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)) { \
74 #define GRPCPY(howmany) do { \
78 *--bufend = *(avalue+avalue_size+padded); \
83 *--bufend = thousands_sep; \
87 static void __setup_vars(int, char *, char *, char *, char **);
88 static int __calc_left_pad(int, char *);
89 static char *__format_grouped_double(double, int *, int, int, int);
92 strfmon(char * __restrict s, size_t maxsize, const char * __restrict format,
96 char *dst; /* output destination pointer */
97 const char *fmt; /* current format poistion pointer */
98 struct lconv *lc; /* pointer to lconv structure */
99 char *asciivalue; /* formatted double pointer */
101 int flags; /* formatting options */
102 int pad_char; /* padding character */
103 int pad_size; /* pad size */
104 int width; /* field width */
105 int left_prec; /* left precision */
106 int right_prec; /* right precision */
107 double value; /* just value */
108 char space_char = ' '; /* space after currency */
110 char cs_precedes, /* values gathered from struct lconv */
116 char *tmpptr; /* temporary vars */
119 va_start(ap, format);
125 currency_symbol = NULL;
129 /* pass nonformating characters AS IS */
135 /* "%%" mean just '%' */
136 if (*(fmt+1) == '%') {
143 /* set up initial values */
144 flags = (NEED_GROUPING|LOCALE_POSN);
145 pad_char = ' '; /* padding character is "space" */
146 left_prec = -1; /* no left precision specified */
147 right_prec = -1; /* no right precision specified */
148 width = -1; /* no width specified */
149 value = 0; /* we have no value to print now */
154 case '=': /* fill character */
156 if (pad_char == '\0')
159 case '^': /* not group currency */
160 flags &= ~(NEED_GROUPING);
162 case '+': /* use locale defined signs */
163 if (flags & SIGN_POSN_USED)
165 flags |= (SIGN_POSN_USED|LOCALE_POSN);
167 case '(': /* enclose negatives with () */
168 if (flags & SIGN_POSN_USED)
170 flags |= (SIGN_POSN_USED|PARENTH_POSN);
172 case '!': /* suppress currency symbol */
173 flags |= SUPRESS_CURR_SYMBOL;
175 case '-': /* alignment (left) */
176 flags |= LEFT_JUSTIFY;
185 if (isdigit((unsigned char)*fmt)) {
187 /* Do we have enough space to put number with
190 if (dst + width >= s + maxsize)
196 if (!isdigit((unsigned char)*++fmt))
198 GET_NUMBER(left_prec);
201 /* Right precision */
203 if (!isdigit((unsigned char)*++fmt))
205 GET_NUMBER(right_prec);
208 /* Conversion Characters */
210 case 'i': /* use internaltion currency format */
211 flags |= USE_INTL_CURRENCY;
213 case 'n': /* use national currency format */
214 flags &= ~(USE_INTL_CURRENCY);
216 default: /* required character is missing or
221 if (flags & USE_INTL_CURRENCY) {
222 currency_symbol = strdup(lc->int_curr_symbol);
223 if (currency_symbol != NULL)
224 space_char = *(currency_symbol+3);
226 currency_symbol = strdup(lc->currency_symbol);
228 if (currency_symbol == NULL)
229 goto end_error; /* ENOMEM. */
232 value = va_arg(ap, double);
236 flags |= IS_NEGATIVE;
240 /* fill left_prec with amount of padding chars */
241 if (left_prec >= 0) {
242 pad_size = __calc_left_pad((flags ^ IS_NEGATIVE),
244 __calc_left_pad(flags, currency_symbol);
249 asciivalue = __format_grouped_double(value, &flags,
250 left_prec, right_prec, pad_char);
251 if (asciivalue == NULL)
252 goto end_error; /* errno already set */
253 /* to ENOMEM by malloc() */
255 /* set some variables for later use */
256 __setup_vars(flags, &cs_precedes, &sep_by_space,
257 &sign_posn, &signstr);
260 * Description of some LC_MONETARY's values:
262 * p_cs_precedes & n_cs_precedes
264 * = 1 - $currency_symbol precedes the value
265 * for a monetary quantity with a non-negative value
266 * = 0 - symbol succeeds the value
268 * p_sep_by_space & n_sep_by_space
270 * = 0 - no space separates $currency_symbol
271 * from the value for a monetary quantity with a
273 * = 1 - space separates the symbol from the value
274 * = 2 - space separates the symbol and the sign string,
277 * p_sign_posn & n_sign_posn
279 * = 0 - parentheses enclose the quantity and the
281 * = 1 - the sign string precedes the quantity and the
283 * = 2 - the sign string succeeds the quantity and the
285 * = 3 - the sign string precedes the $currency_symbol
286 * = 4 - the sign string succeeds the $currency_symbol
292 while (pad_size-- > 0)
295 if (sign_posn == 0 && (flags & IS_NEGATIVE))
298 if (cs_precedes == 1) {
299 if (sign_posn == 1 || sign_posn == 3) {
301 if (sep_by_space == 2) /* XXX: ? */
305 if (!(flags & SUPRESS_CURR_SYMBOL)) {
306 PRINTS(currency_symbol);
308 if (sign_posn == 4) {
309 if (sep_by_space == 2)
312 if (sep_by_space == 1)
314 } else if (sep_by_space == 1)
317 } else if (sign_posn == 1)
322 if (cs_precedes == 0) {
323 if (sign_posn == 3) {
324 if (sep_by_space == 1)
329 if (!(flags & SUPRESS_CURR_SYMBOL)) {
330 if ((sign_posn == 3 && sep_by_space == 2)
331 || (sep_by_space == 1
337 PRINTS(currency_symbol); /* XXX: len */
338 if (sign_posn == 4) {
339 if (sep_by_space == 2)
346 if (sign_posn == 2) {
347 if (sep_by_space == 2)
352 if (sign_posn == 0 && (flags & IS_NEGATIVE))
355 if (dst - tmpptr < width) {
356 if (flags & LEFT_JUSTIFY) {
357 while (dst - tmpptr < width)
360 pad_size = dst-tmpptr;
361 memmove(tmpptr + width-pad_size, tmpptr,
363 memset(tmpptr, ' ', width-pad_size);
364 dst += width-pad_size;
372 free(currency_symbol);
373 return (dst - s - 1); /* return size of put data except trailing '\0' */
384 if (asciivalue != NULL)
386 if (currency_symbol != NULL)
387 free(currency_symbol);
394 __setup_vars(int flags, char *cs_precedes, char *sep_by_space,
395 char *sign_posn, char **signstr) {
397 struct lconv *lc = localeconv();
399 if ((flags & IS_NEGATIVE) && (flags & USE_INTL_CURRENCY)) {
400 *cs_precedes = lc->int_n_cs_precedes;
401 *sep_by_space = lc->int_n_sep_by_space;
402 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_n_sign_posn;
403 *signstr = (lc->negative_sign == '\0') ? "-"
405 } else if (flags & USE_INTL_CURRENCY) {
406 *cs_precedes = lc->int_p_cs_precedes;
407 *sep_by_space = lc->int_p_sep_by_space;
408 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_p_sign_posn;
409 *signstr = lc->positive_sign;
410 } else if (flags & IS_NEGATIVE) {
411 *cs_precedes = lc->n_cs_precedes;
412 *sep_by_space = lc->n_sep_by_space;
413 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->n_sign_posn;
414 *signstr = (lc->negative_sign == '\0') ? "-"
417 *cs_precedes = lc->p_cs_precedes;
418 *sep_by_space = lc->p_sep_by_space;
419 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->p_sign_posn;
420 *signstr = lc->positive_sign;
423 /* Set defult values for unspecified information. */
424 if (*cs_precedes != 0)
426 if (*sep_by_space == CHAR_MAX)
428 if (*sign_posn == CHAR_MAX)
433 __calc_left_pad(int flags, char *cur_symb) {
435 char cs_precedes, sep_by_space, sign_posn, *signstr;
438 __setup_vars(flags, &cs_precedes, &sep_by_space, &sign_posn, &signstr);
440 if (cs_precedes != 0) {
441 left_chars += strlen(cur_symb);
442 if (sep_by_space != 0)
448 left_chars += strlen(signstr);
452 if (cs_precedes != 0)
453 left_chars += strlen(signstr);
459 get_groups(int size, char *grouping) {
463 if (*grouping == CHAR_MAX || *grouping <= 0) /* no grouping ? */
466 while (size > (int)*grouping) {
468 size -= (int)*grouping++;
469 /* no more grouping ? */
470 if (*grouping == CHAR_MAX)
472 /* rest grouping with same value ? */
473 if (*grouping == 0) {
474 chars += (size - 1) / *(grouping - 1);
481 /* convert double to ASCII */
483 __format_grouped_double(double value, int *flags,
484 int left_prec, int right_prec, int pad_char) {
496 struct lconv *lc = localeconv();
503 grouping = lc->mon_grouping;
504 decimal_point = *lc->mon_decimal_point;
505 if (decimal_point == '\0')
506 decimal_point = *lc->decimal_point;
507 thousands_sep = *lc->mon_thousands_sep;
508 if (thousands_sep == '\0')
509 thousands_sep = *lc->thousands_sep;
511 /* fill left_prec with default value */
515 /* fill right_prec with default value */
516 if (right_prec == -1) {
517 if (*flags & USE_INTL_CURRENCY)
518 right_prec = lc->int_frac_digits;
520 right_prec = lc->frac_digits;
522 if (right_prec == CHAR_MAX) /* POSIX locale ? */
526 if (*flags & NEED_GROUPING)
527 left_prec += get_groups(left_prec, grouping);
529 /* convert to string */
530 snprintf(fmt, sizeof(fmt), "%%%d.%df", left_prec + right_prec + 1,
532 avalue_size = asprintf(&avalue, fmt, value);
536 /* make sure that we've enough space for result string */
537 bufsize = strlen(avalue)*2+1;
538 rslt = malloc(bufsize);
543 memset(rslt, 0, bufsize);
544 bufend = rslt + bufsize - 1; /* reserve space for trailing '\0' */
546 /* skip spaces at beggining */
548 while (avalue[padded] == ' ') {
553 if (right_prec > 0) {
554 bufend -= right_prec;
555 memcpy(bufend, avalue + avalue_size+padded-right_prec,
557 *--bufend = decimal_point;
558 avalue_size -= (right_prec + 1);
561 if ((*flags & NEED_GROUPING) &&
562 thousands_sep != '\0' && /* XXX: need investigation */
563 *grouping != CHAR_MAX &&
565 while (avalue_size > (int)*grouping) {
570 /* no more grouping ? */
571 if (*grouping == CHAR_MAX)
574 /* rest grouping with same value ? */
575 if (*grouping == 0) {
577 while (avalue_size > *grouping) {
583 if (avalue_size != 0)
588 bufend -= avalue_size;
589 memcpy(bufend, avalue+padded, avalue_size);
591 padded--; /* decrease assumed $decimal_point */
594 /* do padding with pad_char */
597 memset(bufend, pad_char, padded);
600 bufsize = bufsize - (bufend - rslt) + 1;
601 memmove(rslt, bufend, bufsize);