1 /*
2 * Copyright (c) 1990, 2007 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * and/or other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Berkeley. The name of the
11 * University may not be used to endorse or promote products derived
12 * from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16 */
17
18 /*
19 FUNCTION
20 <<swprintf>>, <<fwprintf>>, <<wprintf>>---wide character format output
21
22 INDEX
23 fwprintf
24 INDEX
25 _fwprintf_r
26 INDEX
27 wprintf
28 INDEX
29 _wprintf_r
30 INDEX
31 swprintf
32 INDEX
33 _swprintf_r
34
35 SYNOPSIS
36 #include <wchar.h>
37
38 int wprintf(const wchar_t *<[format]>, ...);
39 int fwprintf(FILE *__restrict <[fd]>,
40 const wchar_t *__restrict <[format]>, ...);
41 int swprintf(wchar_t *__restrict <[str]>, size_t <[size]>,
42 const wchar_t *__restrict <[format]>, ...);
43
44 int wprintf( const wchar_t *<[format]>, ...);
45 int fwprintf( FILE *<[fd]>,
46 const wchar_t *<[format]>, ...);
47 int swprintf( wchar_t *<[str]>,
48 size_t <[size]>, const wchar_t *<[format]>, ...);
49
50 DESCRIPTION
51 <<wprintf>> accepts a series of arguments, applies to each a
52 format specifier from <<*<[format]>>>, and writes the
53 formatted data to <<stdout>>, without a terminating NUL
54 wide character. The behavior of <<wprintf>> is undefined if there
55 are not enough arguments for the format or if any argument is not the
56 right type for the corresponding conversion specifier. <<wprintf>>
57 returns when it reaches the end of the format string. If there are
58 more arguments than the format requires, excess arguments are
59 ignored.
60
61 <<fwprintf>> is like <<wprintf>>, except that output is directed
62 to the stream <[fd]> rather than <<stdout>>.
63
64 <<swprintf>> is like <<wprintf>>, except that output is directed
65 to the buffer <[str]> with a terminating wide <<NUL>>, and the
66 resulting string length is limited to at most <[size]> wide characters,
67 including the terminating <<NUL>>. It is considered an error if the
68 output (including the terminating wide-<<NULL>>) does not fit into
69 <[size]> wide characters. (This error behavior is not the same as for
70 <<snprintf>>, which <<swprintf>> is otherwise completely analogous to.
71 While <<snprintf>> allows the needed size to be known simply by giving
72 <[size]>=0, <<swprintf>> does not, giving an error instead.)
73
74 For <<swprintf>> the behavior is undefined if the output
75 <<*<[str]>>> overlaps with one of the arguments. Behavior is also
76 undefined if the argument for <<%n>> within <<*<[format]>>>
77 overlaps another argument.
78
79 <[format]> is a pointer to a wide character string containing two
80 types of objects: ordinary characters (other than <<%>>),
81 which are copied unchanged to the output, and conversion
82 specifications, each of which is introduced by <<%>>. (To
83 include <<%>> in the output, use <<%%>> in the format string.)
84 A conversion specification has the following form:
85
86 . %[<[pos]>][<[flags]>][<[width]>][.<[prec]>][<[size]>]<[type]>
87
88 The fields of the conversion specification have the following
89 meanings:
90
91 O+
92 o <[pos]>
93
94 Conversions normally consume arguments in the order that they
95 are presented. However, it is possible to consume arguments
96 out of order, and reuse an argument for more than one
97 conversion specification (although the behavior is undefined
98 if the same argument is requested with different types), by
99 specifying <[pos]>, which is a decimal integer followed by
100 '$'. The integer must be between 1 and <NL_ARGMAX> from
101 limits.h, and if argument <<%n$>> is requested, all earlier
102 arguments must be requested somewhere within <[format]>. If
103 positional parameters are used, then all conversion
104 specifications except for <<%%>> must specify a position.
105 This positional parameters method is a POSIX extension to the C
106 standard definition for the functions.
107
108 o <[flags]>
109
110 <[flags]> is an optional sequence of characters which control
111 output justification, numeric signs, decimal points, trailing
112 zeros, and octal and hex prefixes. The flag characters are
113 minus (<<->>), plus (<<+>>), space ( ), zero (<<0>>), sharp
114 (<<#>>), and quote (<<'>>). They can appear in any
115 combination, although not all flags can be used for all
116 conversion specification types.
117
118 o+
119 o '
120 A POSIX extension to the C standard. However, this
121 implementation presently treats it as a no-op, which
122 is the default behavior for the C locale, anyway. (If
123 it did what it is supposed to, when <[type]> were <<i>>,
124 <<d>>, <<u>>, <<f>>, <<F>>, <<g>>, or <<G>>, the
125 integer portion of the conversion would be formatted
126 with thousands' grouping wide characters.)
127
128 o -
129 The result of the conversion is left
130 justified, and the right is padded with
131 blanks. If you do not use this flag, the
132 result is right justified, and padded on the
133 left.
134
135 o +
136 The result of a signed conversion (as
137 determined by <[type]> of <<d>>, <<i>>, <<a>>,
138 <<A>>, <<e>>, <<E>>, <<f>>, <<F>>, <<g>>, or
139 <<G>>) will always begin with a plus or minus
140 sign. (If you do not use this flag, positive
141 values do not begin with a plus sign.)
142
143 o " " (space)
144 If the first character of a signed conversion
145 specification is not a sign, or if a signed
146 conversion results in no characters, the
147 result will begin with a space. If the space
148 ( ) flag and the plus (<<+>>) flag both
149 appear, the space flag is ignored.
150
151 o 0
152 If the <[type]> character is <<d>>, <<i>>,
153 <<o>>, <<u>>, <<x>>, <<X>>, <<a>>, <<A>>,
154 <<e>>, <<E>>, <<f>>, <<F>>, <<g>>, or <<G>>: leading
155 zeros are used to pad the field width
156 (following any indication of sign or base); no
157 spaces are used for padding. If the zero
158 (<<0>>) and minus (<<->>) flags both appear,
159 the zero (<<0>>) flag will be ignored. For
160 <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, and <<X>>
161 conversions, if a precision <[prec]> is
162 specified, the zero (<<0>>) flag is ignored.
163
164 Note that <<0>> is interpreted as a flag, not
165 as the beginning of a field width.
166
167 o #
168 The result is to be converted to an
169 alternative form, according to the <[type]>
170 character.
171 o-
172
173 The alternative form output with the # flag depends on the <[type]>
174 character:
175
176 o+
177 o o
178 Increases precision to force the first
179 digit of the result to be a zero.
180
181 o x
182 A non-zero result will have a <<0x>>
183 prefix.
184
185 o X
186 A non-zero result will have a <<0X>>
187 prefix.
188
189 o a, A, e, E, f, or F
190 The result will always contain a
191 decimal point even if no digits follow
192 the point. (Normally, a decimal point
193 appears only if a digit follows it.)
194 Trailing zeros are removed.
195
196 o g or G
197 The result will always contain a
198 decimal point even if no digits follow
199 the point. Trailing zeros are not
200 removed.
201
202 o all others
203 Undefined.
204
205 o-
206
207
208 o <[width]>
209
210 <[width]> is an optional minimum field width. You can
211 either specify it directly as a decimal integer, or
212 indirectly by using instead an asterisk (<<*>>), in
213 which case an <<int>> argument is used as the field
214 width. If positional arguments are used, then the
215 width must also be specified positionally as <<*m$>>,
216 with m as a decimal integer. Negative field widths
217 are treated as specifying the minus (<<->>) flag for
218 left justfication, along with a positive field width.
219 The resulting format may be wider than the specified
220 width.
221
222 o <[prec]>
223
224 <[prec]> is an optional field; if present, it is
225 introduced with `<<.>>' (a period). You can specify
226 the precision either directly as a decimal integer or
227 indirectly by using an asterisk (<<*>>), in which case
228 an <<int>> argument is used as the precision. If
229 positional arguments are used, then the precision must
230 also be specified positionally as <<*m$>>, with m as a
231 decimal integer. Supplying a negative precision is
232 equivalent to omitting the precision. If only a
233 period is specified the precision is zero. The effect
234 depends on the conversion <[type]>.
235
236 o+
237 o d, i, o, u, x, or X
238 Minimum number of digits to appear. If no
239 precision is given, defaults to 1.
240
241 o a or A
242 Number of digits to appear after the decimal
243 point. If no precision is given, the
244 precision defaults to the minimum needed for
245 an exact representation.
246
247 o e, E, f or F
248 Number of digits to appear after the decimal
249 point. If no precision is given, the
250 precision defaults to 6.
251
252 o g or G
253 Maximum number of significant digits. A
254 precision of 0 is treated the same as a
255 precision of 1. If no precision is given, the
256 precision defaults to 6.
257
258 o s or S
259 Maximum number of characters to print from the
260 string. If no precision is given, the entire
261 string is printed.
262
263 o all others
264 undefined.
265
266 o-
267
268 o <[size]>
269
270 <[size]> is an optional modifier that changes the data
271 type that the corresponding argument has. Behavior is
272 unspecified if a size is given that does not match the
273 <[type]>.
274
275 o+
276 o hh
277 With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
278 <<X>>, specifies that the argument should be
279 converted to a <<signed char>> or <<unsigned
280 char>> before printing.
281
282 With <<n>>, specifies that the argument is a
283 pointer to a <<signed char>>.
284
285 o h
286 With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
287 <<X>>, specifies that the argument should be
288 converted to a <<short>> or <<unsigned short>>
289 before printing.
290
291 With <<n>>, specifies that the argument is a
292 pointer to a <<short>>.
293
294 o l
295 With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
296 <<X>>, specifies that the argument is a
297 <<long>> or <<unsigned long>>.
298
299 With <<c>>, specifies that the argument has
300 type <<wint_t>>.
301
302 With <<s>>, specifies that the argument is a
303 pointer to <<wchar_t>>.
304
305 With <<n>>, specifies that the argument is a
306 pointer to a <<long>>.
307
308 With <<a>>, <<A>>, <<e>>, <<E>>, <<f>>, <<F>>,
309 <<g>>, or <<G>>, has no effect (because of
310 vararg promotion rules, there is no need to
311 distinguish between <<float>> and <<double>>).
312
313 o ll
314 With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
315 <<X>>, specifies that the argument is a
316 <<long long>> or <<unsigned long long>>.
317
318 With <<n>>, specifies that the argument is a
319 pointer to a <<long long>>.
320
321 o j
322 With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
323 <<X>>, specifies that the argument is an
324 <<intmax_t>> or <<uintmax_t>>.
325
326 With <<n>>, specifies that the argument is a
327 pointer to an <<intmax_t>>.
328
329 o z
330 With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
331 <<X>>, specifies that the argument is a <<size_t>>.
332
333 With <<n>>, specifies that the argument is a
334 pointer to a <<size_t>>.
335
336 o t
337 With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
338 <<X>>, specifies that the argument is a
339 <<ptrdiff_t>>.
340
341 With <<n>>, specifies that the argument is a
342 pointer to a <<ptrdiff_t>>.
343
344 o L
345 With <<a>>, <<A>>, <<e>>, <<E>>, <<f>>, <<F>>,
346 <<g>>, or <<G>>, specifies that the argument
347 is a <<long double>>.
348
349 o-
350
351 o <[type]>
352
353 <[type]> specifies what kind of conversion <<wprintf>>
354 performs. Here is a table of these:
355
356 o+
357 o %
358 Prints the percent character (<<%>>).
359
360 o c
361 If no <<l>> qualifier is present, the int argument shall
362 be converted to a wide character as if by calling
363 the btowc() function and the resulting wide character
364 shall be written. Otherwise, the wint_t argument
365 shall be converted to wchar_t, and written.
366
367 o C
368 Short for <<%lc>>. A POSIX extension to the C standard.
369
370 o s
371 If no <<l>> qualifier is present, the application
372 shall ensure that the argument is a pointer to a
373 character array containing a character sequence
374 beginning in the initial shift state. Characters
375 from the array shall be converted as if by repeated
376 calls to the mbrtowc() function, with the conversion
377 state described by an mbstate_t object initialized to
378 zero before the first character is converted, and
379 written up to (but not including) the terminating
380 null wide character. If the precision is specified,
381 no more than that many wide characters shall be
382 written. If the precision is not specified, or is
383 greater than the size of the array, the application
384 shall ensure that the array contains a null wide
385 character.
386
387 If an <<l>> qualifier is present, the application
388 shall ensure that the argument is a pointer to an
389 array of type wchar_t. Wide characters from the array
390 shall be written up to (but not including) a
391 terminating null wide character. If no precision is
392 specified, or is greater than the size of the array,
393 the application shall ensure that the array contains
394 a null wide character. If a precision is specified,
395 no more than that many wide characters shall be
396 written.
397
398 o S
399 Short for <<%ls>>. A POSIX extension to the C standard.
400
401 o d or i
402 Prints a signed decimal integer; takes an
403 <<int>>. Leading zeros are inserted as
404 necessary to reach the precision. A value of 0 with
405 a precision of 0 produces an empty string.
406
407 o o
408 Prints an unsigned octal integer; takes an
409 <<unsigned>>. Leading zeros are inserted as
410 necessary to reach the precision. A value of 0 with
411 a precision of 0 produces an empty string.
412
413 o u
414 Prints an unsigned decimal integer; takes an
415 <<unsigned>>. Leading zeros are inserted as
416 necessary to reach the precision. A value of 0 with
417 a precision of 0 produces an empty string.
418
419 o x
420 Prints an unsigned hexadecimal integer (using
421 <<abcdef>> as digits beyond <<9>>); takes an
422 <<unsigned>>. Leading zeros are inserted as
423 necessary to reach the precision. A value of 0 with
424 a precision of 0 produces an empty string.
425
426 o X
427 Like <<x>>, but uses <<ABCDEF>> as digits
428 beyond <<9>>.
429
430 o f
431 Prints a signed value of the form
432 <<[-]9999.9999>>, with the precision
433 determining how many digits follow the decimal
434 point; takes a <<double>> (remember that
435 <<float>> promotes to <<double>> as a vararg).
436 The low order digit is rounded to even. If
437 the precision results in at most DECIMAL_DIG
438 digits, the result is rounded correctly; if
439 more than DECIMAL_DIG digits are printed, the
440 result is only guaranteed to round back to the
441 original value.
442
443 If the value is infinite, the result is
444 <<inf>>, and no zero padding is performed. If
445 the value is not a number, the result is
446 <<nan>>, and no zero padding is performed.
447
448 o F
449 Like <<f>>, but uses <<INF>> and <<NAN>> for
450 non-finite numbers.
451
452 o e
453 Prints a signed value of the form
454 <<[-]9.9999e[+|-]999>>; takes a <<double>>.
455 The digit before the decimal point is non-zero
456 if the value is non-zero. The precision
457 determines how many digits appear between
458 <<.>> and <<e>>, and the exponent always
459 contains at least two digits. The value zero
460 has an exponent of zero. If the value is not
461 finite, it is printed like <<f>>.
462
463 o E
464 Like <<e>>, but using <<E>> to introduce the
465 exponent, and like <<F>> for non-finite
466 values.
467
468 o g
469 Prints a signed value in either <<f>> or <<e>>
470 form, based on the given value and
471 precision---an exponent less than -4 or
472 greater than the precision selects the <<e>>
473 form. Trailing zeros and the decimal point
474 are printed only if necessary; takes a
475 <<double>>.
476
477 o G
478 Like <<g>>, except use <<F>> or <<E>> form.
479
480 o a
481 Prints a signed value of the form
482 <<[-]0x1.ffffp[+|-]9>>; takes a <<double>>.
483 The letters <<abcdef>> are used for digits
484 beyond <<9>>. The precision determines how
485 many digits appear after the decimal point.
486 The exponent contains at least one digit, and
487 is a decimal value representing the power of
488 2; a value of 0 has an exponent of 0.
489 Non-finite values are printed like <<f>>.
490
491 o A
492 Like <<a>>, except uses <<X>>, <<P>>, and
493 <<ABCDEF>> instead of lower case.
494
495 o n
496 Takes a pointer to <<int>>, and stores a count
497 of the number of bytes written so far. No
498 output is created.
499
500 o p
501 Takes a pointer to <<void>>, and prints it in
502 an implementation-defined format. This
503 implementation is similar to <<%#tx>>), except
504 that <<0x>> appears even for the NULL pointer.
505
506 o m
507 Prints the output of <<strerror(errno)>>; no
508 argument is required. A GNU extension.
509
510 o-
511 O-
512
513 <<_wprintf_r>>, <<_fwprintf_r>>, <<_swprintf_r>>, are simply
514 reentrant versions of the functions above.
515
516 RETURNS
517 On success, <<swprintf>> return the number of wide characters in
518 the output string, except the concluding <<NUL>> is not counted.
519 <<wprintf>> and <<fwprintf>> return the number of characters transmitted.
520
521 If an error occurs, the result of <<wprintf>>, <<fwprintf>>, and
522 <<swprintf>> is a negative value. For <<wprintf>> and <<fwprintf>>,
523 <<errno>> may be set according to <<fputwc>>. For <<swprintf>>, <<errno>>
524 may be set to EOVERFLOW if <[size]> is greater than INT_MAX / sizeof (wchar_t),
525 or when the output does not fit into <[size]> wide characters (including the
526 terminating wide <<NULL>>).
527
528 BUGS
529 The ``''' (quote) flag does not work when locale's thousands_sep is not empty.
530
531 PORTABILITY
532 POSIX-1.2008 with extensions; C99 (compliant except for POSIX extensions).
533
534 Depending on how newlib was configured, not all format specifiers are
535 supported.
536
537 Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
538 <<lseek>>, <<read>>, <<sbrk>>, <<write>>.
539 */
540
541
542 #define _DEFAULT_SOURCE
543 #include <_ansi.h>
544 #include <stdio.h>
545 #include <wchar.h>
546 #include <stdarg.h>
547 #include <limits.h>
548 #include <errno.h>
549 #include "local.h"
550
551 int
swprintf(wchar_t * __restrict str,size_t size,const wchar_t * __restrict fmt,...)552 swprintf (wchar_t *__restrict str,
553 size_t size,
554 const wchar_t *__restrict fmt, ...)
555 {
556 int ret;
557 va_list ap;
558 FILE f;
559
560 if (size > INT_MAX / sizeof (wchar_t))
561 {
562 _REENT_ERRNO(ptr) = EOVERFLOW; /* POSIX extension */
563 return EOF;
564 }
565 f._flags = __SWR | __SSTR;
566 f._bf._base = f._p = (unsigned char *) str;
567 f._bf._size = f._w = (size > 0 ? (size - 1) * sizeof (wchar_t) : 0);
568 f._file = -1; /* No file. */
569 va_start (ap, fmt);
570 ret = svfwprintf ( &f, fmt, ap);
571 va_end (ap);
572 /* svfwprintf( so add one if
573 * appropriate, which is whenever size is > 0. _svfwprintf_r() stops
574 * after n-1, so always just put at the end. */
575 if (size > 0) {
576 *(wchar_t *)f._p = L'\0'; /* terminate the string */
577 }
578 if(ret >= 0 && (size_t) ret >= size) {
579 /* _svfwprintf_r() returns how many wide characters it would have printed
580 * if there were enough space. Return an error if too big to fit in str,
581 * unlike snprintf, which returns the size needed. */
582 _REENT_ERRNO(ptr) = EOVERFLOW; /* POSIX extension */
583 ret = -1;
584 }
585 return (ret);
586 }
587
