iconv/gconv_int.h

   1 /* Copyright (C) 1997-2017 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _GCONV_INT_H
  20 #define _GCONV_INT_H    1
  21
  22 #include "gconv.h"
  23 #include <stdlib.h>             /* For alloca used in macro below.  */
  24 #include <ctype.h>              /* For __toupper_l used in macro below.  */
  25 #include <string.h>             /* For strlen et al used in macro below.  */
  26 #include <libc-lock.h>
  27
  28 __BEGIN_DECLS
  29
  30
  31 /* Type to represent search path.  */
  32 struct path_elem
  33 {
  34   const char *name;
  35   size_t len;
  36 };
  37
  38 /* Variable with search path for `gconv' implementation.  */
  39 extern struct path_elem *__gconv_path_elem attribute_hidden;
  40 /* Maximum length of a single path element.  */
  41 extern size_t __gconv_max_path_elem_len attribute_hidden;
  42
  43
  44 /* Structure for alias definition.  Simply two strings.  */
  45 struct gconv_alias
  46 {
  47   char *fromname;
  48   char *toname;
  49 };
  50
  51
  52 /* How many character should be converted in one call?  */
  53 #define GCONV_NCHAR_GOAL        8160
  54
  55
  56 /* Structure describing one loaded shared object.  This normally are
  57    objects to perform conversation but as a special case the db shared
  58    object is also handled.  */
  59 struct __gconv_loaded_object
  60 {
  61   /* Name of the object.  It must be the first structure element.  */
  62   const char *name;
  63
  64   /* Reference counter for the db functionality.  If no conversion is
  65      needed we unload the db library.  */
  66   int counter;
  67
  68   /* The handle for the shared object.  */
  69   void *handle;
  70
  71   /* Pointer to the functions the module defines.  */
  72   __gconv_fct fct;
  73   __gconv_init_fct init_fct;
  74   __gconv_end_fct end_fct;
  75 };
  76
  77
  78 /* Description for an available conversion module.  */
  79 struct gconv_module
  80 {
  81   const char *from_string;
  82   const char *to_string;
  83
  84   int cost_hi;
  85   int cost_lo;
  86
  87   const char *module_name;
  88
  89   struct gconv_module *left;    /* Prefix smaller.  */
  90   struct gconv_module *same;    /* List of entries with identical prefix.  */
  91   struct gconv_module *right;   /* Prefix larger.  */
  92 };
  93
  94
  95 /* Flags for `gconv_open'.  */
  96 enum
  97 {
  98   GCONV_AVOID_NOCONV = 1 << 0
  99 };
 100
 101 /* When GCONV_AVOID_NOCONV is set and no conversion is needed,
 102    __GCONV_NULCONV should be returned.  */
 103 enum
 104 {
 105   __GCONV_NULCONV = -1
 106 };
 107
 108 /* Global variables.  */
 109
 110 /* Database of alias names.  */
 111 extern void *__gconv_alias_db attribute_hidden;
 112
 113 /* Array with available modules.  */
 114 extern size_t __gconv_nmodules;
 115 extern struct gconv_module *__gconv_modules_db attribute_hidden;
 116
 117 /* Value of the GCONV_PATH environment variable.  */
 118 extern const char *__gconv_path_envvar attribute_hidden;
 119
 120 /* Lock for the conversion database content.  */
 121 __libc_lock_define (extern, __gconv_lock attribute_hidden)
 122
 123
 124 /* The gconv functions expects the name to be in upper case and complete,
 125    including the trailing slashes if necessary.  */
 126 #define norm_add_slashes(str,suffix) \
 127   ({                                                                          \
 128     const char *cp = (str);                                                   \
 129     char *result;                                                             \
 130     char *tmp;                                                                \
 131     size_t cnt = 0;                                                           \
 132     const size_t suffix_len = strlen (suffix);                                \
 133                                                                               \
 134     while (*cp != '\0')                                                       \
 135       if (*cp++ == '/')                                                       \
 136         ++cnt;                                                                \
 137                                                                               \
 138     tmp = result = __alloca (cp - (str) + 3 + suffix_len);                    \
 139     cp = (str);                                                               \
 140     while (*cp != '\0')                                                       \
 141       *tmp++ = __toupper_l (*cp++, _nl_C_locobj_ptr);                         \
 142     if (cnt < 2)                                                              \
 143       {                                                                       \
 144         *tmp++ = '/';                                                         \
 145         if (cnt < 1)                                                          \
 146           {                                                                   \
 147             *tmp++ = '/';                                                     \
 148             if (suffix_len != 0)                                              \
 149               tmp = __mempcpy (tmp, suffix, suffix_len);                      \
 150           }                                                                   \
 151       }                                                                       \
 152     *tmp = '\0';                                                              \
 153     result;                                                                   \
 154   })
 155
 156
 157 /* Return in *HANDLE decriptor for transformation from FROMSET to TOSET.  */
 158 extern int __gconv_open (const char *toset, const char *fromset,
 159                          __gconv_t *handle, int flags)
 160      internal_function;
 161
 162 /* Free resources associated with transformation descriptor CD.  */
 163 extern int __gconv_close (__gconv_t cd)
 164      internal_function;
 165
 166 /* Transform at most *INBYTESLEFT bytes from buffer starting at *INBUF
 167    according to rules described by CD and place up to *OUTBYTESLEFT
 168    bytes in buffer starting at *OUTBUF.  Return number of non-identical
 169    conversions in *IRREVERSIBLE if this pointer is not null.  */
 170 extern int __gconv (__gconv_t cd, const unsigned char **inbuf,
 171                     const unsigned char *inbufend, unsigned char **outbuf,
 172                     unsigned char *outbufend, size_t *irreversible)
 173      internal_function;
 174
 175 /* Return in *HANDLE a pointer to an array with *NSTEPS elements describing
 176    the single steps necessary for transformation from FROMSET to TOSET.  */
 177 extern int __gconv_find_transform (const char *toset, const char *fromset,
 178                                    struct __gconv_step **handle,
 179                                    size_t *nsteps, int flags)
 180      internal_function;
 181
 182 /* Search for transformation in cache data.  */
 183 extern int __gconv_lookup_cache (const char *toset, const char *fromset,
 184                                  struct __gconv_step **handle, size_t *nsteps,
 185                                  int flags)
 186      internal_function;
 187
 188 /* Compare the two name for whether they are after alias expansion the
 189    same.  This function uses the cache and fails if none is
 190    loaded.  */
 191 extern int __gconv_compare_alias_cache (const char *name1, const char *name2,
 192                                         int *result) internal_function;
 193
 194 /* Free data associated with a step's structure.  */
 195 extern void __gconv_release_step (struct __gconv_step *step)
 196      internal_function;
 197
 198 /* Read all the configuration data and cache it.  */
 199 extern void __gconv_read_conf (void) attribute_hidden;
 200
 201 /* Try to read module cache file.  */
 202 extern int __gconv_load_cache (void) internal_function;
 203
 204 /* Retrieve pointer to internal cache.  */
 205 extern void *__gconv_get_cache (void);
 206
 207 /* Retrieve pointer to internal module database.  */
 208 extern struct gconv_module *__gconv_get_modules_db (void);
 209
 210 /* Retrieve pointer to internal alias database.  */
 211 extern void *__gconv_get_alias_db (void);
 212
 213 /* Determine the directories we are looking in.  */
 214 extern void __gconv_get_path (void) internal_function;
 215
 216 /* Comparison function to search alias.  */
 217 extern int __gconv_alias_compare (const void *p1, const void *p2)
 218      attribute_hidden;
 219
 220 /* Clear reference to transformation step implementations which might
 221    cause the code to be unloaded.  */
 222 extern int __gconv_close_transform (struct __gconv_step *steps,
 223                                     size_t nsteps)
 224      internal_function;
 225
 226 /* Free all resources allocated for the transformation record when
 227    using the cache.  */
 228 extern void __gconv_release_cache (struct __gconv_step *steps, size_t nsteps)
 229      internal_function;
 230
 231 /* Load shared object named by NAME.  If already loaded increment reference
 232    count.  */
 233 extern struct __gconv_loaded_object *__gconv_find_shlib (const char *name)
 234      internal_function;
 235
 236 /* Release shared object.  If no further reference is available unload
 237    the object.  */
 238 extern void __gconv_release_shlib (struct __gconv_loaded_object *handle)
 239      internal_function;
 240
 241 /* Fill STEP with information about builtin module with NAME.  */
 242 extern void __gconv_get_builtin_trans (const char *name,
 243                                        struct __gconv_step *step)
 244      internal_function;
 245
 246 libc_hidden_proto (__gconv_transliterate)
 247
 248 /* If NAME is an codeset alias expand it.  */
 249 extern int __gconv_compare_alias (const char *name1, const char *name2)
 250      internal_function;
 251
 252
 253 /* Builtin transformations.  */
 254 #ifdef _LIBC
 255 # define __BUILTIN_TRANSFORM(Name) \
 256   extern int Name (struct __gconv_step *step,                                 \
 257                    struct __gconv_step_data *data,                            \
 258                    const unsigned char **inbuf,                               \
 259                    const unsigned char *inbufend,                             \
 260                    unsigned char **outbufstart, size_t *irreversible,         \
 261                    int do_flush, int consume_incomplete)
 262
 263 __BUILTIN_TRANSFORM (__gconv_transform_ascii_internal);
 264 __BUILTIN_TRANSFORM (__gconv_transform_internal_ascii);
 265 __BUILTIN_TRANSFORM (__gconv_transform_utf8_internal);
 266 __BUILTIN_TRANSFORM (__gconv_transform_internal_utf8);
 267 __BUILTIN_TRANSFORM (__gconv_transform_ucs2_internal);
 268 __BUILTIN_TRANSFORM (__gconv_transform_internal_ucs2);
 269 __BUILTIN_TRANSFORM (__gconv_transform_ucs2reverse_internal);
 270 __BUILTIN_TRANSFORM (__gconv_transform_internal_ucs2reverse);
 271 __BUILTIN_TRANSFORM (__gconv_transform_internal_ucs4);
 272 __BUILTIN_TRANSFORM (__gconv_transform_ucs4_internal);
 273 __BUILTIN_TRANSFORM (__gconv_transform_internal_ucs4le);
 274 __BUILTIN_TRANSFORM (__gconv_transform_ucs4le_internal);
 275 __BUILTIN_TRANSFORM (__gconv_transform_internal_utf16);
 276 __BUILTIN_TRANSFORM (__gconv_transform_utf16_internal);
 277 # undef __BUITLIN_TRANSFORM
 278
 279 /* Specialized conversion function for a single byte to INTERNAL, recognizing
 280    only ASCII characters.  */
 281 extern wint_t __gconv_btwoc_ascii (struct __gconv_step *step, unsigned char c);
 282
 283 #endif
 284
 285 __END_DECLS
 286
 287 #endif /* gconv_int.h */