iconv/gconv_int.h

   1 /* Copyright (C) 1997-2005, 2006, 2007 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _GCONV_INT_H
  21 #define _GCONV_INT_H    1
  22
  23 #include "gconv.h"
  24 #include <stdlib.h>             /* For alloca used in macro below.  */
  25 #include <ctype.h>              /* For __toupper_l used in macro below.  */
  26 #include <string.h>             /* For strlen et al used in macro below.  */
  27 #include <bits/libc-lock.h>
  28
  29 __BEGIN_DECLS
  30
  31
  32 /* Type to represent search path.  */
  33 struct path_elem
  34 {
  35   const char *name;
  36   size_t len;
  37 };
  38
  39 /* Variable with search path for `gconv' implementation.  */
  40 extern struct path_elem *__gconv_path_elem attribute_hidden;
  41 /* Maximum length of a single path element.  */
  42 extern size_t __gconv_max_path_elem_len attribute_hidden;
  43
  44
  45 /* Structure for alias definition.  Simply two strings.  */
  46 struct gconv_alias
  47 {
  48   char *fromname;
  49   char *toname;
  50 };
  51
  52
  53 /* How many character should be conveted in one call?  */
  54 #define GCONV_NCHAR_GOAL        8160
  55
  56
  57 /* Structure describing one loaded shared object.  This normally are
  58    objects to perform conversation but as a special case the db shared
  59    object is also handled.  */
  60 struct __gconv_loaded_object
  61 {
  62   /* Name of the object.  It must be the first structure element.  */
  63   const char *name;
  64
  65   /* Reference counter for the db functionality.  If no conversion is
  66      needed we unload the db library.  */
  67   int counter;
  68
  69   /* The handle for the shared object.  */
  70   void *handle;
  71
  72   /* Pointer to the functions the module defines.  */
  73   __gconv_fct fct;
  74   __gconv_init_fct init_fct;
  75   __gconv_end_fct end_fct;
  76 };
  77
  78
  79 /* Description for an available conversion module.  */
  80 struct gconv_module
  81 {
  82   const char *from_string;
  83   const char *to_string;
  84
  85   int cost_hi;
  86   int cost_lo;
  87
  88   const char *module_name;
  89
  90   struct gconv_module *left;    /* Prefix smaller.  */
  91   struct gconv_module *same;    /* List of entries with identical prefix.  */
  92   struct gconv_module *right;   /* Prefix larger.  */
  93 };
  94
  95
  96 /* Internal data structure to represent transliteration module.  */
  97 struct trans_struct
  98 {
  99   const char *name;
 100   struct trans_struct *next;
 101
 102   const char **csnames;
 103   size_t ncsnames;
 104   __gconv_trans_fct trans_fct;
 105   __gconv_trans_context_fct trans_context_fct;
 106   __gconv_trans_init_fct trans_init_fct;
 107   __gconv_trans_end_fct trans_end_fct;
 108 };
 109
 110
 111 /* Flags for `gconv_open'.  */
 112 enum
 113 {
 114   GCONV_AVOID_NOCONV = 1 << 0
 115 };
 116
 117 /* When GCONV_AVOID_NOCONV is set and no conversion is needed,
 118    __GCONV_NULCONV should be returned.  */
 119 enum
 120 {
 121   __GCONV_NULCONV = -1
 122 };
 123
 124 /* Global variables.  */
 125
 126 /* Database of alias names.  */
 127 extern void *__gconv_alias_db attribute_hidden;
 128
 129 /* Array with available modules.  */
 130 extern size_t __gconv_nmodules;
 131 extern struct gconv_module *__gconv_modules_db attribute_hidden;
 132
 133 /* Value of the GCONV_PATH environment variable.  */
 134 extern const char *__gconv_path_envvar attribute_hidden;
 135
 136 /* Lock for the conversion database content.  */
 137 __libc_lock_define (extern, __gconv_lock attribute_hidden)
 138
 139
 140 /* The gconv functions expects the name to be in upper case and complete,
 141    including the trailing slashes if necessary.  */
 142 #define norm_add_slashes(str,suffix) \
 143   ({                                                                          \
 144     const char *cp = (str);                                                   \
 145     char *result;                                                             \
 146     char *tmp;                                                                \
 147     size_t cnt = 0;                                                           \
 148     const size_t suffix_len = strlen (suffix);                                \
 149                                                                               \
 150     while (*cp != '\0')                                                       \
 151       if (*cp++ == '/')                                                       \
 152         ++cnt;                                                                \
 153                                                                               \
 154     tmp = result = __alloca (cp - (str) + 3 + suffix_len);                    \
 155     cp = (str);                                                               \
 156     while (*cp != '\0')                                                       \
 157       *tmp++ = __toupper_l (*cp++, _nl_C_locobj_ptr);                         \
 158     if (cnt < 2)                                                              \
 159       {                                                                       \
 160         *tmp++ = '/';                                                         \
 161         if (cnt < 1)                                                          \
 162           {                                                                   \
 163             *tmp++ = '/';                                                     \
 164             if (suffix_len != 0)                                              \
 165               tmp = __mempcpy (tmp, suffix, suffix_len);                      \
 166           }                                                                   \
 167       }                                                                       \
 168     *tmp = '\0';                                                              \
 169     result;                                                                   \
 170   })
 171
 172
 173 /* Return in *HANDLE decriptor for transformation from FROMSET to TOSET.  */
 174 extern int __gconv_open (const char *toset, const char *fromset,
 175                          __gconv_t *handle, int flags)
 176      internal_function;
 177
 178 /* Free resources associated with transformation descriptor CD.  */
 179 extern int __gconv_close (__gconv_t cd)
 180      internal_function;
 181
 182 /* Transform at most *INBYTESLEFT bytes from buffer starting at *INBUF
 183    according to rules described by CD and place up to *OUTBYTESLEFT
 184    bytes in buffer starting at *OUTBUF.  Return number of non-identical
 185    conversions in *IRREVERSIBLE if this pointer is not null.  */
 186 extern int __gconv (__gconv_t cd, const unsigned char **inbuf,
 187                     const unsigned char *inbufend, unsigned char **outbuf,
 188                     unsigned char *outbufend, size_t *irreversible)
 189      internal_function;
 190
 191 /* Return in *HANDLE a pointer to an array with *NSTEPS elements describing
 192    the single steps necessary for transformation from FROMSET to TOSET.  */
 193 extern int __gconv_find_transform (const char *toset, const char *fromset,
 194                                    struct __gconv_step **handle,
 195                                    size_t *nsteps, int flags)
 196      internal_function;
 197
 198 /* Search for transformation in cache data.  */
 199 extern int __gconv_lookup_cache (const char *toset, const char *fromset,
 200                                  struct __gconv_step **handle, size_t *nsteps,
 201                                  int flags)
 202      internal_function;
 203
 204 /* Compare the two name for whether they are after alias expansion the
 205    same.  This function uses the cache and fails if none is
 206    loaded.  */
 207 extern int __gconv_compare_alias_cache (const char *name1, const char *name2,
 208                                         int *result) internal_function;
 209
 210 /* Free data associated with a step's structure.  */
 211 extern void __gconv_release_step (struct __gconv_step *step)
 212      internal_function;
 213
 214 /* Read all the configuration data and cache it.  */
 215 extern void __gconv_read_conf (void) attribute_hidden;
 216
 217 /* Try to read module cache file.  */
 218 extern int __gconv_load_cache (void) internal_function;
 219
 220 /* Retrieve pointer to internal cache.  */
 221 extern void *__gconv_get_cache (void);
 222
 223 /* Retrieve pointer to internal module database.  */
 224 extern struct gconv_module *__gconv_get_modules_db (void);
 225
 226 /* Retrieve pointer to internal alias database.  */
 227 extern void *__gconv_get_alias_db (void);
 228
 229 /* Determine the directories we are looking in.  */
 230 extern void __gconv_get_path (void) internal_function;
 231
 232 /* Comparison function to search alias.  */
 233 extern int __gconv_alias_compare (const void *p1, const void *p2)
 234      attribute_hidden;
 235
 236 /* Clear reference to transformation step implementations which might
 237    cause the code to be unloaded.  */
 238 extern int __gconv_close_transform (struct __gconv_step *steps,
 239                                     size_t nsteps)
 240      internal_function;
 241
 242 /* Free all resources allocated for the transformation record when
 243    using the cache.  */
 244 extern void __gconv_release_cache (struct __gconv_step *steps, size_t nsteps)
 245      internal_function;
 246
 247 /* Load shared object named by NAME.  If already loaded increment reference
 248    count.  */
 249 extern struct __gconv_loaded_object *__gconv_find_shlib (const char *name)
 250      internal_function;
 251
 252 /* Release shared object.  If no further reference is available unload
 253    the object.  */
 254 extern void __gconv_release_shlib (struct __gconv_loaded_object *handle)
 255      internal_function;
 256
 257 /* Fill STEP with information about builtin module with NAME.  */
 258 extern void __gconv_get_builtin_trans (const char *name,
 259                                        struct __gconv_step *step)
 260      internal_function;
 261
 262 /* Try to load transliteration step module.  */
 263 extern int __gconv_translit_find (struct trans_struct *trans)
 264      internal_function;
 265
 266 /* Transliteration using the locale's data.  */
 267 extern int __gconv_transliterate (struct __gconv_step *step,
 268                                   struct __gconv_step_data *step_data,
 269                                   void *trans_data,
 270                                   __const unsigned char *inbufstart,
 271                                   __const unsigned char **inbufp,
 272                                   __const unsigned char *inbufend,
 273                                   unsigned char **outbufstart,
 274                                   size_t *irreversible) attribute_hidden;
 275
 276
 277 /* If NAME is an codeset alias expand it.  */
 278 extern int __gconv_compare_alias (const char *name1, const char *name2)
 279      internal_function;
 280
 281
 282 /* Builtin transformations.  */
 283 #ifdef _LIBC
 284 # define __BUILTIN_TRANSFORM(Name) \
 285   extern int Name (struct __gconv_step *step,                                 \
 286                    struct __gconv_step_data *data,                            \
 287                    const unsigned char **inbuf,                               \
 288                    const unsigned char *inbufend,                             \
 289                    unsigned char **outbufstart, size_t *irreversible,         \
 290                    int do_flush, int consume_incomplete)
 291
 292 __BUILTIN_TRANSFORM (__gconv_transform_ascii_internal);
 293 __BUILTIN_TRANSFORM (__gconv_transform_internal_ascii);
 294 __BUILTIN_TRANSFORM (__gconv_transform_utf8_internal);
 295 __BUILTIN_TRANSFORM (__gconv_transform_internal_utf8);
 296 __BUILTIN_TRANSFORM (__gconv_transform_ucs2_internal);
 297 __BUILTIN_TRANSFORM (__gconv_transform_internal_ucs2);
 298 __BUILTIN_TRANSFORM (__gconv_transform_ucs2reverse_internal);
 299 __BUILTIN_TRANSFORM (__gconv_transform_internal_ucs2reverse);
 300 __BUILTIN_TRANSFORM (__gconv_transform_internal_ucs4);
 301 __BUILTIN_TRANSFORM (__gconv_transform_ucs4_internal);
 302 __BUILTIN_TRANSFORM (__gconv_transform_internal_ucs4le);
 303 __BUILTIN_TRANSFORM (__gconv_transform_ucs4le_internal);
 304 __BUILTIN_TRANSFORM (__gconv_transform_internal_utf16);
 305 __BUILTIN_TRANSFORM (__gconv_transform_utf16_internal);
 306 # undef __BUITLIN_TRANSFORM
 307
 308 /* Specialized conversion function for a single byte to INTERNAL, recognizing
 309    only ASCII characters.  */
 310 extern wint_t __gconv_btwoc_ascii (struct __gconv_step *step, unsigned char c);
 311
 312 #endif
 313
 314 __END_DECLS
 315
 316 #endif /* gconv_int.h */