STRFMON(3)

NAME
strfmon, strfmon_l - convert monetary value to string

LIBRARY
libc

SYNOPSIS
#include <monetary.h>
ssize_t
strfmon(char * restrict s, size_t maxsize, const char * restrict format, ...);
#include <monetary.h>
#include <xlocale.h>
ssize_t
strfmon_l(char * restrict s, size_t maxsize, locale_t loc, const char * restrict format, ...);

DESCRIPTION
The strfmon() function places characters into the array pointed to by s, as controlled by the string pointed to by format. No more than maxsize bytes are placed into the array.

The strfmon_l() function takes an explicit locale argument, whereas the strfmon() function uses the current global or per-thread locale.

The format string is composed of zero or more directives: ordinary characters (not %), which are copied unchanged to the output stream; and conversion specifications, each of which results in fetching zero or more subsequent arguments. Each conversion specification is introduced by the % character. After the %, the following appear in sequence:

•   Zero or more of the following flags:

    =f  A ‘=’ character followed by another character f which is used as the numeric fill character.

    ^   Do not use grouping characters, regardless of the current locale default.

    +   Represent positive values by prefixing them with a positive sign, and negative values by prefixing them with a negative sign. This is the default.

    (   Enclose negative values in parentheses.

    !   Do not include a currency symbol in the output.

    -   Left justify the result. Only valid when a field width is specified.

•   An optional minimum field width as a decimal number. By default, there is no minimum width.

•   A ‘#’ sign followed by a decimal number specifying the maximum expected number of digits before the radix character. When this option is used, values that do not exceed the specified number of digits are formatted so they will be correctly aligned with other values printed using the same format. This includes always leaving space for a possible sign indicator, even if none is needed for a particular value.

•   A ‘’. character followed by a decimal number specifying the number of digits after the radix character.

•   One of the following conversion specifiers:

    i   The double argument is formatted as an international monetary amount.

    n   The double argument is formatted as a national monetary amount.

    %   A ‘%’ character is written.

RETURN VALUES
If the total number of resulting bytes, including the terminating NUL byte, is not more than maxsize, strfmon() and strfmon_l() return the number of bytes placed into the array pointed to by s, not including the terminating NUL byte. Otherwise, -1 is returned, the contents of the array are indeterminate, and errno is set to indicate the error.

EXAMPLES
The following example will format the value “1234567.89” to the string “$1,234,567.89”:

    #include <stdio.h>
    #include <monetary.h>
    #include <locale.h>
    int
    main(void)
    {
    	char string[100];
    	double money = 1234567.89;
    	if (setlocale(LC_MONETARY, "en_US.UTF-8") == NULL) {
    		fprintf(stderr, "Unable to setlocale().\n");
    		return (1);
    	}
    	strfmon(string, sizeof(string) - 1, "%n", money);
    	printf("%s\n", string);
    	return (0);
    }

ERRORS
The strfmon() function will fail if:

[E2BIG]
    Conversion stopped due to lack of space in the buffer.

[EINVAL]
    The format string is invalid.

[EINVAL]
    The + flag was included in a conversion specification and the locale's positive_sign and negative_sign values would both be returned by localeconv(3) as empty strings.

[ENOMEM]
    Not enough memory for temporary buffers.

SEE ALSO
localeconv(3), xlocale(3)

STANDARDS
The strfmon() function conforms to p1003.1-2001. The strfmon_l() function conforms to p1003.1-2008.

AUTHORS
-nosplit The strfmon() function was implemented by Alexey Zelkin <phantom@FreeBSD.org>.

This manual page was written by Jeroen Ruigrok van der Werven <asmodai@FreeBSD.org> based on the standards' text.

BUGS
The strfmon() function does not correctly handle multibyte characters in the format argument.