2 * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/types.h>
43 #define NEED_GROUPING 0x01 /* print digits grouped (default) */
44 #define SIGN_POSN_USED 0x02 /* '+' or '(' usage flag */
45 #define LOCALE_POSN 0x04 /* use locale defined +/- (default) */
46 #define PARENTH_POSN 0x08 /* enclose negative amount in () */
47 #define SUPRESS_CURR_SYMBOL 0x10 /* supress the currency from output */
48 #define LEFT_JUSTIFY 0x20 /* left justify */
49 #define USE_INTL_CURRENCY 0x40 /* use international currency symbol */
50 #define IS_NEGATIVE 0x80 /* is argument value negative ? */
53 #define PRINT(CH) do { \
54 if (dst >= s + maxsize) \
59 #define PRINTS(STR) do { \
61 while (*tmps != '\0') \
65 #define GET_NUMBER(VAR) do { \
67 while (isdigit((unsigned char)*fmt)) { \
68 if (VAR > INT_MAX / 10) \
78 #define GRPCPY(howmany) do { \
82 *--bufend = *(avalue+avalue_size+padded); \
87 *--bufend = thousands_sep; \
91 static void __setup_vars(int, char *, char *, char *, char **);
92 static int __calc_left_pad(int, char *);
93 static char *__format_grouped_double(double, int *, int, int, int);
96 strfmon(char * __restrict s, size_t maxsize, const char * __restrict format,
100 char *dst; /* output destination pointer */
101 const char *fmt; /* current format poistion pointer */
102 struct lconv *lc; /* pointer to lconv structure */
103 char *asciivalue; /* formatted double pointer */
105 int flags; /* formatting options */
106 int pad_char; /* padding character */
107 int pad_size; /* pad size */
108 int width; /* field width */
109 int left_prec; /* left precision */
110 int right_prec; /* right precision */
111 double value; /* just value */
112 char space_char = ' '; /* space after currency */
114 char cs_precedes, /* values gathered from struct lconv */
120 char *tmpptr; /* temporary vars */
123 va_start(ap, format);
129 currency_symbol = NULL;
133 /* pass nonformating characters AS IS */
139 /* "%%" mean just '%' */
140 if (*(fmt+1) == '%') {
147 /* set up initial values */
148 flags = (NEED_GROUPING|LOCALE_POSN);
149 pad_char = ' '; /* padding character is "space" */
150 left_prec = -1; /* no left precision specified */
151 right_prec = -1; /* no right precision specified */
152 width = -1; /* no width specified */
153 value = 0; /* we have no value to print now */
158 case '=': /* fill character */
160 if (pad_char == '\0')
163 case '^': /* not group currency */
164 flags &= ~(NEED_GROUPING);
166 case '+': /* use locale defined signs */
167 if (flags & SIGN_POSN_USED)
169 flags |= (SIGN_POSN_USED|LOCALE_POSN);
171 case '(': /* enclose negatives with () */
172 if (flags & SIGN_POSN_USED)
174 flags |= (SIGN_POSN_USED|PARENTH_POSN);
176 case '!': /* suppress currency symbol */
177 flags |= SUPRESS_CURR_SYMBOL;
179 case '-': /* alignment (left) */
180 flags |= LEFT_JUSTIFY;
189 if (isdigit((unsigned char)*fmt)) {
191 /* Do we have enough space to put number with
194 if ((unsigned int)width >= maxsize - (dst - s))
200 if (!isdigit((unsigned char)*++fmt))
202 GET_NUMBER(left_prec);
203 if ((unsigned int)left_prec >= maxsize - (dst - s))
207 /* Right precision */
209 if (!isdigit((unsigned char)*++fmt))
211 GET_NUMBER(right_prec);
212 if ((unsigned int)right_prec >= maxsize - (dst - s) -
217 /* Conversion Characters */
219 case 'i': /* use internaltion currency format */
220 flags |= USE_INTL_CURRENCY;
222 case 'n': /* use national currency format */
223 flags &= ~(USE_INTL_CURRENCY);
225 default: /* required character is missing or
230 if (currency_symbol != NULL)
231 free(currency_symbol);
232 if (flags & USE_INTL_CURRENCY) {
233 currency_symbol = strdup(lc->int_curr_symbol);
234 if (currency_symbol != NULL)
235 space_char = *(currency_symbol+3);
237 currency_symbol = strdup(lc->currency_symbol);
239 if (currency_symbol == NULL)
240 goto end_error; /* ENOMEM. */
243 value = va_arg(ap, double);
247 flags |= IS_NEGATIVE;
251 /* fill left_prec with amount of padding chars */
252 if (left_prec >= 0) {
253 pad_size = __calc_left_pad((flags ^ IS_NEGATIVE),
255 __calc_left_pad(flags, currency_symbol);
260 if (asciivalue != NULL)
262 asciivalue = __format_grouped_double(value, &flags,
263 left_prec, right_prec, pad_char);
264 if (asciivalue == NULL)
265 goto end_error; /* errno already set */
266 /* to ENOMEM by malloc() */
268 /* set some variables for later use */
269 __setup_vars(flags, &cs_precedes, &sep_by_space,
270 &sign_posn, &signstr);
273 * Description of some LC_MONETARY's values:
275 * p_cs_precedes & n_cs_precedes
277 * = 1 - $currency_symbol precedes the value
278 * for a monetary quantity with a non-negative value
279 * = 0 - symbol succeeds the value
281 * p_sep_by_space & n_sep_by_space
283 * = 0 - no space separates $currency_symbol
284 * from the value for a monetary quantity with a
286 * = 1 - space separates the symbol from the value
287 * = 2 - space separates the symbol and the sign string,
290 * p_sign_posn & n_sign_posn
292 * = 0 - parentheses enclose the quantity and the
294 * = 1 - the sign string precedes the quantity and the
296 * = 2 - the sign string succeeds the quantity and the
298 * = 3 - the sign string precedes the $currency_symbol
299 * = 4 - the sign string succeeds the $currency_symbol
305 while (pad_size-- > 0)
308 if (sign_posn == 0 && (flags & IS_NEGATIVE))
311 if (cs_precedes == 1) {
312 if (sign_posn == 1 || sign_posn == 3) {
314 if (sep_by_space == 2) /* XXX: ? */
318 if (!(flags & SUPRESS_CURR_SYMBOL)) {
319 PRINTS(currency_symbol);
321 if (sign_posn == 4) {
322 if (sep_by_space == 2)
325 if (sep_by_space == 1)
327 } else if (sep_by_space == 1)
330 } else if (sign_posn == 1)
335 if (cs_precedes == 0) {
336 if (sign_posn == 3) {
337 if (sep_by_space == 1)
342 if (!(flags & SUPRESS_CURR_SYMBOL)) {
343 if ((sign_posn == 3 && sep_by_space == 2)
344 || (sep_by_space == 1
350 PRINTS(currency_symbol); /* XXX: len */
351 if (sign_posn == 4) {
352 if (sep_by_space == 2)
359 if (sign_posn == 2) {
360 if (sep_by_space == 2)
365 if (sign_posn == 0 && (flags & IS_NEGATIVE))
368 if (dst - tmpptr < width) {
369 if (flags & LEFT_JUSTIFY) {
370 while (dst - tmpptr < width)
373 pad_size = dst-tmpptr;
374 memmove(tmpptr + width-pad_size, tmpptr,
376 memset(tmpptr, ' ', width-pad_size);
377 dst += width-pad_size;
385 free(currency_symbol);
386 return (dst - s - 1); /* return size of put data except trailing '\0' */
397 if (asciivalue != NULL)
399 if (currency_symbol != NULL)
400 free(currency_symbol);
407 __setup_vars(int flags, char *cs_precedes, char *sep_by_space,
408 char *sign_posn, char **signstr) {
410 struct lconv *lc = localeconv();
412 if ((flags & IS_NEGATIVE) && (flags & USE_INTL_CURRENCY)) {
413 *cs_precedes = lc->int_n_cs_precedes;
414 *sep_by_space = lc->int_n_sep_by_space;
415 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_n_sign_posn;
416 *signstr = (lc->negative_sign == '\0') ? "-"
418 } else if (flags & USE_INTL_CURRENCY) {
419 *cs_precedes = lc->int_p_cs_precedes;
420 *sep_by_space = lc->int_p_sep_by_space;
421 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_p_sign_posn;
422 *signstr = lc->positive_sign;
423 } else if (flags & IS_NEGATIVE) {
424 *cs_precedes = lc->n_cs_precedes;
425 *sep_by_space = lc->n_sep_by_space;
426 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->n_sign_posn;
427 *signstr = (lc->negative_sign == '\0') ? "-"
430 *cs_precedes = lc->p_cs_precedes;
431 *sep_by_space = lc->p_sep_by_space;
432 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->p_sign_posn;
433 *signstr = lc->positive_sign;
436 /* Set defult values for unspecified information. */
437 if (*cs_precedes != 0)
439 if (*sep_by_space == CHAR_MAX)
441 if (*sign_posn == CHAR_MAX)
446 __calc_left_pad(int flags, char *cur_symb) {
448 char cs_precedes, sep_by_space, sign_posn, *signstr;
451 __setup_vars(flags, &cs_precedes, &sep_by_space, &sign_posn, &signstr);
453 if (cs_precedes != 0) {
454 left_chars += strlen(cur_symb);
455 if (sep_by_space != 0)
461 left_chars += strlen(signstr);
465 if (cs_precedes != 0)
466 left_chars += strlen(signstr);
472 get_groups(int size, char *grouping) {
476 if (*grouping == CHAR_MAX || *grouping <= 0) /* no grouping ? */
479 while (size > (int)*grouping) {
481 size -= (int)*grouping++;
482 /* no more grouping ? */
483 if (*grouping == CHAR_MAX)
485 /* rest grouping with same value ? */
486 if (*grouping == 0) {
487 chars += (size - 1) / *(grouping - 1);
494 /* convert double to ASCII */
496 __format_grouped_double(double value, int *flags,
497 int left_prec, int right_prec, int pad_char) {
509 struct lconv *lc = localeconv();
516 grouping = lc->mon_grouping;
517 decimal_point = *lc->mon_decimal_point;
518 if (decimal_point == '\0')
519 decimal_point = *lc->decimal_point;
520 thousands_sep = *lc->mon_thousands_sep;
521 if (thousands_sep == '\0')
522 thousands_sep = *lc->thousands_sep;
524 /* fill left_prec with default value */
528 /* fill right_prec with default value */
529 if (right_prec == -1) {
530 if (*flags & USE_INTL_CURRENCY)
531 right_prec = lc->int_frac_digits;
533 right_prec = lc->frac_digits;
535 if (right_prec == CHAR_MAX) /* POSIX locale ? */
539 if (*flags & NEED_GROUPING)
540 left_prec += get_groups(left_prec, grouping);
542 /* convert to string */
543 snprintf(fmt, sizeof(fmt), "%%%d.%df", left_prec + right_prec + 1,
545 avalue_size = asprintf(&avalue, fmt, value);
549 /* make sure that we've enough space for result string */
550 bufsize = strlen(avalue)*2+1;
551 rslt = calloc(1, bufsize);
556 bufend = rslt + bufsize - 1; /* reserve space for trailing '\0' */
558 /* skip spaces at beggining */
560 while (avalue[padded] == ' ') {
565 if (right_prec > 0) {
566 bufend -= right_prec;
567 memcpy(bufend, avalue + avalue_size+padded-right_prec,
569 *--bufend = decimal_point;
570 avalue_size -= (right_prec + 1);
573 if ((*flags & NEED_GROUPING) &&
574 thousands_sep != '\0' && /* XXX: need investigation */
575 *grouping != CHAR_MAX &&
577 while (avalue_size > (int)*grouping) {
582 /* no more grouping ? */
583 if (*grouping == CHAR_MAX)
586 /* rest grouping with same value ? */
587 if (*grouping == 0) {
589 while (avalue_size > *grouping) {
595 if (avalue_size != 0)
600 bufend -= avalue_size;
601 memcpy(bufend, avalue+padded, avalue_size);
603 padded--; /* decrease assumed $decimal_point */
606 /* do padding with pad_char */
609 memset(bufend, pad_char, padded);
612 bufsize = bufsize - (bufend - rslt) + 1;
613 memmove(rslt, bufend, bufsize);