lib/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
   3    Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License along
  16    with this program; if not, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 #ifndef _LIBGETTEXT_H
  20 #define _LIBGETTEXT_H 1
  21
  22 /* NLS can be disabled through the configure --disable-nls option.  */
  23 #if ENABLE_NLS
  24
  25 /* Get declarations of GNU message catalog functions.  */
  26 # include <libintl.h>
  27
  28 /* You can set the DEFAULT_TEXT_DOMAIN macro to specify the domain used by
  29    the gettext() and ngettext() macros.  This is an alternative to calling
  30    textdomain(), and is useful for libraries.  */
  31 # ifdef DEFAULT_TEXT_DOMAIN
  32 #  undef gettext
  33 #  define gettext(Msgid) \
  34      dgettext (DEFAULT_TEXT_DOMAIN, Msgid)
  35 #  undef ngettext
  36 #  define ngettext(Msgid1, Msgid2, N) \
  37      dngettext (DEFAULT_TEXT_DOMAIN, Msgid1, Msgid2, N)
  38 # endif
  39
  40 #else
  41
  42 /* Solaris /usr/include/locale.h includes /usr/include/libintl.h, which
  43    chokes if dcgettext is defined as a macro.  So include it now, to make
  44    later inclusions of <locale.h> a NOP.  We don't include <libintl.h>
  45    as well because people using "gettext.h" will not include <libintl.h>,
  46    and also including <libintl.h> would fail on SunOS 4, whereas <locale.h>
  47    is OK.  */
  48 #if defined(__sun)
  49 # include <locale.h>
  50 #endif
  51
  52 /* Many header files from the libstdc++ coming with g++ 3.3 or newer include
  53    <libintl.h>, which chokes if dcgettext is defined as a macro.  So include
  54    it now, to make later inclusions of <libintl.h> a NOP.  */
  55 #if defined(__cplusplus) && defined(__GNUG__) && (__GNUC__ >= 3)
  56 # include <cstdlib>
  57 # if (__GLIBC__ >= 2 && !defined __UCLIBC__) || _GLIBCXX_HAVE_LIBINTL_H
  58 #  include <libintl.h>
  59 # endif
  60 #endif
  61
  62 /* Disabled NLS.
  63    The casts to 'const char *' serve the purpose of producing warnings
  64    for invalid uses of the value returned from these functions.
  65    On pre-ANSI systems without 'const', the config.h file is supposed to
  66    contain "#define const".  */
  67 # undef gettext
  68 # define gettext(Msgid) ((const char *) (Msgid))
  69 # undef dgettext
  70 # define dgettext(Domainname, Msgid) ((void) (Domainname), gettext (Msgid))
  71 # undef dcgettext
  72 # define dcgettext(Domainname, Msgid, Category) \
  73     ((void) (Category), dgettext (Domainname, Msgid))
  74 # undef ngettext
  75 # define ngettext(Msgid1, Msgid2, N) \
  76     ((N) == 1 \
  77      ? ((void) (Msgid2), (const char *) (Msgid1)) \
  78      : ((void) (Msgid1), (const char *) (Msgid2)))
  79 # undef dngettext
  80 # define dngettext(Domainname, Msgid1, Msgid2, N) \
  81     ((void) (Domainname), ngettext (Msgid1, Msgid2, N))
  82 # undef dcngettext
  83 # define dcngettext(Domainname, Msgid1, Msgid2, N, Category) \
  84     ((void) (Category), dngettext (Domainname, Msgid1, Msgid2, N))
  85 # undef textdomain
  86 # define textdomain(Domainname) ((const char *) (Domainname))
  87 # undef bindtextdomain
  88 # define bindtextdomain(Domainname, Dirname) \
  89     ((void) (Domainname), (const char *) (Dirname))
  90 # undef bind_textdomain_codeset
  91 # define bind_textdomain_codeset(Domainname, Codeset) \
  92     ((void) (Domainname), (const char *) (Codeset))
  93
  94 #endif
  95
  96 /* Prefer gnulib's setlocale override over libintl's setlocale override.  */
  97 #ifdef GNULIB_defined_setlocale
  98 # undef setlocale
  99 # define setlocale rpl_setlocale
 100 #endif
 101
 102 /* A pseudo function call that serves as a marker for the automated
 103    extraction of messages, but does not call gettext().  The run-time
 104    translation is done at a different place in the code.
 105    The argument, String, should be a literal string.  Concatenated strings
 106    and other string expressions won't work.
 107    The macro's expansion is not parenthesized, so that it is suitable as
 108    initializer for static 'char[]' or 'const char[]' variables.  */
 109 #define gettext_noop(String) String
 110
 111 /* The separator between msgctxt and msgid in a .mo file.  */
 112 #define GETTEXT_CONTEXT_GLUE "\004"
 113
 114 /* Pseudo function calls, taking a MSGCTXT and a MSGID instead of just a
 115    MSGID.  MSGCTXT and MSGID must be string literals.  MSGCTXT should be
 116    short and rarely need to change.
 117    The letter 'p' stands for 'particular' or 'special'.  */
 118 #ifdef DEFAULT_TEXT_DOMAIN
 119 # define pgettext(Msgctxt, Msgid) \
 120    pgettext_aux (DEFAULT_TEXT_DOMAIN, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, LC_MESSAGES)
 121 #else
 122 # define pgettext(Msgctxt, Msgid) \
 123    pgettext_aux (NULL, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, LC_MESSAGES)
 124 #endif
 125 #define dpgettext(Domainname, Msgctxt, Msgid) \
 126   pgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, LC_MESSAGES)
 127 #define dcpgettext(Domainname, Msgctxt, Msgid, Category) \
 128   pgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, Category)
 129 #ifdef DEFAULT_TEXT_DOMAIN
 130 # define npgettext(Msgctxt, Msgid, MsgidPlural, N) \
 131    npgettext_aux (DEFAULT_TEXT_DOMAIN, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, LC_MESSAGES)
 132 #else
 133 # define npgettext(Msgctxt, Msgid, MsgidPlural, N) \
 134    npgettext_aux (NULL, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, LC_MESSAGES)
 135 #endif
 136 #define dnpgettext(Domainname, Msgctxt, Msgid, MsgidPlural, N) \
 137   npgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, LC_MESSAGES)
 138 #define dcnpgettext(Domainname, Msgctxt, Msgid, MsgidPlural, N, Category) \
 139   npgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, Category)
 140
 141 #ifdef __GNUC__
 142 __inline
 143 #else
 144 #ifdef __cplusplus
 145 inline
 146 #endif
 147 #endif
 148 static const char *
 149 pgettext_aux (const char *domain,
 150               const char *msg_ctxt_id, const char *msgid,
 151               int category)
 152 {
 153   const char *translation = dcgettext (domain, msg_ctxt_id, category);
 154   if (translation == msg_ctxt_id)
 155     return msgid;
 156   else
 157     return translation;
 158 }
 159
 160 #ifdef __GNUC__
 161 __inline
 162 #else
 163 #ifdef __cplusplus
 164 inline
 165 #endif
 166 #endif
 167 static const char *
 168 npgettext_aux (const char *domain,
 169                const char *msg_ctxt_id, const char *msgid,
 170                const char *msgid_plural, unsigned long int n,
 171                int category)
 172 {
 173   const char *translation =
 174     dcngettext (domain, msg_ctxt_id, msgid_plural, n, category);
 175   if (translation == msg_ctxt_id || translation == msgid_plural)
 176     return (n == 1 ? msgid : msgid_plural);
 177   else
 178     return translation;
 179 }
 180
 181 /* The same thing extended for non-constant arguments.  Here MSGCTXT and MSGID
 182    can be arbitrary expressions.  But for string literals these macros are
 183    less efficient than those above.  */
 184
 185 #include <string.h>
 186
 187 #define _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS \
 188   (((__GNUC__ >= 3 || __GNUG__ >= 2) && !__STRICT_ANSI__) \
 189    /* || __STDC_VERSION__ >= 199901L */ )
 190
 191 #if !_LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 192 #include <stdlib.h>
 193 #endif
 194
 195 #define pgettext_expr(Msgctxt, Msgid) \
 196   dcpgettext_expr (NULL, Msgctxt, Msgid, LC_MESSAGES)
 197 #define dpgettext_expr(Domainname, Msgctxt, Msgid) \
 198   dcpgettext_expr (Domainname, Msgctxt, Msgid, LC_MESSAGES)
 199
 200 #ifdef __GNUC__
 201 __inline
 202 #else
 203 #ifdef __cplusplus
 204 inline
 205 #endif
 206 #endif
 207 static const char *
 208 dcpgettext_expr (const char *domain,
 209                  const char *msgctxt, const char *msgid,
 210                  int category)
 211 {
 212   size_t msgctxt_len = strlen (msgctxt) + 1;
 213   size_t msgid_len = strlen (msgid) + 1;
 214   const char *translation;
 215 #if _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 216   char msg_ctxt_id[msgctxt_len + msgid_len];
 217 #else
 218   char buf[1024];
 219   char *msg_ctxt_id =
 220     (msgctxt_len + msgid_len <= sizeof (buf)
 221      ? buf
 222      : (char *) malloc (msgctxt_len + msgid_len));
 223   if (msg_ctxt_id != NULL)
 224 #endif
 225     {
 226       memcpy (msg_ctxt_id, msgctxt, msgctxt_len - 1);
 227       msg_ctxt_id[msgctxt_len - 1] = '\004';
 228       memcpy (msg_ctxt_id + msgctxt_len, msgid, msgid_len);
 229       translation = dcgettext (domain, msg_ctxt_id, category);
 230 #if !_LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 231       if (msg_ctxt_id != buf)
 232         free (msg_ctxt_id);
 233 #endif
 234       if (translation != msg_ctxt_id)
 235         return translation;
 236     }
 237   return msgid;
 238 }
 239
 240 #define npgettext_expr(Msgctxt, Msgid, MsgidPlural, N) \
 241   dcnpgettext_expr (NULL, Msgctxt, Msgid, MsgidPlural, N, LC_MESSAGES)
 242 #define dnpgettext_expr(Domainname, Msgctxt, Msgid, MsgidPlural, N) \
 243   dcnpgettext_expr (Domainname, Msgctxt, Msgid, MsgidPlural, N, LC_MESSAGES)
 244
 245 #ifdef __GNUC__
 246 __inline
 247 #else
 248 #ifdef __cplusplus
 249 inline
 250 #endif
 251 #endif
 252 static const char *
 253 dcnpgettext_expr (const char *domain,
 254                   const char *msgctxt, const char *msgid,
 255                   const char *msgid_plural, unsigned long int n,
 256                   int category)
 257 {
 258   size_t msgctxt_len = strlen (msgctxt) + 1;
 259   size_t msgid_len = strlen (msgid) + 1;
 260   const char *translation;
 261 #if _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 262   char msg_ctxt_id[msgctxt_len + msgid_len];
 263 #else
 264   char buf[1024];
 265   char *msg_ctxt_id =
 266     (msgctxt_len + msgid_len <= sizeof (buf)
 267      ? buf
 268      : (char *) malloc (msgctxt_len + msgid_len));
 269   if (msg_ctxt_id != NULL)
 270 #endif
 271     {
 272       memcpy (msg_ctxt_id, msgctxt, msgctxt_len - 1);
 273       msg_ctxt_id[msgctxt_len - 1] = '\004';
 274       memcpy (msg_ctxt_id + msgctxt_len, msgid, msgid_len);
 275       translation = dcngettext (domain, msg_ctxt_id, msgid_plural, n, category);
 276 #if !_LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 277       if (msg_ctxt_id != buf)
 278         free (msg_ctxt_id);
 279 #endif
 280       if (!(translation == msg_ctxt_id || translation == msgid_plural))
 281         return translation;
 282     }
 283   return (n == 1 ? msgid : msgid_plural);
 284 }
 285
 286 #endif /* _LIBGETTEXT_H */