about summary refs log tree commit diff
path: root/stdio-common/vfscanf.c
blob: bad37f2ad1640182774ce5e8f34f2a724d188588 (plain) (blame)
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
/* Copyright (C) 1991,92,93,94,95,96,97,98 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

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

   The GNU C Library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <errno.h>
#include <limits.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wctype.h>
#include <bits/libc-lock.h>
#include <locale/localeinfo.h>

#ifdef	__GNUC__
# define HAVE_LONGLONG
# define LONGLONG	long long
#else
# define LONGLONG	long
#endif

/* Those are flags in the conversion format. */
# define LONG		0x001	/* l: long or double */
# define LONGDBL	0x002	/* L: long long or long double */
# define SHORT		0x004	/* h: short */
# define SUPPRESS	0x008	/* *: suppress assignment */
# define POINTER	0x010	/* weird %p pointer (`fake hex') */
# define NOSKIP		0x020	/* do not skip blanks */
# define WIDTH		0x040	/* width was given */
# define GROUP		0x080	/* ': group numbers */
# define MALLOC		0x100	/* a: malloc strings */
# define CHAR		0x200	/* hh: char */

# define TYPEMOD	(LONG|LONGDBL|SHORT|CHAR)


#ifdef USE_IN_LIBIO
# include <libioP.h>
# include <libio.h>

# undef va_list
# define va_list	_IO_va_list
# define ungetc(c, s)	((void) ((int) c != EOF && --read_in),		      \
			 _IO_ungetc (c, s))
# define inchar()	(c == EOF ? EOF					      \
			 : ((c = _IO_getc_unlocked (s)),		      \
			    (void) (c != EOF && ++read_in), c))
# define encode_error()	do {						      \
			  if (errp != NULL) *errp |= 4;			      \
			  _IO_funlockfile (s);				      \
			  __set_errno (EILSEQ);				      \
			  return done;					      \
			} while (0)
# define conv_error()	do {						      \
			  if (errp != NULL) *errp |= 2;			      \
			  _IO_funlockfile (s);				      \
			  return done;					      \
			} while (0)
# define input_error()	do {						      \
			  _IO_funlockfile (s);				      \
			  if (errp != NULL) *errp |= 1;			      \
			  return done ?: EOF;				      \
			} while (0)
# define memory_error()	do {						      \
			  _IO_funlockfile (s);				      \
			  __set_errno (ENOMEM);				      \
			  return EOF;					      \
			} while (0)
# define ARGCHECK(s, format)						      \
  do									      \
    {									      \
      /* Check file argument for consistence.  */			      \
      CHECK_FILE (s, EOF);						      \
      if (s->_flags & _IO_NO_READS)					      \
	{								      \
	  __set_errno (EBADF);						      \
	  return EOF;							      \
	}								      \
      else if (format == NULL)						      \
	{								      \
	  MAYBE_SET_EINVAL;						      \
	  return EOF;							      \
	}								      \
    } while (0)
# define LOCK_STREAM(S)							      \
  __libc_cleanup_region_start ((void (*) (void *)) &_IO_funlockfile, (S));    \
  _IO_flockfile (S)
# define UNLOCK_STREAM __libc_cleanup_region_end (1)
#else
# define ungetc(c, s)	((void) (c != EOF && --read_in), ungetc (c, s))
# define inchar()	(c == EOF ? EOF					      \
			 : (c = getc (s)), (void) (c != EOF && ++read_in), c)
# define encode_error()	do {						      \
			  funlockfile (s);				      \
			  __set_errno (EILSEQ);				      \
			  return done;					      \
			} while (0)
# define conv_error()	do {						      \
			  funlockfile (s);				      \
			  return done;					      \
			} while (0)
# define input_error()	do {						      \
			  funlockfile (s);				      \
			  return done ?: EOF;				      \
			} while (0)
# define memory_error()	do {						      \
			  funlockfile (s);				      \
			  __set_errno (ENOMEM);				      \
			  return EOF;					      \
			} while (0)
# define ARGCHECK(s, format)						      \
  do									      \
    {									      \
      /* Check file argument for consistence.  */			      \
      if (!__validfp (s) || !s->__mode.__read)				      \
	{								      \
	  __set_errno (EBADF);						      \
	  return EOF;							      \
	}								      \
      else if (format == NULL)						      \
	{								      \
	  __set_errno (EINVAL);						      \
	  return EOF;							      \
	}								      \
    } while (0)
#if 1
      /* XXX For now !!! */
# define flockfile(S) /* nothing */
# define funlockfile(S) /* nothing */
# define LOCK_STREAM(S)
# define UNLOCK_STREAM
#else
# define LOCK_STREAM(S)							      \
  __libc_cleanup_region_start (&__funlockfile, (S));			      \
  __flockfile (S)
# define UNLOCK_STREAM __libc_cleanup_region_end (1)
#endif
#endif


/* Read formatted input from S according to the format string
   FORMAT, using the argument list in ARG.
   Return the number of assignments made, or -1 for an input error.  */
#ifdef USE_IN_LIBIO
int
_IO_vfscanf (s, format, argptr, errp)
     _IO_FILE *s;
     const char *format;
     _IO_va_list argptr;
     int *errp;
#else
int
__vfscanf (FILE *s, const char *format, va_list argptr)
#endif
{
  va_list arg;
  register const char *f = format;
  register unsigned char fc;	/* Current character of the format.  */
  register size_t done = 0;	/* Assignments done.  */
  register size_t read_in = 0;	/* Chars read in.  */
  register int c = 0;		/* Last char read.  */
  register int width;		/* Maximum field width.  */
  register int flags;		/* Modifiers for current format element.  */

  /* Status for reading F-P nums.  */
  char got_dot, got_e, negative;
  /* If a [...] is a [^...].  */
  char not_in;
#define exp_char not_in
  /* Base for integral numbers.  */
  int base;
  /* Signedness for integral numbers.  */
  int number_signed;
#define is_hexa number_signed
  /* Decimal point character.  */
  wchar_t decimal;
  /* The thousands character of the current locale.  */
  wchar_t thousands;
  /* Integral holding variables.  */
  union
    {
      long long int q;
      unsigned long long int uq;
      long int l;
      unsigned long int ul;
    } num;
  /* Character-buffer pointer.  */
  char *str = NULL;
  wchar_t *wstr = NULL;
  char **strptr = NULL;
  size_t strsize = 0;
  /* We must not react on white spaces immediately because they can
     possibly be matched even if in the input stream no character is
     available anymore.  */
  int skip_space = 0;
  /* Workspace.  */
  char *tw;			/* Temporary pointer.  */
  char *wp = NULL;		/* Workspace.  */
  size_t wpmax = 0;		/* Maximal size of workspace.  */
  size_t wpsize;		/* Currently used bytes in workspace.  */
#define ADDW(Ch)							    \
  do									    \
    {									    \
      if (wpsize == wpmax)						    \
	{								    \
	  char *old = wp;						    \
	  wpmax = UCHAR_MAX > 2 * wpmax ? UCHAR_MAX : 2 * wpmax;	    \
	  wp = (char *) alloca (wpmax);					    \
	  if (old != NULL)						    \
	    memcpy (wp, old, wpsize);					    \
	}								    \
      wp[wpsize++] = (Ch);						    \
    }									    \
  while (0)

#ifdef __va_copy
  __va_copy (arg, argptr);
#else
  arg = (va_list) argptr;
#endif

  ARGCHECK (s, format);

  /* Figure out the decimal point character.  */
  if (mbtowc (&decimal, _NL_CURRENT (LC_NUMERIC, DECIMAL_POINT),
	      strlen (_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT))) <= 0)
    decimal = (wchar_t) *_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT);
  /* Figure out the thousands separator character.  */
  if (mbtowc (&thousands, _NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP),
	      strlen (_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP))) <= 0)
    thousands = (wchar_t) *_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP);

  /* Lock the stream.  */
  LOCK_STREAM (s);

  /* Run through the format string.  */
  while (*f != '\0')
    {
      unsigned int argpos;
      /* Extract the next argument, which is of type TYPE.
	 For a %N$... spec, this is the Nth argument from the beginning;
	 otherwise it is the next argument after the state now in ARG.  */
#ifdef __va_copy
# define ARG(type)	(argpos == 0 ? va_arg (arg, type) :		      \
			 ({ unsigned int pos = argpos;			      \
			    va_list arg;				      \
			    __va_copy (arg, argptr);			      \
			    while (--pos > 0)				      \
			      (void) va_arg (arg, void *);		      \
			    va_arg (arg, type);				      \
			  }))
#else
# if 0
      /* XXX Possible optimization.  */
#  define ARG(type)	(argpos == 0 ? va_arg (arg, type) :		      \
			 ({ va_list arg = (va_list) argptr;		      \
			    arg = (va_list) ((char *) arg		      \
					     + (argpos - 1)		      \
					     * __va_rounded_size (void *));   \
			    va_arg (arg, type);				      \
			 }))
# else
#  define ARG(type)	(argpos == 0 ? va_arg (arg, type) :		      \
			 ({ unsigned int pos = argpos;			      \
			    va_list arg = (va_list) argptr;		      \
			    while (--pos > 0)				      \
			      (void) va_arg (arg, void *);		      \
			    va_arg (arg, type);				      \
			  }))
# endif
#endif

      if (!isascii (*f))
	{
	  /* Non-ASCII, may be a multibyte.  */
	  int len = mblen (f, strlen (f));
	  if (len > 0)
	    {
	      do
		{
		  c = inchar ();
		  if (c == EOF)
		    input_error ();
		  else if (c != *f++)
		    {
		      ungetc (c, s);
		      conv_error ();
		    }
		}
	      while (--len > 0);
	      continue;
	    }
	}

      fc = *f++;
      if (fc != '%')
	{
	  /* Remember to skip spaces.  */
	  if (isspace (fc))
	    {
	      skip_space = 1;
	      continue;
	    }

	  /* Read a character.  */
	  c = inchar ();

	  /* Characters other than format specs must just match.  */
	  if (c == EOF)
	    input_error ();

	  /* We saw white space char as the last character in the format
	     string.  Now it's time to skip all leading white space.  */
	  if (skip_space)
	    {
	      while (isspace (c))
		if (inchar () == EOF && errno == EINTR)
		  conv_error ();
	      skip_space = 0;
	    }

	  if (c != fc)
	    {
	      ungetc (c, s);
	      conv_error ();
	    }

	  continue;
	}

      /* This is the start of the conversion string. */
      flags = 0;

      /* Initialize state of modifiers.  */
      argpos = 0;

      /* Prepare temporary buffer.  */
      wpsize = 0;

      /* Check for a positional parameter specification.  */
      if (isdigit (*f))
	{
	  argpos = *f++ - '0';
	  while (isdigit (*f))
	    argpos = argpos * 10 + (*f++ - '0');
	  if (*f == '$')
	    ++f;
	  else
	    {
	      /* Oops; that was actually the field width.  */
	      width = argpos;
	      flags |= WIDTH;
	      argpos = 0;
	      goto got_width;
	    }
	}

      /* Check for the assignment-suppressing and the number grouping flag.  */
      while (*f == '*' || *f == '\'')
	switch (*f++)
	  {
	  case '*':
	    flags |= SUPPRESS;
	    break;
	  case '\'':
	    flags |= GROUP;
	    break;
	  }

      /* We have seen width. */
      if (isdigit (*f))
	flags |= WIDTH;

      /* Find the maximum field width.  */
      width = 0;
      while (isdigit (*f))
	{
	  width *= 10;
	  width += *f++ - '0';
	}
    got_width:
      if (width == 0)
	width = -1;

      /* Check for type modifiers.  */
      while (*f == 'h' || *f == 'l' || *f == 'L' || *f == 'a' || *f == 'q')
	switch (*f++)
	  {
	  case 'h':
	    /* int's are short int's.  */
	    if (flags & (LONG|LONGDBL|CHAR))
	      /* Signal illegal format element.  */
	      conv_error ();
	    if (flags & SHORT)
	      {
		flags &= ~SHORT;
		flags |= CHAR;
	      }
	    else
	      flags |= SHORT;
	    break;
	  case 'l':
	    if (flags & (SHORT|LONGDBL|CHAR))
	      conv_error ();
	    else if (flags & LONG)
	      {
		/* A double `l' is equivalent to an `L'.  */
		flags &= ~LONG;
		flags |= LONGDBL;
	      }
	    else
	      /* int's are long int's.  */
	      flags |= LONG;
	    break;
	  case 'q':
	  case 'L':
	    /* double's are long double's, and int's are long long int's.  */
	    if (flags & TYPEMOD)
	      /* Signal illegal format element.  */
	      conv_error ();
	    flags |= LONGDBL;
	    break;
	  case 'a':
	    /* The `a' is used as a flag only if followed by `s', `S' or
	       `['.  */
	    if (*f != 's' && *f != 'S' && *f != '[')
	      {
		--f;
		break;
	      }
	    if (flags & TYPEMOD)
	      /* Signal illegal format element.  */
	      conv_error ();
	    /* String conversions (%s, %[) take a `char **'
	       arg and fill it in with a malloc'd pointer.  */
	    flags |= MALLOC;
	    break;
	  }

      /* End of the format string?  */
      if (*f == '\0')
	conv_error ();

      /* Find the conversion specifier.  */
      fc = *f++;
      if (skip_space || (fc != '[' && fc != 'c' && fc != 'C' && fc != 'n'))
	{
	  /* Eat whitespace.  */
	  int save_errno = errno;
	  errno = 0;
	  do
	    if (inchar () == EOF && errno == EINTR)
	      input_error ();
	  while (isspace (c));
	  errno = save_errno;
	  ungetc (c, s);
	  skip_space = 0;
	}

      switch (fc)
	{
	case '%':	/* Must match a literal '%'.  */
	  c = inchar ();
	  if (c == EOF)
	    input_error ();
	  if (c != fc)
	    {
	      ungetc (c, s);
	      conv_error ();
	    }
	  break;

	case 'n':	/* Answer number of assignments done.  */
	  /* Corrigendum 1 to ISO C 1990 describes the allowed flags
	     with the 'n' conversion specifier.  */
	  if (!(flags & SUPPRESS))
	    {
	      /* Don't count the read-ahead.  */
	      if (flags & LONGDBL)
		*ARG (long long int *) = read_in;
	      else if (flags & LONG)
		*ARG (long int *) = read_in;
	      else if (flags & SHORT)
		*ARG (short int *) = read_in;
	      else
		*ARG (int *) = read_in;

#ifdef NO_BUG_IN_ISO_C_CORRIGENDUM_1
	      /* We have a severe problem here.  The ISO C standard
		 contradicts itself in explaining the effect of the %n
		 format in `scanf'.  While in ISO C:1990 and the ISO C
		 Amendement 1:1995 the result is described as

		   Execution of a %n directive does not effect the
		   assignment count returned at the completion of
		   execution of the f(w)scanf function.

		 in ISO C Corrigendum 1:1994 the following was added:

		   Subclause 7.9.6.2
		   Add the following fourth example:
		     In:
		       #include <stdio.h>
		       int d1, d2, n1, n2, i;
		       i = sscanf("123", "%d%n%n%d", &d1, &n1, &n2, &d2);
		     the value 123 is assigned to d1 and the value3 to n1.
		     Because %n can never get an input failure the value
		     of 3 is also assigned to n2.  The value of d2 is not
		     affected.  The value 3 is assigned to i.

		 We go for now with the historically correct code from ISO C,
		 i.e., we don't count the %n assignments.  When it ever
		 should proof to be wrong just remove the #ifdef above.  */
	      ++done;
#endif
	    }
	  break;

	case 'c':	/* Match characters.  */
	  if ((flags & LONG) == 0)
	    {
	      if (!(flags & SUPPRESS))
		{
		  str = ARG (char *);
		  if (str == NULL)
		    conv_error ();
		}

	      c = inchar ();
	      if (c == EOF)
		input_error ();

	      if (width == -1)
		width = 1;

	      if (!(flags & SUPPRESS))
		{
		  do
		    *str++ = c;
		  while (--width > 0 && inchar () != EOF);
		}
	      else
		while (--width > 0 && inchar () != EOF);

	      if (!(flags & SUPPRESS))
		++done;

	      break;
	    }
	  /* FALLTHROUGH */
	case 'C':
	  /* Get UTF-8 encoded wide character.  Here we assume (as in
	     other parts of the libc) that we only have to handle
	     UTF-8.  */
	  {
	    wint_t val;
	    size_t cnt = 0;
	    int first = 1;

	    if (!(flags & SUPPRESS))
	      {
		wstr = ARG (wchar_t *);
		if (str == NULL)
		  conv_error ();
	      }

	    do
	      {
#define NEXT_WIDE_CHAR(First)						      \
		c = inchar ();						      \
		if (c == EOF)						      \
		  /* EOF is only an error for the first character.  */	      \
		  if (First)						      \
		    input_error ();					      \
		  else							      \
		    break;						      \
		val = c;						      \
		if (val >= 0x80)					      \
		  {							      \
		    if ((c & 0xc0) == 0x80 || (c & 0xfe) == 0xfe)	      \
		      encode_error ();					      \
		    if ((c & 0xe0) == 0xc0)				      \
		      {							      \
			/* We expect two bytes.  */			      \
			cnt = 1;					      \
			val &= 0x1f;					      \
		      }							      \
		    else if ((c & 0xf0) == 0xe0)			      \
		      {							      \
			/* We expect three bytes.  */			      \
			cnt = 2;					      \
			val &= 0x0f;					      \
		      }							      \
		    else if ((c & 0xf8) == 0xf0)			      \
		      {							      \
			/* We expect four bytes.  */			      \
			cnt = 3;					      \
			val &= 0x07;					      \
		      }							      \
		    else if ((c & 0xfc) == 0xf8)			      \
		      {							      \
			/* We expect five bytes.  */			      \
			cnt = 4;					      \
			val &= 0x03;					      \
		      }							      \
		    else						      \
		      {							      \
			/* We expect six bytes.  */			      \
			cnt = 5;					      \
			val &= 0x01;					      \
		      }							      \
		    							      \
		    do							      \
		      {							      \
			c = inchar ();					      \
			if (c == EOF					      \
			    || (c & 0xc0) == 0x80 || (c & 0xfe) == 0xfe)      \
			  encode_error ();				      \
			val <<= 6;					      \
			val |= c & 0x3f;				      \
		      }							      \
		    while (--cnt > 0);					      \
		  }							      \
									      \
		if (!(flags & SUPPRESS))				      \
		  *wstr++ = val;					      \
		First = 0

		NEXT_WIDE_CHAR (first);
	      }
	    while (--width > 0);

	    if (!(flags & SUPPRESS))
	      ++done;
	  }
	  break;

	case 's':		/* Read a string.  */
	  if (flags & LONG)
	    /* We have to process a wide character string.  */
	    goto wide_char_string;

#define STRING_ARG(Str, Type)						      \
	  if (!(flags & SUPPRESS))					      \
	    {								      \
	      if (flags & MALLOC)					      \
		{							      \
		  /* The string is to be stored in a malloc'd buffer.  */     \
		  strptr = ARG (char **);				      \
		  if (strptr == NULL)					      \
		    conv_error ();					      \
		  /* Allocate an initial buffer.  */			      \
		  strsize = 100;					      \
		  *strptr = malloc (strsize * sizeof (Type));		      \
		  Str = (Type *) *strptr;				      \
		}							      \
	      else							      \
		Str = ARG (Type *);					      \
	      if (Str == NULL)						      \
		conv_error ();						      \
	    }
	  STRING_ARG (str, char);

	  c = inchar ();
	  if (c == EOF)
	    input_error ();

	  do
	    {
	      if (isspace (c))
		{
		  ungetc (c, s);
		  break;
		}
#define	STRING_ADD_CHAR(Str, c, Type)					      \
	      if (!(flags & SUPPRESS))					      \
		{							      \
		  *Str++ = c;						      \
		  if ((flags & MALLOC) && (char *) Str == *strptr + strsize)  \
		    {							      \
		      /* Enlarge the buffer.  */			      \
		      Str = realloc (*strptr, strsize * 2 * sizeof (Type));   \
		      if (Str == NULL)					      \
			{						      \
			  /* Can't allocate that much.  Last-ditch effort.  */\
			  Str = realloc (*strptr,			      \
					 (strsize + 1) * sizeof (Type));      \
			  if (Str == NULL)				      \
			    {						      \
			      /* We lose.  Oh well.			      \
				 Terminate the string and stop converting,    \
				 so at least we don't skip any input.  */     \
			      ((Type *) (*strptr))[strsize] = '\0';	      \
			      ++done;					      \
			      conv_error ();				      \
			    }						      \
			  else						      \
			    {						      \
			      *strptr = (char *) Str;			      \
			      Str = ((Type *) *strptr) + strsize;	      \
			      ++strsize;				      \
			    }						      \
			}						      \
		      else						      \
			{						      \
			  *strptr = (char *) Str;			      \
			  Str = ((Type *) *strptr) + strsize;		      \
			  strsize *= 2;					      \
			}						      \
		    }							      \
		}
	      STRING_ADD_CHAR (str, c, char);
	    } while ((width <= 0 || --width > 0) && inchar () != EOF);

	  if (!(flags & SUPPRESS))
	    {
	      *str = '\0';
	      ++done;
	    }
	  break;

	case 'S':
	  /* Wide character string.  */
	wide_char_string:
	  {
	    wint_t val;
	    int first = 1;
	    STRING_ARG (wstr, wchar_t);

	    do
	      {
		size_t cnt = 0;
		NEXT_WIDE_CHAR (first);

		if (iswspace (val))
		  {
		    /* XXX We would have to push back the whole wide char
		       with possibly many bytes.  But since scanf does
		       not make a difference for white space characters
		       we can simply push back a simple <SP> which is
		       guaranteed to be in the [:space:] class.  */
		    ungetc (' ', s);
		    break;
		  }

		STRING_ADD_CHAR (wstr, val, wchar_t);
		first = 0;
	      }
	    while (width <= 0 || --width > 0);

	    if (!(flags & SUPPRESS))
	      {
		*wstr = L'\0';
		++done;
	      }
	  }
	  break;

	case 'x':	/* Hexadecimal integer.  */
	case 'X':	/* Ditto.  */
	  base = 16;
	  number_signed = 0;
	  goto number;

	case 'o':	/* Octal integer.  */
	  base = 8;
	  number_signed = 0;
	  goto number;

	case 'u':	/* Unsigned decimal integer.  */
	  base = 10;
	  number_signed = 0;
	  goto number;

	case 'd':	/* Signed decimal integer.  */
	  base = 10;
	  number_signed = 1;
	  goto number;

	case 'i':	/* Generic number.  */
	  base = 0;
	  number_signed = 1;

	number:
	  c = inchar ();
	  if (c == EOF)
	    input_error ();

	  /* Check for a sign.  */
	  if (c == '-' || c == '+')
	    {
	      ADDW (c);
	      if (width > 0)
		--width;
	      c = inchar ();
	    }

	  /* Look for a leading indication of base.  */
	  if (width != 0 && c == '0')
	    {
	      if (width > 0)
		--width;

	      ADDW (c);
	      c = inchar ();

	      if (width != 0 && tolower (c) == 'x')
		{
		  if (base == 0)
		    base = 16;
		  if (base == 16)
		    {
		      if (width > 0)
			--width;
		      c = inchar ();
		    }
		}
	      else if (base == 0)
		base = 8;
	    }

	  if (base == 0)
	    base = 10;

	  /* Read the number into workspace.  */
	  while (c != EOF && width != 0)
	    {
	      if (base == 16 ? !isxdigit (c) :
		  ((!isdigit (c) || c - '0' >= base) &&
		   !((flags & GROUP) && base == 10 && c == thousands)))
		break;
	      ADDW (c);
	      if (width > 0)
		--width;

	      c = inchar ();
	    }

	  /* The just read character is not part of the number anymore.  */
	  ungetc (c, s);

	  if (wpsize == 0 ||
	      (wpsize == 1 && (wp[0] == '+' || wp[0] == '-')))
	    /* There was no number.  */
	    conv_error ();

	  /* Convert the number.  */
	  ADDW ('\0');
	  if (flags & LONGDBL)
	    {
	      if (number_signed)
		num.q = __strtoll_internal (wp, &tw, base, flags & GROUP);
	      else
		num.uq = __strtoull_internal (wp, &tw, base, flags & GROUP);
	    }
	  else
	    {
	      if (number_signed)
		num.l = __strtol_internal (wp, &tw, base, flags & GROUP);
	      else
		num.ul = __strtoul_internal (wp, &tw, base, flags & GROUP);
	    }
	  if (wp == tw)
	    conv_error ();

	  if (!(flags & SUPPRESS))
	    {
	      if (! number_signed)
		{
		  if (flags & LONGDBL)
		    *ARG (unsigned LONGLONG int *) = num.uq;
		  else if (flags & LONG)
		    *ARG (unsigned long int *) = num.ul;
		  else if (flags & SHORT)
		    *ARG (unsigned short int *)
		      = (unsigned short int) num.ul;
		  else if (flags & CHAR)
		    *ARG (unsigned char *) = (unsigned char) num.ul;
		  else
		    *ARG (unsigned int *) = (unsigned int) num.ul;
		}
	      else
		{
		  if (flags & LONGDBL)
		    *ARG (LONGLONG int *) = num.q;
		  else if (flags & LONG)
		    *ARG (long int *) = num.l;
		  else if (flags & SHORT)
		    *ARG (short int *) = (short int) num.l;
		  else if (flags & CHAR)
		    *ARG (signed char *) = (signed char) num.ul;
		  else
		    *ARG (int *) = (int) num.l;
		}
	      ++done;
	    }
	  break;

	case 'e':	/* Floating-point numbers.  */
	case 'E':
	case 'f':
	case 'g':
	case 'G':
	case 'a':
	case 'A':
	  c = inchar ();
	  if (c == EOF)
	    input_error ();

	  /* Check for a sign.  */
	  if (c == '-' || c == '+')
	    {
	      negative = c == '-';
	      if (inchar () == EOF)
		/* EOF is only an input error before we read any chars.  */
		conv_error ();
	      if (width > 0)
		--width;
	    }
	  else
	    negative = 0;

	  is_hexa = 0;
	  exp_char = 'e';
	  if (c == '0')
	    {
	      ADDW (c);
	      c = inchar ();
	      if (tolower (c) == 'x')
		{
		  /* It is a number in hexadecimal format.  */
		  ADDW (c);

		  is_hexa = 1;
		  exp_char = 'p';

		  /* Grouping is not allowed.  */
		  flags &= ~GROUP;
		  c = inchar ();
		}
	    }

	  got_dot = got_e = 0;
	  do
	    {
	      if (isdigit (c))
		ADDW (c);
	      else if (!got_e && is_hexa && isxdigit (c))
		ADDW (c);
	      else if (got_e && wp[wpsize - 1] == exp_char
		       && (c == '-' || c == '+'))
		ADDW (c);
	      else if (wpsize > 0 && !got_e && tolower (c) == exp_char)
		{
		  ADDW (exp_char);
		  got_e = got_dot = 1;
		}
	      else if (c == decimal && !got_dot)
		{
		  ADDW (c);
		  got_dot = 1;
		}
	      else if ((flags & GROUP) && c == thousands && !got_dot)
		ADDW (c);
	      else
		{
		  /* The last read character is not part of the number
		     anymore.  */
		  ungetc (c, s);
		  break;
		}
	      if (width > 0)
		--width;
	    }
	  while (width != 0 && inchar () != EOF);

	  /* Have we read any character?  If we try to read a number
	     in hexadecimal notation and we have read only the `0x'
	     prefix this is an error.  */
	  if (wpsize == 0 || (is_hexa && wpsize == 2))
	    conv_error ();

	  /* Convert the number.  */
	  ADDW ('\0');
	  if (flags & LONGDBL)
	    {
	      long double d = __strtold_internal (wp, &tw, flags & GROUP);
	      if (!(flags & SUPPRESS) && tw != wp)
		*ARG (long double *) = negative ? -d : d;
	    }
	  else if (flags & LONG)
	    {
	      double d = __strtod_internal (wp, &tw, flags & GROUP);
	      if (!(flags & SUPPRESS) && tw != wp)
		*ARG (double *) = negative ? -d : d;
	    }
	  else
	    {
	      float d = __strtof_internal (wp, &tw, flags & GROUP);
	      if (!(flags & SUPPRESS) && tw != wp)
		*ARG (float *) = negative ? -d : d;
	    }

	  if (tw == wp)
	    conv_error ();

	  if (!(flags & SUPPRESS))
	    ++done;
	  break;

	case '[':	/* Character class.  */
	  if (flags & LONG)
	    {
	      STRING_ARG (wstr, wchar_t);
	      c = '\0';		/* This is to keep gcc quiet.  */
	    }
	  else
	    {
	      STRING_ARG (str, char);

	      c = inchar ();
	      if (c == EOF)
		input_error ();
	    }

	  if (*f == '^')
	    {
	      ++f;
	      not_in = 1;
	    }
	  else
	    not_in = 0;

	  /* Fill WP with byte flags indexed by character.
	     We will use this flag map for matching input characters.  */
	  if (wpmax < UCHAR_MAX)
	    {
	      wpmax = UCHAR_MAX;
	      wp = (char *) alloca (wpmax);
	    }
	  memset (wp, 0, UCHAR_MAX);

	  fc = *f;
	  if (fc == ']' || fc == '-')
	    {
	      /* If ] or - appears before any char in the set, it is not
		 the terminator or separator, but the first char in the
		 set.  */
	      wp[fc] = 1;
	      ++f;
	    }

	  while ((fc = *f++) != '\0' && fc != ']')
	    {
	      if (fc == '-' && *f != '\0' && *f != ']' &&
		  (unsigned char) f[-2] <= (unsigned char) *f)
		{
		  /* Add all characters from the one before the '-'
		     up to (but not including) the next format char.  */
		  for (fc = f[-2]; fc < *f; ++fc)
		    wp[fc] = 1;
		}
	      else
		/* Add the character to the flag map.  */
		wp[fc] = 1;
	    }
	  if (fc == '\0')
	    {
	      if (!(flags & LONG))
		ungetc (c, s);
	      conv_error();
	    }

	  if (flags & LONG)
	    {
	      wint_t val;
	      int first = 1;

	      do
		{
		  size_t cnt = 0;
		  NEXT_WIDE_CHAR (first);
		  if (val > 255 || wp[val] == not_in)
		    {
		      /* XXX We have a problem here.  We read a wide
			 character and this possibly took several
			 bytes.  But we can only push back one single
			 character.  To be sure we don't create wrong
			 input we push it back only in case it is
			 representable within one byte.  */
		      if (val < 0x80)
			ungetc (val, s);
		      break;
		    }
		  STRING_ADD_CHAR (wstr, val, wchar_t);
		  if (width > 0)
		    --width;
		  first = 0;
		}
	      while (width != 0);

	      if (first)
		conv_error ();

	      if (!(flags & SUPPRESS))
		{
		  *wstr = L'\0';
		  ++done;
		}
	    }
	  else
	    {
	      num.ul = read_in - 1; /* -1 because we already read one char.  */
	      do
		{
		  if (wp[c] == not_in)
		    {
		      ungetc (c, s);
		      break;
		    }
		  STRING_ADD_CHAR (str, c, char);
		  if (width > 0)
		    --width;
		}
	      while (width != 0 && inchar () != EOF);

	      if (read_in == num.ul)
		conv_error ();

	      if (!(flags & SUPPRESS))
		{
		  *str = '\0';
		  ++done;
		}
	    }
	  break;

	case 'p':	/* Generic pointer.  */
	  base = 16;
	  /* A PTR must be the same size as a `long int'.  */
	  flags &= ~(SHORT|LONGDBL);
	  flags |= LONG;
	  number_signed = 0;
	  goto number;
	}
    }

  /* The last thing we saw int the format string was a white space.
     Consume the last white spaces.  */
  if (skip_space)
    {
      do
	c = inchar ();
      while (isspace (c));
      ungetc (c, s);
    }

  /* Unlock stream.  */
  UNLOCK_STREAM;

  return done;
}

#ifdef USE_IN_LIBIO
int
__vfscanf (FILE *s, const char *format, va_list argptr)
{
  return _IO_vfscanf (s, format, argptr, NULL);
}
#endif

weak_alias (__vfscanf, vfscanf)