1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/* Find matching transformation algorithms and initialize steps.
Copyright (C) 1997-2024 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 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
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <locale.h>
#include "../locale/localeinfo.h"
#include <stdlib.h>
#include <string.h>
#include <gconv_int.h>
/* How many character should be converted in one call? */
#define GCONV_NCHAR_GOAL 8160
int
__gconv_open (struct gconv_spec *conv_spec, __gconv_t *handle,
int flags)
{
struct __gconv_step *steps;
size_t nsteps;
__gconv_t result = NULL;
size_t cnt = 0;
int res;
int conv_flags = 0;
bool translit = false;
char *tocode, *fromcode;
/* Find out whether any error handling method is specified. */
translit = conv_spec->translit;
if (conv_spec->ignore)
conv_flags |= __GCONV_IGNORE_ERRORS;
tocode = conv_spec->tocode;
fromcode = conv_spec->fromcode;
/* If the string is empty define this to mean the charset of the
currently selected locale. */
if (strcmp (tocode, "//") == 0)
{
const char *codeset = _NL_CURRENT (LC_CTYPE, CODESET);
size_t len = strlen (codeset);
char *dest;
tocode = dest = (char *) alloca (len + 3);
memcpy (__mempcpy (dest, codeset, len), "//", 3);
}
if (strcmp (fromcode, "//") == 0)
{
const char *codeset = _NL_CURRENT (LC_CTYPE, CODESET);
size_t len = strlen (codeset);
char *dest;
fromcode = dest = (char *) alloca (len + 3);
memcpy (__mempcpy (dest, codeset, len), "//", 3);
}
res = __gconv_find_transform (tocode, fromcode, &steps, &nsteps, flags);
if (res == __GCONV_OK)
{
/* Allocate room for handle. */
result = (__gconv_t) malloc (sizeof (struct __gconv_info)
+ (nsteps
* sizeof (struct __gconv_step_data)));
if (result == NULL)
res = __GCONV_NOMEM;
else
{
/* Remember the list of steps. */
result->__steps = steps;
result->__nsteps = nsteps;
/* Clear the array for the step data. */
memset (result->__data, '\0',
nsteps * sizeof (struct __gconv_step_data));
/* Call all initialization functions for the transformation
step implementations. */
for (cnt = 0; cnt < nsteps; ++cnt)
{
size_t size;
/* Would have to be done if we would not clear the whole
array above. */
#if 0
/* Reset the counter. */
result->__data[cnt].__invocation_counter = 0;
/* It's a regular use. */
result->__data[cnt].__internal_use = 0;
#endif
/* We use the `mbstate_t' member in DATA. */
result->__data[cnt].__statep = &result->__data[cnt].__state;
/* The builtin transliteration handling only
supports the internal encoding. */
if (translit
&& __strcasecmp_l (steps[cnt].__from_name,
"INTERNAL", _nl_C_locobj_ptr) == 0)
conv_flags |= __GCONV_TRANSLIT;
/* If this is the last step we must not allocate an
output buffer. */
if (cnt < nsteps - 1)
{
result->__data[cnt].__flags = conv_flags;
/* Allocate the buffer. */
size = (GCONV_NCHAR_GOAL * steps[cnt].__max_needed_to);
result->__data[cnt].__outbuf = malloc (size);
if (result->__data[cnt].__outbuf == NULL)
{
res = __GCONV_NOMEM;
goto bail;
}
result->__data[cnt].__outbufend =
result->__data[cnt].__outbuf + size;
}
else
{
/* Handle the last entry. */
result->__data[cnt].__flags = conv_flags | __GCONV_IS_LAST;
break;
}
}
}
if (res != __GCONV_OK)
{
/* Something went wrong. Free all the resources. */
int serrno;
bail:
serrno = errno;
if (result != NULL)
{
while (cnt-- > 0)
free (result->__data[cnt].__outbuf);
free (result);
result = NULL;
}
__gconv_close_transform (steps, nsteps);
__set_errno (serrno);
}
}
*handle = result;
return res;
}
libc_hidden_def (__gconv_open)
|
