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include: reduce default stack size
[minix.git] / lib / libc / stdlib / strfmon.c
blob8ce598bcd80fe1cd638b04150ec647559793760e
1 /* $NetBSD: strfmon.c,v 1.7 2009/01/30 23:46:03 lukem Exp $ */
2
3 /*-
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 #include <sys/cdefs.h>
31 #if defined(LIBC_SCCS) && !defined(lint)
32 #if 0
33 __FBSDID("$FreeBSD: src/lib/libc/stdlib/strfmon.c,v 1.14 2003/03/20 08:18:55 ache Exp $");
34 #else
35 __RCSID("$NetBSD: strfmon.c,v 1.7 2009/01/30 23:46:03 lukem Exp $");
36 #endif
37 #endif /* LIBC_SCCS and not lint */
38
39 #if defined(__NetBSD__) || defined(__minix)
40 #include "namespace.h"
41 #include <monetary.h>
42 #endif
43
44 #include <sys/types.h>
45 #include <ctype.h>
46 #include <errno.h>
47 #include <limits.h>
48 #include <locale.h>
49 #include <stdarg.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <stddef.h>
54
55 /* internal flags */
56 #define NEED_GROUPING 0x01 /* print digits grouped (default) */
57 #define SIGN_POSN_USED 0x02 /* '+' or '(' usage flag */
58 #define LOCALE_POSN 0x04 /* use locale defined +/- (default) */
59 #define PARENTH_POSN 0x08 /* enclose negative amount in () */
60 #define SUPRESS_CURR_SYMBOL 0x10 /* supress the currency from output */
61 #define LEFT_JUSTIFY 0x20 /* left justify */
62 #define USE_INTL_CURRENCY 0x40 /* use international currency symbol */
63 #define IS_NEGATIVE 0x80 /* is argument value negative ? */
64
65 /* internal macros */
66 #define PRINT(CH) do { \
67 if (dst >= s + maxsize) \
68 goto e2big_error; \
69 *dst++ = CH; \
70 } while (/* CONSTCOND */ 0)
71
72 #define PRINTS(STR) do { \
73 const char *tmps = STR; \
74 while (*tmps != '\0') \
75 PRINT(*tmps++); \
76 } while (/* CONSTCOND */ 0)
77
78 #define GET_NUMBER(VAR) do { \
79 VAR = 0; \
80 while (isdigit((unsigned char)*fmt)) { \
81 VAR *= 10; \
82 VAR += *fmt - '0'; \
83 if (VAR > 0x00ffffff) \
84 goto e2big_error; \
85 fmt++; \
86 } \
87 } while (/* CONSTCOND */ 0)
88
89 #define GRPCPY(howmany) do { \
90 int i = howmany; \
91 while (i-- > 0) { \
92 avalue_size--; \
93 *--bufend = *(avalue+avalue_size+padded); \
94 } \
95 } while (/* CONSTCOND */ 0)
96
97 #define GRPSEP do { \
98 *--bufend = thousands_sep; \
99 groups++; \
100 } while (/* CONSTCOND */ 0)
101
102 static void __setup_vars(int, char *, char *, char *, const char **);
103 static int __calc_left_pad(int, char *);
104 static char *__format_grouped_double(double, int *, int, int, int);
105
106 ssize_t
107 strfmon(char * __restrict s, size_t maxsize, const char * __restrict format,
108 ...)
109 {
110 va_list ap;
111 char *dst; /* output destination pointer */
112 const char *fmt; /* current format poistion pointer */
113 struct lconv *lc; /* pointer to lconv structure */
114 char *asciivalue; /* formatted double pointer */
115
116 int flags; /* formatting options */
117 int pad_char; /* padding character */
118 int pad_size; /* pad size */
119 int width; /* field width */
120 int left_prec; /* left precision */
121 int right_prec; /* right precision */
122 double value; /* just value */
123 char space_char = ' '; /* space after currency */
124
125 char cs_precedes, /* values gathered from struct lconv */
126 sep_by_space,
127 sign_posn,
128 *currency_symbol;
129 const char *signstr;
130
131 char *tmpptr; /* temporary vars */
132 int sverrno;
133
134 va_start(ap, format);
135
136 lc = localeconv();
137 dst = s;
138 fmt = format;
139 asciivalue = NULL;
140 currency_symbol = NULL;
141 pad_size = 0;
142
143 while (*fmt) {
144 /* pass nonformating characters AS IS */
145 if (*fmt != '%')
146 goto literal;
147
148 /* '%' found ! */
149
150 /* "%%" mean just '%' */
151 if (*(fmt+1) == '%') {
152 fmt++;
153 literal:
154 PRINT(*fmt++);
155 continue;
156 }
157
158 /* set up initial values */
159 flags = (NEED_GROUPING|LOCALE_POSN);
160 pad_char = ' '; /* padding character is "space" */
161 left_prec = -1; /* no left precision specified */
162 right_prec = -1; /* no right precision specified */
163 width = -1; /* no width specified */
164 value = 0; /* we have no value to print now */
165
166 /* Flags */
167 while (/* CONSTCOND */ 1) {
168 switch (*++fmt) {
169 case '=': /* fill character */
170 pad_char = *++fmt;
171 if (pad_char == '\0')
172 goto format_error;
173 continue;
174 case '^': /* not group currency */
175 flags &= ~(NEED_GROUPING);
176 continue;
177 case '+': /* use locale defined signs */
178 if (flags & SIGN_POSN_USED)
179 goto format_error;
180 flags |= (SIGN_POSN_USED|LOCALE_POSN);
181 continue;
182 case '(': /* enclose negatives with () */
183 if (flags & SIGN_POSN_USED)
184 goto format_error;
185 flags |= (SIGN_POSN_USED|PARENTH_POSN);
186 continue;
187 case '!': /* suppress currency symbol */
188 flags |= SUPRESS_CURR_SYMBOL;
189 continue;
190 case '-': /* alignment (left) */
191 flags |= LEFT_JUSTIFY;
192 continue;
193 default:
194 break;
195 }
196 break;
197 }
198
199 /* field Width */
200 if (isdigit((unsigned char)*fmt)) {
201 ptrdiff_t d = dst - s;
202 GET_NUMBER(width);
203 /* Do we have enough space to put number with
204 * required width ?
205 */
206
207 if ((size_t)(d + width) >= maxsize)
208 goto e2big_error;
209 }
210
211 /* Left precision */
212 if (*fmt == '#') {
213 if (!isdigit((unsigned char)*++fmt))
214 goto format_error;
215 GET_NUMBER(left_prec);
216 }
217
218 /* Right precision */
219 if (*fmt == '.') {
220 if (!isdigit((unsigned char)*++fmt))
221 goto format_error;
222 GET_NUMBER(right_prec);
223 }
224
225 /* Conversion Characters */
226 switch (*fmt++) {
227 case 'i': /* use internaltion currency format */
228 flags |= USE_INTL_CURRENCY;
229 break;
230 case 'n': /* use national currency format */
231 flags &= ~(USE_INTL_CURRENCY);
232 break;
233 default: /* required character is missing or
234 premature EOS */
235 goto format_error;
236 }
237
238 if (currency_symbol)
239 free(currency_symbol);
240 if (flags & USE_INTL_CURRENCY) {
241 currency_symbol = strdup(lc->int_curr_symbol);
242 if (currency_symbol != NULL)
243 space_char = *(currency_symbol+3);
244 } else
245 currency_symbol = strdup(lc->currency_symbol);
246
247 if (currency_symbol == NULL)
248 goto end_error; /* ENOMEM. */
249
250 /* value itself */
251 value = va_arg(ap, double);
252
253 /* detect sign */
254 if (value < 0) {
255 flags |= IS_NEGATIVE;
256 value = -value;
257 }
258
259 /* fill left_prec with amount of padding chars */
260 if (left_prec >= 0) {
261 pad_size = __calc_left_pad((flags ^ IS_NEGATIVE),
262 currency_symbol) -
263 __calc_left_pad(flags, currency_symbol);
264 if (pad_size < 0)
265 pad_size = 0;
266 }
267
268 asciivalue = __format_grouped_double(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(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) /* XXX: ? */
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
351 && (sign_posn == 0
352 || sign_posn == 1
353 || sign_posn == 2
354 || sign_posn == 4)))
355 PRINT(space_char);
356 PRINTS(currency_symbol); /* XXX: len */
357 if (sign_posn == 4) {
358 if (sep_by_space == 2)
359 PRINT(' ');
360 PRINTS(signstr);
361 }
362 }
363 }
364
365 if (sign_posn == 2) {
366 if (sep_by_space == 2)
367 PRINT(' ');
368 PRINTS(signstr);
369 }
370
371 if (sign_posn == 0 && (flags & IS_NEGATIVE))
372 PRINT(')');
373
374 if (dst - tmpptr < width) {
375 if (flags & LEFT_JUSTIFY) {
376 while (dst - tmpptr < width)
377 PRINT(' ');
378 } else {
379 pad_size = dst-tmpptr;
380 memmove(tmpptr + width-pad_size, tmpptr,
381 (size_t) pad_size);
382 memset(tmpptr, ' ', (size_t) width-pad_size);
383 dst += width-pad_size;
384 }
385 }
386 }
387
388 PRINT('\0');
389 va_end(ap);
390 free(asciivalue);
391 free(currency_symbol);
392 return (dst - s - 1); /* return size of put data except trailing '\0' */
393
394 e2big_error:
395 errno = E2BIG;
396 goto end_error;
397
398 format_error:
399 errno = EINVAL;
400
401 end_error:
402 sverrno = errno;
403 if (asciivalue != NULL)
404 free(asciivalue);
405 if (currency_symbol != NULL)
406 free(currency_symbol);
407 errno = sverrno;
408 va_end(ap);
409 return (-1);
410 }
411
412 static void
413 __setup_vars(int flags, char *cs_precedes, char *sep_by_space,
414 char *sign_posn, const char **signstr) {
415 struct lconv *lc = localeconv();
416
417 if ((flags & IS_NEGATIVE) && (flags & USE_INTL_CURRENCY)) {
418 *cs_precedes = lc->int_n_cs_precedes;
419 *sep_by_space = lc->int_n_sep_by_space;
420 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_n_sign_posn;
421 *signstr = (lc->negative_sign == '\0') ? "-"
422 : lc->negative_sign;
423 } else if (flags & USE_INTL_CURRENCY) {
424 *cs_precedes = lc->int_p_cs_precedes;
425 *sep_by_space = lc->int_p_sep_by_space;
426 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_p_sign_posn;
427 *signstr = lc->positive_sign;
428 } else if (flags & IS_NEGATIVE) {
429 *cs_precedes = lc->n_cs_precedes;
430 *sep_by_space = lc->n_sep_by_space;
431 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->n_sign_posn;
432 *signstr = (lc->negative_sign == '\0') ? "-"
433 : lc->negative_sign;
434 } else {
435 *cs_precedes = lc->p_cs_precedes;
436 *sep_by_space = lc->p_sep_by_space;
437 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->p_sign_posn;
438 *signstr = lc->positive_sign;
439 }
440
441 /* Set defult values for unspecified information. */
442 if (*cs_precedes != 0)
443 *cs_precedes = 1;
444 if (*sep_by_space == CHAR_MAX)
445 *sep_by_space = 0;
446 if (*sign_posn == CHAR_MAX)
447 *sign_posn = 0;
448 }
449
450 static int
451 __calc_left_pad(int flags, char *cur_symb) {
452
453 char cs_precedes, sep_by_space, sign_posn;
454 const char *signstr;
455 int left_chars = 0;
456
457 __setup_vars(flags, &cs_precedes, &sep_by_space, &sign_posn, &signstr);
458
459 if (cs_precedes != 0) {
460 left_chars += strlen(cur_symb);
461 if (sep_by_space != 0)
462 left_chars++;
463 }
464
465 switch (sign_posn) {
466 case 1:
467 left_chars += strlen(signstr);
468 break;
469 case 3:
470 case 4:
471 if (cs_precedes != 0)
472 left_chars += strlen(signstr);
473 }
474 return (left_chars);
475 }
476
477 static int
478 get_groups(int size, char *grouping) {
479
480 int chars = 0;
481
482 if (*grouping == CHAR_MAX || *grouping <= 0) /* no grouping ? */
483 return (0);
484
485 while (size > (int)*grouping) {
486 chars++;
487 size -= (int)*grouping++;
488 /* no more grouping ? */
489 if (*grouping == CHAR_MAX)
490 break;
491 /* rest grouping with same value ? */
492 if (*grouping == 0) {
493 chars += (size - 1) / *(grouping - 1);
494 break;
495 }
496 }
497 return (chars);
498 }
499
500 /* convert double to ASCII */
501 static char *
502 __format_grouped_double(double value, int *flags,
503 int left_prec, int right_prec, int pad_char) {
504
505 char *rslt;
506 char *avalue;
507 int avalue_size;
508 char fmt[32];
509
510 size_t bufsize;
511 char *bufend;
512
513 int padded;
514
515 struct lconv *lc = localeconv();
516 char *grouping;
517 char decimal_point;
518 char thousands_sep;
519
520 int groups = 0;
521
522 grouping = lc->mon_grouping;
523 decimal_point = *lc->mon_decimal_point;
524 if (decimal_point == '\0')
525 decimal_point = *lc->decimal_point;
526 thousands_sep = *lc->mon_thousands_sep;
527 if (thousands_sep == '\0')
528 thousands_sep = *lc->thousands_sep;
529
530 /* fill left_prec with default value */
531 if (left_prec == -1)
532 left_prec = 0;
533
534 /* fill right_prec with default value */
535 if (right_prec == -1) {
536 if (*flags & USE_INTL_CURRENCY)
537 right_prec = lc->int_frac_digits;
538 else
539 right_prec = lc->frac_digits;
540
541 if (right_prec == CHAR_MAX) /* POSIX locale ? */
542 right_prec = 2;
543 }
544
545 if (*flags & NEED_GROUPING)
546 left_prec += get_groups(left_prec, grouping);
547
548 /* convert to string */
549 snprintf(fmt, sizeof(fmt), "%%%d.%df", left_prec + right_prec + 1,
550 right_prec);
551 avalue_size = asprintf(&avalue, fmt, value);
552 if (avalue_size < 0)
553 return (NULL);
554
555 /* make sure that we've enough space for result string */
556 bufsize = strlen(avalue)*2+1;
557 rslt = malloc(bufsize);
558 if (rslt == NULL) {
559 free(avalue);
560 return (NULL);
561 }
562 memset(rslt, 0, bufsize);
563 bufend = rslt + bufsize - 1; /* reserve space for trailing '\0' */
564
565 /* skip spaces at beggining */
566 padded = 0;
567 while (avalue[padded] == ' ') {
568 padded++;
569 avalue_size--;
570 }
571
572 if (right_prec > 0) {
573 bufend -= right_prec;
574 memcpy(bufend, avalue + avalue_size+padded-right_prec,
575 (size_t) right_prec);
576 *--bufend = decimal_point;
577 avalue_size -= (right_prec + 1);
578 }
579
580 if ((*flags & NEED_GROUPING) &&
581 thousands_sep != '\0' && /* XXX: need investigation */
582 *grouping != CHAR_MAX &&
583 *grouping > 0) {
584 while (avalue_size > (int)*grouping) {
585 GRPCPY(*grouping);
586 GRPSEP;
587 grouping++;
588
589 /* no more grouping ? */
590 if (*grouping == CHAR_MAX)
591 break;
592
593 /* rest grouping with same value ? */
594 if (*grouping == 0) {
595 grouping--;
596 while (avalue_size > *grouping) {
597 GRPCPY(*grouping);
598 GRPSEP;
599 }
600 }
601 }
602 if (avalue_size != 0)
603 GRPCPY(avalue_size);
604 padded -= groups;
605
606 } else {
607 bufend -= avalue_size;
608 memcpy(bufend, avalue+padded, (size_t) avalue_size);
609 if (right_prec == 0)
610 padded--; /* decrease assumed $decimal_point */
611 }
612
613 /* do padding with pad_char */
614 if (padded > 0) {
615 bufend -= padded;
616 memset(bufend, pad_char, (size_t) padded);
617 }
618
619 bufsize = bufsize - (bufend - rslt) + 1;
620 memmove(rslt, bufend, bufsize);
621 free(avalue);
622 return (rslt);
623 }
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