98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
/*-
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* Copyright (c) 2002 Dag-Erling Coïdan Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "pathnames.h"
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extern char **environ;
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int
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main(int argc __unused, char *argv[])
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{
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char path[PATH_MAX], *cp;
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const char *cmd, *p, *q, *self;
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size_t len;
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struct stat self_stat, perl_stat;
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self = argv[0];
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if (stat (self, &self_stat) != 0) {
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self_stat.st_dev = makedev (0, 0);
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self_stat.st_ino = 0;
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}
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if ((cmd = strrchr(self, '/')) == NULL)
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cmd = self;
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else
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cmd++;
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/* If null path (e. g. in mailfilter scripts), use default path. */
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if ((p = getenv("PATH")) == NULL) {
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if (sysctlbyname("user.cs_path", (void *)NULL, &len,
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(void *)NULL, 0) == -1)
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err(1, "sysctlbyname(\"user.cs_path\")");
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if ((cp = malloc(len + 1)) == NULL)
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err(1, "malloc() failed");
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if (sysctlbyname("user.cs_path", cp, &len, (void *)NULL, 0) == -1)
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err(1, "sysctlbyname(\"user.cs_path\")");
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setenv("PATH", cp, 1);
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}
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/* If default package bindir not there, append it. */
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p = getenv("PATH");
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if (strstr(p, PATH_PKG_BINDIR) == NULL) {
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snprintf(path, sizeof path, "%s:%s", p, PATH_PKG_BINDIR);
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setenv("PATH", path, 1);
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}
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argv[0] = path;
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for (p = q = getenv("PATH"); p && *p && *q; p = q + 1) {
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for (q = p; *q && *q != ':'; ++q)
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/* nothing */ ;
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len = snprintf(path, sizeof path, "%.*s/%s", (int)(q - p), p, cmd);
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if (len >= PATH_MAX || strcmp(path, self) == 0)
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continue;
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if (stat (path, &perl_stat) == 0
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&& self_stat.st_dev == perl_stat.st_dev
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&& self_stat.st_ino == perl_stat.st_ino)
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continue;
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execve(path, argv, environ);
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if (errno != ENOENT)
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err(1, "%s", path);
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}
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errx(1, "Perl is not installed, try 'pkg_add -r perl'");
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}
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