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glibc/iconv/gconv_int.h

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/* Copyright (C) 1997-2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _GCONV_INT_H
#define _GCONV_INT_H 1
#include "gconv.h"
#include <stdlib.h> /* For alloca used in macro below. */
#include <ctype.h> /* For __toupper_l used in macro below. */
#include <string.h> /* For strlen et al used in macro below. */
#include <bits/libc-lock.h>
__BEGIN_DECLS
/* Type to represent search path. */
struct path_elem
{
const char *name;
size_t len;
};
/* Variable with search path for `gconv' implementation. */
extern struct path_elem *__gconv_path_elem attribute_hidden;
/* Maximum length of a single path element. */
extern size_t __gconv_max_path_elem_len attribute_hidden;
/* Structure for alias definition. Simply two strings. */
struct gconv_alias
{
char *fromname;
char *toname;
};
/* How many character should be converted in one call? */
#define GCONV_NCHAR_GOAL 8160
/* Structure describing one loaded shared object. This normally are
objects to perform conversation but as a special case the db shared
object is also handled. */
struct __gconv_loaded_object
{
/* Name of the object. It must be the first structure element. */
const char *name;
/* Reference counter for the db functionality. If no conversion is
needed we unload the db library. */
int counter;
/* The handle for the shared object. */
void *handle;
/* Pointer to the functions the module defines. */
__gconv_fct fct;
__gconv_init_fct init_fct;
__gconv_end_fct end_fct;
};
/* Description for an available conversion module. */
struct gconv_module
{
const char *from_string;
const char *to_string;
int cost_hi;
int cost_lo;
const char *module_name;
struct gconv_module *left; /* Prefix smaller. */
struct gconv_module *same; /* List of entries with identical prefix. */
struct gconv_module *right; /* Prefix larger. */
};
/* Internal data structure to represent transliteration module. */
struct trans_struct
{
const char *name;
struct trans_struct *next;
const char **csnames;
size_t ncsnames;
__gconv_trans_fct trans_fct;
__gconv_trans_context_fct trans_context_fct;
__gconv_trans_init_fct trans_init_fct;
__gconv_trans_end_fct trans_end_fct;
};
/* Flags for `gconv_open'. */
enum
{
GCONV_AVOID_NOCONV = 1 << 0
};
/* When GCONV_AVOID_NOCONV is set and no conversion is needed,
__GCONV_NULCONV should be returned. */
enum
{
__GCONV_NULCONV = -1
};
/* Global variables. */
/* Database of alias names. */
extern void *__gconv_alias_db attribute_hidden;
/* Array with available modules. */
extern size_t __gconv_nmodules;
extern struct gconv_module *__gconv_modules_db attribute_hidden;
/* Value of the GCONV_PATH environment variable. */
extern const char *__gconv_path_envvar attribute_hidden;
/* Lock for the conversion database content. */
__libc_lock_define (extern, __gconv_lock attribute_hidden)
/* The gconv functions expects the name to be in upper case and complete,
including the trailing slashes if necessary. */
#define norm_add_slashes(str,suffix) \
({ \
const char *cp = (str); \
char *result; \
char *tmp; \
size_t cnt = 0; \
const size_t suffix_len = strlen (suffix); \
\
while (*cp != '\0') \
if (*cp++ == '/') \
++cnt; \
\
tmp = result = __alloca (cp - (str) + 3 + suffix_len); \
cp = (str); \
while (*cp != '\0') \
*tmp++ = __toupper_l (*cp++, _nl_C_locobj_ptr); \
if (cnt < 2) \
{ \
*tmp++ = '/'; \
if (cnt < 1) \
{ \
*tmp++ = '/'; \
if (suffix_len != 0) \
tmp = __mempcpy (tmp, suffix, suffix_len); \
} \
} \
*tmp = '\0'; \
result; \
})
/* Return in *HANDLE decriptor for transformation from FROMSET to TOSET. */
extern int __gconv_open (const char *toset, const char *fromset,
__gconv_t *handle, int flags)
internal_function;
/* Free resources associated with transformation descriptor CD. */
extern int __gconv_close (__gconv_t cd)
internal_function;
/* Transform at most *INBYTESLEFT bytes from buffer starting at *INBUF
according to rules described by CD and place up to *OUTBYTESLEFT
bytes in buffer starting at *OUTBUF. Return number of non-identical
conversions in *IRREVERSIBLE if this pointer is not null. */
extern int __gconv (__gconv_t cd, const unsigned char **inbuf,
const unsigned char *inbufend, unsigned char **outbuf,
unsigned char *outbufend, size_t *irreversible)
internal_function;
/* Return in *HANDLE a pointer to an array with *NSTEPS elements describing
the single steps necessary for transformation from FROMSET to TOSET. */
extern int __gconv_find_transform (const char *toset, const char *fromset,
struct __gconv_step **handle,
size_t *nsteps, int flags)
internal_function;
/* Search for transformation in cache data. */
extern int __gconv_lookup_cache (const char *toset, const char *fromset,
struct __gconv_step **handle, size_t *nsteps,
int flags)
internal_function;
/* Compare the two name for whether they are after alias expansion the
same. This function uses the cache and fails if none is
loaded. */
extern int __gconv_compare_alias_cache (const char *name1, const char *name2,
int *result) internal_function;
/* Free data associated with a step's structure. */
extern void __gconv_release_step (struct __gconv_step *step)
internal_function;
/* Read all the configuration data and cache it. */
extern void __gconv_read_conf (void) attribute_hidden;
/* Try to read module cache file. */
extern int __gconv_load_cache (void) internal_function;
/* Retrieve pointer to internal cache. */
extern void *__gconv_get_cache (void);
/* Retrieve pointer to internal module database. */
extern struct gconv_module *__gconv_get_modules_db (void);
/* Retrieve pointer to internal alias database. */
extern void *__gconv_get_alias_db (void);
/* Determine the directories we are looking in. */
extern void __gconv_get_path (void) internal_function;
/* Comparison function to search alias. */
extern int __gconv_alias_compare (const void *p1, const void *p2)
attribute_hidden;
/* Clear reference to transformation step implementations which might
cause the code to be unloaded. */
extern int __gconv_close_transform (struct __gconv_step *steps,
size_t nsteps)
internal_function;
/* Free all resources allocated for the transformation record when
using the cache. */
extern void __gconv_release_cache (struct __gconv_step *steps, size_t nsteps)
internal_function;
/* Load shared object named by NAME. If already loaded increment reference
count. */
extern struct __gconv_loaded_object *__gconv_find_shlib (const char *name)
internal_function;
/* Release shared object. If no further reference is available unload
the object. */
extern void __gconv_release_shlib (struct __gconv_loaded_object *handle)
internal_function;
/* Fill STEP with information about builtin module with NAME. */
extern void __gconv_get_builtin_trans (const char *name,
struct __gconv_step *step)
internal_function;
/* Try to load transliteration step module. */
extern int __gconv_translit_find (struct trans_struct *trans)
internal_function;
/* Transliteration using the locale's data. */
extern int __gconv_transliterate (struct __gconv_step *step,
struct __gconv_step_data *step_data,
void *trans_data,
const unsigned char *inbufstart,
const unsigned char **inbufp,
const unsigned char *inbufend,
unsigned char **outbufstart,
size_t *irreversible) attribute_hidden;
/* If NAME is an codeset alias expand it. */
extern int __gconv_compare_alias (const char *name1, const char *name2)
internal_function;
/* Builtin transformations. */
#ifdef _LIBC
# define __BUILTIN_TRANSFORM(Name) \
extern int Name (struct __gconv_step *step, \
struct __gconv_step_data *data, \
const unsigned char **inbuf, \
const unsigned char *inbufend, \
unsigned char **outbufstart, size_t *irreversible, \
int do_flush, int consume_incomplete)
__BUILTIN_TRANSFORM (__gconv_transform_ascii_internal);
__BUILTIN_TRANSFORM (__gconv_transform_internal_ascii);
__BUILTIN_TRANSFORM (__gconv_transform_utf8_internal);
__BUILTIN_TRANSFORM (__gconv_transform_internal_utf8);
__BUILTIN_TRANSFORM (__gconv_transform_ucs2_internal);
__BUILTIN_TRANSFORM (__gconv_transform_internal_ucs2);
__BUILTIN_TRANSFORM (__gconv_transform_ucs2reverse_internal);
__BUILTIN_TRANSFORM (__gconv_transform_internal_ucs2reverse);
__BUILTIN_TRANSFORM (__gconv_transform_internal_ucs4);
__BUILTIN_TRANSFORM (__gconv_transform_ucs4_internal);
__BUILTIN_TRANSFORM (__gconv_transform_internal_ucs4le);
__BUILTIN_TRANSFORM (__gconv_transform_ucs4le_internal);
__BUILTIN_TRANSFORM (__gconv_transform_internal_utf16);
__BUILTIN_TRANSFORM (__gconv_transform_utf16_internal);
# undef __BUITLIN_TRANSFORM
/* Specialized conversion function for a single byte to INTERNAL, recognizing
only ASCII characters. */
extern wint_t __gconv_btwoc_ascii (struct __gconv_step *step, unsigned char c);
#endif
__END_DECLS
#endif /* gconv_int.h */
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