1c9885518SGarrett Wollman /*
2c9885518SGarrett Wollman * Copyright 2002 Massachusetts Institute of Technology
3c9885518SGarrett Wollman *
4c9885518SGarrett Wollman * Permission to use, copy, modify, and distribute this software and
5c9885518SGarrett Wollman * its documentation for any purpose and without fee is hereby
6c9885518SGarrett Wollman * granted, provided that both the above copyright notice and this
7c9885518SGarrett Wollman * permission notice appear in all copies, that both the above
8c9885518SGarrett Wollman * copyright notice and this permission notice appear in all
9c9885518SGarrett Wollman * supporting documentation, and that the name of M.I.T. not be used
10c9885518SGarrett Wollman * in advertising or publicity pertaining to distribution of the
11c9885518SGarrett Wollman * software without specific, written prior permission. M.I.T. makes
12c9885518SGarrett Wollman * no representations about the suitability of this software for any
13c9885518SGarrett Wollman * purpose. It is provided "as is" without express or implied
14c9885518SGarrett Wollman * warranty.
15c9885518SGarrett Wollman *
16c9885518SGarrett Wollman * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17c9885518SGarrett Wollman * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18c9885518SGarrett Wollman * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19c9885518SGarrett Wollman * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20c9885518SGarrett Wollman * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21c9885518SGarrett Wollman * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22c9885518SGarrett Wollman * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23c9885518SGarrett Wollman * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24c9885518SGarrett Wollman * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25c9885518SGarrett Wollman * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26c9885518SGarrett Wollman * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27c9885518SGarrett Wollman * SUCH DAMAGE.
28c9885518SGarrett Wollman */
29c9885518SGarrett Wollman
30d0509082SJacques Vidrine /*
31d0509082SJacques Vidrine * I din't use "namespace.h" here because none of the relevant utilities
32d0509082SJacques Vidrine * are threaded, so I'm not concerned about cancellation points or other
33d0509082SJacques Vidrine * niceties.
34d0509082SJacques Vidrine */
35*53e075c0SXin LI #include <sys/limits.h>
36*53e075c0SXin LI
37c9885518SGarrett Wollman #include <limits.h>
38c9885518SGarrett Wollman #include <stdlib.h>
39c9885518SGarrett Wollman #include <string.h>
40c9885518SGarrett Wollman #include <unistd.h>
41c9885518SGarrett Wollman
42c9885518SGarrett Wollman #define _PATH_UTIL_COMPAT "/etc/compat-FreeBSD-4-util"
43c9885518SGarrett Wollman #define _ENV_UTIL_COMPAT "_COMPAT_FreeBSD_4"
44c9885518SGarrett Wollman
45c9885518SGarrett Wollman int
check_utility_compat(const char * utility)46c9885518SGarrett Wollman check_utility_compat(const char *utility)
47c9885518SGarrett Wollman {
48*53e075c0SXin LI char buf[PATH_MAX];
49c9885518SGarrett Wollman char *p, *bp;
50c9885518SGarrett Wollman int len;
51c9885518SGarrett Wollman
52c9885518SGarrett Wollman if ((p = getenv(_ENV_UTIL_COMPAT)) != NULL) {
53d0509082SJacques Vidrine strlcpy(buf, p, sizeof buf);
54c9885518SGarrett Wollman } else {
55*53e075c0SXin LI if ((len = readlink(_PATH_UTIL_COMPAT, buf, sizeof(buf) - 1)) < 0)
56c9885518SGarrett Wollman return 0;
57c9885518SGarrett Wollman buf[len] = '\0';
58c9885518SGarrett Wollman }
59c9885518SGarrett Wollman if (buf[0] == '\0')
60c9885518SGarrett Wollman return 1;
61c9885518SGarrett Wollman
62c9885518SGarrett Wollman bp = buf;
63c9885518SGarrett Wollman while ((p = strsep(&bp, ",")) != NULL) {
64c9885518SGarrett Wollman if (strcmp(p, utility) == 0)
65c9885518SGarrett Wollman return 1;
66c9885518SGarrett Wollman }
67c9885518SGarrett Wollman return 0;
68c9885518SGarrett Wollman }
69