emacs/lib/gettext.h

/* Convenience header for conditional use of GNU <libintl.h>.
   Copyright (C) 1995-1998, 2000-2002, 2004-2006, 2009-2017 Free
   Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with this program; if not, see <http://www.gnu.org/licenses/>.  */

#ifndef _LIBGETTEXT_H
#define _LIBGETTEXT_H 1

/* NLS can be disabled through the configure --disable-nls option.  */
#if ENABLE_NLS

/* Get declarations of GNU message catalog functions.  */
# include <libintl.h>

/* You can set the DEFAULT_TEXT_DOMAIN macro to specify the domain used by
   the gettext() and ngettext() macros.  This is an alternative to calling
   textdomain(), and is useful for libraries.  */
# ifdef DEFAULT_TEXT_DOMAIN
#  undef gettext
#  define gettext(Msgid) \
     dgettext (DEFAULT_TEXT_DOMAIN, Msgid)
#  undef ngettext
#  define ngettext(Msgid1, Msgid2, N) \
     dngettext (DEFAULT_TEXT_DOMAIN, Msgid1, Msgid2, N)
# endif

#else

/* Solaris /usr/include/locale.h includes /usr/include/libintl.h, which
   chokes if dcgettext is defined as a macro.  So include it now, to make
   later inclusions of <locale.h> a NOP.  We don't include <libintl.h>
   as well because people using "gettext.h" will not include <libintl.h>,
   and also including <libintl.h> would fail on SunOS 4, whereas <locale.h>
   is OK.  */
#if defined(__sun)
# include <locale.h>
#endif

/* Many header files from the libstdc++ coming with g++ 3.3 or newer include
   <libintl.h>, which chokes if dcgettext is defined as a macro.  So include
   it now, to make later inclusions of <libintl.h> a NOP.  */
#if defined(__cplusplus) && defined(__GNUG__) && (__GNUC__ >= 3)
# include <cstdlib>
# if (__GLIBC__ >= 2 && !defined __UCLIBC__) || _GLIBCXX_HAVE_LIBINTL_H
#  include <libintl.h>
# endif
#endif

/* Disabled NLS.
   The casts to 'const char *' serve the purpose of producing warnings
   for invalid uses of the value returned from these functions.
   On pre-ANSI systems without 'const', the config.h file is supposed to
   contain "#define const".  */
# undef gettext
# define gettext(Msgid) ((const char *) (Msgid))
# undef dgettext
# define dgettext(Domainname, Msgid) ((void) (Domainname), gettext (Msgid))
# undef dcgettext
# define dcgettext(Domainname, Msgid, Category) \
    ((void) (Category), dgettext (Domainname, Msgid))
# undef ngettext
# define ngettext(Msgid1, Msgid2, N) \
    ((N) == 1 \
     ? ((void) (Msgid2), (const char *) (Msgid1)) \
     : ((void) (Msgid1), (const char *) (Msgid2)))
# undef dngettext
# define dngettext(Domainname, Msgid1, Msgid2, N) \
    ((void) (Domainname), ngettext (Msgid1, Msgid2, N))
# undef dcngettext
# define dcngettext(Domainname, Msgid1, Msgid2, N, Category) \
    ((void) (Category), dngettext (Domainname, Msgid1, Msgid2, N))
# undef textdomain
# define textdomain(Domainname) ((const char *) (Domainname))
# undef bindtextdomain
# define bindtextdomain(Domainname, Dirname) \
    ((void) (Domainname), (const char *) (Dirname))
# undef bind_textdomain_codeset
# define bind_textdomain_codeset(Domainname, Codeset) \
    ((void) (Domainname), (const char *) (Codeset))

#endif

/* Prefer gnulib's setlocale override over libintl's setlocale override.  */
#ifdef GNULIB_defined_setlocale
# undef setlocale
# define setlocale rpl_setlocale
#endif

/* A pseudo function call that serves as a marker for the automated
   extraction of messages, but does not call gettext().  The run-time
   translation is done at a different place in the code.
   The argument, String, should be a literal string.  Concatenated strings
   and other string expressions won't work.
   The macro's expansion is not parenthesized, so that it is suitable as
   initializer for static 'char[]' or 'const char[]' variables.  */
#define gettext_noop(String) String

/* The separator between msgctxt and msgid in a .mo file.  */
#define GETTEXT_CONTEXT_GLUE "\004"

/* Pseudo function calls, taking a MSGCTXT and a MSGID instead of just a
   MSGID.  MSGCTXT and MSGID must be string literals.  MSGCTXT should be
   short and rarely need to change.
   The letter 'p' stands for 'particular' or 'special'.  */
#ifdef DEFAULT_TEXT_DOMAIN
# define pgettext(Msgctxt, Msgid) \
   pgettext_aux (DEFAULT_TEXT_DOMAIN, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, LC_MESSAGES)
#else
# define pgettext(Msgctxt, Msgid) \
   pgettext_aux (NULL, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, LC_MESSAGES)
#endif
#define dpgettext(Domainname, Msgctxt, Msgid) \
  pgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, LC_MESSAGES)
#define dcpgettext(Domainname, Msgctxt, Msgid, Category) \
  pgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, Category)
#ifdef DEFAULT_TEXT_DOMAIN
# define npgettext(Msgctxt, Msgid, MsgidPlural, N) \
   npgettext_aux (DEFAULT_TEXT_DOMAIN, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, LC_MESSAGES)
#else
# define npgettext(Msgctxt, Msgid, MsgidPlural, N) \
   npgettext_aux (NULL, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, LC_MESSAGES)
#endif
#define dnpgettext(Domainname, Msgctxt, Msgid, MsgidPlural, N) \
  npgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, LC_MESSAGES)
#define dcnpgettext(Domainname, Msgctxt, Msgid, MsgidPlural, N, Category) \
  npgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, Category)

#ifdef __GNUC__
__inline
#else
#ifdef __cplusplus
inline
#endif
#endif
static const char *
pgettext_aux (const char *domain,
              const char *msg_ctxt_id, const char *msgid,
              int category)
{
  const char *translation = dcgettext (domain, msg_ctxt_id, category);
  if (translation == msg_ctxt_id)
    return msgid;
  else
    return translation;
}

#ifdef __GNUC__
__inline
#else
#ifdef __cplusplus
inline
#endif
#endif
static const char *
npgettext_aux (const char *domain,
               const char *msg_ctxt_id, const char *msgid,
               const char *msgid_plural, unsigned long int n,
               int category)
{
  const char *translation =
    dcngettext (domain, msg_ctxt_id, msgid_plural, n, category);
  if (translation == msg_ctxt_id || translation == msgid_plural)
    return (n == 1 ? msgid : msgid_plural);
  else
    return translation;
}

/* The same thing extended for non-constant arguments.  Here MSGCTXT and MSGID
   can be arbitrary expressions.  But for string literals these macros are
   less efficient than those above.  */

#include <string.h>

#if (((__GNUC__ >= 3 || __GNUG__ >= 2) && !defined __STRICT_ANSI__) \
     /* || __STDC_VERSION__ >= 199901L */ )
# define _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS 1
#else
# define _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS 0
#endif

#if !_LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
#include <stdlib.h>
#endif

#define pgettext_expr(Msgctxt, Msgid) \
  dcpgettext_expr (NULL, Msgctxt, Msgid, LC_MESSAGES)
#define dpgettext_expr(Domainname, Msgctxt, Msgid) \
  dcpgettext_expr (Domainname, Msgctxt, Msgid, LC_MESSAGES)

#ifdef __GNUC__
__inline
#else
#ifdef __cplusplus
inline
#endif
#endif
static const char *
dcpgettext_expr (const char *domain,
                 const char *msgctxt, const char *msgid,
                 int category)
{
  size_t msgctxt_len = strlen (msgctxt) + 1;
  size_t msgid_len = strlen (msgid) + 1;
  const char *translation;
#if _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
  char msg_ctxt_id[msgctxt_len + msgid_len];
#else
  char buf[1024];
  char *msg_ctxt_id =
    (msgctxt_len + msgid_len <= sizeof (buf)
     ? buf
     : (char *) malloc (msgctxt_len + msgid_len));
  if (msg_ctxt_id != NULL)
#endif
    {
      int found_translation;
      memcpy (msg_ctxt_id, msgctxt, msgctxt_len - 1);
      msg_ctxt_id[msgctxt_len - 1] = '\004';
      memcpy (msg_ctxt_id + msgctxt_len, msgid, msgid_len);
      translation = dcgettext (domain, msg_ctxt_id, category);
      found_translation = (translation != msg_ctxt_id);
#if !_LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
      if (msg_ctxt_id != buf)
        free (msg_ctxt_id);
#endif
      if (found_translation)
        return translation;
    }
  return msgid;
}

#define npgettext_expr(Msgctxt, Msgid, MsgidPlural, N) \
  dcnpgettext_expr (NULL, Msgctxt, Msgid, MsgidPlural, N, LC_MESSAGES)
#define dnpgettext_expr(Domainname, Msgctxt, Msgid, MsgidPlural, N) \
  dcnpgettext_expr (Domainname, Msgctxt, Msgid, MsgidPlural, N, LC_MESSAGES)

#ifdef __GNUC__
__inline
#else
#ifdef __cplusplus
inline
#endif
#endif
static const char *
dcnpgettext_expr (const char *domain,
                  const char *msgctxt, const char *msgid,
                  const char *msgid_plural, unsigned long int n,
                  int category)
{
  size_t msgctxt_len = strlen (msgctxt) + 1;
  size_t msgid_len = strlen (msgid) + 1;
  const char *translation;
#if _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
  char msg_ctxt_id[msgctxt_len + msgid_len];
#else
  char buf[1024];
  char *msg_ctxt_id =
    (msgctxt_len + msgid_len <= sizeof (buf)
     ? buf
     : (char *) malloc (msgctxt_len + msgid_len));
  if (msg_ctxt_id != NULL)
#endif
    {
      int found_translation;
      memcpy (msg_ctxt_id, msgctxt, msgctxt_len - 1);
      msg_ctxt_id[msgctxt_len - 1] = '\004';
      memcpy (msg_ctxt_id + msgctxt_len, msgid, msgid_len);
      translation = dcngettext (domain, msg_ctxt_id, msgid_plural, n, category);
      found_translation = !(translation == msg_ctxt_id || translation == msgid_plural);
#if !_LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
      if (msg_ctxt_id != buf)
        free (msg_ctxt_id);
#endif
      if (found_translation)
        return translation;
    }
  return (n == 1 ? msgid : msgid_plural);
}

#endif /* _LIBGETTEXT_H */