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Man Pages
SETLOCALE(3) FreeBSD Library Functions Manual SETLOCALE(3)

setlocale
natural language formatting for C

Standard C Library (libc, -lc)

#include <locale.h>
char *
setlocale(int category, const char *locale);

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:
Set the entire locale generically.
Set a locale for string collation routines. This controls alphabetic ordering in strcoll() and strxfrm().
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.
Set a locale for message catalogs, see catopen(3) function.
Set a locale for formatting monetary values; this affects the localeconv() function.
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().
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.

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.

$PATH_LOCALE/locale/category
 
/usr/share/locale/locale/category
locale file for the locale locale and the category category.

No errors are defined.

colldef(1), mklocale(1), catopen(3), ctype(3), localeconv(3), multibyte(3), strcoll(3), strxfrm(3), euc(5), utf8(5), environ(7)

The setlocale() function conforms to ISO/IEC 9899:1999 (“ISO C99”).

The setlocale() function first appeared in 4.4BSD.
November 21, 2003 FreeBSD 12.0-RELEASE

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