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

       locale - description of multilanguage support

       #include <locale.h>

       A  locale is a set of language and cultural rules.  These cover aspects
       such as language for messages, different character sets,	 lexicographic
       conventions,  and  so  on.  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(3) to set the current locale,
       and localeconv(3) 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(3) function, it is possible to set one of	these  to  the
       desired locale:

	      This  is used to change the behavior of the functions strcoll(3)
	      and strxfrm(3), which are used to compare strings in  the	 local
	      alphabet.	 For example, the German sharp s is sorted as "ss".

	      This  changes the behavior of the character handling and classi‐
	      fication functions, such as isupper(3) and toupper(3),  and  the
	      multibyte character functions such as mblen(3) or wctomb(3).

	      changes	the   information   returned  by  localeconv(3)	 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(3).

	      changes the language messages  are  displayed  in	 and  what  an
	      affirmative  or  negative	 answer looks like.  The GNU C-library
	      contains the gettext(3), ngettext(3), and	 rpmatch(3)  functions
	      to ease the use of these information.  The GNU gettext family of
	      functions also obey the environment variable LANGUAGE  (contain‐
	      ing a colon-separated list of locales) if the category is set to
	      a valid locale other than "C".

	      changes the information used by the printf(3) and scanf(3)  fam‐
	      ily  of  functions, when they are advised to use the locale-set‐
	      tings.  This information can also be read with the localeconv(3)

	      changes  the behavior of the strftime(3) function to display the
	      current time in a locally acceptable form; for example, most  of
	      Europe uses a 24-hour clock versus the 12-hour clock used in the
	      United States.

       LC_ALL All of the above.

       If the second argument to setlocale(3) 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 cat‐
	      egories above exists and is non-null, its value is used for that

       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(3) function, which has	the  following

	 struct lconv {

	     /* Numeric (nonmonetary) information */

	     char *decimal_point;     /* Radix character */
	     char *thousands_sep;     /* Separator for digit groups to left
					 of radix character */
	     char *grouping; /* Each element is the number of digits in a
				group; elements with higher indices are
				further 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 further left. */

	     /* Remaining fields are for monetary information */

	     char *int_curr_symbol;   /* First three chars are a currency symbol
					 from ISO 4217.	 Fourth char is the
					 separator.  Fifth char is '\0'. */
	     char *currency_symbol;   /* Local currency symbol */
	     char *mon_decimal_point; /* Radix character */
	     char *mon_thousands_sep; /* Like thousands_sep above */
	     char *mon_grouping;      /* Like grouping above */
	     char *positive_sign;     /* Sign for positive values */
	     char *negative_sign;     /* Sign for negative values */
	     char  int_frac_digits;   /* International fractional digits */
	     char  frac_digits;	      /* Local fractional digits */
	     char  p_cs_precedes;     /* 1 if currency_symbol precedes a
					 positive value, 0 if succeeds */
	     char  p_sep_by_space;    /* 1 if a space separates currency_symbol
					 from a positive value */
	     char  n_cs_precedes;     /* 1 if currency_symbol precedes a
					 negative value, 0 if succeeds */
	     char  n_sep_by_space;    /* 1 if a space separates currency_symbol
					 from a negative value */
	     /* 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;


       The GNU gettext functions are specified in LI18NUX2000.

       locale(1),   localedef(1),   gettext(3),	  localeconv(3),  ngettext(3),
       nl_langinfo(3), rpmatch(3), setlocale(3), strcoll(3), strfmon(3), strf‐
       time(3), strxfrm(3)

       This  page  is  part of release 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux				  2008-12-05			     LOCALE(7)

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