summary refs log tree commit diff
path: root/stdio-common/printf-parsemb.c
blob: 66cef10b209686d66d1c81589cd9a7db761dd851 (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
/* Helper functions for parsing printf format strings.
   Copyright (C) 1995-2016 Free Software Foundation, Inc.
   This file is part of th GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <ctype.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <wchar.h>
#include <wctype.h>

#ifndef COMPILE_WPRINTF
# define CHAR_T		char
# define UCHAR_T	unsigned char
# define INT_T		int
# define L_(Str)	Str
# define ISDIGIT(Ch)	isdigit (Ch)
# define HANDLE_REGISTERED_MODIFIER __handle_registered_modifier_mb
#else
# define CHAR_T		wchar_t
# define UCHAR_T	unsigned int
# define INT_T		wint_t
# define L_(Str)	L##Str
# define ISDIGIT(Ch)	iswdigit (Ch)
# define HANDLE_REGISTERED_MODIFIER __handle_registered_modifier_wc
#endif

#include "printf-parse.h"

#define NDEBUG 1
#include <assert.h>



/* FORMAT must point to a '%' at the beginning of a spec.  Fills in *SPEC
   with the parsed details.  POSN is the number of arguments already
   consumed.  At most MAXTYPES - POSN types are filled in TYPES.  Return
   the number of args consumed by this spec; *MAX_REF_ARG is updated so it
   remains the highest argument index used.  */
size_t
attribute_hidden
#ifdef COMPILE_WPRINTF
__parse_one_specwc (const UCHAR_T *format, size_t posn,
		    struct printf_spec *spec, size_t *max_ref_arg)
#else
__parse_one_specmb (const UCHAR_T *format, size_t posn,
		    struct printf_spec *spec, size_t *max_ref_arg)
#endif
{
  unsigned int n;
  size_t nargs = 0;

  /* Skip the '%'.  */
  ++format;

  /* Clear information structure.  */
  spec->data_arg = -1;
  spec->info.alt = 0;
  spec->info.space = 0;
  spec->info.left = 0;
  spec->info.showsign = 0;
  spec->info.group = 0;
  spec->info.i18n = 0;
  spec->info.extra = 0;
  spec->info.pad = ' ';
  spec->info.wide = sizeof (UCHAR_T) > 1;

  /* Test for positional argument.  */
  if (ISDIGIT (*format))
    {
      const UCHAR_T *begin = format;

      n = read_int (&format);

      if (n != 0 && *format == L_('$'))
	/* Is positional parameter.  */
	{
	  ++format;		/* Skip the '$'.  */
	  if (n != -1)
	    {
	      spec->data_arg = n - 1;
	      *max_ref_arg = MAX (*max_ref_arg, n);
	    }
	}
      else
	/* Oops; that was actually the width and/or 0 padding flag.
	   Step back and read it again.  */
	format = begin;
    }

  /* Check for spec modifiers.  */
  do
    {
      switch (*format)
	{
	case L_(' '):
	  /* Output a space in place of a sign, when there is no sign.  */
	  spec->info.space = 1;
	  continue;
	case L_('+'):
	  /* Always output + or - for numbers.  */
	  spec->info.showsign = 1;
	  continue;
	case L_('-'):
	  /* Left-justify things.  */
	  spec->info.left = 1;
	  continue;
	case L_('#'):
	  /* Use the "alternate form":
	     Hex has 0x or 0X, FP always has a decimal point.  */
	  spec->info.alt = 1;
	  continue;
	case L_('0'):
	  /* Pad with 0s.  */
	  spec->info.pad = '0';
	  continue;
	case L_('\''):
	  /* Show grouping in numbers if the locale information
	     indicates any.  */
	  spec->info.group = 1;
	  continue;
	case L_('I'):
	  /* Use the internationalized form of the output.  Currently
	     means to use the `outdigits' of the current locale.  */
	  spec->info.i18n = 1;
	  continue;
	default:
	  break;
	}
      break;
    }
  while (*++format);

  if (spec->info.left)
    spec->info.pad = ' ';

  /* Get the field width.  */
  spec->width_arg = -1;
  spec->info.width = 0;
  if (*format == L_('*'))
    {
      /* The field width is given in an argument.
	 A negative field width indicates left justification.  */
      const UCHAR_T *begin = ++format;

      if (ISDIGIT (*format))
	{
	  /* The width argument might be found in a positional parameter.  */
	  n = read_int (&format);

	  if (n != 0 && *format == L_('$'))
	    {
	      if (n != -1)
		{
		  spec->width_arg = n - 1;
		  *max_ref_arg = MAX (*max_ref_arg, n);
		}
	      ++format;		/* Skip '$'.  */
	    }
	}

      if (spec->width_arg < 0)
	{
	  /* Not in a positional parameter.  Consume one argument.  */
	  spec->width_arg = posn++;
	  ++nargs;
	  format = begin;	/* Step back and reread.  */
	}
    }
  else if (ISDIGIT (*format))
    {
      int n = read_int (&format);

      /* Constant width specification.  */
      if (n != -1)
	spec->info.width = n;
    }
  /* Get the precision.  */
  spec->prec_arg = -1;
  /* -1 means none given; 0 means explicit 0.  */
  spec->info.prec = -1;
  if (*format == L_('.'))
    {
      ++format;
      if (*format == L_('*'))
	{
	  /* The precision is given in an argument.  */
	  const UCHAR_T *begin = ++format;

	  if (ISDIGIT (*format))
	    {
	      n = read_int (&format);

	      if (n != 0 && *format == L_('$'))
		{
		  if (n != -1)
		    {
		      spec->prec_arg = n - 1;
		      *max_ref_arg = MAX (*max_ref_arg, n);
		    }
		  ++format;
		}
	    }

	  if (spec->prec_arg < 0)
	    {
	      /* Not in a positional parameter.  */
	      spec->prec_arg = posn++;
	      ++nargs;
	      format = begin;
	    }
	}
      else if (ISDIGIT (*format))
	{
	  int n = read_int (&format);

	  if (n != -1)
	    spec->info.prec = n;
	}
      else
	/* "%.?" is treated like "%.0?".  */
	spec->info.prec = 0;
    }

  /* Check for type modifiers.  */
  spec->info.is_long_double = 0;
  spec->info.is_short = 0;
  spec->info.is_long = 0;
  spec->info.is_char = 0;
  spec->info.user = 0;

  if (__builtin_expect (__printf_modifier_table == NULL, 1)
      || __printf_modifier_table[*format] == NULL
      || HANDLE_REGISTERED_MODIFIER (&format, &spec->info) != 0)
    switch (*format++)
      {
      case L_('h'):
	/* ints are short ints or chars.  */
	if (*format != L_('h'))
	  spec->info.is_short = 1;
	else
	  {
	    ++format;
	    spec->info.is_char = 1;
	  }
	break;
      case L_('l'):
	/* ints are long ints.  */
	spec->info.is_long = 1;
	if (*format != L_('l'))
	  break;
	++format;
	/* FALLTHROUGH */
      case L_('L'):
	/* doubles are long doubles, and ints are long long ints.  */
      case L_('q'):
	/* 4.4 uses this for long long.  */
	spec->info.is_long_double = 1;
	break;
      case L_('z'):
      case L_('Z'):
	/* ints are size_ts.  */
	assert (sizeof (size_t) <= sizeof (unsigned long long int));
#if LONG_MAX != LONG_LONG_MAX
	spec->info.is_long_double = (sizeof (size_t)
				     > sizeof (unsigned long int));
#endif
	spec->info.is_long = sizeof (size_t) > sizeof (unsigned int);
	break;
      case L_('t'):
	assert (sizeof (ptrdiff_t) <= sizeof (long long int));
#if LONG_MAX != LONG_LONG_MAX
	spec->info.is_long_double = (sizeof (ptrdiff_t) > sizeof (long int));
#endif
	spec->info.is_long = sizeof (ptrdiff_t) > sizeof (int);
	break;
      case L_('j'):
	assert (sizeof (uintmax_t) <= sizeof (unsigned long long int));
#if LONG_MAX != LONG_LONG_MAX
	spec->info.is_long_double = (sizeof (uintmax_t)
				     > sizeof (unsigned long int));
#endif
	spec->info.is_long = sizeof (uintmax_t) > sizeof (unsigned int);
	break;
      default:
	/* Not a recognized modifier.  Backup.  */
	--format;
	break;
      }

  /* Get the format specification.  */
  spec->info.spec = (wchar_t) *format++;
  spec->size = -1;
  if (__builtin_expect (__printf_function_table == NULL, 1)
      || spec->info.spec > UCHAR_MAX
      || __printf_arginfo_table[spec->info.spec] == NULL
      /* We don't try to get the types for all arguments if the format
	 uses more than one.  The normal case is covered though.  If
	 the call returns -1 we continue with the normal specifiers.  */
      || (int) (spec->ndata_args = (*__printf_arginfo_table[spec->info.spec])
				   (&spec->info, 1, &spec->data_arg_type,
				    &spec->size)) < 0)
    {
      /* Find the data argument types of a built-in spec.  */
      spec->ndata_args = 1;

      switch (spec->info.spec)
	{
	case L'i':
	case L'd':
	case L'u':
	case L'o':
	case L'X':
	case L'x':
#if LONG_MAX != LONG_LONG_MAX
	  if (spec->info.is_long_double)
	    spec->data_arg_type = PA_INT|PA_FLAG_LONG_LONG;
	  else
#endif
	    if (spec->info.is_long)
	      spec->data_arg_type = PA_INT|PA_FLAG_LONG;
	    else if (spec->info.is_short)
	      spec->data_arg_type = PA_INT|PA_FLAG_SHORT;
	    else if (spec->info.is_char)
	      spec->data_arg_type = PA_CHAR;
	    else
	      spec->data_arg_type = PA_INT;
	  break;
	case L'e':
	case L'E':
	case L'f':
	case L'F':
	case L'g':
	case L'G':
	case L'a':
	case L'A':
	  if (spec->info.is_long_double)
	    spec->data_arg_type = PA_DOUBLE|PA_FLAG_LONG_DOUBLE;
	  else
	    spec->data_arg_type = PA_DOUBLE;
	  break;
	case L'c':
	  spec->data_arg_type = PA_CHAR;
	  break;
	case L'C':
	  spec->data_arg_type = PA_WCHAR;
	  break;
	case L's':
	  spec->data_arg_type = PA_STRING;
	  break;
	case L'S':
	  spec->data_arg_type = PA_WSTRING;
	  break;
	case L'p':
	  spec->data_arg_type = PA_POINTER;
	  break;
	case L'n':
	  spec->data_arg_type = PA_INT|PA_FLAG_PTR;
	  break;

	case L'm':
	default:
	  /* An unknown spec will consume no args.  */
	  spec->ndata_args = 0;
	  break;
	}
    }

  if (spec->data_arg == -1 && spec->ndata_args > 0)
    {
      /* There are args consumed, but no positional spec.  Use the
	 next sequential arg position.  */
      spec->data_arg = posn;
      nargs += spec->ndata_args;
    }

  if (spec->info.spec == L'\0')
    /* Format ended before this spec was complete.  */
    spec->end_of_fmt = spec->next_fmt = format - 1;
  else
    {
      /* Find the next format spec.  */
      spec->end_of_fmt = format;
#ifdef COMPILE_WPRINTF
      spec->next_fmt = __find_specwc (format);
#else
      spec->next_fmt = __find_specmb (format);
#endif
    }

  return nargs;
}