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