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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.
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, e.g., nothing for positive, "-" for
! 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.
The strfmon() function returns the number of characters placed in the
array s, not including the terminating NUL character, provided the
string, including the terminating NUL, fits. Otherwise, it sets errno
to E2BIG, returns -1, and the contents of the array is undefined.
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,
Australian, 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)