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RedHat 9 (Linux i386) - man page for locale (redhat section 7)

LOCALE(7)			    Linux Programmer's Manual				LOCALE(7)

NAME
       locale - Description of multi-language support

SYNOPSIS
       #include <locale.h>

DESCRIPTION
       A  locale  is  a set of language and cultural rules.  These cover aspects such as language
       for messages, different character sets, lexigraphic conventions, etc.  A program needs  to
       be able to determine its locale and act accordingly to be portable to different cultures.

       The  header  <locale.h> declares data types, functions and macros which are useful in this
       task.

       The functions it declares are setlocale() to set the current locale, and  localeconv()  to
       get information about number formatting.

       There  are  different  categories  for  local  information  a program might need; they are
       declared as macros.  Using them as the first argument to the setlocale() function,  it  is
       possible to set one of these to the desired locale:

       LC_COLLATE
	      This  is	used  to  change  the behaviour of the functions strcoll() and strxfrm(),
	      which are used to compare strings in the local alphabet.	For example,  the  German
	      sharp s is sorted as "ss".

       LC_CTYPE
	      This  changes the behaviour of the character handling and classification functions,
	      such as isupper() and toupper(), and the multi-byte  character  functions  such  as
	      mblen() or wctomb().

       LC_MONETARY
	      changes  the  information  returned by localeconv() which describes the way numbers
	      are usually printed, with details such as decimal point versus decimal comma.  This
	      information is internally used by the function strfmon().

       LC_MESSAGES
	      changes  the  language messages are displayed in and how an affirmative or negative
	      answer looks like.  The GNU  C-library  contains	the  gettext(),  ngettext(),  and
	      rpmatch()  functions  to ease the use of these information.  The GNU gettext family
	      of functions also obey the environment variable LANGUAGE.

       LC_NUMERIC
	      changes the information used by the printf() and scanf() family of functions,  when
	      they  are  advised  to  use the locale-settings.	This information can also be read
	      with the localeconv() function.

       LC_TIME
	      changes the behaviour of the strftime() function to display the current time  in	a
	      locally  acceptable  form; for example, most of Europe uses a 24-hour clock vs. the
	      US' 12-hour clock.

       LC_ALL All of the above.

       If the second argument to setlocale() is empty string, "", for the default locale,  it  is
       determined using the following steps:

       1.     If there is a non-null environment variable LC_ALL, the value of LC_ALL is used.

       2.     If an environment variable with the same name as one of the categories above exists
	      and is non-null, its value is used for that category.

       3.     If there is a non-null environment variable LANG, the value of LANG is used.

       Values about local numeric formatting is made available in a struct lconv returned by  the
       localeconv() function, which has the following declaration:
       struct lconv
       {
	 /* Numeric (non-monetary) information.  */

	 char *decimal_point;	     /* Decimal point character.  */
	 char *thousands_sep;	     /* Thousands separator.  */
	 /* Each element is the number of digits in each group;
	    elements with higher indices are farther left.
	    An element with value CHAR_MAX means that no further grouping is done.
	    An element with value 0 means that the previous element is used
	    for all groups farther left.  */
	 char *grouping;

	 /* Monetary information.  */

	 /* First three chars are a currency symbol from ISO 4217.
	    Fourth char is the separator.  Fifth char is ' '.  */
	 char *int_curr_symbol;
	 char *currency_symbol; /* Local currency symbol.  */
	 char *mon_decimal_point;    /* Decimal point character.  */
	 char *mon_thousands_sep;    /* Thousands separator.  */
	 char *mon_grouping;	     /* Like `grouping' element (above).  */
	 char *positive_sign;	     /* Sign for positive values.  */
	 char *negative_sign;	     /* Sign for negative values.  */
	 char int_frac_digits;	     /* Int'l fractional digits.  */
	 char frac_digits;	/* Local fractional digits.  */
	 /* 1 if currency_symbol precedes a positive value, 0 if succeeds.  */
	 char p_cs_precedes;
	 /* 1 if a space separates currency_symbol from a positive value.  */
	 char p_sep_by_space;
	 /* 1 if currency_symbol precedes a negative value, 0 if succeeds.  */
	 char n_cs_precedes;
	 /* 1 if a space separates currency_symbol from a negative value.  */
	 char n_sep_by_space;
	 /* Positive and negative sign positions:
	    0 Parentheses surround the quantity and currency_symbol.
	    1 The sign string precedes the quantity and currency_symbol.
	    2 The sign string succeeds the quantity and currency_symbol.
	    3 The sign string immediately precedes the currency_symbol.
	    4 The sign string immediately succeeds the currency_symbol.  */
	 char p_sign_posn;
	 char n_sign_posn;
       };

CONFORMS TO
       POSIX.1
       The GNU gettext functions are specified in LI18NUX2000.

SEE ALSO
       setlocale(3),  localeconv(3),  locale(1),  localedef(1), nl_langinfo(3), gettext(3), nget-
       text(3), rpmatch(3), strfmon(3), strcoll(3), strxfrm(3), strftime(3)

Linux					    1993-04-24					LOCALE(7)


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