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/cdefs.h>
33__SCCSID("@(#)confstr.c	8.1 (Berkeley) 6/4/93");
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
45size_t
46confstr(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
111docopy:
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