[apple/libc.git] / stdlib / NetBSD / strfmon.c

/*	$NetBSD: strfmon.c,v 1.6 2008/03/27 21:50:30 christos Exp $	*/

/*-
 * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
__FBSDID("$FreeBSD: src/lib/libc/stdlib/strfmon.c,v 1.14 2003/03/20 08:18:55 ache Exp $");
#else
__RCSID("$NetBSD: strfmon.c,v 1.6 2008/03/27 21:50:30 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

#if defined(__NetBSD__)
#include "namespace.h"
#include <monetary.h>
#endif

#include <sys/types.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <locale.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stddef.h>

/* internal flags */
#define	NEED_GROUPING		0x01	/* print digits grouped (default) */
#define	SIGN_POSN_USED		0x02	/* '+' or '(' usage flag */
#define	LOCALE_POSN		0x04	/* use locale defined +/- (default) */
#define	PARENTH_POSN		0x08	/* enclose negative amount in () */
#define	SUPRESS_CURR_SYMBOL	0x10	/* supress the currency from output */
#define	LEFT_JUSTIFY		0x20	/* left justify */
#define	USE_INTL_CURRENCY	0x40	/* use international currency symbol */
#define IS_NEGATIVE		0x80	/* is argument value negative ? */

/* internal macros */
#define PRINT(CH) do {						\
	if (dst >= s + maxsize) 				\
		goto e2big_error;				\
	*dst++ = CH;						\
} while (/* CONSTCOND */ 0)

#define PRINTS(STR) do {					\
	const char *tmps = STR;					\
	while (*tmps != '\0')					\
		PRINT(*tmps++);					\
} while (/* CONSTCOND */ 0)

#define GET_NUMBER(VAR)	do {					\
	VAR = 0;						\
	while (isdigit((unsigned char)*fmt)) {			\
		VAR *= 10;					\
		VAR += *fmt - '0';				\
		if (VAR > 0x00ffffff)				\
			goto e2big_error;			\
		fmt++;						\
	}							\
} while (/* CONSTCOND */ 0)

#define GRPCPY(howmany) do {					\
	int i = howmany;					\
	while (i-- > 0) {					\
		avalue_size--;					\
		*--bufend = *(avalue+avalue_size+padded);	\
	}							\
} while (/* CONSTCOND */ 0)

#define GRPSEP do {						\
	*--bufend = thousands_sep;				\
	groups++;						\
} while (/* CONSTCOND */ 0)

static void __setup_vars(int, char *, char *, char *, const char **);
static int __calc_left_pad(int, char *);
static char *__format_grouped_double(double, int *, int, int, int);

ssize_t
strfmon(char * __restrict s, size_t maxsize, const char * __restrict format,
    ...)
{
	va_list		ap;
	char 		*dst;		/* output destination pointer */
	const char 	*fmt;		/* current format poistion pointer */
	struct lconv 	*lc;		/* pointer to lconv structure */
	char		*asciivalue;	/* formatted double pointer */

	int		flags;		/* formatting options */
	int		pad_char;	/* padding character */
	int		pad_size;	/* pad size */
	int		width;		/* field width */
	int		left_prec;	/* left precision */
	int		right_prec;	/* right precision */
	double		value;		/* just value */
	char		space_char = ' '; /* space after currency */

	char		cs_precedes,	/* values gathered from struct lconv */
			sep_by_space,
			sign_posn,
			*currency_symbol;
	const char	*signstr;

	char		*tmpptr;	/* temporary vars */
	int		sverrno;

        va_start(ap, format);

	lc = localeconv();
	dst = s;
	fmt = format;
	asciivalue = NULL;
	currency_symbol = NULL;
	pad_size = 0;

	while (*fmt) {
		/* pass nonformating characters AS IS */
		if (*fmt != '%')
			goto literal;

		/* '%' found ! */

		/* "%%" mean just '%' */
		if (*(fmt+1) == '%') {
			fmt++;
	literal:
			PRINT(*fmt++);
			continue;
		}

		/* set up initial values */
		flags = (NEED_GROUPING|LOCALE_POSN);
		pad_char = ' ';		/* padding character is "space" */
		left_prec = -1;		/* no left precision specified */
		right_prec = -1;	/* no right precision specified */
		width = -1;		/* no width specified */
		value = 0;		/* we have no value to print now */

		/* Flags */
		while (/* CONSTCOND */ 1) {
			switch (*++fmt) {
				case '=':	/* fill character */
					pad_char = *++fmt;
					if (pad_char == '\0')
						goto format_error;
					continue;
				case '^':	/* not group currency  */
					flags &= ~(NEED_GROUPING);
					continue;
				case '+':	/* use locale defined signs */
					if (flags & SIGN_POSN_USED)
						goto format_error;
					flags |= (SIGN_POSN_USED|LOCALE_POSN);
					continue;
				case '(':	/* enclose negatives with () */
					if (flags & SIGN_POSN_USED)
						goto format_error;
					flags |= (SIGN_POSN_USED|PARENTH_POSN);
					continue;
				case '!':	/* suppress currency symbol */
					flags |= SUPRESS_CURR_SYMBOL;
					continue;
				case '-':	/* alignment (left)  */
					flags |= LEFT_JUSTIFY;
					continue;
				default:
					break;
			}
			break;
		}

		/* field Width */
		if (isdigit((unsigned char)*fmt)) {
			ptrdiff_t d = dst - s;
			GET_NUMBER(width);
			/* Do we have enough space to put number with
			 * required width ?
			 */

			if (d + width >= maxsize)
				goto e2big_error;
		}

		/* Left precision */
		if (*fmt == '#') {
			if (!isdigit((unsigned char)*++fmt))
				goto format_error;
			GET_NUMBER(left_prec);
		}

		/* Right precision */
		if (*fmt == '.') {
			if (!isdigit((unsigned char)*++fmt))
				goto format_error;
			GET_NUMBER(right_prec);
		}

		/* Conversion Characters */
		switch (*fmt++) {
			case 'i':	/* use internaltion currency format */
				flags |= USE_INTL_CURRENCY;
				break;
			case 'n':	/* use national currency format */
				flags &= ~(USE_INTL_CURRENCY);
				break;
			default:	/* required character is missing or
					   premature EOS */
				goto format_error;
		}

		if (currency_symbol)
			free(currency_symbol);
		if (flags & USE_INTL_CURRENCY) {
			currency_symbol = strdup(lc->int_curr_symbol);
			if (currency_symbol != NULL)
				space_char = *(currency_symbol+3);
		} else
			currency_symbol = strdup(lc->currency_symbol);

		if (currency_symbol == NULL)
			goto end_error;			/* ENOMEM. */

		/* value itself */
		value = va_arg(ap, double);

		/* detect sign */
		if (value < 0) {
			flags |= IS_NEGATIVE;
			value = -value;
		}

		/* fill left_prec with amount of padding chars */
		if (left_prec >= 0) {
			pad_size = __calc_left_pad((flags ^ IS_NEGATIVE),
							currency_symbol) -
				   __calc_left_pad(flags, currency_symbol);
			if (pad_size < 0)
				pad_size = 0;
		}

		asciivalue = __format_grouped_double(value, &flags,
				left_prec, right_prec, pad_char);
		if (asciivalue == NULL)
			goto end_error;		/* errno already set     */
						/* to ENOMEM by malloc() */

		/* set some variables for later use */
		__setup_vars(flags, &cs_precedes, &sep_by_space,
				&sign_posn, &signstr);

		/*
		 * Description of some LC_MONETARY's values:
		 *
		 * p_cs_precedes & n_cs_precedes
		 *
		 * = 1 - $currency_symbol precedes the value
		 *       for a monetary quantity with a non-negative value
		 * = 0 - symbol succeeds the value
		 *
		 * p_sep_by_space & n_sep_by_space
                 *
		 * = 0 - no space separates $currency_symbol
		 *       from the value for a monetary quantity with a
		 *	 non-negative value
		 * = 1 - space separates the symbol from the value
		 * = 2 - space separates the symbol and the sign string,
		 *       if adjacent.
                 *
		 * p_sign_posn & n_sign_posn
                 *
		 * = 0 - parentheses enclose the quantity and the
		 *	 $currency_symbol
		 * = 1 - the sign string precedes the quantity and the 
		 *       $currency_symbol
		 * = 2 - the sign string succeeds the quantity and the 
		 *       $currency_symbol
		 * = 3 - the sign string precedes the $currency_symbol
		 * = 4 - the sign string succeeds the $currency_symbol
                 *
		 */

		tmpptr = dst;

		while (pad_size-- > 0)
			PRINT(' ');

		if (sign_posn == 0 && (flags & IS_NEGATIVE))
			PRINT('(');

		if (cs_precedes == 1) {
			if (sign_posn == 1 || sign_posn == 3) {
				PRINTS(signstr);
				if (sep_by_space == 2)		/* XXX: ? */
					PRINT(' ');
			}

			if (!(flags & SUPRESS_CURR_SYMBOL)) {
				PRINTS(currency_symbol);

				if (sign_posn == 4) {
					if (sep_by_space == 2)
						PRINT(space_char);
					PRINTS(signstr);
					if (sep_by_space == 1)
						PRINT(' ');
				} else if (sep_by_space == 1)
					PRINT(space_char);
			}
		} else if (sign_posn == 1)
			PRINTS(signstr);

		PRINTS(asciivalue);

		if (cs_precedes == 0) {
			if (sign_posn == 3) {
				if (sep_by_space == 1)
					PRINT(' ');
				PRINTS(signstr);
			}

			if (!(flags & SUPRESS_CURR_SYMBOL)) {
				if ((sign_posn == 3 && sep_by_space == 2)
				    || (sep_by_space == 1
				    && (sign_posn == 0
				    || sign_posn == 1
				    || sign_posn == 2
				    || sign_posn == 4)))
					PRINT(space_char);
				PRINTS(currency_symbol); /* XXX: len */
				if (sign_posn == 4) {
					if (sep_by_space == 2)
						PRINT(' ');
					PRINTS(signstr);
				}
			}
		}

		if (sign_posn == 2) {
			if (sep_by_space == 2)
				PRINT(' ');
			PRINTS(signstr);
		}

		if (sign_posn == 0 && (flags & IS_NEGATIVE))
			PRINT(')');

		if (dst - tmpptr < width) {
			if (flags & LEFT_JUSTIFY) {
				while (dst - tmpptr < width)
					PRINT(' ');
			} else {
				pad_size = dst-tmpptr;
				memmove(tmpptr + width-pad_size, tmpptr,
				    (size_t) pad_size);
				memset(tmpptr, ' ', (size_t) width-pad_size);
				dst += width-pad_size;
			}
		}
	}

	PRINT('\0');
	va_end(ap);
	free(asciivalue);
	free(currency_symbol);
	return (dst - s - 1);	/* return size of put data except trailing '\0' */

e2big_error:
	errno = E2BIG;
	goto end_error;

format_error:
	errno = EINVAL;

end_error:
	sverrno = errno;
	if (asciivalue != NULL)
		free(asciivalue);
	if (currency_symbol != NULL)
		free(currency_symbol);
	errno = sverrno;
	va_end(ap);
	return (-1);
}

static void
__setup_vars(int flags, char *cs_precedes, char *sep_by_space,
		char *sign_posn, const char **signstr) {
	struct lconv *lc = localeconv();

	if ((flags & IS_NEGATIVE) && (flags & USE_INTL_CURRENCY)) {
		*cs_precedes = lc->int_n_cs_precedes;
		*sep_by_space = lc->int_n_sep_by_space;
		*sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_n_sign_posn;
		*signstr = (lc->negative_sign == '\0') ? "-"
		    : lc->negative_sign;
	} else if (flags & USE_INTL_CURRENCY) {
		*cs_precedes = lc->int_p_cs_precedes;
		*sep_by_space = lc->int_p_sep_by_space;
		*sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_p_sign_posn;
		*signstr = lc->positive_sign;
	} else if (flags & IS_NEGATIVE) {
		*cs_precedes = lc->n_cs_precedes;
		*sep_by_space = lc->n_sep_by_space;
		*sign_posn = (flags & PARENTH_POSN) ? 0 : lc->n_sign_posn;
		*signstr = (lc->negative_sign == '\0') ? "-"
		    : lc->negative_sign;
	} else {
		*cs_precedes = lc->p_cs_precedes;
		*sep_by_space = lc->p_sep_by_space;
		*sign_posn = (flags & PARENTH_POSN) ? 0 : lc->p_sign_posn;
		*signstr = lc->positive_sign;
	}

	/* Set defult values for unspecified information. */
	if (*cs_precedes != 0)
		*cs_precedes = 1;
	if (*sep_by_space == CHAR_MAX)
		*sep_by_space = 0;
	if (*sign_posn == CHAR_MAX)
		*sign_posn = 0;
}

static int
__calc_left_pad(int flags, char *cur_symb) {

	char cs_precedes, sep_by_space, sign_posn;
	const char *signstr;
	int left_chars = 0;

	__setup_vars(flags, &cs_precedes, &sep_by_space, &sign_posn, &signstr);

	if (cs_precedes != 0) {
		left_chars += strlen(cur_symb);
		if (sep_by_space != 0)
			left_chars++;
	}

	switch (sign_posn) {
		case 1:
			left_chars += strlen(signstr);
			break;
		case 3:
		case 4:
			if (cs_precedes != 0)
				left_chars += strlen(signstr);
	}
	return (left_chars);
}

static int
get_groups(int size, char *grouping) {

	int	chars = 0;

	if (*grouping == CHAR_MAX || *grouping <= 0)	/* no grouping ? */
		return (0);

	while (size > (int)*grouping) {
		chars++;
		size -= (int)*grouping++;
		/* no more grouping ? */
		if (*grouping == CHAR_MAX)
			break;
		/* rest grouping with same value ? */
		if (*grouping == 0) {
			chars += (size - 1) / *(grouping - 1);
			break;
		}
	}
	return (chars);
}

/* convert double to ASCII */
static char *
__format_grouped_double(double value, int *flags,
			int left_prec, int right_prec, int pad_char) {

	char		*rslt;
	char		*avalue;
	int		avalue_size;
	char		fmt[32];

	size_t		bufsize;
	char		*bufend;

	int		padded;

	struct lconv	*lc = localeconv();
	char		*grouping;
	char		decimal_point;
	char		thousands_sep;

	int groups = 0;

	grouping = lc->mon_grouping;
	decimal_point = *lc->mon_decimal_point;
	if (decimal_point == '\0')
		decimal_point = *lc->decimal_point;
	thousands_sep = *lc->mon_thousands_sep;
	if (thousands_sep == '\0')
		thousands_sep = *lc->thousands_sep;

	/* fill left_prec with default value */
	if (left_prec == -1)
		left_prec = 0;

	/* fill right_prec with default value */
	if (right_prec == -1) {
                if (*flags & USE_INTL_CURRENCY)
                        right_prec = lc->int_frac_digits;
                else
                        right_prec = lc->frac_digits;

		if (right_prec == CHAR_MAX)	/* POSIX locale ? */
			right_prec = 2;
	}

	if (*flags & NEED_GROUPING)
		left_prec += get_groups(left_prec, grouping);

	/* convert to string */
	snprintf(fmt, sizeof(fmt), "%%%d.%df", left_prec + right_prec + 1,
	    right_prec);
	avalue_size = asprintf(&avalue, fmt, value);
	if (avalue_size < 0)
		return (NULL);

	/* make sure that we've enough space for result string */
	bufsize = strlen(avalue)*2+1;
	rslt = malloc(bufsize);
	if (rslt == NULL) {
		free(avalue);
		return (NULL);
	}
	memset(rslt, 0, bufsize);
	bufend = rslt + bufsize - 1;	/* reserve space for trailing '\0' */

	/* skip spaces at beggining */
	padded = 0;
	while (avalue[padded] == ' ') {
		padded++;
		avalue_size--;
	}

	if (right_prec > 0) {
		bufend -= right_prec;
		memcpy(bufend, avalue + avalue_size+padded-right_prec,
		    (size_t) right_prec);
		*--bufend = decimal_point;
		avalue_size -= (right_prec + 1);
	}

	if ((*flags & NEED_GROUPING) &&
	    thousands_sep != '\0' &&	/* XXX: need investigation */
	    *grouping != CHAR_MAX &&
	    *grouping > 0) {
		while (avalue_size > (int)*grouping) {
			GRPCPY(*grouping);
			GRPSEP;
			grouping++;

			/* no more grouping ? */
			if (*grouping == CHAR_MAX)
				break;

			/* rest grouping with same value ? */
			if (*grouping == 0) {
				grouping--;
				while (avalue_size > *grouping) {
					GRPCPY(*grouping);
					GRPSEP;
				}
			}
		}
		if (avalue_size != 0)
			GRPCPY(avalue_size);
		padded -= groups;

	} else {
		bufend -= avalue_size;
		memcpy(bufend, avalue+padded, (size_t) avalue_size);
		if (right_prec == 0)
			padded--;	/* decrease assumed $decimal_point */
	}

	/* do padding with pad_char */
	if (padded > 0) {
		bufend -= padded;
		memset(bufend, pad_char, (size_t) padded);
	}

	bufsize = bufsize - (bufend - rslt) + 1;
	memmove(rslt, bufend, bufsize);
	free(avalue);
	return (rslt);
}
Commit	Line	Data
b5d655f7 A	1	/* $NetBSD: strfmon.c,v 1.6 2008/03/27 21:50:30 christos Exp $ */
b5d655f7 A	2
9385eb3d A	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>
b5d655f7 A	31	#if defined(LIBC_SCCS) && !defined(lint)
b5d655f7 A	32	#if 0
9385eb3d	33	__FBSDID("$FreeBSD: src/lib/libc/stdlib/strfmon.c,v 1.14 2003/03/20 08:18:55 ache Exp $");
b5d655f7 A	34	#else
	35	__RCSID("$NetBSD: strfmon.c,v 1.6 2008/03/27 21:50:30 christos Exp $");
	36	#endif
	37	#endif /* LIBC_SCCS and not lint */
	38
	39	#if defined(__NetBSD__)
	40	#include "namespace.h"
	41	#include <monetary.h>
	42	#endif
9385eb3d A	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>
b5d655f7	53	#include <stddef.h>
9385eb3d A	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; \
b5d655f7	70	} while (/* CONSTCOND */ 0)
9385eb3d A	71
9385eb3d A	72	#define PRINTS(STR) do { \
b5d655f7	73	const char *tmps = STR; \
9385eb3d A	74	while (*tmps != '\0') \
9385eb3d A	75	PRINT(*tmps++); \
b5d655f7	76	} while (/* CONSTCOND */ 0)
9385eb3d A	77
	78	#define GET_NUMBER(VAR) do { \
	79	VAR = 0; \
	80	while (isdigit((unsigned char)*fmt)) { \
	81	VAR *= 10; \
	82	VAR += *fmt - '0'; \
b5d655f7 A	83	if (VAR > 0x00ffffff) \
b5d655f7 A	84	goto e2big_error; \
9385eb3d A	85	fmt++; \
9385eb3d A	86	} \
b5d655f7	87	} while (/* CONSTCOND */ 0)
9385eb3d A	88
	89	#define GRPCPY(howmany) do { \
	90	int i = howmany; \
	91	while (i-- > 0) { \
	92	avalue_size--; \
	93	--bufend = (avalue+avalue_size+padded); \
	94	} \
b5d655f7	95	} while (/* CONSTCOND */ 0)
9385eb3d A	96
	97	#define GRPSEP do { \
	98	*--bufend = thousands_sep; \
	99	groups++; \
b5d655f7	100	} while (/* CONSTCOND */ 0)
9385eb3d	101
b5d655f7	102	static void __setup_vars(int, char , char , char , const char *);
9385eb3d A	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,
9385eb3d	128	*currency_symbol;
b5d655f7	129	const char *signstr;
9385eb3d A	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 */
b5d655f7	167	while (/* CONSTCOND */ 1) {
9385eb3d A	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)) {
b5d655f7	201	ptrdiff_t d = dst - s;
9385eb3d A	202	GET_NUMBER(width);
	203	/* Do we have enough space to put number with
	204	* required width ?
	205	*/
b5d655f7 A	206
b5d655f7 A	207	if (d + width >= maxsize)
9385eb3d A	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
b5d655f7 A	238	if (currency_symbol)
b5d655f7 A	239	free(currency_symbol);
9385eb3d A	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,
b5d655f7 A	381	(size_t) pad_size);
b5d655f7 A	382	memset(tmpptr, ' ', (size_t) width-pad_size);
9385eb3d A	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,
b5d655f7	414	char sign_posn, const char *signstr) {
9385eb3d A	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
b5d655f7 A	453	char cs_precedes, sep_by_space, sign_posn;
b5d655f7 A	454	const char *signstr;
9385eb3d A	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,
b5d655f7	575	(size_t) right_prec);
9385eb3d A	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;
b5d655f7	608	memcpy(bufend, avalue+padded, (size_t) avalue_size);
9385eb3d A	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;
b5d655f7	616	memset(bufend, pad_char, (size_t) padded);
9385eb3d A	617	}
	618
	619	bufsize = bufsize - (bufend - rslt) + 1;
	620	memmove(rslt, bufend, bufsize);
	621	free(avalue);
	622	return (rslt);
	623	}