summary refs log tree commit diff
path: root/stdlib/strfmon.c
blob: 28249c1f623bf68e1034a1f188b620ace2f029f5 (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
/* Formatting a monetary value according to the current locale.
   Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>
   and Jochen Hein <Jochen.Hein@informatik.TU-Clausthal.de>, 1996.

   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 <ctype.h>
#include <errno.h>
#include <langinfo.h>
#include <monetary.h>
#ifdef USE_IN_LIBIO
# include "../libio/libioP.h"
# include "../libio/strfile.h"
#endif
#include <printf.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include "../locale/localeinfo.h"


#define out_char(Ch)							      \
  do {									      \
    if (dest >= s + maxsize - 1)					      \
      {									      \
	__set_errno (E2BIG);						      \
	va_end (ap);							      \
	return -1;							      \
      }									      \
    *dest++ = (Ch);							      \
  } while (0)

#define out_string(String)						      \
  do {									      \
    const char *_s = (String);						      \
    while (*_s)								      \
      out_char (*_s++);							      \
  } while (0)

#define out_nstring(String, N)						      \
  do {									      \
    int _n = (N);							      \
    const char *_s = (String);						      \
    while (_n-- > 0)							      \
      out_char (*_s++);							      \
  } while (0)

#define to_digit(Ch) ((Ch) - '0')


/* We use this code also for the extended locale handling where the
   function gets as an additional argument the locale which has to be
   used.  To access the values we have to redefine the _NL_CURRENT
   macro.  */
#ifdef USE_IN_EXTENDED_LOCALE_MODEL
# undef _NL_CURRENT
# define _NL_CURRENT(category, item) \
  (current->values[_NL_ITEM_INDEX (item)].string)
#endif

extern int __printf_fp (FILE *, const struct printf_info *,
			const void **const);
/* This function determines the number of digit groups in the output.
   The definition is in printf_fp.c.  */
extern unsigned int __guess_grouping (unsigned int intdig_max,
				      const char *grouping, wchar_t sepchar);


/* We have to overcome some problems with this implementation.  On the
   one hand the strfmon() function is specified in XPG4 and of course
   it has to follow this.  But on the other hand POSIX.2 specifies
   some information in the LC_MONETARY category which should be used,
   too.  Some of the information contradicts the information which can
   be specified in format string.  */
#ifndef USE_IN_EXTENDED_LOCALE_MODEL
ssize_t
strfmon (char *s, size_t maxsize, const char *format, ...)
#else
ssize_t
__strfmon_l (char *s, size_t maxsize, __locale_t loc, const char *format, ...)
#endif
{
#ifdef USE_IN_EXTENDED_LOCALE_MODEL
  struct locale_data *current = loc->__locales[LC_MONETARY];
#endif
#ifdef USE_IN_LIBIO
  _IO_strfile f;
#else
  FILE f;
#endif
  struct printf_info info;
  va_list ap;			/* Scan through the varargs.  */
  char *dest;			/* Pointer so copy the output.  */
  const char *fmt;		/* Pointer that walks through format.  */

  va_start (ap, format);

  dest = s;
  fmt = format;

  /* Loop through the format-string.  */
  while (*fmt != '\0')
    {
      /* The floating-point value to output.  */
      union
      {
	double dbl;
	__long_double_t ldbl;
      }
      fpnum;
      int print_curr_symbol;
      int left_prec;
      int left_pad;
      int right_prec;
      int group;
      char pad;
      int is_long_double;
      int p_sign_posn;
      int n_sign_posn;
      int sign_posn;
      int other_sign_posn;
      int left;
      int is_negative;
      int sep_by_space;
      int other_sep_by_space;
      int cs_precedes;
      int other_cs_precedes;
      const char *sign_string;
      const char *other_sign_string;
      int done;
      const char *currency_symbol;
      size_t currency_symbol_len;
      int width;
      char *startp;
      const void *ptr;
      char space_char;

      /* Process all character which do not introduce a format
	 specification.  */
      if (*fmt != '%')
	{
	  out_char (*fmt++);
	  continue;
	}

      /* "%%" means a single '%' character.  */
      if (fmt[1] == '%')
	{
	  out_char (*++fmt);
	  ++fmt;
	  continue;
	}

      /* Defaults for formatting.  */
      print_curr_symbol = 1;		/* Print the currency symbol.  */
      left_prec = -1;			/* No left precision specified.  */
      right_prec = -1;			/* No right precision specified.  */
      group = 1;			/* Print digits grouped.  */
      pad = ' ';			/* Fill character is <SP>.  */
      is_long_double = 0;		/* Double argument by default.  */
      p_sign_posn = -1;			/* This indicates whether the */
      n_sign_posn = -1;			/* '(' flag is given.  */
      width = -1;			/* No width specified so far.  */
      left = 0;				/* Right justified by default.  */

      /* Parse group characters.  */
      while (1)
	{
	  switch (*++fmt)
	    {
	    case '=':			/* Set fill character.  */
	      pad = *++fmt;
	      if (pad == '\0')
		{
		  /* Premature EOS.  */
		  __set_errno (EINVAL);
		  va_end (ap);
		  return -1;
		}
	      continue;
	    case '^':			/* Don't group digits.  */
	      group = 0;
	      continue;
	    case '+':			/* Use +/- for sign of number.  */
	      if (n_sign_posn != -1)
		{
		  __set_errno (EINVAL);
		  va_end (ap);
		  return -1;
		}
	      p_sign_posn = *_NL_CURRENT (LC_MONETARY, P_SIGN_POSN);
	      n_sign_posn = *_NL_CURRENT (LC_MONETARY, N_SIGN_POSN);
	      continue;
	    case '(':			/* Use ( ) for negative sign.  */
	      if (n_sign_posn != -1)
		{
		  __set_errno (EINVAL);
		  va_end (ap);
		  return -1;
		}
	      p_sign_posn = 0;
	      n_sign_posn = 0;
	      continue;
	    case '!':			/* Don't print the currency symbol.  */
	      print_curr_symbol = 0;
	      continue;
	    case '-':			/* Print left justified.  */
	      left = 1;
	      continue;
	    default:
	      /* Will stop the loop.  */;
	    }
	  break;
	}

      /* If not specified by the format string now find the values for
	 the format specification.  */
      if (p_sign_posn == -1)
	p_sign_posn = *_NL_CURRENT (LC_MONETARY, P_SIGN_POSN);
      if (n_sign_posn == -1)
	n_sign_posn = *_NL_CURRENT (LC_MONETARY, N_SIGN_POSN);

      if (isdigit (*fmt))
	{
	  /* Parse field width.  */
	  width = to_digit (*fmt);

	  while (isdigit (*++fmt))
	    {
	      width *= 10;
	      width += to_digit (*fmt);
	    }

	  /* If we don't have enough room for the demanded width we
	     can stop now and return an error.  */
	  if (dest + width >= s + maxsize)
	    {
	      __set_errno (E2BIG);
	      va_end (ap);
	      return -1;
	    }
	}

      /* Recognize left precision.  */
      if (*fmt == '#')
	{
	  if (!isdigit (*++fmt))
	    {
	      __set_errno (EINVAL);
	      va_end (ap);
	      return -1;
	    }
	  left_prec = to_digit (*fmt);

	  while (isdigit (*++fmt))
	    {
	      left_prec *= 10;
	      left_prec += to_digit (*fmt);
	    }
	}

      /* Recognize right precision.  */
      if (*fmt == '.')
	{
	  if (!isdigit (*++fmt))
	    {
	      __set_errno (EINVAL);
	      va_end (ap);
	      return -1;
	    }
	  right_prec = to_digit (*fmt);

	  while (isdigit (*++fmt))
	    {
	      right_prec *= 10;
	      right_prec += to_digit (*fmt);
	    }
	}

      /* Handle modifier.  This is an extension.  */
      if (*fmt == 'L')
	{
	  ++fmt;
	  is_long_double = 1;
	}

      /* Handle format specifier.  */
      switch (*fmt++)
	{
	case 'i':		/* Use international currency symbol.  */
	  currency_symbol = _NL_CURRENT (LC_MONETARY, INT_CURR_SYMBOL);
	  currency_symbol_len = 3;
	  space_char = currency_symbol[3];
	  if (right_prec == -1)
	    {
	      if (*_NL_CURRENT (LC_MONETARY, INT_FRAC_DIGITS) == CHAR_MAX)
		right_prec = 2;
	      else
		right_prec = *_NL_CURRENT (LC_MONETARY, INT_FRAC_DIGITS);
	    }
	  break;
	case 'n':		/* Use national currency symbol.  */
	  currency_symbol = _NL_CURRENT (LC_MONETARY, CURRENCY_SYMBOL);
	  currency_symbol_len = strlen (currency_symbol);
	  space_char = ' ';
	  if (right_prec == -1)
	    {
	      if (*_NL_CURRENT (LC_MONETARY, FRAC_DIGITS) == CHAR_MAX)
		right_prec = 2;
	      else
		right_prec = *_NL_CURRENT (LC_MONETARY, FRAC_DIGITS);
	    }
	  break;
	default:		/* Any unrecognized format is an error.  */
	  __set_errno (EINVAL);
	  va_end (ap);
	  return -1;
	}

      /* If we have to print the digits grouped determine how many
	 extra characters this means.  */
      if (group && left_prec != -1)
	left_prec += __guess_grouping (left_prec,
				       _NL_CURRENT (LC_MONETARY, MON_GROUPING),
				       *_NL_CURRENT (LC_MONETARY,
						     MON_THOUSANDS_SEP));

      /* Now it's time to get the value.  */
      if (is_long_double == 1)
	{
	  fpnum.ldbl = va_arg (ap, long double);
	  is_negative = fpnum.ldbl < 0;
	  if (is_negative)
	    fpnum.ldbl = -fpnum.ldbl;
	}
      else
	{
	  fpnum.dbl = va_arg (ap, double);
	  is_negative = fpnum.dbl < 0;
	  if (is_negative)
	    fpnum.dbl = -fpnum.dbl;
	}

      /* We now know the sign of the value and can determine the format.  */
      if (is_negative)
	{
	  sign_string = _NL_CURRENT (LC_MONETARY, NEGATIVE_SIGN);
	  /* If the locale does not specify a character for the
	     negative sign we use a '-'.  */
	  if (*sign_string == '\0')
	    sign_string = (const char *) "-";
	  cs_precedes = *_NL_CURRENT (LC_MONETARY, N_CS_PRECEDES);
	  sep_by_space = *_NL_CURRENT (LC_MONETARY, N_SEP_BY_SPACE);
	  sign_posn = n_sign_posn;

	  other_sign_string = _NL_CURRENT (LC_MONETARY, POSITIVE_SIGN);
	  other_cs_precedes = *_NL_CURRENT (LC_MONETARY, P_CS_PRECEDES);
	  other_sep_by_space = *_NL_CURRENT (LC_MONETARY, P_SEP_BY_SPACE);
	  other_sign_posn = p_sign_posn;
	}
      else
	{
	  sign_string = _NL_CURRENT (LC_MONETARY, POSITIVE_SIGN);
	  cs_precedes = *_NL_CURRENT (LC_MONETARY, P_CS_PRECEDES);
	  sep_by_space = *_NL_CURRENT (LC_MONETARY, P_SEP_BY_SPACE);
	  sign_posn = p_sign_posn;

	  other_sign_string = _NL_CURRENT (LC_MONETARY, NEGATIVE_SIGN);
	  if (*other_sign_string == '\0')
	    other_sign_string = (const char *) "-";
	  other_cs_precedes = *_NL_CURRENT (LC_MONETARY, N_CS_PRECEDES);
	  other_sep_by_space = *_NL_CURRENT (LC_MONETARY, N_SEP_BY_SPACE);
	  other_sign_posn = n_sign_posn;
	}

      /* Set default values for unspecified information.  */
      if (cs_precedes != 0)
	cs_precedes = 1;
      if (other_cs_precedes != 0)
	other_cs_precedes = 1;
      if (sep_by_space == CHAR_MAX)
	sep_by_space = 0;
      if (other_sep_by_space == CHAR_MAX)
	other_sep_by_space = 0;
      if (sign_posn == CHAR_MAX)
	sign_posn = 1;
      if (other_sign_posn == CHAR_MAX)
	other_sign_posn = 1;

      /* Check for degenerate cases */
      if (sep_by_space == 2)
	{
	  if (sign_posn == 0 ||
	      (sign_posn == 1 && !cs_precedes) ||
	      (sign_posn == 2 && cs_precedes))
	    /* sign and symbol are not adjacent, so no separator */
	    sep_by_space = 0;
	}
      if (other_sep_by_space == 2)
	{
	  if (other_sign_posn == 0 ||
	      (other_sign_posn == 1 && !other_cs_precedes) ||
	      (other_sign_posn == 2 && other_cs_precedes))
	    /* sign and symbol are not adjacent, so no separator */
	    other_sep_by_space = 0;
	}

      /* Set the left precision and padding needed for alignment */
      if (left_prec == -1)
	{
	  left_prec = 0;
	  left_pad = 0;
	}
      else
	{
	  /* Set left_pad to number of spaces needed to align positive
	     and negative formats */

	  int left_bytes = 0;
	  int other_left_bytes = 0;

	  /* Work out number of bytes for currency string and separator
	     preceding the value */
	  if (cs_precedes)
	    {
	      left_bytes += currency_symbol_len;
	      if (sep_by_space != 0)
		++left_bytes;
	    }

	  if (other_cs_precedes)
	    {
	      other_left_bytes += currency_symbol_len;
	      if (other_sep_by_space != 0)
		++other_left_bytes;
	    }

	  /* Work out number of bytes for the sign (or left parenthesis)
	     preceding the value */
	  if (sign_posn == 0 && is_negative)
	    ++left_bytes;
	  else if (sign_posn == 1)
	    left_bytes += strlen (sign_string);
	  else if (cs_precedes && (sign_posn == 3 || sign_posn == 4))
	    left_bytes += strlen (sign_string);

	  if (other_sign_posn == 0 && !is_negative)
	    ++other_left_bytes;
	  else if (other_sign_posn == 1)
	    other_left_bytes += strlen (other_sign_string);
	  else if (other_cs_precedes &&
		   (other_sign_posn == 3 || other_sign_posn == 4))
	    other_left_bytes += strlen (other_sign_string);

	  /* Compare the number of bytes preceding the value for
	     each format, and set the padding accordingly */
	  if (other_left_bytes > left_bytes)
	    left_pad = other_left_bytes - left_bytes;
	  else
	    left_pad = 0;
	}

      /* Perhaps we'll someday make these things configurable so
	 better start using symbolic names now.  */
#define left_paren '('
#define right_paren ')'

      startp = dest;		/* Remember start so we can compute length.  */

      while (left_pad-- > 0)
	out_char (' ');

      if (sign_posn == 0 && is_negative)
	out_char (left_paren);

      if (cs_precedes)
	{
	  if (sign_posn != 0 && sign_posn != 2 && sign_posn != 4
	      && sign_posn != 5)
	    {
	      out_string (sign_string);
	      if (sep_by_space == 2)
		out_char (' ');
	    }

	  if (print_curr_symbol)
	    {
	      out_string (currency_symbol);

	      if (sign_posn == 4)
		{
		  if (sep_by_space == 2)
		    out_char (space_char);
		  out_string (sign_string);
		  if (sep_by_space == 1)
		    /* POSIX.2 and SUS are not clear on this case, but C99
		       says a space follows the adjacent-symbol-and-sign */
		    out_char (' ');
		}
	      else
		if (sep_by_space == 1)
		  out_char (space_char);
	    }
	}
      else
	if (sign_posn != 0 && sign_posn != 2 && sign_posn != 3
	    && sign_posn != 4 && sign_posn != 5)
	  out_string (sign_string);

      /* Print the number.  */
#ifdef USE_IN_LIBIO
      _IO_init ((_IO_FILE *) &f, 0);
      _IO_JUMPS ((struct _IO_FILE_plus *) &f) = &_IO_str_jumps;
      _IO_str_init_static ((_IO_strfile *) &f, dest, (s + maxsize) - dest, dest);
#else
      memset ((void *) &f, 0, sizeof (f));
      f.__magic = _IOMAGIC;
      f.__mode.__write = 1;
      /* The buffer size is one less than MAXLEN
	 so we have space for the null terminator.  */
      f.__bufp = f.__buffer = (char *) dest;
      f.__bufsize = (s + maxsize) - dest;
      f.__put_limit = f.__buffer + f.__bufsize;
      f.__get_limit = f.__buffer;
      /* After the buffer is full (MAXLEN characters have been written),
	 any more characters written will go to the bit bucket.  */
      f.__room_funcs = __default_room_functions;
      f.__io_funcs.__write = NULL;
      f.__seen = 1;
#endif
      /* We clear the last available byte so we can find out whether
	 the numeric representation is too long.  */
      s[maxsize - 1] = '\0';

      info.prec = right_prec;
      info.width = left_prec + (right_prec ? (right_prec + 1) : 0);
      info.spec = 'f';
      info.is_long_double = is_long_double;
      info.is_short = 0;
      info.is_long = 0;
      info.alt = 0;
      info.space = 0;
      info.left = left;
      info.showsign = 0;
      info.group = group;
      info.pad = pad;
      info.extra = 1;		/* This means use values from LC_MONETARY.  */
      info.wide = 0;

      ptr = &fpnum;
      done = __printf_fp ((FILE *) &f, &info, &ptr);
      if (done < 0)
	{
	  va_end (ap);
	  return -1;
	}

      if (s[maxsize - 1] != '\0')
	{
	  __set_errno (E2BIG);
	  return -1;
	}

      dest += done;

      if (!cs_precedes)
	{
	  if (sign_posn == 3)
	    {
	      if (sep_by_space == 1)
		out_char (' ');
	      out_string (sign_string);
	    }

	  if (print_curr_symbol)
	    {
	      if ((sign_posn == 3 && sep_by_space == 2)
		  || (sign_posn == 4 && sep_by_space == 1)
		  || (sign_posn == 2 && sep_by_space == 1)
		  || (sign_posn == 1 && sep_by_space == 1)
		  || (sign_posn == 0 && sep_by_space == 1))
		out_char (space_char);
	      out_nstring (currency_symbol, currency_symbol_len);
	      if (sign_posn == 4)
		{
		  if (sep_by_space == 2)
		    out_char (' ');
		  out_string (sign_string);
		}
	    }
	}

      if (sign_posn == 2)
	{
	  if (sep_by_space == 2)
	    out_char (' ');
	  out_string (sign_string);
	}

      if (sign_posn == 0 && is_negative)
	out_char (right_paren);

      /* Now test whether the output width is filled.  */
      if (dest - startp < width)
	{
	  if (left)
	    /* We simply have to fill using spaces.  */
	    do
	      out_char (' ');
	    while (dest - startp < width);
	  else
	    {
	      int dist = width - (dest - startp);
	      char *cp;
	      for (cp = dest - 1; cp >= startp; --cp)
		cp[dist] = cp[0];

	      dest += dist;

	      do
		startp[--dist] = ' ';
	      while (dist > 0);
	    }
	}
    }

  /* Terminate the string.  */
  *dest = '\0';

  va_end (ap);

  return dest - s;
}