diff --git a/lib/libc/stdlib/strfmon.3 b/lib/libc/stdlib/strfmon.3 index 924c82109a68..1ddfb77cb0ac 100644 --- a/lib/libc/stdlib/strfmon.3 +++ b/lib/libc/stdlib/strfmon.3 @@ -1,192 +1,217 @@ .\" Copyright (c) 2001 Jeroen Ruigrok van der Werven .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" $FreeBSD$ .\" .Dd October 28, 2022 .Dt STRFMON 3 .Os .Sh NAME .Nm strfmon , .Nm strfmon_l .Nd convert monetary value to string .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In monetary.h .Ft ssize_t .Fn strfmon "char * restrict s" "size_t maxsize" "const char * restrict format" "..." .Ft ssize_t .Fn strfmon_l "char * restrict s" "size_t maxsize" "locale_t loc" "const char * restrict format" "..." .Sh DESCRIPTION The .Fn strfmon function places characters into the array pointed to by .Fa s as controlled by the string pointed to by .Fa format . No more than .Fa maxsize bytes are placed into the array. .Pp The .Fn strfmon_l function does the same as .Fn strfmon but takes an explicit locale rather than using the current locale. .Pp The format string is composed of zero or more directives: ordinary characters (not .Cm % ) , which are copied unchanged to the output stream; and conversion specifications, each of which results in fetching zero or more subsequent arguments. Each conversion specification is introduced by the .Cm % character. After the .Cm % , the following appear in sequence: .Bl -bullet .It Zero or more of the following flags: .Bl -tag -width "XXX" .It Cm = Ns Ar f A .Sq Cm = character followed by another character .Ar f which is used as the numeric fill character. .It Cm ^ Do not use grouping characters, regardless of the current locale default. .It Cm + Represent positive values by prefixing them with a positive sign, and negative values by prefixing them with a negative sign. This is the default. .It Cm \&( Enclose negative values in parentheses. .It Cm \&! Do not include a currency symbol in the output. .It Cm \- Left justify the result. Only valid when a field width is specified. .El .It An optional minimum field width as a decimal number. By default, there is no minimum width. .It A .Sq Cm # sign followed by a decimal number specifying the maximum expected number of digits before the radix character. When this option is used, values that do not exceed the specified number of digits are formatted so they will be correctly aligned with other values printed using the same format. This includes always leaving space for a possible sign indicator, even if none is needed for a particular value. .It A .Sq Cm \&. character followed by a decimal number specifying the number of digits after the radix character. .It One of the following conversion specifiers: .Bl -tag -width "XXX" .It Cm i The .Vt double argument is formatted as an international monetary amount. .It Cm n The .Vt double argument is formatted as a national monetary amount. .It Cm % A .Sq Li % character is written. .El .El .Sh RETURN VALUES If the total number of resulting bytes including the terminating .Dv NUL byte is not more than .Fa maxsize , .Fn strfmon returns the number of bytes placed into the array pointed to by .Fa s , not including the terminating .Dv NUL byte. Otherwise, \-1 is returned, the contents of the array are indeterminate, and .Va errno is set to indicate the error. .Pp The .Fn strfmon_l function returns the same values as .Fn strfmon . +.Sh EXAMPLES +The following example will format the value +.Dq Li 1234567.89 +to the string +.Dq Li $1,234,567.89 : +.Bd -literal -offset indent +#include +#include +#include + +int +main() +{ + char string[100]; + double money = 1234567.89; + + if (setlocale(LC_MONETARY, "en_US.UTF-8") == NULL) { + fprintf(stderr, "Unable to setlocale().\\n"); + return (1); + } + + strfmon(string, sizeof(string) - 1, "%n", money); + printf("%s\\n", string); +} +.Ed .Sh ERRORS The .Fn strfmon function will fail if: .Bl -tag -width Er .It Bq Er E2BIG Conversion stopped due to lack of space in the buffer. .It Bq Er EINVAL The format string is invalid. .It Bq Er ENOMEM Not enough memory for temporary buffers. .El .Sh SEE ALSO .Xr localeconv 3 , .Xr xlocale 3 .Sh STANDARDS The .Fn strfmon function conforms to .St -p1003.1-2001 . The .Fn strfmon_l function conforms to .St -p1003.1-2008 . .Sh AUTHORS .An -nosplit The .Fn strfmon function was implemented by .An Alexey Zelkin Aq Mt phantom@FreeBSD.org . .Pp This manual page was written by .An Jeroen Ruigrok van der Werven Aq Mt asmodai@FreeBSD.org based on the standards' text. .Sh BUGS The .Fn strfmon function does not correctly handle multibyte characters in the .Fa format argument.