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 * 3. 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 * @(#)confstr.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/lib/libc/gen/confstr.c,v 1.10 2007/01/09 00:27:53 imp Exp $
31 */
32
33 #include <sys/param.h>
34
35 #include <errno.h>
36 #include <limits.h>
37 #include <paths.h>
38 #include <string.h>
39 #include <unistd.h>
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 case _CS_POSIX_V7_ILP32_OFF32_CFLAGS:
72 case _CS_POSIX_V7_ILP32_OFF32_LDFLAGS:
73 case _CS_POSIX_V7_ILP32_OFF32_LIBS:
74 case _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS:
75 case _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS:
76 case _CS_POSIX_V7_LPBIG_OFFBIG_LIBS:
77 /*
78 * These two environments are never supported.
79 */
80 p = UPE;
81 goto docopy;
82
83 case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
84 case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
85 case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
86 case _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS:
87 case _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS:
88 case _CS_POSIX_V7_ILP32_OFFBIG_LIBS:
89 if (sizeof(long) * CHAR_BIT == 32 &&
90 sizeof(off_t) > sizeof(long))
91 p = "";
92 else
93 p = UPE;
94 goto docopy;
95
96 case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
97 case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
98 case _CS_POSIX_V6_LP64_OFF64_LIBS:
99 case _CS_POSIX_V7_LP64_OFF64_CFLAGS:
100 case _CS_POSIX_V7_LP64_OFF64_LDFLAGS:
101 case _CS_POSIX_V7_LP64_OFF64_LIBS:
102 if (sizeof(long) * CHAR_BIT >= 64 &&
103 sizeof(void *) * CHAR_BIT >= 64 &&
104 sizeof(int) * CHAR_BIT >= 32 &&
105 sizeof(off_t) >= sizeof(long))
106 p = "";
107 else
108 p = UPE;
109 goto docopy;
110
111 case _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS:
112 /* XXX - should have more complete coverage */
113 if (sizeof(long) * CHAR_BIT >= 64)
114 p = "_POSIX_V6_LP64_OFF64";
115 else
116 p = "_POSIX_V6_ILP32_OFFBIG";
117 goto docopy;
118
119 case _CS_POSIX_V7_WIDTH_RESTRICTED_ENVS:
120 /* XXX - should have more complete coverage */
121 if (sizeof(long) * CHAR_BIT >= 64)
122 p = "_POSIX_V7_LP64_OFF64";
123 else
124 p = "_POSIX_V7_ILP32_OFFBIG";
125 goto docopy;
126
127 case _CS_V6_ENV:
128 case _CS_V7_ENV:
129 p = "";
130 goto docopy;
131
132 docopy:
133 if (len != 0 && buf != NULL)
134 strlcpy(buf, p, len);
135 return (strlen(p) + 1);
136
137 default:
138 errno = EINVAL;
139 return (0);
140 }
141 /* NOTREACHED */
142 }
143