NEWLOCALE(3)               Linux Programmer's Manual              NEWLOCALE(3)

       newlocale, freelocale - create, modify, and free a locale object

       #include <locale.h>

       locale_t newlocale(int category_mask, const char *locale,
                          locale_t base);

       void freelocale(locale_t locobj);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       newlocale(), freelocale():
           Since glibc 2.10:
                  _XOPEN_SOURCE >= 700
           Before glibc 2.10:

       The  newlocale()  function  creates a new locale object, or modifies an
       existing object, returning a reference to the new or modified object as
       the function result.  Whether the call creates a new object or modifies
       an existing object is determined by the value of base:

       *  If base is (locale_t) 0, a new object is created.

       *  If base refers to valid existing locale object (i.e., an object  re-
          turned by a previous call to newlocale() or duplocale(3)), then that
          object is modified by the call.  If the call is successful, the con-
          tents of base are unspecified (in particular, the object referred to
          by base may be freed, and a new  object  created).   Therefore,  the
          caller  should  ensure  that  it stops using base before the call to
          newlocale(), and should subsequently refer to  the  modified  object
          via  the  reference  returned  as  the function result.  If the call
          fails, the contents of base remain valid and unchanged.

       If base is the  special  locale  object  LC_GLOBAL_LOCALE  (see  duplo-
       cale(3)),  or is not (locale_t) 0 and is not a valid locale object han-
       dle, the behavior is undefined.

       The category_mask argument is a bit mask that specifies the locale cat-
       egories that are to be set in a newly created locale object or modified
       in an existing object.  The mask is constructed by a bitwise OR of  the
       LC_TIME_MASK.  Alternatively, the mask can be specified as LC_ALL_MASK,
       which is equivalent to ORing all of the preceding constants.

       For  each category specified in category_mask, the locale data from lo-
       cale will be used in the object returned by newlocale().  If a new  lo-
       cale  object is being created, data for all categories not specified in
       category_mask is taken from the default ("POSIX") locale.

       The following preset values of locale are defined  for  all  categories
       that can be specified in category_mask:

              A minimal locale environment for C language programs.

       "C"    Equivalent to "POSIX".

       ""     An  implementation-defined  native  environment corresponding to
              the values of the LC_* and LANG environment variables  (see  lo-

       The freelocale() function deallocates the resources associated with lo-
       cobj, a locale object previously returned by a call to  newlocale()  or
       duplocale(3).  If locobj is LC_GLOBAL_LOCALE or is not valid locale ob-
       ject handle, the results are undefined.

       Once a locale object has been freed, the program should make no further
       use of it.

       On  success,  newlocale() returns a handle that can be used in calls to
       duplocale(3), freelocale(), and other functions that  take  a  locale_t
       argument.   On  error, newlocale() returns (locale_t) 0, and sets errno
       to indicate the cause of the error.

       EINVAL One or more bits in category_mask do not correspond to  a  valid
              locale category.

       EINVAL locale is NULL.

       ENOENT locale is not a string pointer referring to a valid locale.

       ENOMEM Insufficient memory to create a locale object.

       The  newlocale()  and  freelocale() functions first appeared in version
       2.3 of the GNU C library.


       Each locale object created by newlocale() should be  deallocated  using

       The  program  below  takes up to two command-line arguments, which each
       identify locales.  The first argument is required, and is used  to  set
       the  LC_NUMERIC  category in a locale object created using newlocale().
       The second command-line argument is optional; if it is present,  it  is
       used to set the LC_TIME category of the locale object.

       Having  created and initialized the locale object, the program then ap-
       plies it using uselocale(3), and then tests the effect  of  the  locale
       changes by:

       1. Displaying  a  floating-point  number  with a fractional part.  This
          output will be affected by the LC_NUMERIC setting.   In  many  Euro-
          pean-language  locales,  the  fractional part of the number is sepa-
          rated from the integer part using a comma, rather than a period.

       2. Displaying the date.  The format and language of the output will  be
          affected by the LC_TIME setting.

       The following shell sessions show some example runs of this program.

       Set the LC_NUMERIC category to fr_FR (French):

           $ ./a.out fr_FR
           Fri Mar  7 00:25:08 2014

       Set the LC_NUMERIC category to fr_FR (French), and the LC_TIME category
       to it_IT (Italian):

           $ ./a.out fr_FR it_IT
           ven 07 mar 2014 00:26:01 CET

       Specify the LC_TIME setting as an empty string, which causes the  value
       to  be  taken  from environment variable settings (which, here, specify
       mi_NZ, New Zealand Mori):

           $ LC_ALL=mi_NZ ./a.out fr_FR ""
           Te Paraire, te 07 o Pout-te-rangi, 2014 00:38:44 CET

   Program source
       #define _XOPEN_SOURCE 700
       #include <stdio.h>
       #include <stdlib.h>
       #include <locale.h>
       #include <time.h>

       #define errExit(msg)    do { perror(msg); exit(EXIT_FAILURE); \
                               } while (0)

       main(int argc, char *argv[])
           char buf[100];
           time_t t;
           size_t s;
           struct tm *tm;
           locale_t loc, nloc;

           if (argc < 2) {
               fprintf(stderr, "Usage: %s locale1 [locale2]\n", argv[0]);

           /* Create a new locale object, taking the LC_NUMERIC settings
              from the locale specified in argv[1] */

           loc = newlocale(LC_NUMERIC_MASK, argv[1], (locale_t) 0);
           if (loc == (locale_t) 0)

           /* If a second command-line argument was specified, modify the
              locale object to take the LC_TIME settings from the locale
              specified in argv[2]. We assign the result of this newlocale()
              call to 'nloc' rather than 'loc', since in some cases, we might
              want to preserve 'loc' if this call fails. */

           if (argc > 2) {
               nloc = newlocale(LC_TIME_MASK, argv[2], loc);
               if (nloc == (locale_t) 0)
               loc = nloc;

           /* Apply the newly created locale to this thread */


           /* Test effect of LC_NUMERIC */

           printf("%8.3f\n", 123456.789);

           /* Test effect of LC_TIME */

           t = time(NULL);
           tm = localtime(&t);
           if (tm == NULL)

           s = strftime(buf, sizeof(buf), "%c", tm);
           if (s == 0)

           printf("%s\n", buf);

           /* Free the locale object */



       locale(1), duplocale(3),  setlocale(3),  uselocale(3),  locale(5),  lo-

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       description of the project, information about reporting bugs,  and  the
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Linux                             2019-03-06                      NEWLOCALE(3)
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