if(ddebug){
                    out_str("/*(state = (%s) */",do_copy?"true":"false");
                }
                out_str("%s\n", buf[strlen (buf) - 1] =='\\' ? "\\" : "");
            }
            else if (cmd_match (CMD_POP)){
                sko_pop(&do_copy);
                if(ddebug){
                    out_str("/*(state = (%s) */",do_copy?"true":"false");
                }
                out_str("%s\n", buf[strlen (buf) - 1] =='\\' ? "\\" : "");
            }
            else if (cmd_match (CMD_IF_REENTRANT)){
                sko_push(do_copy);
                do_copy = reentrant && do_copy;
            }
            else if (cmd_match (CMD_IF_NOT_REENTRANT)){
                sko_push(do_copy);
                do_copy = !reentrant && do_copy;
            }
            else if (cmd_match(CMD_IF_BISON_BRIDGE)){
                sko_push(do_copy);
                do_copy = bison_bridge_lval && do_copy;
            }
            else if (cmd_match(CMD_IF_NOT_BISON_BRIDGE)){
                sko_push(do_copy);
                do_copy = !bison_bridge_lval && do_copy;
            }
            else if (cmd_match (CMD_ENDIF)){
                sko_pop(&do_copy);
            }
			else if (cmd_match (CMD_IF_TABLES_SER)) {
                do_copy = do_copy && tablesext;
			}
			else if (cmd_match (CMD_TABLES_YYDMAP)) {
				if (tablesext && yydmap_buf.elts)
					outn ((char *) (yydmap_buf.elts));
			}
            else if (cmd_match (CMD_DEFINE_YYTABLES)) {
                out_str("#define YYTABLES_NAME \"%s\"\n",
                        tablesname?tablesname:"yytables");
            }
			else if (cmd_match (CMD_IF_CPP_ONLY)) {
				/* only for C++ */
                sko_push(do_copy);
				do_copy = C_plus_plus;
			}
			else if (cmd_match (CMD_IF_C_ONLY)) {
				/* %- only for C */
                sko_push(do_copy);
				do_copy = !C_plus_plus;
			}
			else if (cmd_match (CMD_IF_C_OR_CPP)) {
				/* %* for C and C++ */
                sko_push(do_copy);
				do_copy = true;
			}
			else if (cmd_match (CMD_NOT_FOR_HEADER)) {
				/* %c begin linkage-only (non-header) code. */
				OUT_BEGIN_CODE ();
			}
			else if (cmd_match (CMD_OK_FOR_HEADER)) {
				/* %e end linkage-only code. */
				OUT_END_CODE ();
			}
			else if (buf[1] == '#') {
				/* %# a comment in the skel. ignore. */
			}
			else {
				flexfatal (_("bad line in skeleton file"));
			}
		}

		else if (do_copy) 
            outn (buf);
	}			/* end while */
}


/* transition_struct_out - output a yy_trans_info structure
 *
 * outputs the yy_trans_info structure with the two elements, element_v and
 * element_n.  Formats the output with spaces and carriage returns.
 */

void transition_struct_out (element_v, element_n)
     int element_v, element_n;
{

	/* short circuit any output */
	if (!gentables)
		return;

	out_dec2 (" {%4d,%4d },", element_v, element_n);

	datapos += TRANS_STRUCT_PRINT_LENGTH;

	if (datapos >= 79 - TRANS_STRUCT_PRINT_LENGTH) {
		outc ('\n');

		if (++dataline % 10 == 0)
			outc ('\n');

		datapos = 0;
	}
}


/* The following is only needed when building flex's parser using certain
 * broken versions of bison.
 */
void   *yy_flex_xmalloc (size)
     int size;
{
	void   *result = flex_alloc ((size_t) size);

	if (!result)
		flexfatal (_
			   ("memory allocation failed in yy_flex_xmalloc()"));

	return result;
}


/* zero_out - set a region of memory to 0
 *
 * Sets region_ptr[0] through region_ptr[size_in_bytes - 1] to zero.
 */

void zero_out (region_ptr, size_in_bytes)
     char   *region_ptr;
     size_t size_in_bytes;
{
	char *rp, *rp_end;

	rp = region_ptr;
	rp_end = region_ptr + size_in_bytes;

	while (rp < rp_end)
		*rp++ = 0;
}

/* Remove all '\n' and '\r' characters, if any, from the end of str.
 * str can be any null-terminated string, or NULL.
 * returns str. */
char   *chomp (str)
     char   *str;
{
	char   *p = str;

	if (!str || !*str)	/* s is null or empty string */
		return str;

	/* find end of string minus one */
	while (*p)
		++p;
	--p;

	/* eat newlines */
	while (p >= str && (*p == '\r' || *p == '\n'))
		*p-- = 0;
	return str;
}