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[glibc.git] / posix / confstr.c
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1 /* Copyright (C) 1991, 1996, 1997, 2000, 2001 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #include <stddef.h>
20 #include <errno.h>
21 #include <unistd.h>
22 #include <string.h>
23 #include <confstr.h>
25 /* If BUF is not NULL and LEN > 0, fill in at most LEN - 1 bytes
26 of BUF with the value corresponding to NAME and zero-terminate BUF.
27 Return the number of bytes required to hold NAME's entire value. */
28 size_t
29 confstr (name, buf, len)
30 int name;
31 char *buf;
32 size_t len;
34 const char *string;
35 size_t string_len;
37 switch (name)
39 case _CS_PATH:
41 static const char cs_path[] = CS_PATH;
42 string = cs_path;
43 string_len = sizeof (cs_path);
45 break;
47 case _CS_V6_WIDTH_RESTRICTED_ENVS:
48 /* We have to return a newline-separated list of named of
49 programming environements in which the widths of blksize_t,
50 cc_t, mode_t, nfds_t, pid_t, ptrdiff_t, size_t, speed_t,
51 ssize_t, suseconds_t, tcflag_t, useconds_t, wchar_t, and
52 wint_t types are no greater than the width of type long.
54 Currently this means all environment which the system allows. */
56 static const char restenvs[] =
57 #if _POSIX_V6_ILP32_OFF32 > 0
58 "_POSIX_V6_ILP32_OFF32"
59 #endif
60 #if _POSIX_V6_ILP32_OFFBIG > 0
61 # if _POSIX_V6_ILP32_OFF32 > 0
62 "\n"
63 # endif
64 "_POSIX_V6_ILP32_OFFBIG"
65 #endif
66 #if _POSIX_V6_LP64_OFF64 > 0
67 # if _POSIX_V6_ILP32_OFF32 > 0 || _POSIX_V6_ILP32_OFFBIG > 0
68 "\n"
69 # endif
70 "_POSIX_V6_LP64_OFF64"
71 #endif
72 #if _POSIX_V6_LPBIG_OFFBIG > 0
73 # if _POSIX_V6_ILP32_OFF32 > 0 || _POSIX_V6_ILP32_OFFBIG > 0 \
74 || _POSIX_V6_LP64_OFF64 > 0
75 "\n"
76 # endif
77 "_POSIX_V6_LPBIG_OFFBIG"
78 #endif
80 string = restenvs;
81 string_len = sizeof (restenvs);
83 break;
85 case _CS_XBS5_ILP32_OFFBIG_CFLAGS:
86 case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
87 case _CS_LFS_CFLAGS:
88 #if _XBS5_LP64_OFF64 == -1 && _XBS5_LPBIG_OFFBIG == -1 && _XBS5_ILP32_OFFBIG == 1
89 /* Signal that we want the new ABI. */
91 static const char file_offset[] = "-D_FILE_OFFSET_BITS=64";
92 string = file_offset;
93 string_len = sizeof (file_offset);
95 break;
96 #endif
97 /* FALLTHROUGH */
99 case _CS_LFS_LINTFLAGS:
100 case _CS_LFS_LDFLAGS:
101 case _CS_LFS_LIBS:
102 case _CS_LFS64_CFLAGS:
103 case _CS_LFS64_LINTFLAGS:
104 case _CS_LFS64_LDFLAGS:
105 case _CS_LFS64_LIBS:
107 case _CS_XBS5_ILP32_OFF32_CFLAGS:
108 case _CS_XBS5_ILP32_OFF32_LDFLAGS:
109 case _CS_XBS5_ILP32_OFF32_LIBS:
110 case _CS_XBS5_ILP32_OFF32_LINTFLAGS:
111 case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:
112 case _CS_XBS5_ILP32_OFFBIG_LIBS:
113 case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:
114 case _CS_XBS5_LP64_OFF64_CFLAGS:
115 case _CS_XBS5_LP64_OFF64_LDFLAGS:
116 case _CS_XBS5_LP64_OFF64_LIBS:
117 case _CS_XBS5_LP64_OFF64_LINTFLAGS:
118 case _CS_XBS5_LPBIG_OFFBIG_CFLAGS:
119 case _CS_XBS5_LPBIG_OFFBIG_LDFLAGS:
120 case _CS_XBS5_LPBIG_OFFBIG_LIBS:
121 case _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS:
123 case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
124 case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
125 case _CS_POSIX_V6_ILP32_OFF32_LIBS:
126 case _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS:
127 case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
128 case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
129 case _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS:
130 case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
131 case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
132 case _CS_POSIX_V6_LP64_OFF64_LIBS:
133 case _CS_POSIX_V6_LP64_OFF64_LINTFLAGS:
134 case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
135 case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
136 case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:
137 case _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS:
138 /* GNU libc does not require special actions to use LFS functions. */
139 string = "";
140 string_len = 1;
141 break;
143 default:
144 __set_errno (EINVAL);
145 return 0;
148 if (len > 0 && buf != NULL)
150 if (string_len <= len)
151 memcpy (buf, string, string_len);
152 else
154 memcpy (buf, string, len - 1);
155 buf[len - 1] = '\0';
158 return string_len;