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.\" Copyright (c) 2001 Markus Kuhn <mkuhn@acm.org>
.\"
.\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA)
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\" %%%LICENSE_END
.\"
.\" References consulted:
.\" GNU glibc-2 manual
.\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
.\"
.\" Corrected prototype, 2002-10-18, aeb
.\"
.TH NL_LANGINFO 3 2010-10-03 "GNU" "Linux Programmer's Manual"
.SH NAME
nl_langinfo \- query language and locale information
.SH SYNOPSIS
.nf
.B #include <langinfo.h>
.sp
.BI "char *nl_langinfo(nl_item " item );
.fi
.SH DESCRIPTION
The
.BR nl_langinfo ()
function provides access to locale information
in a more flexible way than
.BR localeconv (3)
does.
Individual and additional elements of the locale categories can
be queried.
.PP
Examples for the locale elements that can be specified in \fIitem\fP
using the constants defined in \fI<langinfo.h>\fP are:
.TP
.BR CODESET \ (LC_CTYPE)
Return a string with the name of the character encoding used in the
selected locale, such as "UTF-8", "ISO-8859-1", or "ANSI_X3.4-1968"
(better known as US-ASCII).
This is the same string that you get with
"locale charmap".
For a list of character encoding names,
try "locale \-m", cf.\&
.BR locale (1).
.TP
.BR D_T_FMT \ (LC_TIME)
Return a string that can be used as a format string for
.BR strftime (3)
to represent time and date in a locale-specific way.
.TP
.BR D_FMT \ (LC_TIME)
Return a string that can be used as a format string for
.BR strftime (3)
to represent a date in a locale-specific way.
.TP
.BR T_FMT \ (LC_TIME)
Return a string that can be used as a format string for
.BR strftime (3)
to represent a time in a locale-specific way.
.TP
.BR DAY_ "{1\(en7} (LC_TIME)"
Return name of the \fIn\fP-th day of the week. [Warning: this follows
the US convention DAY_1 = Sunday, not the international convention
(ISO 8601) that Monday is the first day of the week.]
.TP
.BR ABDAY_ "{1\(en7} (LC_TIME)"
Return abbreviated name of the \fIn\fP-th day of the week.
.TP
.BR MON_ "{1\(en12} (LC_TIME)"
Return name of the \fIn\fP-th month.
.TP
.BR ABMON_ "{1\(en12} (LC_TIME)"
Return abbreviated name of the \fIn\fP-th month.
.TP
.BR RADIXCHAR \ (LC_NUMERIC)
Return radix character (decimal dot, decimal comma, etc.).
.TP
.BR THOUSEP \ (LC_NUMERIC)
Return separator character for thousands (groups of three digits).
.TP
.BR YESEXPR \ (LC_MESSAGES)
Return a regular expression that can be used with the
.BR regex (3)
function to recognize a positive response to a yes/no question.
.TP
.BR NOEXPR \ (LC_MESSAGES)
Return a regular expression that can be used with the
.BR regex (3)
function to recognize a negative response to a yes/no question.
.TP
.BR CRNCYSTR \ (LC_MONETARY)
Return the currency symbol, preceded by "\-" if the symbol should
appear before the value, "+" if the symbol should appear after the
value, or "." if the symbol should replace the radix character.
.PP
The above list covers just some examples of items that can be requested.
For a more detailed list, consult
.IR "The GNU C Library Reference Manual" .
.SH RETURN VALUE
If no locale has been selected by
.BR setlocale (3)
for the appropriate category,
.BR nl_langinfo ()
returns a pointer to the corresponding string in the
"C" locale.
.PP
If \fIitem\fP is not valid, a pointer to an empty string is returned.
.PP
This pointer may point to static data that may be overwritten on the
next call to
.BR nl_langinfo ()
or
.BR setlocale (3).
.SH CONFORMING TO
SUSv2, POSIX.1-2001.
.SH EXAMPLE
The following program sets the character type locale according to the
environment and queries the terminal character set.
.LP
.nf
#include <langinfo.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
int
main(int argc, char *argv[])
{
setlocale(LC_CTYPE,"");
printf("%s\\n",nl_langinfo(CODESET));
exit(EXIT_SUCCESS);
}
.fi
.SH SEE ALSO
.BR locale (1),
.BR localeconv (3),
.BR setlocale (3),
.BR charsets (7),
.BR locale (7)
.br
The GNU C Library Reference Manual
|
