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locale_fallback(3c)
Standard C Library Functions locale_fallback(3C)
NAME
locale_fallback - list of locale name fallback locales
SYNOPSIS
#include <locale.h>
char** locale_fallback(const char *locale,
int (*check)(const char *loc,
const char *lang,
const char *terr,
const char *cset,
const char *mod,
int type,
void *data),
void* data);
DESCRIPTION
The locale_fallback() function returns list of possible fallback
locales based on the *locale* locale name. If *locale* is NULL, current
locale of the program is used.
The *check* argument is the name of the validation function, which is
called with arguments that describe a possible fallback locale name. If
the function returns 0, the name is not included in return list. If the
function returns -1, the locale_fallback() function finishes immedi‐
ately and returns NULL. If *check* is NULL, then all possible fallback
locales are in the return list.
The *data* is passed to the check() function.
If the value of *type* is LCF_CANNONICAL_LOCALE, it means the locale
name is a canonical locale.
If the value of *type* is LCF_ALIAS_LOCALE, it means the locale name is
a locale alias.
If the value of *type* is LCF_OBSOLETE_LOCALE, it means the locale name
is an obsolete locale name.
RETURN VALUES
Upon successful completion, the locale_fallback() function returns NULL
terminated list of possible fallback locales. The list contains unique
values in descending order by priority, which explains that, the first
item is the most similar fallback locale. It returns NULL and sets
errno to indicate the error, or the check() function is provided and
the function returns -1 on some locale.
The list items and the list itself needs to be deallocated by using the
free() function.
ERRORS
The locale_fallback() function will fail if:
ENOMEM Cannot allocate memory
EXAMPLES
Example 1 Print program's current locale, fallback locales
char **list = locale_fallback(NULL, NULL, NULL);
if (list != NULL) {
int i;
for (i = 0; list[i] != NULL; i++) {
printf("Fallback locale: %s\n", list[i]);
free(list[i]);
}
free(list);
}
Or, the same with check function
int printit(const char *loc, const char *lang, const char *terr,
const char *cset, const char *mod, int type, void *data)
{
printf("Fallback locale: %s\n", loc);
return (0);
}
...
char **empty_list;
empty_list = locale_fallback(NULL, printit, NULL);
/* assert(empty_list[0] == NULL); */
free(empty_list);
Example 2 Get territory of program's current locale
int get_terr(const char *loc, const char *lang, const char *terr,
const char *cset, const char *mod, int type, void *data)
{
if (type == 1 && (*data = strdup(terr)) == NULL)
return -1;
return (0);
}
...
char **empty_list;
char *terr = NULL;
empty_list = locale_fallback(NULL, get_terr, &terr);
if (empty_list != NULL and terr != NULL)
printf("Current territory is %s\n", terr);
free(terr);
free(empty_list);
Example 3 Get list of fallback locales of message object 'myprg.mo'
with current gettext fallback rules
int checkfn(const char *loc, const char *lang, const char *terr, const char *cset, const char *mod, int type, void *data)
{
char *fn;
struct stat st;
int ret;
/*
* locale fallback in gettext only tries to use
* language_territory
* language
* LANGUAGE_TERRITORY
* LANGUAGE
*/
if (cset != NULL || mod != NULL || type == 3)
return 0;
/* check if file /usr/share/locale/%s/LC_MESSAGES/myprg.mo exists */
if (asprintf(&fn, data, loc) < 0)
return -1;
ret = stat(fn, &st);
free(fn);
return ret == 0 ? 1 : 0;
}
...
char **list;
int i;
/* get the list of locale fallbacks */
list = locale_fallback(NULL, checkfn, "/usr/share/locale/%s/LC_MESSAGES/myprg.mo");
if (list != NULL) {
... process list ...
/* deallocate the list */
for (i = 0; list[i]; i++)
free(list[i]);
free(list);
}
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ CSIEnabled _ Interface StabilityUncommitted _ MT-Lev‐
elMT-Safe
Oracle Solaris 11.4 14 Apr 2016 locale_fallback(3C)