[BZ #2172]
[glibc.git] / posix / confstr.c
blob26b0fa875b0f3f204dea53152d2e5169a6a3e56f
1 /* Copyright (C) 1991, 1996, 1997, 2000-2002, 2003, 2004
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <stddef.h>
21 #include <errno.h>
22 #include <unistd.h>
23 #include <string.h>
24 #include <confstr.h>
25 #include "../version.h"
27 /* If BUF is not NULL and LEN > 0, fill in at most LEN - 1 bytes
28 of BUF with the value corresponding to NAME and zero-terminate BUF.
29 Return the number of bytes required to hold NAME's entire value. */
30 size_t
31 confstr (name, buf, len)
32 int name;
33 char *buf;
34 size_t len;
36 const char *string = "";
37 size_t string_len = 1;
39 switch (name)
41 case _CS_PATH:
43 static const char cs_path[] = CS_PATH;
44 string = cs_path;
45 string_len = sizeof (cs_path);
47 break;
49 case _CS_V6_WIDTH_RESTRICTED_ENVS:
50 /* We have to return a newline-separated list of named of
51 programming environements in which the widths of blksize_t,
52 cc_t, mode_t, nfds_t, pid_t, ptrdiff_t, size_t, speed_t,
53 ssize_t, suseconds_t, tcflag_t, useconds_t, wchar_t, and
54 wint_t types are no greater than the width of type long.
56 Currently this means all environment which the system allows. */
58 char restenvs[4 * sizeof "POSIX_V6_LPBIG_OFFBIG"];
60 string_len = 0;
61 #ifndef _POSIX_V6_ILP32_OFF32
62 if (__sysconf (_SC_V6_ILP32_OFF32) > 0)
63 #endif
64 #if !defined _POSIX_V6_ILP32_OFF32 || _POSIX_V6_ILP32_OFF32 > 0
66 memcpy (restenvs + string_len, "POSIX_V6_ILP32_OFF32",
67 sizeof "POSIX_V6_ILP32_OFF32" - 1);
68 string_len += sizeof "POSIX_V6_ILP32_OFF32" - 1;
70 #endif
71 #ifndef _POSIX_V6_ILP32_OFFBIG
72 if (__sysconf (_SC_V6_ILP32_OFFBIG) > 0)
73 #endif
74 #if !defined _POSIX_V6_ILP32_OFFBIG || _POSIX_V6_ILP32_OFFBIG > 0
76 if (string_len)
77 restenvs[string_len++] = '\n';
78 memcpy (restenvs + string_len, "POSIX_V6_ILP32_OFFBIG",
79 sizeof "POSIX_V6_ILP32_OFFBIG" - 1);
80 string_len += sizeof "POSIX_V6_ILP32_OFFBIG" - 1;
82 #endif
83 #ifndef _POSIX_V6_LP64_OFF64
84 if (__sysconf (_SC_V6_LP64_OFF64) > 0)
85 #endif
86 #if !defined _POSIX_V6_LP64_OFF64 || _POSIX_V6_LP64_OFF64 > 0
88 if (string_len)
89 restenvs[string_len++] = '\n';
90 memcpy (restenvs + string_len, "POSIX_V6_LP64_OFF64",
91 sizeof "POSIX_V6_LP64_OFF64" - 1);
92 string_len += sizeof "POSIX_V6_LP64_OFF64" - 1;
94 #endif
95 #ifndef _POSIX_V6_LPBIG_OFFBIG
96 if (__sysconf (_SC_V6_LPBIG_OFFBIG) > 0)
97 #endif
98 #if !defined _POSIX_V6_LPBIG_OFFBIG || _POSIX_V6_LPBIG_OFFBIG > 0
100 if (string_len)
101 restenvs[string_len++] = '\n';
102 memcpy (restenvs + string_len, "POSIX_V6_LPBIG_OFFBIG",
103 sizeof "POSIX_V6_LPBIG_OFFBIG" - 1);
104 string_len += sizeof "POSIX_V6_LPBIG_OFFBIG" - 1;
106 #endif
107 restenvs[string_len++] = '\0';
108 string = restenvs;
110 break;
112 case _CS_XBS5_ILP32_OFF32_CFLAGS:
113 case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
114 #ifdef __ILP32_OFF32_CFLAGS
115 # if _POSIX_V6_ILP32_OFF32 == -1
116 # error "__ILP32_OFF32_CFLAGS should not be defined"
117 # elif !defined _POSIX_V6_ILP32_OFF32
118 if (__sysconf (_SC_V6_ILP32_OFF32) < 0)
119 break;
120 # endif
121 string = __ILP32_OFF32_CFLAGS;
122 string_len = sizeof (__ILP32_OFF32_CFLAGS);
123 #endif
124 break;
126 case _CS_XBS5_ILP32_OFFBIG_CFLAGS:
127 case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
128 #ifdef __ILP32_OFFBIG_CFLAGS
129 # if _POSIX_V6_ILP32_OFFBIG == -1
130 # error "__ILP32_OFFBIG_CFLAGS should not be defined"
131 # elif !defined _POSIX_V6_ILP32_OFFBIG
132 if (__sysconf (_SC_V6_ILP32_OFFBIG) < 0)
133 break;
134 # endif
135 string = __ILP32_OFFBIG_CFLAGS;
136 string_len = sizeof (__ILP32_OFFBIG_CFLAGS);
137 #endif
138 break;
140 case _CS_XBS5_LP64_OFF64_CFLAGS:
141 case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
142 #ifdef __LP64_OFF64_CFLAGS
143 # if _POSIX_V6_LP64_OFF64 == -1
144 # error "__LP64_OFF64_CFLAGS should not be defined"
145 # elif !defined _POSIX_V6_LP64_OFF64
146 if (__sysconf (_SC_V6_LP64_OFF64) < 0)
147 break;
148 # endif
149 string = __LP64_OFF64_CFLAGS;
150 string_len = sizeof (__LP64_OFF64_CFLAGS);
151 #endif
152 break;
154 case _CS_XBS5_ILP32_OFF32_LDFLAGS:
155 case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
156 #ifdef __ILP32_OFF32_LDFLAGS
157 # if _POSIX_V6_ILP32_OFF32 == -1
158 # error "__ILP32_OFF32_LDFLAGS should not be defined"
159 # elif !defined _POSIX_V6_ILP32_OFF32
160 if (__sysconf (_SC_V6_ILP32_OFF32) < 0)
161 break;
162 # endif
163 string = __ILP32_OFF32_LDFLAGS;
164 string_len = sizeof (__ILP32_OFF32_LDFLAGS);
165 #endif
166 break;
168 case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:
169 case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
170 #ifdef __ILP32_OFFBIG_LDFLAGS
171 # if _POSIX_V6_ILP32_OFFBIG == -1
172 # error "__ILP32_OFFBIG_LDFLAGS should not be defined"
173 # elif !defined _POSIX_V6_ILP32_OFFBIG
174 if (__sysconf (_SC_V6_ILP32_OFFBIG) < 0)
175 break;
176 # endif
177 string = __ILP32_OFFBIG_LDFLAGS;
178 string_len = sizeof (__ILP32_OFFBIG_LDFLAGS);
179 #endif
180 break;
182 case _CS_XBS5_LP64_OFF64_LDFLAGS:
183 case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
184 #ifdef __LP64_OFF64_LDFLAGS
185 # if _POSIX_V6_LP64_OFF64 == -1
186 # error "__LP64_OFF64_LDFLAGS should not be defined"
187 # elif !defined _POSIX_V6_LP64_OFF64
188 if (__sysconf (_SC_V6_LP64_OFF64) < 0)
189 break;
190 # endif
191 string = __LP64_OFF64_LDFLAGS;
192 string_len = sizeof (__LP64_OFF64_LDFLAGS);
193 #endif
194 break;
196 case _CS_LFS_CFLAGS:
197 case _CS_LFS_LINTFLAGS:
198 #if _POSIX_V6_ILP32_OFF32 == 1 && _POSIX_V6_ILP32_OFFBIG == 1
199 # define __LFS_CFLAGS "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
200 /* Signal that we want the new ABI. */
201 string = __LFS_CFLAGS;
202 string_len = sizeof (__LFS_CFLAGS);
203 #endif
204 break;
206 case _CS_LFS_LDFLAGS:
207 case _CS_LFS_LIBS:
208 /* No special libraries or linker flags needed. */
209 break;
211 case _CS_LFS64_CFLAGS:
212 case _CS_LFS64_LINTFLAGS:
213 #define __LFS64_CFLAGS "-D_LARGEFILE64_SOURCE"
214 string = __LFS64_CFLAGS;
215 string_len = sizeof (__LFS64_CFLAGS);
216 break;
218 case _CS_LFS64_LDFLAGS:
219 case _CS_LFS64_LIBS:
220 /* No special libraries or linker flags needed. */
221 break;
223 case _CS_XBS5_ILP32_OFF32_LIBS:
224 case _CS_XBS5_ILP32_OFF32_LINTFLAGS:
225 case _CS_XBS5_ILP32_OFFBIG_LIBS:
226 case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:
227 case _CS_XBS5_LP64_OFF64_LIBS:
228 case _CS_XBS5_LP64_OFF64_LINTFLAGS:
229 case _CS_XBS5_LPBIG_OFFBIG_CFLAGS:
230 case _CS_XBS5_LPBIG_OFFBIG_LDFLAGS:
231 case _CS_XBS5_LPBIG_OFFBIG_LIBS:
232 case _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS:
234 case _CS_POSIX_V6_ILP32_OFF32_LIBS:
235 case _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS:
236 case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
237 case _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS:
238 case _CS_POSIX_V6_LP64_OFF64_LIBS:
239 case _CS_POSIX_V6_LP64_OFF64_LINTFLAGS:
240 case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
241 case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
242 case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:
243 case _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS:
244 /* GNU libc does not require special actions to use LFS functions. */
245 break;
247 case _CS_GNU_LIBC_VERSION:
248 string = "glibc " VERSION;
249 string_len = sizeof ("glibc " VERSION);
250 break;
252 case _CS_GNU_LIBPTHREAD_VERSION:
253 #ifdef LIBPTHREAD_VERSION
254 string = LIBPTHREAD_VERSION;
255 string_len = sizeof LIBPTHREAD_VERSION;
256 break;
257 #else
258 /* No thread library. */
259 __set_errno (EINVAL);
260 return 0;
261 #endif
263 default:
264 __set_errno (EINVAL);
265 return 0;
268 if (len > 0 && buf != NULL)
270 if (string_len <= len)
271 memcpy (buf, string, string_len);
272 else
274 memcpy (buf, string, len - 1);
275 buf[len - 1] = '\0';
278 return string_len;
280 libc_hidden_def (confstr)