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