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Document the internal _ and N_ macros

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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer 2020-05-06 17:35:21 +02:00
parent 898f379316
commit d69c3a9e75
1 changed files with 24 additions and 8 deletions
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32
include/libintl.h
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@ -37,17 +37,33 @@ extern char *__bind_textdomain_codeset (const char *__domainname,
extern const char _libc_intl_domainname[];
libc_hidden_proto (_libc_intl_domainname)
/* Define the macros `_' and `N_' for conveniently marking translatable
strings in the libc source code. We have to make sure we get the
correct definitions so we undefine the macros first. */
/* _ marks its argument, a string literal, for translation, and
performs translation at run time if the LC_MESSAGES locale category
has been set. The MSGID argument is extracted, added to the
translation database, and eventually submitted to the translation
team for processing. New translations are periodically
incorporated into the glibc source tree as part of translation
updates. */
# undef _
# define _(msgid) __dcgettext (_libc_intl_domainname, msgid, LC_MESSAGES)
/* N_ marks its argument, a string literal, for translation, so that
it is extracted and added to the translation database (similar to
the _ macro above). It does not translate the string at run time.
The first, primary use case for N_ is a context in which a string
literal is required, such as an initializer. Translation will
happen later, for example using the __gettext function.
The second, historic, use case involves strings which may be
translated in a future version of the library, but cannot be
translated in current releases due to some technical limitation
(e.g., gettext not being available in the dynamic loader). No
translation at run time happens in such cases. In the future, this
historic usage of N_ may become deprecated. Strings which are not
translated create unnecessary work for the translation team. We
continue to use N_ because it helps mark translatable strings. */
# undef N_
# define N_(msgid) msgid
# undef _
/* This is defined as an optimizing macro, so use it. */
# define _(msgid) \
__dcgettext (_libc_intl_domainname, msgid, LC_MESSAGES)
# endif /* !_ISOMAC */
#endif