lib/gettext.h

   1 /* Convenience header for conditional use of GNU <libintl.h>.
   2    Copyright (C) 1995-1998, 2000-2002, 2004-2006 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 2, or (at your option)
   7    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 along
  15    with this program; if not, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 #ifndef _LIBGETTEXT_H
  19 #define _LIBGETTEXT_H 1
  20
  21 /* NLS can be disabled through the configure --disable-nls option.  */
  22 #if ENABLE_NLS
  23
  24 /* Get declarations of GNU message catalog functions.  */
  25 # include <libintl.h>
  26
  27 /* You can set the DEFAULT_TEXT_DOMAIN macro to specify the domain used by
  28    the gettext() and ngettext() macros.  This is an alternative to calling
  29    textdomain(), and is useful for libraries.  */
  30 # ifdef DEFAULT_TEXT_DOMAIN
  31 #  undef gettext
  32 #  define gettext(Msgid) \
  33      dgettext (DEFAULT_TEXT_DOMAIN, Msgid)
  34 #  undef ngettext
  35 #  define ngettext(Msgid1, Msgid2, N) \
  36      dngettext (DEFAULT_TEXT_DOMAIN, Msgid1, Msgid2, N)
  37 # endif
  38
  39 #else
  40
  41 /* Solaris /usr/include/locale.h includes /usr/include/libintl.h, which
  42    chokes if dcgettext is defined as a macro.  So include it now, to make
  43    later inclusions of <locale.h> a NOP.  We don't include <libintl.h>
  44    as well because people using "gettext.h" will not include <libintl.h>,
  45    and also including <libintl.h> would fail on SunOS 4, whereas <locale.h>
  46    is OK.  */
  47 #if defined(__sun)
  48 # include <locale.h>
  49 #endif
  50
  51 /* Many header files from the libstdc++ coming with g++ 3.3 or newer include
  52    <libintl.h>, which chokes if dcgettext is defined as a macro.  So include
  53    it now, to make later inclusions of <libintl.h> a NOP.  */
  54 #if defined(__cplusplus) && defined(__GNUG__) && (__GNUC__ >= 3)
  55 # include <cstdlib>
  56 # if (__GLIBC__ >= 2) || _GLIBCXX_HAVE_LIBINTL_H
  57 #  include <libintl.h>
  58 # endif
  59 #endif
  60
  61 /* Disabled NLS.
  62    The casts to 'const char *' serve the purpose of producing warnings
  63    for invalid uses of the value returned from these functions.
  64    On pre-ANSI systems without 'const', the config.h file is supposed to
  65    contain "#define const".  */
  66 # define gettext(Msgid) ((const char *) (Msgid))
  67 # define dgettext(Domainname, Msgid) ((void) (Domainname), gettext (Msgid))
  68 # define dcgettext(Domainname, Msgid, Category) \
  69     ((void) (Category), dgettext (Domainname, Msgid))
  70 # define ngettext(Msgid1, Msgid2, N) \
  71     ((N) == 1 \
  72      ? ((void) (Msgid2), (const char *) (Msgid1)) \
  73      : ((void) (Msgid1), (const char *) (Msgid2)))
  74 # define dngettext(Domainname, Msgid1, Msgid2, N) \
  75     ((void) (Domainname), ngettext (Msgid1, Msgid2, N))
  76 # define dcngettext(Domainname, Msgid1, Msgid2, N, Category) \
  77     ((void) (Category), dngettext(Domainname, Msgid1, Msgid2, N))
  78 # define textdomain(Domainname) ((const char *) (Domainname))
  79 # define bindtextdomain(Domainname, Dirname) \
  80     ((void) (Domainname), (const char *) (Dirname))
  81 # define bind_textdomain_codeset(Domainname, Codeset) \
  82     ((void) (Domainname), (const char *) (Codeset))
  83
  84 #endif
  85
  86 /* A pseudo function call that serves as a marker for the automated
  87    extraction of messages, but does not call gettext().  The run-time
  88    translation is done at a different place in the code.
  89    The argument, String, should be a literal string.  Concatenated strings
  90    and other string expressions won't work.
  91    The macro's expansion is not parenthesized, so that it is suitable as
  92    initializer for static 'char[]' or 'const char[]' variables.  */
  93 #define gettext_noop(String) String
  94
  95 /* The separator between msgctxt and msgid in a .mo file.  */
  96 #define GETTEXT_CONTEXT_GLUE "\004"
  97
  98 /* Pseudo function calls, taking a MSGCTXT and a MSGID instead of just a
  99    MSGID.  MSGCTXT and MSGID must be string literals.  MSGCTXT should be
 100    short and rarely need to change.
 101    The letter 'p' stands for 'particular' or 'special'.  */
 102 #ifdef DEFAULT_TEXT_DOMAIN
 103 # define pgettext(Msgctxt, Msgid) \
 104    pgettext_aux (DEFAULT_TEXT_DOMAIN, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, LC_MESSAGES)
 105 #else
 106 # define pgettext(Msgctxt, Msgid) \
 107    pgettext_aux (NULL, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, LC_MESSAGES)
 108 #endif
 109 #define dpgettext(Domainname, Msgctxt, Msgid) \
 110   pgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, LC_MESSAGES)
 111 #define dcpgettext(Domainname, Msgctxt, Msgid, Category) \
 112   pgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, Category)
 113 #ifdef DEFAULT_TEXT_DOMAIN
 114 # define npgettext(Msgctxt, Msgid, MsgidPlural, N) \
 115    npgettext_aux (DEFAULT_TEXT_DOMAIN, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, LC_MESSAGES)
 116 #else
 117 # define npgettext(Msgctxt, Msgid, MsgidPlural, N) \
 118    npgettext_aux (NULL, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, LC_MESSAGES)
 119 #endif
 120 #define dnpgettext(Domainname, Msgctxt, Msgid, MsgidPlural, N) \
 121   npgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, LC_MESSAGES)
 122 #define dcnpgettext(Domainname, Msgctxt, Msgid, MsgidPlural, N, Category) \
 123   npgettext_aux (Domainname, Msgctxt GETTEXT_CONTEXT_GLUE Msgid, Msgid, MsgidPlural, N, Category)
 124
 125 #ifdef __GNUC__
 126 __inline
 127 #else
 128 #ifdef __cplusplus
 129 inline
 130 #endif
 131 #endif
 132 static const char *
 133 pgettext_aux (const char *domain,
 134               const char *msg_ctxt_id, const char *msgid,
 135               int category)
 136 {
 137   const char *translation = dcgettext (domain, msg_ctxt_id, category);
 138   if (translation == msg_ctxt_id)
 139     return msgid;
 140   else
 141     return translation;
 142 }
 143
 144 #ifdef __GNUC__
 145 __inline
 146 #else
 147 #ifdef __cplusplus
 148 inline
 149 #endif
 150 #endif
 151 static const char *
 152 npgettext_aux (const char *domain,
 153                const char *msg_ctxt_id, const char *msgid,
 154                const char *msgid_plural, unsigned long int n,
 155                int category)
 156 {
 157   const char *translation =
 158     dcngettext (domain, msg_ctxt_id, msgid_plural, n, category);
 159   if (translation == msg_ctxt_id || translation == msgid_plural)
 160     return (n == 1 ? msgid : msgid_plural);
 161   else
 162     return translation;
 163 }
 164
 165 /* The same thing extended for non-constant arguments.  Here MSGCTXT and MSGID
 166    can be arbitrary expressions.  But for string literals these macros are
 167    less efficient than those above.  */
 168
 169 #include <string.h>
 170
 171 #define _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS \
 172   (((__GNUC__ >= 3 || __GNUG__ >= 2) && !__STRICT_ANSI__) \
 173    /* || __STDC_VERSION__ >= 199901L */ )
 174
 175 #if !_LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 176 #include <stdlib.h>
 177 #endif
 178
 179 #define pgettext_expr(Msgctxt, Msgid) \
 180   dcpgettext_expr (NULL, Msgctxt, Msgid, LC_MESSAGES)
 181 #define dpgettext_expr(Domainname, Msgctxt, Msgid) \
 182   dcpgettext_expr (Domainname, Msgctxt, Msgid, LC_MESSAGES)
 183
 184 #ifdef __GNUC__
 185 __inline
 186 #else
 187 #ifdef __cplusplus
 188 inline
 189 #endif
 190 #endif
 191 static const char *
 192 dcpgettext_expr (const char *domain,
 193                  const char *msgctxt, const char *msgid,
 194                  int category)
 195 {
 196   size_t msgctxt_len = strlen (msgctxt) + 1;
 197   size_t msgid_len = strlen (msgid) + 1;
 198   const char *translation;
 199 #if _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 200   char msg_ctxt_id[msgctxt_len + msgid_len];
 201 #else
 202   char buf[1024];
 203   char *msg_ctxt_id =
 204     (msgctxt_len + msgid_len <= sizeof (buf)
 205      ? buf
 206      : (char *) malloc (msgctxt_len + msgid_len));
 207   if (msg_ctxt_id != NULL)
 208 #endif
 209     {
 210       memcpy (msg_ctxt_id, msgctxt, msgctxt_len - 1);
 211       msg_ctxt_id[msgctxt_len - 1] = '\004';
 212       memcpy (msg_ctxt_id + msgctxt_len, msgid, msgid_len);
 213       translation = dcgettext (domain, msg_ctxt_id, category);
 214 #if !_LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 215       if (msg_ctxt_id != buf)
 216         free (msg_ctxt_id);
 217 #endif
 218       if (translation != msg_ctxt_id)
 219         return translation;
 220     }
 221   return msgid;
 222 }
 223
 224 #define npgettext_expr(Msgctxt, Msgid, MsgidPlural, N) \
 225   dcnpgettext_expr (NULL, Msgctxt, Msgid, MsgidPlural, N, LC_MESSAGES)
 226 #define dnpgettext_expr(Domainname, Msgctxt, Msgid, MsgidPlural, N) \
 227   dcnpgettext_expr (Domainname, Msgctxt, Msgid, MsgidPlural, N, LC_MESSAGES)
 228
 229 #ifdef __GNUC__
 230 __inline
 231 #else
 232 #ifdef __cplusplus
 233 inline
 234 #endif
 235 #endif
 236 static const char *
 237 dcnpgettext_expr (const char *domain,
 238                   const char *msgctxt, const char *msgid,
 239                   const char *msgid_plural, unsigned long int n,
 240                   int category)
 241 {
 242   size_t msgctxt_len = strlen (msgctxt) + 1;
 243   size_t msgid_len = strlen (msgid) + 1;
 244   const char *translation;
 245 #if _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 246   char msg_ctxt_id[msgctxt_len + msgid_len];
 247 #else
 248   char buf[1024];
 249   char *msg_ctxt_id =
 250     (msgctxt_len + msgid_len <= sizeof (buf)
 251      ? buf
 252      : (char *) malloc (msgctxt_len + msgid_len));
 253   if (msg_ctxt_id != NULL)
 254 #endif
 255     {
 256       memcpy (msg_ctxt_id, msgctxt, msgctxt_len - 1);
 257       msg_ctxt_id[msgctxt_len - 1] = '\004';
 258       memcpy (msg_ctxt_id + msgctxt_len, msgid, msgid_len);
 259       translation = dcngettext (domain, msg_ctxt_id, msgid_plural, n, category);
 260 #if !_LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 261       if (msg_ctxt_id != buf)
 262         free (msg_ctxt_id);
 263 #endif
 264       if (!(translation == msg_ctxt_id || translation == msgid_plural))
 265         return translation;
 266     }
 267   return (n == 1 ? msgid : msgid_plural);
 268 }
 269
 270 #endif /* _LIBGETTEXT_H */