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1/* Copyright (C) 1997-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18/* This header provides no interface for a user to the internals of
19 the gconv implementation in the libc. Therefore there is no use
20 for these definitions beside for writing additional gconv modules. */
21
22#ifndef _GCONV_H
23#define _GCONV_H 1
24
25#include <features.h>
26#define __need_mbstate_t
27#define __need_wint_t
28#include <wchar.h>
29#define __need_size_t
30#define __need_wchar_t
31#include <stddef.h>
32
33/* ISO 10646 value used to signal invalid value. */
34#define __UNKNOWN_10646_CHAR ((wchar_t) 0xfffd)
35
36/* Error codes for gconv functions. */
37enum
38{
39 __GCONV_OK = 0,
40 __GCONV_NOCONV,
41 __GCONV_NODB,
42 __GCONV_NOMEM,
43
44 __GCONV_EMPTY_INPUT,
45 __GCONV_FULL_OUTPUT,
46 __GCONV_ILLEGAL_INPUT,
47 __GCONV_INCOMPLETE_INPUT,
48
49 __GCONV_ILLEGAL_DESCRIPTOR,
50 __GCONV_INTERNAL_ERROR
51};
52
53
54/* Flags the `__gconv_open' function can set. */
55enum
56{
57 __GCONV_IS_LAST = 0x0001,
58 __GCONV_IGNORE_ERRORS = 0x0002,
59 __GCONV_SWAP = 0x0004
60};
61
62
63/* Forward declarations. */
64struct __gconv_step;
65struct __gconv_step_data;
66struct __gconv_loaded_object;
67struct __gconv_trans_data;
68
69
70/* Type of a conversion function. */
71typedef int (*__gconv_fct) (struct __gconv_step *, struct __gconv_step_data *,
72 const unsigned char **, const unsigned char *,
73 unsigned char **, size_t *, int, int);
74
75/* Type of a specialized conversion function for a single byte to INTERNAL. */
76typedef wint_t (*__gconv_btowc_fct) (struct __gconv_step *, unsigned char);
77
78/* Constructor and destructor for local data for conversion step. */
79typedef int (*__gconv_init_fct) (struct __gconv_step *);
80typedef void (*__gconv_end_fct) (struct __gconv_step *);
81
82
83/* Type of a transliteration/transscription function. */
84typedef int (*__gconv_trans_fct) (struct __gconv_step *,
85 struct __gconv_step_data *, void *,
86 const unsigned char *,
87 const unsigned char **,
88 const unsigned char *, unsigned char **,
89 size_t *);
90
91/* Function to call to provide transliteration module with context. */
92typedef int (*__gconv_trans_context_fct) (void *, const unsigned char *,
93 const unsigned char *,
94 unsigned char *, unsigned char *);
95
96/* Function to query module about supported encoded character sets. */
97typedef int (*__gconv_trans_query_fct) (const char *, const char ***,
98 size_t *);
99
100/* Constructor and destructor for local data for transliteration. */
101typedef int (*__gconv_trans_init_fct) (void **, const char *);
102typedef void (*__gconv_trans_end_fct) (void *);
103
104struct __gconv_trans_data
105{
106 /* Transliteration/Transscription function. */
107 __gconv_trans_fct __trans_fct;
108 __gconv_trans_context_fct __trans_context_fct;
109 __gconv_trans_end_fct __trans_end_fct;
110 void *__data;
111 struct __gconv_trans_data *__next;
112};
113
114
115/* Description of a conversion step. */
116struct __gconv_step
117{
118 struct __gconv_loaded_object *__shlib_handle;
119 const char *__modname;
120
121 int __counter;
122
123 char *__from_name;
124 char *__to_name;
125
126 __gconv_fct __fct;
127 __gconv_btowc_fct __btowc_fct;
128 __gconv_init_fct __init_fct;
129 __gconv_end_fct __end_fct;
130
131 /* Information about the number of bytes needed or produced in this
132 step. This helps optimizing the buffer sizes. */
133 int __min_needed_from;
134 int __max_needed_from;
135 int __min_needed_to;
136 int __max_needed_to;
137
138 /* Flag whether this is a stateful encoding or not. */
139 int __stateful;
140
141 void *__data; /* Pointer to step-local data. */
142};
143
144/* Additional data for steps in use of conversion descriptor. This is
145 allocated by the `init' function. */
146struct __gconv_step_data
147{
148 unsigned char *__outbuf; /* Output buffer for this step. */
149 unsigned char *__outbufend; /* Address of first byte after the output
150 buffer. */
151
152 /* Is this the last module in the chain. */
153 int __flags;
154
155 /* Counter for number of invocations of the module function for this
156 descriptor. */
157 int __invocation_counter;
158
159 /* Flag whether this is an internal use of the module (in the mb*towc*
160 and wc*tomb* functions) or regular with iconv(3). */
161 int __internal_use;
162
163 __mbstate_t *__statep;
164 __mbstate_t __state; /* This element must not be used directly by
165 any module; always use STATEP! */
166
167 /* Transliteration information. */
168 struct __gconv_trans_data *__trans;
169};
170
171
172/* Combine conversion step description with data. */
173typedef struct __gconv_info
174{
175 size_t __nsteps;
176 struct __gconv_step *__steps;
177 __extension__ struct __gconv_step_data __data __flexarr;
178} *__gconv_t;
179
180#endif /* gconv.h */
181

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