mirror of https://github.com/mkerrisk/man-pages
190 lines
5.8 KiB
Groff
190 lines
5.8 KiB
Groff
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.\" (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
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.\" and 1999 by Bruno Haible (haible@clisp.cons.org)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" License.
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.\" Modified Sat Jul 24 18:20:12 1993 by Rik Faith (faith@cs.unc.edu)
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.\" Modified Tue Jul 15 16:49:10 1997 by Andries Brouwer (aeb@cwi.nl)
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.\" Modified Sun Jul 4 14:52:16 1999 by Bruno Haible (haible@clisp.cons.org)
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.\" Modified Tue Aug 24 17:11:01 1999 by Andries Brouwer (aeb@cwi.nl)
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.\" Modified Tue Feb 6 03:31:55 2001 by Andries Brouwer (aeb@cwi.nl)
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.\"
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.TH SETLOCALE 3 1999-07-04 "GNU" "Linux Programmer's Manual"
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.SH NAME
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setlocale \- set the current locale
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.SH SYNOPSIS
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.nf
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.B #include <locale.h>
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.sp
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.BI "char *setlocale(int " category ", const char *" locale );
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.fi
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.SH DESCRIPTION
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The
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.B setlocale()
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function is used to set or query the program's current locale.
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.PP
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If
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.I locale
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is not
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.BR NULL ,
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the program's current locale is modified according to the arguments.
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The argument
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.I category
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determines which parts of the program's current locale should be modified.
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.TP
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.B LC_ALL
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for all of the locale.
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.TP
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.B LC_COLLATE
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for regular expression matching (it determines the meaning
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of range expressions and equivalence classes) and string collation.
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.TP
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.B LC_CTYPE
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for regular expression matching, character classification, conversion,
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case-sensitive comparison, and wide character functions.
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.TP
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.B LC_MESSAGES
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for localizable natural-language messages.
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.TP
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.B LC_MONETARY
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for monetary formatting.
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.TP
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.B LC_NUMERIC
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for number formatting (such as the decimal point and the thousands separator).
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.TP
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.B LC_TIME
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for time and date formatting.
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.PP
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The argument
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.I locale
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is a pointer to a character string containing the
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required setting of
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.IR category .
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Such a string is either a well-known constant like "C" or "da_DK"
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(see below), or an opaque string that was returned by another call of
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.BR setlocale .
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.PP
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If
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.I locale
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is
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.BR """""" ,
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each part of the locale that should be modified is set according to the
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environment variables. The details are implementation dependent.
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For glibc, first
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.\" [This is false on my system - must check which library versions do this]
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.\" if
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.\" .I category
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.\" is LC_MESSAGES, the environment variable LANGUAGE is inspected,
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.\" then
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(regardless of
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.IR category ),
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the environment variable LC_ALL is inspected,
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next the environment variable with the same name as the category
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(LC_COLLATE, LC_CTYPE, LC_MESSAGES, LC_MONETARY, LC_NUMERIC, LC_TIME)
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and finally the environment variable LANG.
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The first existing environment variable is used.
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If its value is not a valid locale specification, the locale
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is unchanged, and
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.B setlocale
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returns NULL.
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.\" The environment variable LANGUAGE may contain several, colon-separated,
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.\" locale names.
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.PP
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The locale
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.B """C"""
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or
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.B """POSIX"""
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is a portable locale; its LC_CTYPE part corresponds to the 7-bit ASCII
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character set.
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.PP
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A locale name is typically of the form
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.IR language "[_" territory "][." codeset "][@" modifier "],"
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where
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.I language
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is an ISO 639 language code,
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.I territory
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is an ISO 3166 country code, and
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.I codeset
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is a character set or encoding identifier like
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.B "ISO-8859-1"
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or
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.BR "UTF-8" .
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For a list of all supported locales, try "locale -a", cf.\&
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.BR locale (1).
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.PP
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If
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.I locale
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is
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.BR NULL ,
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the current locale is only queried, not modified.
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.PP
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On startup of the main program, the portable
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.B """C"""
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locale is selected as default.
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A program may be made portable to all locales by calling
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.B setlocale(LC_ALL, """""")
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after program initialization, by using the values returned
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from a
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.B localeconv()
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call
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for locale \- dependent information, by using the multi-byte and wide
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character functions for text processing if
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.BR "MB_CUR_MAX > 1" ,
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and by using
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.BR strcoll() ", " wcscoll()
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or
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.BR strxfrm() ", " wcsxfrm()
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to compare strings.
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.SH "RETURN VALUE"
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A successful call to
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.B setlocale()
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returns an opaque string that corresponds to the locale set.
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This string may be allocated in static storage.
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The string returned is such that a subsequent call with that string
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and its associated category will restore that part of the process's
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locale. The return value is
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.B NULL
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if the request cannot be honored.
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.SH "CONFORMING TO"
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ANSI C, POSIX.1
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.SH NOTES
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Linux (that is, GNU libc) supports the portable locales
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.BR """C""" " and " """POSIX""" .
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In the good old days there used to be support for
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the European Latin-1
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.B """ISO-8859-1"""
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locale (e.g. in libc-4.5.21 and libc-4.6.27), and the Russian
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.B """KOI-8"""
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(more precisely, "koi-8r") locale (e.g. in libc-4.6.27),
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so that having an environment variable LC_CTYPE=ISO-8859-1
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sufficed to make isprint() return the right answer.
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These days non-English speaking Europeans have to work a bit harder,
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and must install actual locale files.
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.SH "SEE ALSO"
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.BR locale (1),
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.BR localedef (1),
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.BR isalpha (3),
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.BR localeconv (3),
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.BR strcoll (3),
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.BR strftime (3),
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.BR charsets (4),
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.BR locale (7)
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