перевести сообщение (translate message)
Имя (Name)
gettext, dgettext, dcgettext - translate message
Синопсис (Synopsis)
#include <libintl.h>
char * gettext (const char * msgid);
char * dgettext (const char * domainname, const char * msgid);
char * dcgettext (const char * domainname, const char * msgid,
int category);
Описание (Description)
The gettext, dgettext and dcgettext functions attempt to
translate a text string into the user's native language, by
looking up the translation in a message catalog.
The msgid argument identifies the message to be translated. By
convention, it is the English version of the message, with non-
ASCII characters replaced by ASCII approximations. This choice
allows the translators to work with message catalogs, called PO
files, that contain both the English and the translated versions
of each message, and can be installed using the msgfmt utility.
A message domain is a set of translatable msgid messages.
Usually, every software package has its own message domain. The
domain name is used to determine the message catalog where the
translation is looked up; it must be a non-empty string. For the
gettext function, it is specified through a preceding textdomain
call. For the dgettext and dcgettext functions, it is passed as
the domainname argument; if this argument is NULL, the domain
name specified through a preceding textdomain call is used
instead.
Translation lookup operates in the context of the current locale.
For the gettext and dgettext functions, the LC_MESSAGES locale
facet is used. It is determined by a preceding call to the
setlocale function. setlocale(LC_ALL,"") initializes the
LC_MESSAGES locale based on the first nonempty value of the three
environment variables LC_ALL, LC_MESSAGES, LANG; see
setlocale(3). For the dcgettext function, the locale facet is
determined by the category argument, which should be one of the
LC_xxx constants defined in the <locale.h> header, excluding
LC_ALL. In both cases, the functions also use the LC_CTYPE locale
facet in order to convert the translated message from the
translator's codeset to the current locale's codeset, unless
overridden by a prior call to the bind_textdomain_codeset
function.
The message catalog used by the functions is at the pathname
dirname/locale/category/domainname.mo. Here dirname is the
directory specified through bindtextdomain. Its default is system
and configuration dependent; typically it is prefix/share/locale,
where prefix is the installation prefix of the package. locale is
the name of the current locale facet; the GNU implementation also
tries generalizations, such as the language name without the
territory name. category is LC_MESSAGES for the gettext and
dgettext functions, or the argument passed to the dcgettext
function.
If the LANGUAGE environment variable is set to a nonempty value,
and the locale is not the "C" locale, the value of LANGUAGE is
assumed to contain a colon separated list of locale names. The
functions will attempt to look up a translation of msgid in each
of the locales in turn. This is a GNU extension.
In the "C" locale, or if none of the used catalogs contain a
translation for msgid, the gettext, dgettext and dcgettext
functions return msgid.
Возвращаемое значение (Return value)
If a translation was found in one of the specified catalogs, it
is converted to the locale's codeset and returned. The resulting
string is statically allocated and must not be modified or freed.
Otherwise msgid is returned.
Ошибки (Error)
errno is not modified.
Ошибки (баги) (Bugs)
The return type ought to be const char *, but is char * to avoid
warnings in C code predating ANSI C.
When an empty string is used for msgid, the functions may return
a nonempty string.
Смотри также (See also)
ngettext(3), dngettext(3), dcngettext(3), setlocale(3),
textdomain(3), bindtextdomain(3), bind_textdomain_codeset(3),
msgfmt(1)
