confstr.c revision 100149 
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. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)confstr.c	8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/gen/confstr.c 100149 2002-07-15 22:21:33Z wollman $");
39
40#include <sys/param.h>
41
42#include <errno.h>
43#include <limits.h>
44#include <paths.h>
45#include <string.h>
46#include <unistd.h>
47
48
49size_t
50confstr(int name, char *buf, size_t len)
51{
52	const char *p;
53	const char UPE[] = "unsupported programming environment";
54
55	switch (name) {
56	case _CS_PATH:
57		p = _PATH_STDPATH;
58		goto docopy;
59
60		/*
61		 * POSIX/SUS ``Programming Environments'' stuff
62		 *
63		 * We don't support more than one programming environment
64		 * on any platform (yet), so we just return the empty
65		 * string for the environment we are compiled for,
66		 * and the string "unsupported programming environment"
67		 * for anything else.  (The Standard says that if these
68		 * values are used on a system which does not support
69		 * this environment -- determined via sysconf() -- then
70		 * the value we return is unspecified.  So, we return
71		 * something which will cause obvious breakage.)
72		 *
73		 * Note that the _V6_LP64_OFF64 is actually an *I*LP64
74		 * environment; FreeBSD's LP64 architectures use the
75		 * _V6_LPBIG_OFFBIG environment instead.
76		 */
77	case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
78	case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
79	case _CS_POSIX_V6_ILP32_OFF32_LIBS:
80	case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
81	case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
82	case _CS_POSIX_V6_LP64_OFF64_LIBS:
83		/*
84		 * These six environments are never supported.
85		 */
86		p = UPE;
87		goto docopy;
88
89	case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
90	case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
91	case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
92		if (sizeof(long) * 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_LPBIG_OFFBIG_CFLAGS:
100	case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
101	case _CS_POSIX_V6_LPBIG_OFFBIG_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		if (sizeof(long) * CHAR_BIT >= 64)
113			p = "_V6_LPBIG_OFFBIG";
114		else
115			p = "_V6_ILP32_OFFBIG";
116		goto docopy;
117
118docopy:
119		if (len != 0 && buf != NULL)
120			strlcpy(buf, p, len);
121		return (strlen(p) + 1);
122
123	default:
124		errno = EINVAL;
125		return (0);
126	}
127	/* NOTREACHED */
128}
129