strfmon(3)



STRFMON(3)                 Linux Programmer's Manual                STRFMON(3)

NAME
       strfmon, strfmon_l - convert monetary value to a string

SYNOPSIS
       #include <monetary.h>

       ssize_t strfmon(char *s, size_t max, const char *format,
       ...);

       ssize_t strfmon_l(char *s, size_t max, locale_t locale,
       const char *" 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.  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, "-"
              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 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.

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        |
       +------------+---------------+----------------+

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

EXAMPLE
       The call

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

       outputs

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

SEE ALSO
       duplocale(3), setlocale(3), sprintf(3), locale(7)

COLOPHON
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       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       https://www.kernel.org/doc/man-pages/.

Linux                             2017-09-15                        STRFMON(3)

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