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Common Development and Distribution License ("CDDL"), version 1.0.
You may only use this file in accordance with the terms of version
1.0 of the CDDL.

A full copy of the text of the CDDL should have accompanied this
source. A copy of the CDDL is also available via the Internet at
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Copyright 2014 Garrett D'Amore <garrett@damore.org>

strfmon, strfmon_l - convert monetary values to string

#include <monetary.h>

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

ssize_t strfmon_l(char *restrict s, size_t maxsize,
 locale_t loc, const char *restrict format, ...);

These functions are used to format strings containing numeric quantities using rules that are specific to a given locale. For example, in the United States, currencies are formatted using the dollar sign ( $ ) and include two decimal digits (cents).

Each character from the format is copied to the output buffer supplied by s . Furthermore, when a percent ( % ) character is encountered, this triggers an expansion, as follows:

Immediately following the % character there shall be zero or more flags, as indicated below:

= f An equals sign followed by a character f is the numeric fill character, which must be a single byte. The default fill character is <space>.

^ The carat suppresses the use of grouping characters, even if the locale indicates their use.

+ The plus sign indicates that positive and negative numbers should use the locale's positive and negative signs. This may not be used with the open parenthesis. This behavior is default.

( The open parenthesis indicates that negative numbers should be enclosed within parenthesis, and no special formatting should be applied to positive values. This may not be supplied with the plus sign flag.

! The exclamation point suppresses the output of any currency symbol.

- The dash specifies that numeric values should be left-justified within a field width, if a field width is specified.

Next there may appear an optional minimum field width, specified as a string of decimal digits, indicating a minimum width in bytes of this fields.

Next there may appear a left precision, as # p , indicating the maximum number of digits expected to appear left of the radix character. (If a numeric value does not require this many places, including grouping separators, then the numeric fill character is used to pad the value to this many places.)

Next there may appear a right precision, as . p , indicating the minimum number of digits to appear to to the right of the radix character. If the value of p is zero, then the radix character is also suppressed.

Finally there shall appear one of the following conversion specifier characters:

i The next available argument (assumed to be double ) is formatted, using the locale's international currency format. For example, in the United States, the output might look like "USD 1,234.56".

n The next available argument (assumed to be double ) is formatted, using the locale's national currency format. For example, in the United States, the output might look like "$1,234.56".

% A single percent character is emitted. In this case, the entire specifier shall be %% .

Whereas the strfmon() function uses the current locale, the strfmon_l() function uses the supplied locale loc .

If the conversion was successfully performed, and the entire result (including the terminating null character) fits in maxsize bytes, then the number of bytes placed in the buffer (excluding the terminating null character) is returned.

If the result of expansion exceeds maxsize bytes, then the value -1 is returned, and errno is set to E2BIG .

The result of formatting a value that is not a rational number (e.g. +NaN) is unspecified.

See attributes (7) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

CSI Enabled

Interface Stability Standard

MT-Level MT-Safe

setlocale (3C), uselocale (3C), locale (3HEAD), attributes (7), standards (7)