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import less(1)
[unleashed/tickless.git] / usr / src / lib / libc / port / locale / strfmon.c
bloba875b9be1a588fc3d87bc0cb47c790f01c3c3765
1 /*
2 * Copyright 2013 Garrett D'Amore <garrett@damore.org>
3 * Copyright 2010 Nexenta Systems, Inc. All rights reserved.
4 * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29
30 #ifndef _LCONV_C99
31 #define _LCONV_C99
32 #endif
33
34 #include "lint.h"
35 #include <sys/types.h>
36 #include <ctype.h>
37 #include <errno.h>
38 #include <limits.h>
39 #include <locale.h>
40 #include <monetary.h>
41 #include <stdarg.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include "localeimpl.h"
46 #include "lmonetary.h"
47 #include "lnumeric.h"
48
49 /* internal flags */
50 #define NEED_GROUPING 0x01 /* print digits grouped (default) */
51 #define SIGN_POSN_USED 0x02 /* '+' or '(' usage flag */
52 #define LOCALE_POSN 0x04 /* use locale defined +/- (default) */
53 #define PARENTH_POSN 0x08 /* enclose negative amount in () */
54 #define SUPRESS_CURR_SYMBOL 0x10 /* supress the currency from output */
55 #define LEFT_JUSTIFY 0x20 /* left justify */
56 #define USE_INTL_CURRENCY 0x40 /* use international currency symbol */
57 #define IS_NEGATIVE 0x80 /* is argument value negative ? */
58
59 /* internal macros */
60 #define PRINT(CH) { \
61 if (dst >= s + maxsize) \
62 goto e2big_error; \
63 *dst++ = CH; \
64 }
65
66 #define PRINTS(STR) { \
67 const char *tmps = STR; \
68 while (*tmps != '\0') \
69 PRINT(*tmps++); \
70 }
71
72 #define GET_NUMBER(VAR) { \
73 VAR = 0; \
74 while (isdigit((unsigned char)*fmt)) { \
75 if (VAR > INT_MAX / 10) \
76 goto e2big_error; \
77 VAR *= 10; \
78 VAR += *fmt - '0'; \
79 if (VAR < 0) \
80 goto e2big_error; \
81 fmt++; \
82 } \
83 }
84
85 #define GRPCPY(howmany) { \
86 int i = howmany; \
87 while (i-- > 0) { \
88 avalue_size--; \
89 *--bufend = *(avalue+avalue_size+padded); \
90 } \
91 }
92
93 #define GRPSEP { \
94 bufend -= thousands_len; \
95 (void) memcpy(bufend, thousands_sep, thousands_len); \
96 groups++; \
97 }
98
99 static void setup_vars(const struct lc_monetary *, int, char *, char *, char *,
100 const char **);
101 static int calc_left_pad(const struct lc_monetary *, int, const char *);
102 static char *format_grouped_double(const struct lc_monetary *,
103 const struct lc_numeric *, double, int *, int, int, int);
104
105 ssize_t
106 strfmon_impl(char *_RESTRICT_KYWD s, size_t maxsize, locale_t loc,
107 const char *_RESTRICT_KYWD format, va_list ap)
108 {
109 char *dst; /* output destination pointer */
110 const char *fmt; /* current format poistion pointer */
111 char *asciivalue; /* formatted double pointer */
112
113 int flags; /* formatting options */
114 int pad_char; /* padding character */
115 int pad_size; /* pad size */
116 int width; /* field width */
117 int left_prec; /* left precision */
118 int right_prec; /* right precision */
119 double value; /* just value */
120 char space_char = ' '; /* space after currency */
121
122 char cs_precedes; /* values from struct lc_monetary */
123 char sep_by_space;
124 char sign_posn;
125 const char *signstr;
126 const char *currency_symbol;
127
128 char *tmpptr; /* temporary vars */
129 int sverrno;
130 const struct lc_monetary *lmon; /* monetary structure */
131 const struct lc_numeric *lnum; /* numeric structure */
132
133 lmon = loc->monetary;
134 lnum = loc->numeric;
135
136 dst = s;
137 fmt = format;
138 asciivalue = NULL;
139 currency_symbol = NULL;
140 pad_size = 0;
141
142 while (*fmt) {
143 /* pass nonformating characters AS IS */
144 if (*fmt != '%')
145 goto literal;
146
147 /* '%' found ! */
148
149 /* "%%" mean just '%' */
150 if (*(fmt+1) == '%') {
151 fmt++;
152 literal:
153 PRINT(*fmt++);
154 continue;
155 }
156
157 /* set up initial values */
158 flags = (NEED_GROUPING|LOCALE_POSN);
159 pad_char = ' '; /* padding character is "space" */
160 left_prec = -1; /* no left precision specified */
161 right_prec = -1; /* no right precision specified */
162 width = -1; /* no width specified */
163 value = 0; /* we have no value to print now */
164
165 /* Flags */
166 for (;;) {
167 switch (*++fmt) {
168 case '=': /* fill character */
169 pad_char = *++fmt;
170 if (pad_char == '\0')
171 goto format_error;
172 continue;
173 case '^': /* not group currency */
174 flags &= ~(NEED_GROUPING);
175 continue;
176 case '+': /* use locale defined signs */
177 if (flags & SIGN_POSN_USED)
178 goto format_error;
179 flags |= (SIGN_POSN_USED|LOCALE_POSN);
180 continue;
181 case '(': /* enclose negatives with () */
182 if (flags & SIGN_POSN_USED)
183 goto format_error;
184 flags |= (SIGN_POSN_USED|PARENTH_POSN);
185 continue;
186 case '!': /* suppress currency symbol */
187 flags |= SUPRESS_CURR_SYMBOL;
188 continue;
189 case '-': /* alignment (left) */
190 flags |= LEFT_JUSTIFY;
191 continue;
192 default:
193 break;
194 }
195 break;
196 }
197
198 /* field Width */
199 if (isdigit((unsigned char)*fmt)) {
200 GET_NUMBER(width);
201 /*
202 * Do we have enough space to put number with
203 * required width ?
204 */
205 if ((unsigned int)width >= maxsize - (dst - s))
206 goto e2big_error;
207 }
208
209 /* Left precision */
210 if (*fmt == '#') {
211 if (!isdigit((unsigned char)*++fmt))
212 goto format_error;
213 GET_NUMBER(left_prec);
214 if ((unsigned int)left_prec >= maxsize - (dst - s))
215 goto e2big_error;
216 }
217
218 /* Right precision */
219 if (*fmt == '.') {
220 if (!isdigit((unsigned char)*++fmt))
221 goto format_error;
222 GET_NUMBER(right_prec);
223 if ((unsigned int)right_prec >= maxsize - (dst - s) -
224 left_prec)
225 goto e2big_error;
226 }
227
228 /* Conversion Characters */
229 switch (*fmt++) {
230 case 'i': /* use internaltion currency format */
231 flags |= USE_INTL_CURRENCY;
232 break;
233 case 'n': /* use national currency format */
234 flags &= ~(USE_INTL_CURRENCY);
235 break;
236 default:
237 /* required char missing or premature EOS */
238 goto format_error;
239 }
240
241 if (flags & USE_INTL_CURRENCY) {
242 currency_symbol = lmon->int_curr_symbol;
243 /* by definition three letters followed by a space */
244 if (currency_symbol != NULL)
245 space_char = currency_symbol[3];
246 } else
247 currency_symbol = lmon->currency_symbol;
248
249 /* value itself */
250 value = va_arg(ap, double);
251
252 /* detect sign */
253 if (value < 0) {
254 flags |= IS_NEGATIVE;
255 value = -value;
256 }
257
258 /* fill left_prec with amount of padding chars */
259 if (left_prec >= 0) {
260 pad_size = calc_left_pad(lmon, (flags ^ IS_NEGATIVE),
261 currency_symbol) -
262 calc_left_pad(lmon, flags, currency_symbol);
263 if (pad_size < 0)
264 pad_size = 0;
265 }
266
267 free(asciivalue);
268 asciivalue = format_grouped_double(lmon, lnum, value, &flags,
269 left_prec, right_prec, pad_char);
270 if (asciivalue == NULL)
271 goto end_error; /* errno already set */
272 /* to ENOMEM by malloc() */
273
274 /* set some variables for later use */
275 setup_vars(lmon, flags, &cs_precedes, &sep_by_space,
276 &sign_posn, &signstr);
277
278 /*
279 * Description of some LC_MONETARY's values:
280 *
281 * p_cs_precedes & n_cs_precedes
282 *
283 * = 1 - $currency_symbol precedes the value
284 * for a monetary quantity with a non-negative value
285 * = 0 - symbol succeeds the value
286 *
287 * p_sep_by_space & n_sep_by_space
288 *
289 * = 0 - no space separates $currency_symbol
290 * from the value for a monetary quantity with a
291 * non-negative value
292 * = 1 - space separates the symbol from the value
293 * = 2 - space separates the symbol and the sign string,
294 * if adjacent.
295 *
296 * p_sign_posn & n_sign_posn
297 *
298 * = 0 - parentheses enclose the quantity and the
299 * $currency_symbol
300 * = 1 - the sign string precedes the quantity and the
301 * $currency_symbol
302 * = 2 - the sign string succeeds the quantity and the
303 * $currency_symbol
304 * = 3 - the sign string precedes the $currency_symbol
305 * = 4 - the sign string succeeds the $currency_symbol
306 *
307 */
308
309 tmpptr = dst;
310
311 while (pad_size-- > 0)
312 PRINT(' ');
313
314 if (sign_posn == 0 && (flags & IS_NEGATIVE))
315 PRINT('(');
316
317 if (cs_precedes == 1) {
318 if (sign_posn == 1 || sign_posn == 3) {
319 PRINTS(signstr);
320 if (sep_by_space == 2)
321 PRINT(' ');
322 }
323
324 if (!(flags & SUPRESS_CURR_SYMBOL)) {
325 PRINTS(currency_symbol);
326
327 if (sign_posn == 4) {
328 if (sep_by_space == 2)
329 PRINT(space_char);
330 PRINTS(signstr);
331 if (sep_by_space == 1)
332 PRINT(' ');
333 } else if (sep_by_space == 1)
334 PRINT(space_char);
335 }
336 } else if (sign_posn == 1)
337 PRINTS(signstr);
338
339 PRINTS(asciivalue);
340
341 if (cs_precedes == 0) {
342 if (sign_posn == 3) {
343 if (sep_by_space == 1)
344 PRINT(' ');
345 PRINTS(signstr);
346 }
347
348 if (!(flags & SUPRESS_CURR_SYMBOL)) {
349 if ((sign_posn == 3 && sep_by_space == 2) ||
350 (sep_by_space == 1 && (sign_posn == 0 ||
351 sign_posn == 1 || sign_posn == 2 ||
352 sign_posn == 4)))
353 PRINT(space_char);
354 PRINTS(currency_symbol); /* XXX: len */
355 if (sign_posn == 4) {
356 if (sep_by_space == 2)
357 PRINT(' ');
358 PRINTS(signstr);
359 }
360 }
361 }
362
363 if (sign_posn == 2) {
364 if (sep_by_space == 2)
365 PRINT(' ');
366 PRINTS(signstr);
367 }
368
369 if (sign_posn == 0 && (flags & IS_NEGATIVE))
370 PRINT(')');
371
372 if (dst - tmpptr < width) {
373 if (flags & LEFT_JUSTIFY) {
374 while (dst - tmpptr < width)
375 PRINT(' ');
376 } else {
377 pad_size = dst-tmpptr;
378 (void) memmove(tmpptr + width-pad_size, tmpptr,
379 pad_size);
380 (void) memset(tmpptr, ' ', width-pad_size);
381 dst += width-pad_size;
382 }
383 }
384 }
385
386 PRINT('\0');
387 free(asciivalue);
388 return (dst - s - 1); /* size of put data except trailing '\0' */
389
390 e2big_error:
391 errno = E2BIG;
392 goto end_error;
393
394 format_error:
395 errno = EINVAL;
396
397 end_error:
398 sverrno = errno;
399 free(asciivalue);
400 errno = sverrno;
401 return (-1);
402 }
403
404 ssize_t
405 strfmon(char *_RESTRICT_KYWD s, size_t maxsize,
406 const char *_RESTRICT_KYWD format, ...)
407 {
408 va_list ap;
409 ssize_t ret;
410
411 va_start(ap, format);
412 ret = strfmon_impl(s, maxsize, uselocale(NULL), format, ap);
413 va_end(ap);
414 return (ret);
415 }
416
417 ssize_t
418 strfmon_l(char *_RESTRICT_KYWD s, size_t maxsize, locale_t loc,
419 const char *_RESTRICT_KYWD format, ...)
420 {
421 ssize_t ret;
422 va_list ap;
423 va_start(ap, format);
424 ret = strfmon_impl(s, maxsize, loc, format, ap);
425 va_end(ap);
426 return (ret);
427 }
428
429 static void
430 setup_vars(const struct lc_monetary *lmon, int flags, char *cs_precedes,
431 char *sep_by_space, char *sign_posn, const char **signstr)
432 {
433 if ((flags & IS_NEGATIVE) && (flags & USE_INTL_CURRENCY)) {
434 *cs_precedes = lmon->int_n_cs_precedes[0];
435 *sep_by_space = lmon->int_n_sep_by_space[0];
436 *sign_posn = (flags & PARENTH_POSN) ? 0 :
437 lmon->int_n_sign_posn[0];
438 *signstr = (lmon->negative_sign[0] == '\0') ? "-" :
439 lmon->negative_sign;
440 } else if (flags & USE_INTL_CURRENCY) {
441 *cs_precedes = lmon->int_p_cs_precedes[0];
442 *sep_by_space = lmon->int_p_sep_by_space[0];
443 *sign_posn = (flags & PARENTH_POSN) ? 0 :
444 lmon->int_p_sign_posn[0];
445 *signstr = lmon->positive_sign;
446 } else if (flags & IS_NEGATIVE) {
447 *cs_precedes = lmon->n_cs_precedes[0];
448 *sep_by_space = lmon->n_sep_by_space[0];
449 *sign_posn = (flags & PARENTH_POSN) ? 0 : lmon->n_sign_posn[0];
450 *signstr = (lmon->negative_sign[0] == '\0') ? "-" :
451 lmon->negative_sign;
452 } else {
453 *cs_precedes = lmon->p_cs_precedes[0];
454 *sep_by_space = lmon->p_sep_by_space[0];
455 *sign_posn = (flags & PARENTH_POSN) ? 0 : lmon->p_sign_posn[0];
456 *signstr = lmon->positive_sign;
457 }
458
459 /* Set default values for unspecified information. */
460 if (*cs_precedes != 0)
461 *cs_precedes = 1;
462 if (*sep_by_space == CHAR_MAX)
463 *sep_by_space = 0;
464 if (*sign_posn == CHAR_MAX)
465 *sign_posn = 0;
466 }
467
468 static int
469 calc_left_pad(const struct lc_monetary *lmon, int flags, const char *cur_symb)
470 {
471 char cs_precedes, sep_by_space, sign_posn;
472 const char *signstr;
473 int left_chars = 0;
474
475 setup_vars(lmon, flags, &cs_precedes, &sep_by_space, &sign_posn,
476 &signstr);
477
478 if (cs_precedes != 0) {
479 left_chars += strlen(cur_symb);
480 if (sep_by_space != 0)
481 left_chars++;
482 }
483
484 switch (sign_posn) {
485 case 1:
486 left_chars += strlen(signstr);
487 break;
488 case 3:
489 case 4:
490 if (cs_precedes != 0)
491 left_chars += strlen(signstr);
492 }
493 return (left_chars);
494 }
495
496 static int
497 get_groups(int size, const char *grouping)
498 {
499
500 int chars = 0;
501
502 if (*grouping == CHAR_MAX || *grouping <= 0) /* no grouping ? */
503 return (0);
504
505 while (size > (int)*grouping) {
506 chars++;
507 size -= (int)*grouping++;
508 /* no more grouping ? */
509 if (*grouping == CHAR_MAX)
510 break;
511 /* rest grouping with same value ? */
512 if (*grouping == 0) {
513 chars += (size - 1) / *(grouping - 1);
514 break;
515 }
516 }
517 return (chars);
518 }
519
520 /* convert double to ASCII */
521 static char *
522 format_grouped_double(const struct lc_monetary *lmon,
523 const struct lc_numeric *lnum,
524 double value, int *flags, int left_prec, int right_prec, int pad_char)
525 {
526
527 char *rslt;
528 char *avalue;
529 int avalue_size;
530 char fmt[32];
531
532 size_t bufsize;
533 char *bufend;
534
535 int padded;
536
537 const char *grouping;
538 const char *decimal_point;
539 const char *thousands_sep;
540 int decimal_len;
541 int thousands_len;
542
543 int groups = 0;
544
545 grouping = lmon->mon_grouping;
546 decimal_point = lmon->mon_decimal_point;
547 if (*decimal_point == '\0')
548 decimal_point = lnum->decimal_point;
549 thousands_sep = lmon->mon_thousands_sep;
550 if (*thousands_sep == '\0')
551 thousands_sep = lnum->thousands_sep;
552
553 decimal_len = strlen(decimal_point); /* usually 1 */
554 thousands_len = strlen(thousands_sep); /* 0 or 1 usually */
555
556 /* fill left_prec with default value */
557 if (left_prec == -1)
558 left_prec = 0;
559
560 /* fill right_prec with default value */
561 if (right_prec == -1) {
562 if (*flags & USE_INTL_CURRENCY)
563 right_prec = lmon->int_frac_digits[0];
564 else
565 right_prec = lmon->frac_digits[0];
566
567 if (right_prec == CHAR_MAX) /* POSIX locale ? */
568 right_prec = 2;
569 }
570
571 if (*flags & NEED_GROUPING)
572 left_prec += get_groups(left_prec, grouping);
573
574 /* convert to string */
575 (void) snprintf(fmt, sizeof (fmt), "%%%d.%df",
576 left_prec + right_prec + 1, right_prec);
577 avalue_size = asprintf(&avalue, fmt, value);
578 if (avalue_size < 0)
579 return (NULL);
580
581 /*
582 * Make sure that we've enough space for result string.
583 * This assumes that digits take up at least much space as
584 * grouping and radix characters. The worst case currently known
585 * is for Arabic, where two-byte UTF-8 sequences are used for both
586 * decimal and thousands seperators, and groups can be a small as two
587 * decimal digits. This will do no worse than doubling the storage
588 * requirement.
589 */
590 bufsize = strlen(avalue)*2+1;
591 rslt = calloc(1, bufsize);
592 if (rslt == NULL) {
593 free(avalue);
594 return (NULL);
595 }
596 bufend = rslt + bufsize - 1; /* reserve space for trailing '\0' */
597
598 /* skip spaces at beginning */
599 padded = 0;
600 while (avalue[padded] == ' ') {
601 padded++;
602 avalue_size--;
603 }
604
605 if (right_prec > 0) {
606 bufend -= right_prec;
607 (void) memcpy(bufend, avalue + avalue_size+padded-right_prec,
608 right_prec);
609 bufend -= decimal_len;
610 (void) memcpy(bufend, decimal_point, decimal_len);
611 avalue_size -= (right_prec + decimal_len);
612 }
613
614 if ((*flags & NEED_GROUPING) &&
615 thousands_len != 0 &&
616 *grouping != CHAR_MAX &&
617 *grouping > 0) {
618 while (avalue_size > (int)*grouping) {
619 GRPCPY(*grouping);
620 GRPSEP;
621 grouping++;
622
623 /* no more grouping ? */
624 if (*grouping == CHAR_MAX)
625 break;
626
627 /* rest grouping with same value ? */
628 if (*grouping == 0) {
629 grouping--;
630 while (avalue_size > *grouping) {
631 GRPCPY(*grouping);
632 GRPSEP;
633 }
634 }
635 }
636 if (avalue_size != 0)
637 GRPCPY(avalue_size);
638 padded -= groups;
639
640 } else {
641 bufend -= avalue_size;
642 (void) memcpy(bufend, avalue+padded, avalue_size);
643 if (right_prec == 0)
644 padded--; /* decrease assumed $decimal_point */
645 }
646
647 /* do padding with pad_char */
648 if (padded > 0) {
649 bufend -= padded;
650 (void) memset(bufend, pad_char, padded);
651 }
652
653 bufsize = bufsize - (bufend - rslt) + 1;
654 (void) memmove(rslt, bufend, bufsize);
655 free(avalue);
656 return (rslt);
657 }
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