strfmon(3) Library Functions Manual strfmon(3)
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 re-
sult 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. 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 character
(to be used with a left precision, see below). When not speci-
fied, 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 be-
tween 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 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
field width.
Next, there may be a right precision of the form "." followed by a deci-
mal 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 charac-
ter here is determined by LC_MONETARY, and may differ from that speci-
fied 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 in-
ternational currency format.
n One argument of type double is converted using the locale's na-
tional 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.1-2008.
HISTORY
POSIX.1-2001.
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]
SEE ALSO
duplocale(3), setlocale(3), sprintf(3), locale(7)
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