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setlocale(3) [osx man page]

SETLOCALE(3)						   BSD Library Functions Manual 					      SETLOCALE(3)

setlocale -- natural language formatting for C LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <locale.h> char * setlocale(int category, const char *locale); DESCRIPTION
The setlocale() function sets the C library's notion of natural language formatting style for particular sets of routines. Each such style is called a 'locale' and is invoked using an appropriate name passed as a C string. The setlocale() function recognizes several categories of routines. These are the categories and the sets of routines they select: LC_ALL Set the entire locale generically. LC_COLLATE Set a locale for string collation routines. This controls alphabetic ordering in strcoll() and strxfrm(). LC_CTYPE Set a locale for the ctype(3) and multibyte(3) functions. This controls recognition of upper and lower case, alphabetic or non- alphabetic characters, and so on. LC_MESSAGES Set a locale for message catalogs, see catopen(3) function. LC_MONETARY Set a locale for formatting monetary values; this affects the localeconv() function. LC_NUMERIC Set a locale for formatting numbers. This controls the formatting of decimal points in input and output of floating point num- bers in functions such as printf() and scanf(), as well as values returned by localeconv(). LC_TIME Set a locale for formatting dates and times using the strftime() function. Only three locales are defined by default: the empty string "" (which denotes the native environment) and the "C" and "POSIX" locales (which denote the C-language environment). A locale argument of NULL causes setlocale() to return the current locale. By default, C programs start in the "C" locale. The only function in the library that sets the locale is setlocale(); the locale is never changed as a side effect of some other routine. RETURN VALUES
Upon successful completion, setlocale() returns the string associated with the specified category for the requested locale. The setlocale() function returns NULL and fails to change the locale if the given combination of category and locale makes no sense. FILES
$PATH_LOCALE/locale/category /usr/share/locale/locale/category locale file for the locale locale and the category category. ERRORS
No errors are defined. SEE ALSO
colldef(1), mklocale(1), catopen(3), ctype(3), localeconv(3), multibyte(3), strcoll(3), strxfrm(3), euc(5), utf8(5), environ(7) STANDARDS
The setlocale() function conforms to ISO/IEC 9899:1999 (``ISO C99''). HISTORY
The setlocale() function first appeared in 4.4BSD. BSD
November 21, 2003 BSD

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SETLOCALE(3)						     Linux Programmer's Manual						      SETLOCALE(3)

setlocale - set the current locale. SYNOPSIS
#include <locale.h> char *setlocale(int category, const char *locale); DESCRIPTION
The setlocale() function is used to set or query the program's current locale. If locale is not NULL, the program's current locale is modified according to the arguments. The argument category determines which parts of the program's current locale should be modified. LC_ALL for all of the locale. LC_COLLATE for regular expression matching (it determines the meaning of range expressions and equivalence classes) and string collation. LC_CTYPE for regular expression matching, character classification, conversion, case-sensitive comparison, and wide character functions. LC_MESSAGES for localizable natural-language messages. LC_MONETARY for monetary formatting. LC_NUMERIC for number formatting (such as the decimal point and the thousands separator). LC_TIME for time and date formatting. The argument locale is a pointer to a character string containing the required setting of category. Such a string is either a well-known constant like "C" or "da_DK" (see below), or an opaque string that was returned by another call of setlocale. If locale is "", each part of the locale that should be modified is set according to the environment variables. The details are implementa- tion dependent. For glibc, first (regardless of category), the environment variable LC_ALL is inspected, next the environment variable with the same name as the category (LC_COLLATE, LC_CTYPE, LC_MESSAGES, LC_MONETARY, LC_NUMERIC, LC_TIME) and finally the environment vari- able LANG. The first existing environment variable is used. If its value is not a valid locale specification, the locale is unchanged, and setlocale returns NULL. The locale "C" or "POSIX" is a portable locale; its LC_CTYPE part corresponds to the 7-bit ASCII character set. A locale name is typically of the form language[_territory][.codeset][@modifier], where language is an ISO 639 language code, territory is an ISO 3166 country code, and codeset is a character set or encoding identifier like ISO-8859-1 or UTF-8. For a list of all supported locales, try "locale -a", cf. locale(1). If locale is NULL, the current locale is only queried, not modified. On startup of the main program, the portable "C" locale is selected as default. A program may be made portable to all locales by calling setlocale(LC_ALL, "" ) after program initialization, by using the values returned from a localeconv() call for locale - dependent informa- tion, by using the multi-byte and wide character functions for text processing if MB_CUR_MAX > 1, and by using strcoll(), wcscoll() or strxfrm(), wcsxfrm() to compare strings. RETURN VALUE
A successful call to setlocale() returns an opaque string that corresponds to the locale set. This string may be allocated in static stor- age. The string returned is such that a subsequent call with that string and its associated category will restore that part of the process's locale. The return value is NULL if the request cannot be honored. CONFORMING TO
Linux (that is, GNU libc) supports the portable locales "C" and "POSIX". In the good old days there used to be support for the European Latin-1 "ISO-8859-1" locale (e.g. in libc-4.5.21 and libc-4.6.27), and the Russian "KOI-8" (more precisely, "koi-8r") locale (e.g. in libc-4.6.27), so that having an environment variable LC_CTYPE=ISO-8859-1 sufficed to make isprint() return the right answer. These days non-English speaking Europeans have to work a bit harder, and must install actual locale files. SEE ALSO
locale(1), localedef(1), strcoll(3), isalpha(3), localeconv(3), strftime(3), charsets(4), locale(7), nl_langinfo(3) GNU
1999-07-04 SETLOCALE(3)
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