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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
|
/* Copyright (C) 1991-2015 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
<http://www.gnu.org/licenses/>. */
#include <stddef.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <confstr.h>
#include "../version.h"
#define NEED_SPEC_ARRAY 0
#include <posix-conf-vars.h>
/* If BUF is not NULL and LEN > 0, fill in at most LEN - 1 bytes
of BUF with the value corresponding to NAME and zero-terminate BUF.
Return the number of bytes required to hold NAME's entire value. */
size_t
confstr (name, buf, len)
int name;
char *buf;
size_t len;
{
const char *string = "";
size_t string_len = 1;
/* Note that this buffer must be large enough for the longest strings
used below. */
char restenvs[4 * sizeof "POSIX_V7_LPBIG_OFFBIG"];
switch (name)
{
case _CS_PATH:
{
static const char cs_path[] = CS_PATH;
string = cs_path;
string_len = sizeof (cs_path);
}
break;
/* For _CS_V7_WIDTH_RESTRICTED_ENVS, _CS_V6_WIDTH_RESTRICTED_ENVS
and _CS_V5_WIDTH_RESTRICTED_ENVS:
We have to return a newline-separated list of names of
programming environments in which the widths of blksize_t,
cc_t, mode_t, nfds_t, pid_t, ptrdiff_t, size_t, speed_t,
ssize_t, suseconds_t, tcflag_t, useconds_t, wchar_t, and
wint_t types are no greater than the width of type long.
Currently this means all environments that the system allows. */
#define START_ENV_GROUP(VERSION) \
case _CS_##VERSION##_WIDTH_RESTRICTED_ENVS: \
string_len = 0;
#define END_ENV_GROUP(VERSION) \
restenvs[string_len++] = '\0'; \
string = restenvs; \
break;
#define KNOWN_ABSENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
/* Empty. */
#define KNOWN_PRESENT_ENV_STRING(STR) \
if (string_len > 0) \
restenvs[string_len++] = '\n'; \
memcpy (restenvs + string_len, STR, \
sizeof STR - 1); \
string_len += sizeof STR - 1;
#define KNOWN_PRESENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
KNOWN_PRESENT_ENV_STRING (#ENV_PREFIX "_" #SUFFIX)
#define UNKNOWN_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
if (__sysconf (_SC_##SC_PREFIX##_##SUFFIX) > 0) \
{ \
KNOWN_PRESENT_ENVIRONMENT (SC_PREFIX, ENV_PREFIX, SUFFIX) \
}
#include "posix-envs.def"
#undef START_ENV_GROUP
#undef END_ENV_GROUP
#undef KNOWN_ABSENT_ENVIRONMENT
#undef KNOWN_PRESENT_ENV_STRING
#undef KNOWN_PRESENT_ENVIRONMENT
#undef UNKNOWN_ENVIRONMENT
case _CS_XBS5_ILP32_OFF32_CFLAGS:
case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
case _CS_POSIX_V7_ILP32_OFF32_CFLAGS:
#ifdef __ILP32_OFF32_CFLAGS
# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32)
# error "__ILP32_OFF32_CFLAGS should not be defined"
# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
break;
# endif
string = __ILP32_OFF32_CFLAGS;
string_len = sizeof (__ILP32_OFF32_CFLAGS);
#endif
break;
case _CS_XBS5_ILP32_OFFBIG_CFLAGS:
case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
case _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS:
#ifdef __ILP32_OFFBIG_CFLAGS
# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
# error "__ILP32_OFFBIG_CFLAGS should not be defined"
# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
break;
# endif
string = __ILP32_OFFBIG_CFLAGS;
string_len = sizeof (__ILP32_OFFBIG_CFLAGS);
#endif
break;
case _CS_XBS5_LP64_OFF64_CFLAGS:
case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
case _CS_POSIX_V7_LP64_OFF64_CFLAGS:
#ifdef __LP64_OFF64_CFLAGS
# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
# error "__LP64_OFF64_CFLAGS should not be defined"
# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
if (__sysconf (_SC_V7_LP64_OFF64) < 0)
break;
# endif
string = __LP64_OFF64_CFLAGS;
string_len = sizeof (__LP64_OFF64_CFLAGS);
#endif
break;
case _CS_XBS5_ILP32_OFF32_LDFLAGS:
case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
case _CS_POSIX_V7_ILP32_OFF32_LDFLAGS:
#ifdef __ILP32_OFF32_LDFLAGS
# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32 )
# error "__ILP32_OFF32_LDFLAGS should not be defined"
# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
break;
# endif
string = __ILP32_OFF32_LDFLAGS;
string_len = sizeof (__ILP32_OFF32_LDFLAGS);
#endif
break;
case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:
case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
case _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS:
#ifdef __ILP32_OFFBIG_LDFLAGS
# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
# error "__ILP32_OFFBIG_LDFLAGS should not be defined"
# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
break;
# endif
string = __ILP32_OFFBIG_LDFLAGS;
string_len = sizeof (__ILP32_OFFBIG_LDFLAGS);
#endif
break;
case _CS_XBS5_LP64_OFF64_LDFLAGS:
case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
case _CS_POSIX_V7_LP64_OFF64_LDFLAGS:
#ifdef __LP64_OFF64_LDFLAGS
# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
# error "__LP64_OFF64_LDFLAGS should not be defined"
# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
if (__sysconf (_SC_V7_LP64_OFF64) < 0)
break;
# endif
string = __LP64_OFF64_LDFLAGS;
string_len = sizeof (__LP64_OFF64_LDFLAGS);
#endif
break;
case _CS_LFS_CFLAGS:
case _CS_LFS_LINTFLAGS:
#if (CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFF32) \
&& CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFFBIG))
# define __LFS_CFLAGS "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
/* Signal that we want the new ABI. */
string = __LFS_CFLAGS;
string_len = sizeof (__LFS_CFLAGS);
#endif
break;
case _CS_LFS_LDFLAGS:
case _CS_LFS_LIBS:
/* No special libraries or linker flags needed. */
break;
case _CS_LFS64_CFLAGS:
case _CS_LFS64_LINTFLAGS:
#define __LFS64_CFLAGS "-D_LARGEFILE64_SOURCE"
string = __LFS64_CFLAGS;
string_len = sizeof (__LFS64_CFLAGS);
break;
case _CS_LFS64_LDFLAGS:
case _CS_LFS64_LIBS:
/* No special libraries or linker flags needed. */
break;
case _CS_XBS5_ILP32_OFF32_LIBS:
case _CS_XBS5_ILP32_OFF32_LINTFLAGS:
case _CS_XBS5_ILP32_OFFBIG_LIBS:
case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:
case _CS_XBS5_LP64_OFF64_LIBS:
case _CS_XBS5_LP64_OFF64_LINTFLAGS:
case _CS_XBS5_LPBIG_OFFBIG_CFLAGS:
case _CS_XBS5_LPBIG_OFFBIG_LDFLAGS:
case _CS_XBS5_LPBIG_OFFBIG_LIBS:
case _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS:
case _CS_POSIX_V6_ILP32_OFF32_LIBS:
case _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS:
case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
case _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS:
case _CS_POSIX_V6_LP64_OFF64_LIBS:
case _CS_POSIX_V6_LP64_OFF64_LINTFLAGS:
case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:
case _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS:
case _CS_POSIX_V7_ILP32_OFF32_LIBS:
case _CS_POSIX_V7_ILP32_OFF32_LINTFLAGS:
case _CS_POSIX_V7_ILP32_OFFBIG_LIBS:
case _CS_POSIX_V7_ILP32_OFFBIG_LINTFLAGS:
case _CS_POSIX_V7_LP64_OFF64_LIBS:
case _CS_POSIX_V7_LP64_OFF64_LINTFLAGS:
case _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS:
case _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS:
case _CS_POSIX_V7_LPBIG_OFFBIG_LIBS:
case _CS_POSIX_V7_LPBIG_OFFBIG_LINTFLAGS:
/* GNU libc does not require special actions to use LFS functions. */
break;
case _CS_GNU_LIBC_VERSION:
string = "glibc " VERSION;
string_len = sizeof ("glibc " VERSION);
break;
case _CS_GNU_LIBPTHREAD_VERSION:
#ifdef LIBPTHREAD_VERSION
string = LIBPTHREAD_VERSION;
string_len = sizeof LIBPTHREAD_VERSION;
break;
#else
/* No thread library. */
__set_errno (EINVAL);
return 0;
#endif
case _CS_V6_ENV:
case _CS_V7_ENV:
/* Maybe something else is needed in future. */
string = "POSIXLY_CORRECT=1";
string_len = sizeof ("POSIXLY_CORRECT=1");
break;
default:
__set_errno (EINVAL);
return 0;
}
if (len > 0 && buf != NULL)
{
if (string_len <= len)
memcpy (buf, string, string_len);
else
{
memcpy (buf, string, len - 1);
buf[len - 1] = '\0';
}
}
return string_len;
}
libc_hidden_def (confstr)
|
