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
41size_t
42confstr(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
107docopy:
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