Mac Developer Library Developer


This manual page is part of Xcode Tools version 5.0

To obtain these tools:

If you are running a version of Xcode Tools other than 5.0, view the documentation locally:

  • In Xcode

  • In Terminal, using the man(1) command

Reading manual pages

Manual pages are intended as a quick reference for people who already understand a technology.

  • To learn how the manual is organized or to learn about command syntax, read the manual page for manpages(5).

  • For more information about this technology, look for other documentation in the Apple Developer Library.

  • For general information about writing shell scripts, read Shell Scripting Primer.

SETLOCALE(3)             BSD 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 particu-lar particular
     lar 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:

     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.

     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.

     /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.

BSD                            November 21, 2003                           BSD

Reporting Problems

The way to report a problem with this manual page depends on the type of problem:

Content errors
Report errors in the content of this documentation with the feedback links below.
Bug reports
Report bugs in the functionality of the described tool or API through Bug Reporter.
Formatting problems
Report formatting mistakes in the online version of these pages with the feedback links below.