setlocale() - set or query the program's locale
#include <locale.h>
char * setlocale(int category, const char *locale)
The setlocale(3) function changes or queries the program's locale. The category is used to specify part of the locale. It can have any one of these values (defined in <locale.h>):
| LC_ALL | The entire locale |
| LC_COLLATE | Character collating sequence |
| LC_CTYPE | Character handling and multibyte functions |
| LC_MONETARY | Monetary formatting information |
| LC_NUMERIC | Decimal point character in I/O and string conversions |
| LC_TIME | Time formatting -- see strftime() |
The locale argument is a string naming a particular locale. All POSIX-conforming systems support the locales "C" and "POSIX". Up to and including release 2.0, INTERIX supports only the C and POSIX locales.
To query the current locale, use a null string ("") as the locale. setlocale(3) returns the name of the current locale for that category.
The return value may be overwritten by a subsequent call to setlocale(3), so your program shouldn't modify it.
On success, the setlocale(3) function returns a string that corresponds to the locale specified by locale. If the function fails, it returns NULL.
isalnum(3)
isalpha(3)
iscntrl(3)
isgraph(3)
islower(3)
isprint(3)
ispunct(3)
isspace(3)
isupper(3)
localeconv(3)
strcoll(3)
strftime(3)
strxfrm(3)