STRFMON(3) Linux Programmer's Manual STRFMON(3)
strfmon - convert monetary value to a string
ssize_t strfmon(char *s, size_t max, const char *format, ...);
The strfmon() function formats the specified amounts according to the
format specification format and places the result in the character
array s of size max.
Ordinary characters in format are copied to s without conversion. Con-
version specifiers are introduced by a '%' character. Immediately fol-
lowing it there can be zero or more of the following flags:
=f The single-byte character f is used as the numeric fill charac-
ter (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, "-"
! 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 deci-
mal 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
Next, there may be a right precision of the form "." followed by a dec-
imal digit string. The amount being formatted is rounded to the speci-
fied 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.
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.
Not in POSIX.1-2001. Present on several other systems.
strfmon(buf, sizeof(buf), "[%^=*#6n] [%=*#6i]",
[ fl **1234,57] [ NLG **1 234,57]
in the Dutch locale (with fl for "florijnen" and NLG for Netherlands
Guilders). The grouping character is very ugly because it takes as
much space as a digit, while it should not take more than half that,
and will no doubt cause confusion. Surprisingly, the "fl" is preceded
and followed by a space, and "NLG" is preceded by one and followed by
two spaces. This may be a bug in the locale files. The Italian, Aus-
tralian, Swiss and Portuguese locales yield
[ L. **1235] [ ITL **1.235]
[ $**1234.57] [ AUD **1,234.57]
[Fr. **1234,57] [CHF **1.234,57]
[ **1234$57Esc] [ **1.234$57PTE ]
setlocale(3), sprintf(3), locale(7)
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Linux 2000-12-05 STRFMON(3)