mirror of https://github.com/mkerrisk/man-pages
112 lines
3.7 KiB
Groff
112 lines
3.7 KiB
Groff
.\" Copyright (c) 2001 Markus Kuhn <mkuhn@acm.org>
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" References consulted:
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.\" GNU glibc-2 manual
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.\" OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
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.\"
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.\" Corrected prototype, 2002-10-18, aeb
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.\"
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.TH NL_LANGINFO 3 2001-05-11 "GNU" "Linux Programmer's Manual"
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.SH NAME
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nl_langinfo \- query language and locale information
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.SH SYNOPSIS
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.nf
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.B #include <langinfo.h>
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.sp
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.BI "char *nl_langinfo(nl_item " item );
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.fi
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.SH DESCRIPTION
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The \fBnl_langinfo\fP() function provides access to locale information
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in a more flexible way than
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.BR localeconv (3)
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does. Individual and additional elements of the locale categories can
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be queried.
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.PP
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Examples for the locale elements that can be specified in \fIitem\fP
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using the constants defined in <langinfo.h> are:
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.TP
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.BR CODESET \ (LC_CTYPE)
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Return a string with the name of the character encoding used in the
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selected locale, such as "UTF-8", "ISO-8859-1", or "ANSI_X3.4-1968"
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(better known as US-ASCII). This is the same string that you get with
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"locale charmap". For a list of character encoding names,
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try "locale \-m", cf.\&
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.BR locale (1).
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.TP
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.BR D_T_FMT \ (LC_TIME)
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Return a string that can be used as a format string for
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.BR strftime (3)
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to represent time and date in a locale-specific way.
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.TP
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.BR D_FMT \ (LC_TIME)
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Return a string that can be used as a format string for
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.BR strftime (3)
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to represent a date in a locale-specific way.
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.TP
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.BR T_FMT \ (LC_TIME)
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Return a string that can be used as a format string for
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.BR strftime (3)
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to represent a time in a locale-specific way.
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.TP
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.BR DAY_ "{1\(en7} (LC_TIME)"
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Return name of the \fIn\fP-th day of the week. [Warning: this follows
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the US convention DAY_1 = Sunday, not the international convention
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(ISO 8601) that Monday is the first day of the week.]
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.TP
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.BR ABDAY_ "{1\(en7} (LC_TIME)"
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Return abbreviated name of the \fIn\fP-th day of the week.
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.TP
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.BR MON_ "{1\(en12} (LC_TIME)"
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Return name of the \fIn\fP-th month.
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.TP
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.BR ABMON_ "{1\(en12} (LC_TIME)"
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Return abbreviated name of the \fIn\fP-th month.
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.TP
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.BR RADIXCHAR \ (LC_NUMERIC)
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Return radix character (decimal dot, decimal comma, etc.).
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.TP
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.BR THOUSEP \ (LC_NUMERIC)
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Return separator character for thousands (groups of three digits).
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.TP
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.BR YESEXPR \ (LC_MESSAGES)
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Return a regular expression that can be used with the
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.BR regex (3)
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function to recognize a positive response to a yes/no question.
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.TP
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.BR NOEXPR \ (LC_MESSAGES)
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Return a regular expression that can be used with the
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.BR regex (3)
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function to recognize a negative response to a yes/no question.
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.TP
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.BR CRNCYSTR \ (LC_MONETARY)
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Return the currency symbol, preceded by "\-" if the symbol should
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appear before the value, "+" if the symbol should appear after the
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value, or "." if the symbol should replace the radix character.
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.PP
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The above list covers just some examples of items that can be requested.
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For a more detailed list, consult
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.IR "The GNU C Library Reference Manual" .
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.SH "RETURN VALUE"
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If no locale has been selected for the appropriate category,
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\fBnl_langinfo\fP() returns a pointer to the corresponding string in the
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"C" locale.
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.PP
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If \fIitem\fP is not valid, a pointer to an empty string is returned.
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.PP
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This pointer may point to static data that may be overwritten on the
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next call to \fBnl_langinfo\fP() or \fBsetlocale\fP().
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.SH "CONFORMING TO"
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SUSv2, POSIX.1-2001.
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.SH "SEE ALSO"
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.BR locale (1),
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.BR localeconv (3),
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.BR setlocale (3),
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.BR charsets (7),
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.BR locale (7)
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The GNU C Library Reference Manual
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