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      1 /*
      2  * Copyright (c) 1999
      3  * Silicon Graphics Computer Systems, Inc.
      4  *
      5  * Copyright (c) 1999
      6  * Boris Fomitchev
      7  *
      8  * This material is provided "as is", with absolutely no warranty expressed
      9  * or implied. Any use is at your own risk.
     10  *
     11  * Permission to use or copy this software for any purpose is hereby granted
     12  * without fee, provided the above notices are retained on all copies.
     13  * Permission to modify the code and to distribute modified code is granted,
     14  * provided the above notices are retained, and a notice that the code was
     15  * modified is included with the above copyright notice.
     16  *
     17  */
     18 #ifndef MESSAGE_FACETS_H
     19 #define MESSAGE_FACETS_H
     20 
     21 #include <string>
     22 #include <locale>
     23 #include <hash_map>
     24 
     25 #include "c_locale.h"
     26 
     27 _STLP_BEGIN_NAMESPACE
     28 _STLP_MOVE_TO_PRIV_NAMESPACE
     29 
     30 // Class _Catalog_locale_map.  The reason for this is that, internally,
     31 // a message string is always a char*.  We need a ctype facet to convert
     32 // a string to and from wchar_t, and the user is permitted to provide such
     33 // a facet when calling open().
     34 
     35 struct _Catalog_locale_map {
     36   _Catalog_locale_map() : M(0) {}
     37   ~_Catalog_locale_map() { if (M) delete M; }
     38 
     39   void insert(nl_catd_type key, const locale& L);
     40   locale lookup(nl_catd_type key) const;
     41   void erase(nl_catd_type key);
     42 
     43   typedef hash_map<nl_catd_type, locale, hash<nl_catd_type>, equal_to<nl_catd_type>,
     44                    allocator<pair<_STLP_CONST nl_catd_type, locale> > > map_type;
     45   map_type *M;
     46 
     47 private:                        // Invalidate copy constructor and assignment
     48   _Catalog_locale_map(const _Catalog_locale_map&);
     49   void operator=(const _Catalog_locale_map&);
     50 };
     51 
     52 /*
     53  * In glibc nl_catd type is void *, but messages_base::catalog is defined as int
     54  * by ISO/IEC 14882; The int may be too short to store pointer on 64-bit platforms;
     55  * Another problem, is that do_open() may return negative value to indicate that no
     56  * catalog open---this case can't be represented with pointers.
     57  * The class _Catalog_nl_catd_map intended to make relation between
     58  * messages_base::catalog and nl_catd handler.
     59  *
     60  */
     61 
     62 #if defined (_STLP_USE_GLIBC2_LOCALIZATION)
     63 #  define _STLP_USE_NL_CATD_MAPPING
     64 #else
     65 /* If no mapping a message_base::catalog entry, int typedef according C++ Standard 22.2.7.1,
     66  * has to be large enough to contain a nl_catd_type value.
     67  */
     68 _STLP_STATIC_ASSERT(sizeof(nl_catd_type) <= sizeof(int))
     69 #endif
     70 
     71 class _STLP_CLASS_DECLSPEC _Catalog_nl_catd_map {
     72 public:
     73   _Catalog_nl_catd_map()
     74   {}
     75   ~_Catalog_nl_catd_map()
     76   {}
     77 
     78   typedef hash_map<messages_base::catalog, nl_catd_type, hash<messages_base::catalog>, equal_to<messages_base::catalog>,
     79                    allocator<pair<_STLP_CONST messages_base::catalog, nl_catd_type> > > map_type;
     80   typedef hash_map<nl_catd_type, messages_base::catalog, hash<nl_catd_type>, equal_to<nl_catd_type>,
     81                    allocator<pair<_STLP_CONST nl_catd_type, messages_base::catalog> > > rmap_type;
     82   // typedef map<messages_base::catalog,nl_catd_type> map_type;
     83   // typedef map<nl_catd_type,messages_base::catalog> rmap_type;
     84 
     85   messages_base::catalog insert(nl_catd_type cat)
     86 #if !defined (_STLP_USE_NL_CATD_MAPPING)
     87   { return (messages_base::catalog)cat; }
     88 #else
     89   ;
     90 #endif
     91 
     92   void erase(messages_base::catalog)
     93 #if !defined (_STLP_USE_NL_CATD_MAPPING)
     94   {}
     95 #else
     96   ;
     97 #endif
     98 
     99   nl_catd_type operator [] ( messages_base::catalog cat )
    100 #if !defined (_STLP_USE_NL_CATD_MAPPING)
    101   { return cat; }
    102 #else
    103   { return cat < 0 ? 0 : M[cat]; }
    104 #endif
    105 
    106 private:
    107   _Catalog_nl_catd_map(const _Catalog_nl_catd_map&);
    108   _Catalog_nl_catd_map& operator =(const _Catalog_nl_catd_map&);
    109 
    110 #if defined (_STLP_USE_NL_CATD_MAPPING)
    111   map_type M;
    112   rmap_type Mr;
    113   static _STLP_VOLATILE __stl_atomic_t _count;
    114 #endif
    115 };
    116 
    117 class _Messages {
    118 public:
    119   typedef messages_base::catalog catalog;
    120 
    121   _Messages(bool, const char *name);
    122   _Messages(bool, _Locale_messages*);
    123 
    124   catalog do_open(const string& __fn, const locale& __loc) const;
    125   string do_get(catalog __c, int __set, int __msgid,
    126                 const string& __dfault) const;
    127 #if !defined (_STLP_NO_WCHAR_T)
    128   wstring do_get(catalog __c, int __set, int __msgid,
    129                  const wstring& __dfault) const;
    130 #endif
    131   void do_close(catalog __c) const;
    132   ~_Messages();
    133 
    134 private:
    135   _Locale_messages* _M_message_obj;
    136   _Catalog_locale_map* _M_map;
    137   mutable _Catalog_nl_catd_map _M_cat;
    138 
    139   //private definition to avoid warning (with ICL)
    140   _Messages(const _Messages&);
    141   _Messages& operator=(const _Messages&);
    142 };
    143 
    144 _STLP_MOVE_TO_STD_NAMESPACE
    145 
    146 _STLP_END_NAMESPACE
    147 
    148 #endif
    149 
    150 // Local Variables:
    151 // mode:C++
    152 // End:
    153