Ubuntu Manpage: strfmon, strfmon_l - convert monetary value to a string

NAME

       strfmon, strfmon_l - convert monetary value to a string

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <monetary.h>

       ssize_t strfmon(char s[restrict .max], size_t max,
                       const char *restrict format, ...);
       ssize_t strfmon_l(char s[restrict .max], size_t max, locale_t locale,
                       const char *restrict format, ...);

DESCRIPTION

The strfmon() function formats the specified monetary amount according to the current
locale and format specification format and places the result in the character array s of
size max.

The strfmon_l() function performs the same task, but uses the locale specified by locale.
The behavior of strfmon_l() is undefined if locale is the special locale object
LC_GLOBAL_LOCALE (see duplocale(3)) or is not a valid locale object handle.

Ordinary characters in format are copied to s without conversion. Conversion specifiers
are introduced by a '%' character. Immediately following it there can be zero or more of
the following flags:

=f The single-byte character f is used as the numeric fill character (to be used with
a left precision, see below). When not specified, the space character is used.

^ Do not use any grouping characters that might be defined for the current locale.
By default, grouping is enabled.

( or + The ( flag indicates that negative amounts should be enclosed between parentheses.
The + flag indicates that signs should be handled in the default way, that is,
amounts are preceded by the locale's sign indication, for example, nothing for
positive, "-" for negative.

! Omit the currency symbol.

- Left justify all fields. The default is right justification.

Next, there may be a field width: a decimal digit string specifying a minimum field width
in bytes. The default is 0. A result smaller than this width is padded with spaces (on
the left, unless the left-justify flag was given).

Next, there may be a left precision of the form "#" followed by a decimal digit string.
If the number of digits left of the radix character is smaller than this, the
representation is padded on the left with the numeric fill character. Grouping characters
are not counted in this field width.

Next, there may be a right precision of the form "." followed by a decimal digit string.
The amount being formatted is rounded to the specified number of digits prior to
formatting. The default is specified in the frac_digits and int_frac_digits items of the
current locale. If the right precision is 0, no radix character is printed. (The radix
character here is determined by LC_MONETARY, and may differ from that specified by
LC_NUMERIC.)

Finally, the conversion specification must be ended with a conversion character. The
three conversion characters are

% (In this case, the entire specification must be exactly "%%".) Put a '%' character
in the result string.

i One argument of type double is converted using the locale's international currency
format.

n One argument of type double is converted using the locale's national currency
format.

RETURN VALUE

       The strfmon() function returns the number  of  characters  placed  in  the  array  s,  not
       including  the  terminating null byte, provided the string, including the terminating null
       byte, fits.  Otherwise, it sets errno to E2BIG, returns -1, and the contents of the  array
       is undefined.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       ┌────────────────────────────────────────────────────────┬───────────────┬────────────────┐
       │Interface                                               │ Attribute     │ Value          │
       ├────────────────────────────────────────────────────────┼───────────────┼────────────────┤
       │strfmon()                                               │ Thread safety │ MT-Safe locale │
       ├────────────────────────────────────────────────────────┼───────────────┼────────────────┤
       │strfmon_l()                                             │ Thread safety │ MT-Safe        │
       └────────────────────────────────────────────────────────┴───────────────┴────────────────┘

STANDARDS

       POSIX.1-2001, POSIX.1-2008.

EXAMPLES

       The call

           strfmon(buf, sizeof(buf), "[%^=*#6n] [%=*#6i]",
                   1234.567, 1234.567);

       outputs

           [€ **1234,57] [EUR **1 234,57]

       in the nl_NL locale.  The de_DE, de_CH, en_AU, and en_GB locales yield

           [ **1234,57 €] [ **1.234,57 EUR]
           [ Fr. **1234.57] [ CHF **1'234.57]
           [ $**1234.57] [ AUD**1,234.57]
           [ £**1234.57] [ GBP**1,234.57]