1 /*-
2 * Copyright (c) 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)confstr.c 8.1 (Berkeley) 6/4/93";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include <sys/param.h>
37
38 #include <errno.h>
39 #include <limits.h>
40 #include <paths.h>
41 #include <string.h>
42 #include <unistd.h>
43
44
45 size_t
confstr(int name,char * buf,size_t len)46 confstr(int name, char *buf, size_t len)
47 {
48 const char *p;
49 const char UPE[] = "unsupported programming environment";
50
51 switch (name) {
52 case _CS_PATH:
53 p = _PATH_STDPATH;
54 goto docopy;
55
56 /*
57 * POSIX/SUS ``Programming Environments'' stuff
58 *
59 * We don't support more than one programming environment
60 * on any platform (yet), so we just return the empty
61 * string for the environment we are compiled for,
62 * and the string "unsupported programming environment"
63 * for anything else. (The Standard says that if these
64 * values are used on a system which does not support
65 * this environment -- determined via sysconf() -- then
66 * the value we return is unspecified. So, we return
67 * something which will cause obvious breakage.)
68 */
69 case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
70 case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
71 case _CS_POSIX_V6_ILP32_OFF32_LIBS:
72 case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
73 case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
74 case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:
75 /*
76 * These two environments are never supported.
77 */
78 p = UPE;
79 goto docopy;
80
81 case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
82 case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
83 case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
84 if (sizeof(long) * CHAR_BIT == 32 &&
85 sizeof(off_t) > sizeof(long))
86 p = "";
87 else
88 p = UPE;
89 goto docopy;
90
91 case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
92 case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
93 case _CS_POSIX_V6_LP64_OFF64_LIBS:
94 if (sizeof(long) * CHAR_BIT >= 64 &&
95 sizeof(void *) * CHAR_BIT >= 64 &&
96 sizeof(int) * CHAR_BIT >= 32 &&
97 sizeof(off_t) >= sizeof(long))
98 p = "";
99 else
100 p = UPE;
101 goto docopy;
102
103 case _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS:
104 /* XXX - should have more complete coverage */
105 if (sizeof(long) * CHAR_BIT >= 64)
106 p = "_POSIX_V6_LP64_OFF64";
107 else
108 p = "_POSIX_V6_ILP32_OFFBIG";
109 goto docopy;
110
111 docopy:
112 if (len != 0 && buf != NULL)
113 strlcpy(buf, p, len);
114 return (strlen(p) + 1);
115
116 default:
117 errno = EINVAL;
118 return (0);
119 }
120 /* NOTREACHED */
121 }
122