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/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* This header provides no interface for a user to the internals of
the gconv implementation in the libc. Therefore there is no use
for these definitions beside for writing additional gconv modules. */
#ifndef _GCONV_H
#define _GCONV_H 1
#include <features.h>
#include <wchar.h>
#define __need_size_t
#include <stddef.h>
/* ISO 10646 value used to signal invalid value. */
#define UNKNOWN_10646_CHAR ((wchar_t) 0xfffd)
/* Error codes for gconv functions. */
enum
{
GCONV_OK = 0,
GCONV_NOCONV,
GCONV_NODB,
GCONV_NOMEM,
GCONV_EMPTY_INPUT,
GCONV_FULL_OUTPUT,
GCONV_ILLEGAL_INPUT,
GCONV_INCOMPLETE_INPUT,
GCONV_ILLEGAL_DESCRIPTOR,
GCONV_INTERNAL_ERROR
};
/* Forward declarations. */
struct gconv_step;
struct gconv_step_data;
struct gconv_loaded_object;
/* Type of a conversion function. */
typedef int (*gconv_fct) __PMT ((struct gconv_step *,
struct gconv_step_data *,
__const unsigned char **,
__const unsigned char *, size_t *, int));
/* Constructor and destructor for local data for conversion step. */
typedef int (*gconv_init_fct) __PMT ((struct gconv_step *));
typedef void (*gconv_end_fct) __PMT ((struct gconv_step *));
/* Description of a conversion step. */
struct gconv_step
{
struct gconv_loaded_object *shlib_handle;
__const char *modname;
int counter;
__const char *from_name;
__const char *to_name;
gconv_fct fct;
gconv_init_fct init_fct;
gconv_end_fct end_fct;
/* Information about the number of bytes needed or produced in this
step. This helps optimizing the buffer sizes. */
int min_needed_from;
int max_needed_from;
int min_needed_to;
int max_needed_to;
/* Flag whether this is a stateful encoding or not. */
int stateful;
void *data; /* Pointer to step-local data. */
};
/* Additional data for steps in use of conversion descriptor. This is
allocated by the `init' function. */
struct gconv_step_data
{
unsigned char *outbuf; /* Output buffer for this step. */
unsigned char *outbufend; /* Address of first byte after the output buffer.*/
/* Is this the last module in the chain. */
int is_last;
/* Counter for number of invocations of the module function for this
descriptor. */
int invocation_counter;
/* Flag whether this is an internal use of the module (in the mb*towc*
and wc*tomb* functions) or regular with iconv(3). */
int internal_use;
mbstate_t *statep;
mbstate_t __state; /* This element should not be used directly by
any module; always use STATEP! */
};
/* Combine conversion step description with data. */
typedef struct gconv_info
{
size_t nsteps;
struct gconv_step *steps;
struct gconv_step_data *data;
} *gconv_t;
#endif /* gconv.h */
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