forked from osmocom/wireshark
350 lines
7.8 KiB
C
350 lines
7.8 KiB
C
/* filesystem.c
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* Filesystem utility routines
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*
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* $Id: filesystem.c,v 1.6 2001/08/21 08:16:54 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <glib.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_WINDOWS_H
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#include <windows.h>
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#endif
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#ifndef WIN32
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#include <pwd.h>
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#endif
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#include "filesystem.h"
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/*
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* Given a pathname, return a pointer to the last pathname separator
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* character in the pathname, or NULL if the pathname contains no
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* separators.
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*/
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char *
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find_last_pathname_separator(char *path)
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{
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char *separator;
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#ifdef WIN32
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char c;
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/*
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* We have to scan for '\' or '/'.
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* Get to the end of the string.
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*/
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separator = path + strlen(path); /* points to ending '\0' */
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while (separator > path) {
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c = *--separator;
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if (c == '\\' || c == '/')
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return separator; /* found it */
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}
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/*
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* OK, we didn't find any, so no directories - but there might
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* be a drive letter....
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*/
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return strchr(path, ':');
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#else
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separator = strrchr(path, '/');
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#endif
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return separator;
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}
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/*
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* Given a pathname, return the last component.
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*/
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char *
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get_basename(char *path)
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{
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char *filename;
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filename = find_last_pathname_separator(path);
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if (filename == NULL) {
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/*
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* There're no directories, drive letters, etc. in the
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* name; the pathname *is* the file name.
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*/
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filename = path;
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} else {
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/*
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* Skip past the pathname or drive letter separator.
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*/
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filename++;
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}
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return filename;
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}
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/*
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* Given a pathname, return a string containing everything but the
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* last component. NOTE: this overwrites the pathname handed into
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* it....
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*/
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char *
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get_dirname(char *path)
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{
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char *separator;
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separator = find_last_pathname_separator(path);
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if (separator == NULL) {
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/*
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* There're no directories, drive letters, etc. in the
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* name; there is no directory path to return.
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*/
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return NULL;
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}
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/*
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* Get rid of the last pathname separator and the final file
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* name following it.
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*/
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*separator = '\0';
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/*
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* "path" now contains the pathname of the directory containing
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* the file/directory to which it referred.
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*/
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return path;
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}
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/*
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* Given a pathname, return:
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*
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* the errno, if an attempt to "stat()" the file fails;
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*
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* EISDIR, if the attempt succeeded and the file turned out
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* to be a directory;
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*
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* 0, if the attempt succeeded and the file turned out not
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* to be a directory.
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*/
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/*
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* Visual C++ on Win32 systems doesn't define these. (Old UNIX systems don't
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* define them either.)
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*
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* Visual C++ on Win32 systems doesn't define S_IFIFO, it defines _S_IFIFO.
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*/
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#ifndef S_ISREG
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#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
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#endif
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#ifndef S_IFIFO
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#define S_IFIFO _S_IFIFO
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#endif
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#ifndef S_ISFIFO
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#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
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#endif
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#ifndef S_ISDIR
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#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
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#endif
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int
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test_for_directory(const char *path)
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{
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struct stat statb;
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if (stat(path, &statb) < 0)
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return errno;
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if (S_ISDIR(statb.st_mode))
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return EISDIR;
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else
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return 0;
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}
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/*
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* Get the directory in which global configuration and data files are
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* stored.
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*/
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const char *
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get_datafile_dir(void)
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{
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#ifdef WIN32
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char prog_pathname[_MAX_PATH+2];
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char *dir_end;
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size_t datafile_dir_len;
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static char *datafile_dir;
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/*
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* Have we already gotten the pathname?
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* If so, just return it.
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*/
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if (datafile_dir != NULL)
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return datafile_dir;
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/*
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* No, we haven't.
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* Start out by assuming it's the default installation directory.
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*/
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datafile_dir = "C:\\Program Files\\Ethereal\\";
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/*
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* Now we attempt to get the full pathname of the currently running
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* program, under the assumption that we're running an installed
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* version of the program. If we fail, we don't change "datafile_dir",
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* and thus end up using DATAFILE_DIR.
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*
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* XXX - does NSIS put the installation directory into
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* "\HKEY_LOCAL_MACHINE\SOFTWARE\Ethereal\InstallDir"?
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* If so, perhaps we should read that from the registry,
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* instead.
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*/
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if (GetModuleFileName(NULL, prog_pathname, sizeof prog_pathname) != 0) {
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/*
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* If the program is an installed version, the full pathname
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* includes the pathname of the directory in which it was
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* installed; get that directory's pathname, and construct
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* from it the pathname of the directory in which the
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* plugins were installed.
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*
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* First, find the last "\\" in the directory, as that
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* marks the end of the directory pathname.
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*
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* XXX - Can the pathname be something such as
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* "C:ethereal.exe"? Or is it always a full pathname
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* beginning with "\\" after the drive letter?
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*/
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dir_end = strrchr(prog_pathname, '\\');
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if (dir_end != NULL) {
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/*
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* Found it - now figure out how long the datafile
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* directory pathname will be.
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*/
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datafile_dir_len = (dir_end - prog_pathname);
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/*
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* Allocate a buffer for the plugin directory
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* pathname, and construct it.
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*/
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datafile_dir = g_malloc(datafile_dir_len + 1);
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strncpy(datafile_dir, prog_pathname, datafile_dir_len);
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datafile_dir[datafile_dir_len] = '\0';
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}
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}
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return datafile_dir;
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#else
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/*
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* Just use DATAFILE_DIR, as that's what the configure script
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* set it to be.
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*/
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return DATAFILE_DIR;
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#endif
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}
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/* Returns the user's home directory, via the HOME environment
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* variable, or a default directory if HOME is not set */
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const char*
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get_home_dir(void)
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{
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static const char *home = NULL;
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#ifdef WIN32
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char *homedrive, *homepath;
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char *homestring;
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char *lastsep;
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#else
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struct passwd *pwd;
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#endif
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/* Return the cached value, if available */
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if (home)
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return home;
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#ifdef WIN32
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/*
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* XXX - should we use USERPROFILE anywhere in this process?
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* Is there a chance that it might be set but one or more of
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* HOMEDRIVE or HOMEPATH isn't set?
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*/
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homedrive = getenv("HOMEDRIVE");
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if (homedrive != NULL) {
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homepath = getenv("HOMEPATH");
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if (homepath != NULL) {
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/*
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* This is cached, so we don't need to worry about
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* allocating multiple ones of them.
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*/
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homestring =
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g_malloc(strlen(homedrive) + strlen(homepath) + 1);
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strcpy(homestring, homedrive);
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strcat(homestring, homepath);
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/*
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* Trim off any trailing slash or backslash.
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*/
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lastsep = find_last_pathname_separator(homestring);
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if (lastsep != NULL && *(lastsep + 1) == '\0') {
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/*
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* Last separator is the last character
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* in the string. Nuke it.
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*/
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*lastsep = '\0';
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}
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home = homestring;
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} else
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home = homedrive;
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} else {
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/*
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* Try using "windir?
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*/
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home = "C:";
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}
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#else
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home = getenv("HOME");
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if (home == NULL) {
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/*
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* Get their home directory from the password file.
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* If we can't even find a password file entry for them,
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* use "/tmp".
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*/
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pwd = getpwuid(getuid());
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if (pwd != NULL) {
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/*
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* This is cached, so we don't need to worry
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* about allocating multiple ones of them.
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*/
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home = g_strdup(pwd->pw_dir);
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} else
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home = "/tmp";
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}
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#endif
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return home;
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}
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