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DESCRIPTION

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 numbers 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.