summary refs log tree commit diff
path: root/stdio-common/vfscanf.c
blob: a778346287cdccf3ceae2034a88518f1f88ff4e4 (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
/* Copyright (C) 1991, 1992, 1993, 1994, 1995 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., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <ansidecl.h>
#include "../locale/localeinfo.h"
#include <errno.h>
#include <limits.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


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


#define	inchar()	((c = getc(s)) == EOF ? EOF : (++read_in, c))
#define	conv_error()	return (ungetc(c, s), done)
#define input_error()	return (done == 0 ? EOF : done)
#define	memory_error()	return ((errno = ENOMEM), EOF)


/* 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.  */
int
DEFUN(__vfscanf, (s, format, arg),
      FILE *s AND CONST char *format AND va_list argptr)
{
  va_list arg = (va_list) argptr;

  register CONST char *f = format;
  register 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;		/* Last char read.  */
  register int do_assign;	/* Whether to do an assignment.  */
  register int width;		/* Maximum field width.  */
  int group_flag;		/* %' modifier flag.  */

  /* Type modifiers.  */
  int is_short, is_long, is_long_double;
#ifdef	HAVE_LONGLONG
  /* We use the `L' modifier for `long long int'.  */
#define	is_longlong	is_long_double
#else
#define	is_longlong	0
#endif
  int malloc_string;		/* Args are char ** to be filled in.  */
  /* Status for reading F-P nums.  */
  char got_dot, got_e;
  /* If a [...] is a [^...].  */
  char not_in;
  /* Base for integral numbers.  */
  int base;
  /* Signedness for integral numbers.  */
  int number_signed;
  /* Integral holding variables.  */
  union
    {
      long long int q;
      unsigned long long int uq;
      long int l;
      unsigned long int ul;
    } num;
  /* Character-buffer pointer.  */
  register char *str, **strptr;
  size_t strsize;
  /* Workspace.  */
  char work[200];
  char *w;			/* Pointer into WORK.  */
  wchar_t decimal;		/* Decimal point character.  */

  if (!__validfp(s) || !s->__mode.__read || format == NULL)
    {
      errno = EINVAL;
      return EOF;
    }

  /* 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);

  c = inchar();

  /* 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.  */
#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);				      \
			  }))

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

      fc = *f++;
      if (fc != '%')
	{
	  /* Characters other than format specs must just match.  */
	  if (c == EOF)
	    input_error();
	  if (isspace(fc))
	    {
	      /* Whitespace characters match any amount of whitespace.  */
	      while (isspace (c))
		inchar ();
	      continue;
	    }
	  else if (c == fc)
	    (void) inchar();
	  else
	    conv_error();
	  continue;
	}

      /* Initialize state of modifiers.  */
      argpos = 0;
      do_assign = 1;
      group_flag = 0;
      is_short = is_long = is_long_double = malloc_string = 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;
	      argpos = 0;
	      goto got_width;
	    }
	}

      /* Check for the assignment-suppressant and the number grouping flag.  */
      while (*f == '*' || *f == '\'')
	switch (*f++)
	  {
	  case '*':
	    do_assign = 0;
	    break;
	  case '\'':
	    group_flag = 1;
	    break;
	  }

      /* 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.  */
	    is_short = 1;
	    break;
	  case 'l':
	    if (is_long)
	      /* A double `l' is equivalent to an `L'.  */
	      is_longlong = 1;
	    else
	      /* int's are long int's.  */
	      is_long = 1;
	    break;
	  case 'q':
	  case 'L':
	    /* double's are long double's, and int's are long long int's.  */
	    is_long_double = 1;
	    break;
	  case 'a':
	    /* String conversions (%s, %[) take a `char **'
	       arg and fill it in with a malloc'd pointer.  */
	    malloc_string = 1;
	    break;
	  }

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

      /* Find the conversion specifier.  */
      w = work;
      fc = *f++;
      if (fc != '[' && fc != 'c' && fc != 'n')
	/* Eat whitespace.  */
	while (isspace(c))
	  (void) inchar();
      switch (fc)
	{
	case '%':	/* Must match a literal '%'.  */
	  if (c != fc)
	    conv_error();
	  break;

	case 'n':	/* Answer number of assignments done.  */
	  if (do_assign)
	    *ARG (int *) = read_in - 1;	/* Don't count the read-ahead.  */
	  break;

	case 'c':	/* Match characters.  */
	  if (do_assign)
	    {
	      str = ARG (char *);
	      if (str == NULL)
		conv_error ();
	    }

	  if (c == EOF)
	    input_error();

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

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

	  if (do_assign)
	    ++done;

	  break;

	case 's':		/* Read a string.  */
#define STRING_ARG							      \
	  if (do_assign)						      \
	    {								      \
	      if (malloc_string)					      \
		{							      \
		  /* 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 = str = malloc (strsize);			      \
		}							      \
	      else							      \
		str = ARG (char *);				      \
	      if (str == NULL)						      \
		conv_error ();						      \
	    }
	  STRING_ARG;

	  if (c == EOF)
	    input_error ();

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

	  if (do_assign)
	    {
	      *str = '\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:
	  if (c == EOF)
	    input_error();

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

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

	      (void) inchar();

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

	  if (base == 0)
	    base = 10;

	  /* Read the number into WORK.  */
	  while (width != 0 && c != EOF)
	    {
	      if (base == 16 ? !isxdigit(c) :
		  (!isdigit(c) || c - '0' >= base))
		break;
	      *w++ = c;
	      if (width > 0)
		--width;
	      (void) inchar ();
	    }

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

	  /* Convert the number.  */
	  *w = '\0';
	  if (is_longlong)
	    {
	      if (number_signed)
		num.q = __strtoq_internal (work, &w, base, group_flag);
	      else
		num.uq = __strtouq_internal (work, &w, base, group_flag);
	    }
	  else
	    {
	      if (number_signed)
		num.l = __strtol_internal (work, &w, base, group_flag);
	      else
		num.ul = __strtoul_internal (work, &w, base, group_flag);
	    }
	  if (w == work)
	    conv_error ();

	  if (do_assign)
	    {
	      if (! number_signed)
		{
		  if (is_longlong)
		    *ARG (unsigned LONGLONG int *) = num.uq;
		  else if (is_long)
		    *ARG (unsigned long int *) = num.ul;
		  else if (is_short)
		    *ARG (unsigned short int *)
		      = (unsigned short int) num.ul;
		  else
		    *ARG (unsigned int *) = (unsigned int) num.ul;
		}
	      else
		{
		  if (is_longlong)
		    *ARG (LONGLONG int *) = num.q;
		  else if (is_long)
		    *ARG (long int *) = num.l;
		  else if (is_short)
		    *ARG (short int *) = (short int) num.l;
		  else
		    *ARG (int *) = (int) num.l;
		}
	      ++done;
	    }
	  break;

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

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

	  got_dot = got_e = 0;
	  do
	    {
	      if (isdigit(c))
		*w++ = c;
	      else if (got_e && w[-1] == 'e' && (c == '-' || c == '+'))
		*w++ = c;
	      else if (!got_e && tolower(c) == 'e')
		{
		  *w++ = 'e';
		  got_e = got_dot = 1;
		}
	      else if (c == decimal && !got_dot)
		{
		  *w++ = c;
		  got_dot = 1;
		}
	      else
		break;
	      if (width > 0)
		--width;
	    } while (inchar() != EOF && width != 0);

	  if (w == work)
	    conv_error();
	  if (w[-1] == '-' || w[-1] == '+' || w[-1] == 'e')
	    conv_error();

	  /* Convert the number.  */
	  *w = '\0';
	  if (is_long_double)
	    {
	      long double d = __strtold_internal (work, &w, group_flag);
	      if (do_assign && w != work)
		*ARG (long double *) = d;
	    }
	  else if (is_long)
	    {
	      double d = __strtod_internal (work, &w, group_flag);
	      if (do_assign && w != work)
		*ARG (double *) = d;
	    }
	  else
	    {
	      float d = __strtof_internal (work, &w, group_flag);
	      if (do_assign && w != work)
		*ARG (float *) = d;
	    }

	  if (w == work)
	    conv_error ();

	  if (do_assign)
	    ++done;
	  break;

	case '[':	/* Character class.  */
	  STRING_ARG;

	  if (c == EOF)
	    input_error();

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

	  while ((fc = *f++) != '\0' && fc != ']')
	    {
	      if (fc == '-' && *f != '\0' && *f != ']' &&
		  w > work && w[-1] <= *f)
		/* Add all characters from the one before the '-'
		   up to (but not including) the next format char.  */
		for (fc = w[-1] + 1; fc < *f; ++fc)
		  *w++ = fc;
	      else
		/* Add the character to the list.  */
		*w++ = fc;
	    }
	  if (fc == '\0')
	    conv_error();

	  *w = '\0';
	  num.ul = read_in;
	  do
	    {
	      if ((strchr (work, c) == NULL) != not_in)
		break;
	      STRING_ADD_CHAR (c);
	      if (width > 0)
		--width;
	    } while (inchar () != EOF && width != 0);
	  if (read_in == num.ul)
	    conv_error ();

	  if (do_assign)
	    {
	      *str = '\0';
	      ++done;
	    }
	  break;

	case 'p':	/* Generic pointer.  */
	  base = 16;
	  /* A PTR must be the same size as a `long int'.  */
	  is_long = 1;
	  goto number;
	}
    }

  conv_error();
}

weak_alias (__vfscanf, vfscanf)