src/gettext.h

   1 /* Convenience header for conditional use of GNU <libintl.h>.
   2    Copyright (C) 1995-1998, 2000-2002, 2004-2006, 2009-2011 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #ifndef _LIBGETTEXT_H
  18 #define _LIBGETTEXT_H 1
  19
  20 /* NLS can be disabled through the configure --disable-nls option.  */
  21 #if ENABLE_NLS
  22
  23 /* Get declarations of GNU message catalog functions.  */
  24 # include <libintl.h>
  25
  26 /* You can set the DEFAULT_TEXT_DOMAIN macro to specify the domain used by
  27    the gettext() and ngettext() macros.  This is an alternative to calling
  28    textdomain(), and is useful for libraries.  */
  29 # ifdef DEFAULT_TEXT_DOMAIN
  30 #  undef gettext
  31 #  define gettext(Msgid) \
  32      dgettext (DEFAULT_TEXT_DOMAIN, Msgid)
  33 #  undef ngettext
  34 #  define ngettext(Msgid1, Msgid2, N) \
  35      dngettext (DEFAULT_TEXT_DOMAIN, Msgid1, Msgid2, N)
  36 # endif
  37
  38 #else
  39
  40 /* Solaris /usr/include/locale.h includes /usr/include/libintl.h, which
  41    chokes if dcgettext is defined as a macro.  So include it now, to make
  42    later inclusions of <locale.h> a NOP.  We don't include <libintl.h>
  43    as well because people using "gettext.h" will not include <libintl.h>,
  44    and also including <libintl.h> would fail on SunOS 4, whereas <locale.h>
  45    is OK.  */
  46 #if defined(__sun)
  47 # include <locale.h>
  48 #endif
  49
  50 /* Many header files from the libstdc++ coming with g++ 3.3 or newer include
  51    <libintl.h>, which chokes if dcgettext is defined as a macro.  So include
  52    it now, to make later inclusions of <libintl.h> a NOP.  */
  53 #if defined(__cplusplus) && defined(__GNUG__) && (__GNUC__ >= 3)
  54 # include <cstdlib>
  55 # if (__GLIBC__ >= 2 && !defined __UCLIBC__) || _GLIBCXX_HAVE_LIBINTL_H
  56 #  include <libintl.h>
  57 # endif
  58 #endif
  59
  60 /* Disabled NLS.
  61    The casts to 'const char *' serve the purpose of producing warnings
  62    for invalid uses of the value returned from these functions.
  63    On pre-ANSI systems without 'const', the config.h file is supposed to
  64    contain "#define const".  */
  65 # undef gettext
  66 # define gettext(Msgid) ((const char *) (Msgid))
  67 # undef dgettext
  68 # define dgettext(Domainname, Msgid) ((void) (Domainname), gettext (Msgid))
  69 # undef dcgettext
  70 # define dcgettext(Domainname, Msgid, Category) \
  71     ((void) (Category), dgettext (Domainname, Msgid))
  72 # undef ngettext
  73 # define ngettext(Msgid1, Msgid2, N) \
  74     ((N) == 1 \
  75      ? ((void) (Msgid2), (const char *) (Msgid1)) \
  76      : ((void) (Msgid1), (const char *) (Msgid2)))
  77 # undef dngettext
  78 # define dngettext(Domainname, Msgid1, Msgid2, N) \
  79     ((void) (Domainname), ngettext (Msgid1, Msgid2, N))
  80 # undef dcngettext
  81 # define dcngettext(Domainname, Msgid1, Msgid2, N, Category) \
  82     ((void) (Category), dngettext (Domainname, Msgid1, Msgid2, N))
  83 # undef textdomain
  84 # define textdomain(Domainname) ((const char *) (Domainname))
  85 # undef bindtextdomain
  86 # define bindtextdomain(Domainname, Dirname) \
  87     ((void) (Domainname), (const char *) (Dirname))
  88 # undef bind_textdomain_codeset
  89 # define bind_textdomain_codeset(Domainname, Codeset) \
  90     ((void) (Domainname), (const char *) (Codeset))
  91
  92 #endif
  93
  94 /* Prefer gnulib's setlocale override over libintl's setlocale override.  */
  95 #ifdef GNULIB_defined_setlocale
  96 # undef setlocale
  97 # define setlocale rpl_setlocale
  98 #endif
  99
 100 /* A pseudo function call that serves as a marker for the automated
 101    extraction of messages, but does not call gettext().  The run-time
 102    translation is done at a different place in the code.
 103    The argument, String, should be a literal string.  Concatenated strings
 104    and other string expressions won't work.
 105    The macro's expansion is not parenthesized, so that it is suitable as
 106    initializer for static 'char[]' or 'const char[]' variables.  */
 107 #define gettext_noop(String) String
 108
 109 /* The separator between msgctxt and msgid in a .mo file.  */
 110 #define GETTEXT_CONTEXT_GLUE "\004"
 111
 112 /* Pseudo function calls, taking a MSGCTXT and a MSGID instead of just a
 113    MSGID.  MSGCTXT and MSGID must be string literals.  MSGCTXT should be
 114    short and rarely need to change.
 115    The letter 'p' stands for 'particular' or 'special'.  */
 116 #ifdef DEFAULT_TEXT_DOMAIN
 117 # define pgettext(Msgctxt, Msgid) \
 118    pgettext_aux (DEFAULT_TEXT_DOMAIN, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, LC_MESSAGES)
 119 #else
 120 # define pgettext(Msgctxt, Msgid) \
 121    pgettext_aux (NULL, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, LC_MESSAGES)
 122 #endif
 123 #define dpgettext(Domainname, Msgctxt, Msgid) \
 124   pgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, LC_MESSAGES)
 125 #define dcpgettext(Domainname, Msgctxt, Msgid, Category) \
 126   pgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, Category)
 127 #ifdef DEFAULT_TEXT_DOMAIN
 128 # define npgettext(Msgctxt, Msgid, MsgidPlural, N) \
 129    npgettext_aux (DEFAULT_TEXT_DOMAIN, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, LC_MESSAGES)
 130 #else
 131 # define npgettext(Msgctxt, Msgid, MsgidPlural, N) \
 132    npgettext_aux (NULL, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, LC_MESSAGES)
 133 #endif
 134 #define dnpgettext(Domainname, Msgctxt, Msgid, MsgidPlural, N) \
 135   npgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, LC_MESSAGES)
 136 #define dcnpgettext(Domainname, Msgctxt, Msgid, MsgidPlural, N, Category) \
 137   npgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, Category)
 138
 139 #ifdef __GNUC__
 140 __inline
 141 #else
 142 #ifdef __cplusplus
 143 inline
 144 #endif
 145 #endif
 146 static const char *
 147 pgettext_aux (const char *domain,
 148               const char *msg_ctxt_id, const char *msgid,
 149               int category)
 150 {
 151   const char *translation = dcgettext (domain, msg_ctxt_id, category);
 152   if (translation == msg_ctxt_id)
 153     return msgid;
 154   else
 155     return translation;
 156 }
 157
 158 #ifdef __GNUC__
 159 __inline
 160 #else
 161 #ifdef __cplusplus
 162 inline
 163 #endif
 164 #endif
 165 static const char *
 166 npgettext_aux (const char *domain,
 167                const char *msg_ctxt_id, const char *msgid,
 168                const char *msgid_plural, unsigned long int n,
 169                int category)
 170 {
 171   const char *translation =
 172     dcngettext (domain, msg_ctxt_id, msgid_plural, n, category);
 173   if (translation == msg_ctxt_id || translation == msgid_plural)
 174     return (n == 1 ? msgid : msgid_plural);
 175   else
 176     return translation;
 177 }
 178
 179 /* The same thing extended for non-constant arguments.  Here MSGCTXT and MSGID
 180    can be arbitrary expressions.  But for string literals these macros are
 181    less efficient than those above.  */
 182
 183 #include <string.h>
 184
 185 #if (((__GNUC__ >= 3 || __GNUG__ >= 2) && !defined __STRICT_ANSI__) \
 186      /* || __STDC_VERSION__ >= 199901L */ )
 187 # define _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS 1
 188 #else
 189 # define _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS 0
 190 #endif
 191
 192 #if !_LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 193 #include <stdlib.h>
 194 #endif
 195
 196 #define pgettext_expr(Msgctxt, Msgid) \
 197   dcpgettext_expr (NULL, Msgctxt, Msgid, LC_MESSAGES)
 198 #define dpgettext_expr(Domainname, Msgctxt, Msgid) \
 199   dcpgettext_expr (Domainname, Msgctxt, Msgid, LC_MESSAGES)
 200
 201 #ifdef __GNUC__
 202 __inline
 203 #else
 204 #ifdef __cplusplus
 205 inline
 206 #endif
 207 #endif
 208 static const char *
 209 dcpgettext_expr (const char *domain,
 210                  const char *msgctxt, const char *msgid,
 211                  int category)
 212 {
 213   size_t msgctxt_len = strlen (msgctxt) + 1;
 214   size_t msgid_len = strlen (msgid) + 1;
 215   const char *translation;
 216 #if _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 217   char msg_ctxt_id[msgctxt_len + msgid_len];
 218 #else
 219   char buf[1024];
 220   char *msg_ctxt_id =
 221     (msgctxt_len + msgid_len <= sizeof (buf)
 222      ? buf
 223      : (char *) malloc (msgctxt_len + msgid_len));
 224   if (msg_ctxt_id != NULL)
 225 #endif
 226     {
 227       memcpy (msg_ctxt_id, msgctxt, msgctxt_len - 1);
 228       msg_ctxt_id[msgctxt_len - 1] = '\004';
 229       memcpy (msg_ctxt_id + msgctxt_len, msgid, msgid_len);
 230       translation = dcgettext (domain, msg_ctxt_id, category);
 231 #if !_LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 232       if (msg_ctxt_id != buf)
 233         free (msg_ctxt_id);
 234 #endif
 235       if (translation != msg_ctxt_id)
 236         return translation;
 237     }
 238   return msgid;
 239 }
 240
 241 #define npgettext_expr(Msgctxt, Msgid, MsgidPlural, N) \
 242   dcnpgettext_expr (NULL, Msgctxt, Msgid, MsgidPlural, N, LC_MESSAGES)
 243 #define dnpgettext_expr(Domainname, Msgctxt, Msgid, MsgidPlural, N) \
 244   dcnpgettext_expr (Domainname, Msgctxt, Msgid, MsgidPlural, N, LC_MESSAGES)
 245
 246 #ifdef __GNUC__
 247 __inline
 248 #else
 249 #ifdef __cplusplus
 250 inline
 251 #endif
 252 #endif
 253 static const char *
 254 dcnpgettext_expr (const char *domain,
 255                   const char *msgctxt, const char *msgid,
 256                   const char *msgid_plural, unsigned long int n,
 257                   int category)
 258 {
 259   size_t msgctxt_len = strlen (msgctxt) + 1;
 260   size_t msgid_len = strlen (msgid) + 1;
 261   const char *translation;
 262 #if _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 263   char msg_ctxt_id[msgctxt_len + msgid_len];
 264 #else
 265   char buf[1024];
 266   char *msg_ctxt_id =
 267     (msgctxt_len + msgid_len <= sizeof (buf)
 268      ? buf
 269      : (char *) malloc (msgctxt_len + msgid_len));
 270   if (msg_ctxt_id != NULL)
 271 #endif
 272     {
 273       memcpy (msg_ctxt_id, msgctxt, msgctxt_len - 1);
 274       msg_ctxt_id[msgctxt_len - 1] = '\004';
 275       memcpy (msg_ctxt_id + msgctxt_len, msgid, msgid_len);
 276       translation = dcngettext (domain, msg_ctxt_id, msgid_plural, n, category);
 277 #if !_LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 278       if (msg_ctxt_id != buf)
 279         free (msg_ctxt_id);
 280 #endif
 281       if (!(translation == msg_ctxt_id || translation == msgid_plural))
 282         return translation;
 283     }
 284   return (n == 1 ? msgid : msgid_plural);
 285 }
 286
 287 #endif /* _LIBGETTEXT_H */