File: xspara.c

package info (click to toggle)
texinfo 6.5.0.dfsg.1-4
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 85,304 kB
  • sloc: perl: 905,694; ansic: 53,356; sh: 17,766; xml: 5,697; awk: 1,844; makefile: 1,467; lisp: 213; pascal: 127; sed: 78
file content (1197 lines) | stat: -rw-r--r-- 34,646 bytes parent folder | download
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
/* Copyright 2010, 2011, 2012, 2013, 2014, 2015, 2016 Free Software
   Foundation, Inc.

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

#ifdef HAVE_CONFIG_H
  #include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <locale.h>
#ifndef _WIN32
#include <langinfo.h>
#else  /* _WIN32 */
/* Workaround for problems caused in mingw.org's MinGW build by
   Gnulib's wchar.h overriding the wint_t type definition, which
   causes compilation errors when perl.h is included below, because
   perl.h includes ctype.h.  */
#include <ctype.h>
#endif
#include <wchar.h>
#include <wctype.h>

/* See "How do I use all this in extensions" in 'man perlguts'. */
#define PERL_NO_GET_CONTEXT

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include "ppport.h"

#include "xspara.h"

#include "text.h"

typedef struct {
    TEXT space; /* Pending space, to be output before the pending word. */
    TEXT word; /* Pending word.  If outputting this would have led to
                  the line to be too long, the line should have been cut before
                  saving it. */

    /* When word.end == 0, this indicates a word of length 0. */
    int invisible_pending_word;

    /* Length of space in multibyte characters. */
    int space_counter;

    /* Characters added so far in current word. */
    int word_counter; 

    /* -2 means we are not at the end of a sentence (undefined in Perl),
       1 means we are at the end of a sentence and French spacing is off,
       -1 means we are at the end of a sentence and French spacing is on.
       0 means it is "inhibited". */
    int end_sentence;

    int max; /* Maximum length of line. */
    int indent_length; /* Columns to indent this line. */
    int indent_length_next; /* Columns to indent the rest of the lines. */
    int counter; /* Columns so far on this line. */

    int lines_counter; /* Lines so far added in paragraph. */
    int end_line_count; /* Number of newlines so far in an output unit, i.e.
                           with add_text or add_next. */

    wint_t last_letter; /* Last letter in word, used to decide if we're
                            at the end of a sentence. */

    /* Options set with set_space_protection. */
    int protect_spaces; /* Line break forbidden, as in @w. */
    int ignore_columns; /* Don't cut line at right margin.  Used by
                           @flushleft and @flushright. */
    int keep_end_lines; /* A newline in the input ends a line in the output.
                           Used by @flushleft and @flushright. */
    int french_spacing; /* Only one space, not two, after a full stop. */
    int double_width_no_break; /* No line break between double width chars. */

    /* No wrapping of lines and spaces are kept as-is. */
    int unfilled;

    /* Do not terminate with a final newline. */
    int no_final_newline;

    /* Terminate with any trailing space. */
    int add_final_space;

    int in_use;
} PARAGRAPH;

static PARAGRAPH state;

#ifdef _WIN32

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <errno.h>

/* If Gnulib overrides wint_t with a wider type, we cannot use
   iswspace etc. names, whose prototypes were seen with the original
   wint_t in effect.  */
#ifdef GNULIB_defined_wint_t
# undef iswspace
# define iswspace(w) w32_iswspace(w)
# undef iswupper
# define iswupper(w) w32_iswupper(w)
#endif

char *
w32_setlocale (int category, const char *value)
{
  if (_stricmp (value, "en_us.utf-8") != 0)
    return NULL;

  /* Switch to the Windows U.S. English locale with its default
     codeset.  We will handle the non-ASCII text ourselves, so the
     codeset is unimportant, and Windows doesn't support UTF-8 as the
     codeset anyway.  */
  return setlocale (category, "ENU");
}
#define setlocale(c,v)  w32_setlocale(c,v)

size_t
mbrlen (const char * __restrict__ mbs, size_t n, mbstate_t * __restrict__ ps)
{
  unsigned char byte1 = *mbs;

  if (ps != NULL)
    {
      errno = ENOSYS;
      return -1;
    }

  return
    ((byte1 & 0x80) == 0) ? 1 : ((byte1 & 0x20) == 0) ? 2 :
    ((byte1 & 0x10) == 0) ? 3 : 4;
}

/* Convert a UTF-8 encoded multibyte string to a wide character.  */
size_t
mbrtowc (wchar_t * __restrict__ pwc, const char * __restrict__ mbs, size_t n,
	 mbstate_t * __restrict__ ps)
{
  int len = mbrlen (mbs, n, ps);

  if (mbs == NULL)
    return 0;
  else
    {
      wchar_t wc[2];
      size_t n_utf16 = MultiByteToWideChar (CP_UTF8, MB_ERR_INVALID_CHARS,
					    mbs, len, wc, 2);
      if (n_utf16 == 0)
	{
	  errno = EILSEQ;
	  return (size_t)-1;
	}
      if (ps != NULL)
	{
	  errno = ENOSYS;
	  return (size_t)-1;
	}
      /* We don't support UTF-16 surrogates, because the calling code
	 doesn't, and because character classification functions on
	 Windows don't support anything beyond the BMP anyway.  So we
	 return the first character of the surrogate pair and set
	 errno.  */
      if (n_utf16 > 1)
	errno = ENOSYS;
      if (pwc != NULL)
	*pwc = wc[0];

      return len;
    }
}

int
iswspace (wint_t wc)
{
  /* See Unicode's Proplist.txt.  */
  if ((wc >= 0x09 && wc <= 0x0D)
      || wc == 0x20
      || wc == 0x85
      || wc == 0xA0
      || wc == 0x1680
      || (wc >= 0x2000 && wc <= 0x200A)
      || wc == 0x2028
      || wc == 0x2029
      || wc == 0x202F
      || wc == 0x205F
      || wc == 0x3000)
    return 1;

  return 0;
}

/* FIXME: Provide a real implementation.  */
int
wcwidth (const wchar_t wc)
{
  return wc == 0 ? 0 : 1;
}

int
iswupper (wint_t wi)
{
  WORD char_type;
  wchar_t wc = wi;
  BOOL status = GetStringTypeW (CT_CTYPE1, &wc, 1, &char_type);

  if (!status || (char_type & C1_UPPER) == 0)
    return 0;

  return 1;
}

/* Avoid warnings due to redefinition of popen/pclose in Perl headers.  */
#ifdef popen
# undef popen
# define popen(c,m) _popen(c,m)
#endif
#ifdef pclose
# undef pclose
# define pclose(f)  _pclose(f)
#endif

#endif

int
xspara_init (void)
{
  char *utf8_locale = 0;
  int len;
  char *cur;
  char *dot;

  dTHX;

#if PERL_VERSION > 27 || (PERL_VERSION == 27 && PERL_SUBVERSION > 8)
  /* needed due to thread-safe locale handling in newer perls */
  switch_to_global_locale();
#endif

  if (setlocale (LC_CTYPE, "en_US.UTF-8")
      || setlocale (LC_CTYPE, "en_US.utf8"))
    goto success;

  cur = setlocale (LC_CTYPE, 0); /* Name of current locale. */
  if (!cur)
    goto failure;
  len = strlen (cur);
  if (len >= 6 && !memcmp (".UTF-8", cur + len - 6, 6)
      || len >= 5 && !memcmp (".utf8", cur + len - 5, 5)
      || len >= 6 && !memcmp (".utf-8", cur + len - 6, 6)
      || len >= 5 && !memcmp (".UTF8", cur + len - 5, 5))
    {
      setlocale (LC_CTYPE, ""); /* Use the locale from the environment. */
      goto success;
    }

  /* Otherwise try altering the current locale name. */
  dot = strchr (cur, '.');
  if (!dot)
    dot = cur + len;
  utf8_locale = malloc (len + 6 + 1); /* enough to add ".UTF-8" to end */
  memcpy (utf8_locale, cur, dot - cur);
  dot = utf8_locale + (dot - cur);
  memcpy (dot, ".UTF-8", 7);
  if (setlocale (LC_CTYPE, utf8_locale))
    goto success;

  memcpy (dot, ".utf8", 6);
  if (setlocale (LC_CTYPE, utf8_locale))
    goto success;

  /* Otherwise, look for any UTF-8 locale in the output of "locale -a". */
  {
  FILE *p;
  char *line = 0;
  size_t n = 0;
  ssize_t ret;
  p = popen ("locale -a", "r");
  if (!p)
    goto failure;
  while (1)
    {
      ret = getline (&line, &n, p);
      if (ret == (ssize_t) -1)
        {
          free (line);
          pclose (p);
          goto failure;
        }
      if (strstr (line, "UTF-8") || strstr (line, "utf8"))
        {
          line[ret - 1] = '\0';   /* Remove trailing newline. */
          if (setlocale (LC_CTYPE, line))
            {
              free (line);
              pclose (p);
              goto success;
            }
        }
    }
  }
      
  if (1)
    {
failure:
      return 0; /* failure */
    }
  else
    {
success: ;
      free (utf8_locale);
#if PERL_VERSION > 27 || (PERL_VERSION == 27 && PERL_SUBVERSION > 8)
      /* needed due to thread-safe locale handling in newer perls */
      sync_locale();
#endif
      /*
      fprintf (stderr, "tried to set LC_CTYPE to UTF-8.\n");
      fprintf (stderr, "character encoding is: %s\n",
               nl_langinfo (CODESET));
       */
      return 1; /* success */
    }
}

/* Array for storing paragraph states which aren't in use. */
static PARAGRAPH *state_array;
static int state_array_size;

/* The slot in state_array for saving the current state. */
static int current_state;

static void
xspara__switch_state (int id)
{
  if (current_state == id)
    return;
  if (current_state != -1)
    memcpy (&state_array[current_state], &state, sizeof (PARAGRAPH));

  memcpy (&state, &state_array[id], sizeof (PARAGRAPH));
  current_state = id;
}

int
xspara_new (HV *conf)
{
  int i;

  dTHX; /* Perl boiler plate */

  TEXT saved_space, saved_word;

  /* Find an unused slot in state_array */
  for (i = 0; i < state_array_size; i++)
    {
      if (!state_array[i].in_use)
        break;
    }
  if (i == state_array_size)
    {
      state_array = realloc (state_array,
                             (state_array_size += 10) * sizeof (PARAGRAPH));
      memset (state_array + i, 0, 10 * sizeof (PARAGRAPH));
    }

  state_array[i].in_use = 1;
  xspara__switch_state (i);

  /* Zero formatter, reusing storage. */
  saved_space = state.space;
  saved_word = state.word;
  memset (&state, 0, sizeof (state));
  state.space = saved_space;
  state.word = saved_word;
  state.space.end = state.word.end = 0;
  state.in_use = 1;

  /* Default values. */
  state.max = 72;
  state.indent_length_next = -1; /* Special value meaning undefined. */
  state.end_sentence = -2; /* Special value meaning undefined. */
  state.last_letter = L'\0';

  if (conf)
    xspara_init_state (conf);

  /* The paragraph ID. */
  return i;
}


/* SV is a blessed reference to an integer containing the paragraph ID. */
void
xspara_set_state (SV *sv)
{
  dTHX;

  xspara__switch_state (SvIV (sv));
}

/* Set the state internal to this C module from the Perl hash. */
void
xspara_init_state (HV *hash)
{
#define FETCH(key) hv_fetch (hash, key, strlen (key), 0)
#define FETCH_INT(key,where) { val = FETCH(key); \
                               if (val) { where = SvIV (*val); } }

  SV **val;
  
  dTHX; /* This is boilerplate for interacting with Perl. */

  /* Fetch all these so they are set, and reset for each paragraph. */
  FETCH_INT("end_sentence", state.end_sentence);
  FETCH_INT("max", state.max);

  FETCH_INT("indent_length", state.indent_length);
  FETCH_INT("indent_length_next", state.indent_length_next);
  FETCH_INT("counter", state.counter); 

  FETCH_INT("word_counter", state.word_counter);

  FETCH_INT("lines_counter", state.lines_counter);
  FETCH_INT("end_line_count", state.end_line_count);

  FETCH_INT("protect_spaces", state.protect_spaces);
  FETCH_INT("ignore_columns", state.ignore_columns);
  FETCH_INT("keep_end_lines", state.keep_end_lines);
  FETCH_INT("frenchspacing", state.french_spacing);

  FETCH_INT("unfilled", state.unfilled);
  FETCH_INT("no_final_newline", state.no_final_newline);
  FETCH_INT("add_final_space", state.add_final_space);

  val = FETCH("word");
  if (val)
    {
      fprintf (stderr, "Bug: setting 'word' is not supported.\n");
      abort ();
    }
  val = FETCH("space");
  if (val)
    {
      fprintf (stderr, "Bug: setting 'space' is not supported.\n");
      abort ();
    }
  return;

#undef FETCH
#undef FETCH_INT
}

/* Move the state back into the Perl hash. */
void
xspara_get_state (HV *hash)
{
  /* TODO: The last argument of hv_store would be a precomputed hash, which
     would save the time of calculating it. */
#define STORE(key) hv_store (hash, key, strlen (key), val, 0)

  SV *val;

  /* Don't do anything. */
  return;

  dTHX; /* Perl boilerplate. */

  val = newSViv (state.end_sentence);
  STORE("end_sentence");

  val = newSViv (state.counter);
  STORE("counter");

  val = newSViv (state.word_counter);
  STORE("word_counter");

  val = newSViv (state.lines_counter);
  STORE("lines_counter");

  return;


#undef STORE
}


/************************************************************************/


/* Append a newline character to RESULT. */
void
xspara__cut_line (TEXT *result)
{
  if (!state.ignore_columns)
    {
      xspara__end_line ();

      text_append (result, "\n");
    }
}

int
xspara_end_line_count (void)
{
  return state.end_line_count;
}

/* End a line (throwing away a pending space, which we don't need)
   Note _end_line in Paragraph.pm returned "\n". */
void
xspara__end_line (void)
{
  state.counter = 0;
  state.space.end = 0;
  state.space_counter = 0;

  /* This will only be true for the first line of output. */
  if (state.indent_length_next != -1)
    {
      state.indent_length = state.indent_length_next;
      state.indent_length_next = -1;
    }

  state.lines_counter++;
  state.end_line_count++;
}

char *
xspara_end_line (void)
{
  state.end_line_count = 0;
  xspara__end_line ();
  return "\n";
}

/* Return concatenation of SPACE and WORD. */
char *
xspara_get_pending (void)
{
  TEXT t;
  text_init (&t);
  text_append_n (&t, state.space.text, state.space.end);
  text_append_n (&t, state.word.text, state.word.end);
  return t.text;
}

/* Append to RESULT pending space followed by pending word, clearing them 
   afterwards.  Assume we don't need to wrap a line.  Only add spaces without a 
   word if ADD_SPACES. */
void
xspara__add_pending_word (TEXT *result, int add_spaces)
{
  if (state.word.end == 0 && !state.invisible_pending_word && !add_spaces)
    return;

  if (state.indent_length > state.counter)
    {
      int i;
      /* If we are not up to the left margin yet, output spaces to get there, 
         and ignore 'state.space', the pending space string.  In this case 
         state.counter is probably 0.  */

      for (i = 0; i < state.indent_length - state.counter; i++)
        text_append (result, " ");
      state.counter = state.indent_length;

      /* Do not output leading spaces after the indent, unless 'unfilled'
         is on.  */
      if (!state.unfilled)
        state.space.end = 0;
    }

  if (state.space.end > 0)
    {
      text_append_n (result, state.space.text, state.space.end);

      state.counter += state.space_counter;
      state.space.end = 0;
      state.space_counter = 0;
    }

  if (state.word.end > 0 || state.invisible_pending_word)
    {
      text_append_n (result, state.word.text, state.word.end);
      state.counter += state.word_counter;

      state.word.end = 0;
      state.word_counter = 0;
      state.invisible_pending_word = 0;
    }
}

/* Function for users of this module. */
char *
xspara_add_pending_word (int add_spaces)
{
  TEXT ret;

  text_init (&ret);
  state.end_line_count = 0;
  xspara__add_pending_word (&ret, add_spaces);
  if (ret.text)
    return ret.text;
  else
    return "";
}

/* End a paragraph. */
char *
xspara_end (void)
{
  TEXT ret;
  text_init (&ret);
  state.end_line_count = 0;
  xspara__add_pending_word (&ret, state.add_final_space);
  if (!state.no_final_newline && state.counter != 0)
    {
      text_append (&ret, "\n");
      state.lines_counter++;
      state.end_line_count++;
    }

  /* Now it's time to forget about the state. */
  state_array[current_state].in_use = 0;
  state.in_use = 0;

  /* Don't do this so we can get the closing line counts. */
  /* current_state = -1; */

  if (ret.text)
    return ret.text;
  else
    return "";
}

/* Add WORD to paragraph in RESULT, not refilling WORD.  If we go past the end 
   of the line start a new one.  TRANSPARENT means that the letters in WORD
   are ignored for the purpose of deciding whether a full stop ends a sentence
   or not. */
void
xspara__add_next (TEXT *result, char *word, int word_len, int transparent)
{
  int disinhibit = 0;
  if (!word)
    return;

  if (word_len >= 1 && word[word_len - 1] == '\b')
    {
      word[--word_len] = '\0';
      disinhibit = 1;
    }

  if (state.word.end == 0 && !state.invisible_pending_word)
    {
      /* Check if we are at the end of a sentence and if we need to
         output two spaces after the full stop.  If so, check if the
         word we are given begins with whitespace.  If it doesn't,
         double the pending space.

         We checked above if there was a pending word because if there
         was, it is due to be output after the end-sentence whitespace,
         not the string that was passed as an argument to this function.  
       */
      state.last_letter = L'\0';

      if (state.counter != 0 && state.space.end > 0
          && state.end_sentence == 1 && !state.french_spacing)
        {
          wchar_t wc;
          size_t char_len;

          char_len = mbrtowc (&wc, word, word_len, NULL);
          if ((long) char_len > 0 && !iswspace (wc))
            {
              /* Make the pending space up to two spaces. */
              while (state.space_counter < 2)
                {
                  text_append_n (&state.space, " ", 1);
                  state.space_counter++;
                }
            }

          state.end_sentence = -2;
        }
    }

  text_append_n (&state.word, word, word_len);
  if (word_len == 0 && word)
    state.invisible_pending_word = 1;

  if (!transparent)
    {
      if (disinhibit)
        state.last_letter = L'a'; /* a lower-case letter */
      else
        {
          /* Save last character in WORD */
          char *p = word + word_len;
          int len = 0;
          while (p > word)
            {
              p--; len++;
              if ((long) mbrlen(p, len, NULL) > 0)
                {
                  wchar_t wc = L'\0';
                  mbrtowc (&wc, p, len, NULL);
                  if (!wcschr (L".?!\"')]", wc))
                    {
                      state.last_letter = wc;
                      break;
                    }
                }
            }

        }
    }

  if (strchr (word, '\n'))
    {
      /* If there was a newline in the word we just added, put the entire
         pending ouput in the results string, and start a new line. */
      xspara__add_pending_word (result, 0);
      xspara__end_line ();
    }
  else
    {
      /* The possibility of two-column characters is ignored here. */

      /* Calculate length of multibyte string in characters. */
      int len = 0;
      int left = word_len;
      wchar_t w;
      char *p = word;

      while (left > 0)
        {
          int char_len = mbrtowc (&w, p, left, NULL);
          left -= char_len;
          p += char_len;
          len++;
        }

      state.word_counter += len;
    }

  /* TODO: Shift this into the "else" clause above, because 
     xspara__end_line would have set state.counter to 0. */
  if (state.counter != 0
      && state.counter + state.word_counter + state.space_counter
          > state.max)
    {
      xspara__cut_line (result);
    }
}

/* Like _add_next but zero end_line_count at beginning. */
char *
xspara_add_next (char *text, int text_len, int transparent)
{
  TEXT t;

  text_init (&t);
  state.end_line_count = 0;
  xspara__add_next (&t, text, text_len, transparent);

  if (t.space > 0)
    return t.text;
  else
    return "";
}

void
xspara_remove_end_sentence (void)
{
  state.end_sentence = 0;
}

void
xspara_add_end_sentence (int value)
{
  state.end_sentence = value;
}

void
xspara_allow_end_sentence (void)
{
  state.last_letter = L'a'; /* A lower-case letter. */
}

/* -1 in a parameter means leave that value as it is. */
char *
xspara_set_space_protection (int protect_spaces,
                             int ignore_columns,
                             int keep_end_lines,
                             int french_spacing,
                             int double_width_no_break)
{
  if (protect_spaces != -1)
    state.protect_spaces = protect_spaces;
  if (ignore_columns != -1)
    state.ignore_columns = ignore_columns;
  if (keep_end_lines != -1)
    state.keep_end_lines = keep_end_lines;
  if (double_width_no_break != -1)
    state.double_width_no_break = double_width_no_break;

  /*fprintf (stderr, "SETTING SPACE (%d, %d, %d, %d)\n",
                                   protect_spaces,
                                   ignore_columns,
                                   keep_end_lines,
                                   french_spacing);*/

  /* If at the end of a sentence, and due to output the end of sentence
     space, and we switch to French spacing, then make the space up to
     two spaces.

     FIXME: This seems back-to-front: We want two spaces if we switch FROM
     French spacing. */

  if (state.french_spacing == 0
      && french_spacing != -1 && french_spacing != 0
      && state.end_sentence != -2 && state.end_sentence != 0
      && state.counter != 0
      && state.space.end > 0
      && state.word.end == 0 && !state.invisible_pending_word)
    {
      while (state.space_counter < 2)
        {
          text_append_n (&state.space, " ", 1);
          state.space_counter++;
        }

      /* End of sentence done. */
      state.end_sentence = -2;
    }

  if (french_spacing != -1)
    {
      state.french_spacing = french_spacing;
    }

 if (protect_spaces != -1 && state.protect_spaces)
   {
     if (state.word.end == 0)
       {
         /* In _add_pending_word this meant that an "empty word" would
            be output.  This makes "a @w{} b" -> "a  b", not "a b", and
            "a @w{}" at end of paragraph -> "a ", not "a". */

         state.invisible_pending_word = 1;
       }
   }

 return ""; /* TODO: Check if we can remove this. */
}

/*****************************************************************/


/* Return string to be added to paragraph contents, wrapping text. This 
   function relies on there being a UTF-8 locale in LC_CTYPE for mbrtowc to
   work correctly. */
char *
xspara_add_text (char *text)
{
  char *p = text;
  int len;
  wchar_t wc;
  size_t char_len;
  TEXT result;
  dTHX;

  text_init (&result);

  len = strlen (text); /* FIXME: Get this as an argument */
  state.end_line_count = 0;

  while (len > 0)
    {
      char_len = mbrtowc (&wc, p, len, NULL);
      if ((long) char_len == 0)
        break; /* Null character. Shouldn't happen. */
      else if ((long) char_len < 0)
        {
          p++; len--; /* Invalid.  Just try to keep going. */
          continue;
        }

      /* 00A0 and 202F are non-breaking spaces in Unicode. */
      if (iswspace (wc) && wc != L'\x00a0' && wc != L'\x202f')
        {
          state.last_letter = L'\0';

          /* If protect_spaces is on, ... */
          if (state.protect_spaces)
            {
              /* Append the spaces to the pending word. */
              text_append_n (&state.word, p, char_len);
              state.word_counter++;

              if (strchr (state.word.text, '\n'))
                {
                  /* Replace any '\n' with a ' '. Note that state.word_counter 
                     will still be correct after this. */
                  char *ptr = state.word.text;
                  while (*ptr)
                    {
                      if (*ptr == '\n')
                        *ptr = ' ';
                      ptr++;
                    }
                }

              if (state.counter != 0
                  && state.counter + state.word_counter + state.space_counter
                     > state.max)
                {
                  xspara__cut_line (&result);
                }
            }
          else /* protect_spaces off */
            {
              int pending = state.invisible_pending_word;
              xspara__add_pending_word (&result, 0);

              if (state.counter != 0 || state.unfilled || pending)
                {
                  /* If we are at the end of a sentence where two spaces
                     are required. */
                  if (state.end_sentence == 1
                      && !state.french_spacing
                      && !state.unfilled)
                    {
                      wchar_t q_char;
                      size_t q_len;
                      int at_least_two = 0;

                      /* Check if the next character is whitespace as well. */
                      q_len = mbrtowc (&q_char,
                                       p + char_len, len - char_len,
                                       NULL);
                      if ((long) q_len > 0)
                        {
                          if (iswspace (q_char))
                            at_least_two = 1;
                        }

                      /* If we have an existing pending space, or if we have
                         at least two whitespace characters in a row, set the
                         pending space to be two whitespace characters.

                         I don't know why we do it this way. */
                      if (state.space_counter >= 1 || at_least_two)
                        {
                          if (state.space_counter > 0)
                            {
                              /* Truncate to at most 2 spaces, and replace any 
                                 '\n' or '\r' characters with ' '. */

                              TEXT new_space;
                              char *pspace;
                              int pspace_left;
                              int len;
                              int i;

                              text_init (&new_space);
                              pspace = state.space.text;
                              pspace_left = state.space.end;
                              state.space_counter = 0;

                              for (i = 0; i < 2; i++)
                                {
                                  if (!*pspace)
                                    break;
                                  len = mbrlen (pspace, pspace_left, NULL);

                                  /* Substitute newlines in the pending space
                                     with spaces. */
                                  if (*pspace == '\n' || *pspace == '\r')
                                    text_append_n (&new_space, " ", 1);
                                  else if (len > 0)
                                    text_append_n (&new_space, pspace, len);
                                  else
                                    /* Skip one character and try again. */
                                    len = 1;

                                  state.space_counter++;

                                  pspace += len;
                                  pspace_left -= len;
                                }

                              state.space.end = 0;
                              text_append_n (&state.space,
                                             new_space.text, new_space.end);
                              text_destroy (&new_space);
                            }

                          /* Now get characters from the input. */
                          while (state.space_counter < 2)
                            {
                              if (*p == '\n' || *p == '\r')
                                text_append_n (&state.space, " ", 1);
                              else
                                text_append_n (&state.space, p, char_len);
                              state.space_counter++;

                              p += char_len; len -= char_len;
                              char_len = mbrtowc (&wc, p, len, NULL);
                              if ((long) char_len <= 0 || !iswspace (wc))
                                break;
                            }

                          /* Skip any more following whitespace. */
                          while ((long) char_len > 0 && iswspace (wc))
                            {
                              p += char_len; len -= char_len;
                              char_len = mbrtowc (&wc, p, len, NULL);
                            }

                          /* Make it up to two characters. */
                          while (state.space_counter < 2)
                            {
                              text_append_n (&state.space, " ", 1);
                              state.space_counter++;
                            }

                          /* Reset the end_sentence flag. */
                          state.end_sentence = -2;
                          continue;
                        }
                      else
                        {
                          /* Otherwise, an extra space is added
                             in _add_next. */
                          state.space.end = 0;
                          state.space_counter = 0;
                          if (*p == '\n' || *p == '\r')
                            text_append_n (&state.space, " ", 1);
                          else
                            text_append_n (&state.space, p, char_len);
                          state.space_counter++;
                        }

                    }
                  else /* Not at end of sentence. */
                    {
                      /* Only save the first space. */
                      if (state.unfilled || state.space_counter < 1)
                        {
                          if (*p == '\n' || *p == '\r')
                            {
                              if (!state.unfilled)
                                {
                                  text_append_n (&state.space, " ", 1);
                                  state.space_counter++;
                                }
                              else if (*p == '\n')
                                {
                                  xspara__add_pending_word (&result, 0);
                                  xspara__end_line ();
                                  text_append (&result, "\n");
                                }
                            }
                          else
                            {
                              text_append_n (&state.space, p, char_len);
                              state.space_counter++;
                            }
                        }
                    }
                }
            }

          /* If not enough space in the line for the pending space, start
             a new line. */
          if (state.counter + state.space_counter > state.max)
            {
              xspara__cut_line (&result);
            }

          if (!state.unfilled && *p == '\n' && state.keep_end_lines)
            {
              xspara__end_line ();
              text_append (&result, "\n");
            }
        }
      else /************** Not a white space character. *****************/
        {
          int width = wcwidth (wc);
          /*************** Double width character. *********************/
          if (width == 2)
            {
              state.last_letter = L'\0';

              /* We allow a line break in between Chinese characters even if 
                 there was no space between them, unlike single-width 
                 characters. */

              /* Append wc to state.word. */
              text_append_n (&state.word, p, char_len);

              state.word_counter += 2;

              if (state.counter != 0
                  && state.counter + state.word_counter > state.max)
                {
                  xspara__cut_line (&result);
                }
              /* If protect_spaces is on, accumulate the characters so that
                 they can be pushed onto the next line if necessary. */
              if (!state.protect_spaces && !state.double_width_no_break)
                {
                  xspara__add_pending_word (&result, 0);
                  state.end_sentence = -2;
                }
            }
          /*************** Word character ******************************/
          else if (width == 1)
            {
              char *added_word;
              added_word = malloc (char_len + 1);
              memcpy (added_word, p, char_len);
              added_word[char_len] = '\0';

              xspara__add_next (&result, added_word, char_len, 0);
              free (added_word);

              /* Now check if it is considered as an end of sentence, and
                 set state.end_sentence if it is. */

              if (strchr (".?!", *p) && !state.unfilled)
                {
                  /* Doesn't count if preceded by an upper-case letter. */
                  if (!iswupper (state.last_letter))
                    {
                      if (state.french_spacing)
                        state.end_sentence = -1;
                      else
                        state.end_sentence = 1;
                    }
                }
              else if (strchr ("\"')]", *p))
                {
                  /* '"', '\'', ']' and ')' are ignored for the purpose
                   of deciding whether a full stop ends a sentence. */
                }
              else
                {
                  /* Otherwise reset the end of sentence marker: a full stop in 
                     a string like "aaaa.bbbb" doesn't mark an end of 
                     sentence. */
                  state.end_sentence = -2;
                  state.last_letter = wc;
                }
            }
          else if (wc == L'\b')
            {
              /* Code to say that a following full stop (or question or
                 exclamation mark) may be an end of sentence. */
              xspara_allow_end_sentence ();
            }
          else
            {
              /* Not printable, possibly a tab, or a combining character.
                 Add it to the pending word without increasing the column 
                 count. */
              text_append_n (&state.word, p, char_len);
            }
        }

      p += char_len; len -= char_len;
    }

  if (result.space > 0)
    return result.text;
  else
    return "";
}