ssize_t strfmon(char *s, size_t max, const char *format, ...);
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:
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
strfmon(buf, sizeof(buf), "[%^=*#6n] [%=*#6i]", 1234.567, 1234.567);outputs
[ 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 ]