forked from osmocom/wireshark
dc223932b8
svn path=/trunk/; revision=14063
807 lines
20 KiB
C
807 lines
20 KiB
C
/* filesystem.c
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* Filesystem utility routines
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*
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* $Id$
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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 <stdio.h>
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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_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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#ifdef HAVE_DIRECT_H
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#include <direct.h> /* to declare "mkdir()" on Windows */
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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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static char *
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find_last_pathname_separator(const 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 = strchr(path, '\0'); /* 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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const char *
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get_basename(const char *path)
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{
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const char *filename;
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g_assert(path != NULL);
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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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g_assert(path != NULL);
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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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int
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test_for_fifo(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_ISFIFO(statb.st_mode))
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return ESPIPE;
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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 Ethereal's global configuration and data
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* files are stored.
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*
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* XXX - if we ever make libethereal a real library, used by multiple
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* applications (more than just Tethereal and versions of Ethereal with
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* various UIs), should the configuration files belong to the library
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* (and be shared by all those applications) or to the applications?
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*
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* If they belong to the library, that could be done on UNIX by the
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* configure script, but it's trickier on Windows, as you can't just
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* use the pathname of the executable.
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*
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* If they belong to the application, that could be done on Windows
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* by using the pathname of the executable, but we'd have to have it
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* passed in as an argument, in some call, on UNIX.
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*
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* Note that some of those configuration files might be used by code in
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* libethereal, some of them might be used by dissectors (would they
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* belong to libethereal, the application, or a separate library?),
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* and some of them might be used by other code (the Ethereal preferences
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* file includes resolver preferences that control the behavior of code
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* in libethereal, dissector preferences, and UI preferences, for
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* example).
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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 the default.
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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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/*
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* Get the directory in which files that, at least on UNIX, are
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* system files (such as "/etc/ethers") are stored; on Windows,
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* there's no "/etc" directory, so we get them from the Ethereal
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* global configuration and data file directory.
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*/
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const char *
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get_systemfile_dir(void)
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{
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#ifdef _WIN32
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return get_datafile_dir();
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#else
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return "/etc";
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#endif
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}
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/*
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* Name of directory, under the user's home directory, in which
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* personal configuration files are stored.
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*/
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#ifdef _WIN32
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#define PF_DIR "Ethereal"
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#else
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/*
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* XXX - should this be ".libepan"? For backwards-compatibility, I'll keep
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* it ".ethereal" for now.
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*/
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#define PF_DIR ".ethereal"
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#endif
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/*
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* Get the directory in which personal configuration files reside;
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* in UNIX-compatible systems, it's ".ethereal", under the user's home
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* directory, and on Windows systems, it's "Ethereal", under %APPDATA%
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* or, if %APPDATA% isn't set, it's "%USERPROFILE%\Application Data"
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* (which is what %APPDATA% normally is on Windows 2000).
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*/
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static const char *
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get_persconffile_dir(void)
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{
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#ifdef _WIN32
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char *appdatadir;
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char *userprofiledir;
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#else
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char *homedir;
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struct passwd *pwd;
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#endif
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static char *pf_dir = NULL;
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/* Return the cached value, if available */
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if (pf_dir != NULL)
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return pf_dir;
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#ifdef _WIN32
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/*
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* Use %APPDATA% or %USERPROFILE%, so that configuration files are
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* stored in the user profile, rather than in the home directory.
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* The Windows convention is to store configuration information
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* in the user profile, and doing so means you can use
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* Ethereal even if the home directory is an inaccessible
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* network drive.
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*/
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appdatadir = getenv("APPDATA");
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if (appdatadir != NULL) {
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/*
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* Concatenate %APPDATA% with "\Ethereal".
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*/
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pf_dir = g_malloc(strlen(appdatadir) + strlen(PF_DIR) + 2);
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sprintf(pf_dir, "%s" G_DIR_SEPARATOR_S "%s", appdatadir,
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PF_DIR);
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} else {
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/*
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* OK, %APPDATA% wasn't set, so use
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* %USERPROFILE%\Application Data.
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*/
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userprofiledir = getenv("USERPROFILE");
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if (userprofiledir != NULL) {
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pf_dir = g_malloc(strlen(userprofiledir) +
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strlen("Application Data") + strlen(PF_DIR) + 3);
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sprintf(pf_dir,
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"%s" G_DIR_SEPARATOR_S "Application Data" G_DIR_SEPARATOR_S "%s",
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userprofiledir, PF_DIR);
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} else {
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/*
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* Give up and use "C:".
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*/
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pf_dir = g_malloc(strlen("C:") + strlen(PF_DIR) + 2);
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sprintf(pf_dir, "C:" G_DIR_SEPARATOR_S "%s", PF_DIR);
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}
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}
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#else
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/*
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* If $HOME is set, use that.
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*/
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homedir = getenv("HOME");
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if (homedir == 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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homedir = g_strdup(pwd->pw_dir);
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} else
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homedir = "/tmp";
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}
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pf_dir = g_malloc(strlen(homedir) + strlen(PF_DIR) + 2);
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sprintf(pf_dir, "%s" G_DIR_SEPARATOR_S "%s", homedir, PF_DIR);
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#endif
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return pf_dir;
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}
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/*
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* Create the directory that holds personal configuration files, if
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* necessary. If we attempted to create it, and failed, return -1 and
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* set "*pf_dir_path_return" to the pathname of the directory we failed
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* to create (it's g_mallocated, so our caller should free it); otherwise,
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* return 0.
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*/
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int
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create_persconffile_dir(char **pf_dir_path_return)
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{
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const char *pf_dir_path;
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#ifdef _WIN32
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char *pf_dir_path_copy, *pf_dir_parent_path;
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size_t pf_dir_parent_path_len;
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#endif
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struct stat s_buf;
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int ret;
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pf_dir_path = get_persconffile_dir();
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if (stat(pf_dir_path, &s_buf) != 0 && errno == ENOENT) {
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#ifdef _WIN32
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/*
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* Does the parent directory of that directory
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* exist? %APPDATA% may not exist even though
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* %USERPROFILE% does.
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*
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* We check for the existence of the directory
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* by first checking whether the parent directory
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* is just a drive letter and, if it's not, by
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* doing a "stat()" on it. If it's a drive letter,
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* or if the "stat()" succeeds, we assume it exists.
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*/
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pf_dir_path_copy = g_strdup(pf_dir_path);
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pf_dir_parent_path = get_dirname(pf_dir_path_copy);
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pf_dir_parent_path_len = strlen(pf_dir_parent_path);
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if (pf_dir_parent_path_len > 0
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&& pf_dir_parent_path[pf_dir_parent_path_len - 1] != ':'
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&& stat(pf_dir_parent_path, &s_buf) != 0) {
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/*
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* No, it doesn't exist - make it first.
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*/
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ret = mkdir(pf_dir_parent_path);
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if (ret == -1) {
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*pf_dir_path_return = pf_dir_parent_path;
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return -1;
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}
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}
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g_free(pf_dir_path_copy);
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ret = mkdir(pf_dir_path);
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#else
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ret = mkdir(pf_dir_path, 0755);
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#endif
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} else {
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/*
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* Something with that pathname exists; if it's not
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* a directory, we'll get an error if we try to put
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* something in it, so we don't fail here, we wait
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* for that attempt fo fail.
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*/
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ret = 0;
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}
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if (ret == -1)
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*pf_dir_path_return = g_strdup(pf_dir_path);
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return ret;
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}
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#ifdef _WIN32
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/*
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* Returns the user's home directory on Win32.
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*/
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static 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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char *homedrive, *homepath;
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char *homestring;
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char *lastsep;
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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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/*
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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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* Give up and use C:.
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*/
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|
home = "C:";
|
|
}
|
|
|
|
return home;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Construct the path name of a personal configuration file, given the
|
|
* file name.
|
|
*
|
|
* On Win32, if "for_writing" is FALSE, we check whether the file exists
|
|
* and, if not, construct a path name relative to the ".ethereal"
|
|
* subdirectory of the user's home directory, and check whether that
|
|
* exists; if it does, we return that, so that configuration files
|
|
* from earlier versions can be read.
|
|
*/
|
|
char *
|
|
get_persconffile_path(const char *filename, gboolean for_writing
|
|
#ifndef _WIN32
|
|
_U_
|
|
#endif
|
|
)
|
|
{
|
|
char *path;
|
|
#ifdef _WIN32
|
|
struct stat s_buf;
|
|
char *old_path;
|
|
#endif
|
|
|
|
path = (gchar *) g_malloc(strlen(get_persconffile_dir()) +
|
|
strlen(filename) + 2);
|
|
sprintf(path, "%s" G_DIR_SEPARATOR_S "%s", get_persconffile_dir(),
|
|
filename);
|
|
#ifdef _WIN32
|
|
if (!for_writing) {
|
|
if (stat(path, &s_buf) != 0 && errno == ENOENT) {
|
|
/*
|
|
* OK, it's not in the personal configuration file
|
|
* directory; is it in the ".ethereal" subdirectory
|
|
* of their home directory?
|
|
*/
|
|
old_path = (gchar *) g_malloc(strlen(get_home_dir()) +
|
|
strlen(".ethereal") + strlen(filename) + 3);
|
|
sprintf(old_path,
|
|
"%s" G_DIR_SEPARATOR_S ".ethereal" G_DIR_SEPARATOR_S "%s",
|
|
get_home_dir(), filename);
|
|
if (stat(old_path, &s_buf) == 0) {
|
|
/*
|
|
* OK, it exists; return it instead.
|
|
*/
|
|
g_free(path);
|
|
path = old_path;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return path;
|
|
}
|
|
|
|
/*
|
|
* Construct the path name of a global configuration file, given the
|
|
* file name.
|
|
*/
|
|
char *
|
|
get_datafile_path(const char *filename)
|
|
{
|
|
char *path;
|
|
|
|
path = (gchar *) g_malloc(strlen(get_datafile_dir()) +
|
|
strlen(filename) + 2);
|
|
sprintf(path, "%s" G_DIR_SEPARATOR_S "%s", get_datafile_dir(),
|
|
filename);
|
|
|
|
return path;
|
|
}
|
|
|
|
/* Delete a file */
|
|
gboolean
|
|
deletefile(const char *path)
|
|
{
|
|
return unlink(path) == 0;
|
|
}
|
|
|
|
/*
|
|
* Construct and return the path name of a file in the
|
|
* appropriate temporary file directory.
|
|
*/
|
|
char *get_tempfile_path(const char *filename)
|
|
{
|
|
char *path;
|
|
|
|
path = (gchar *) g_malloc(strlen(g_get_tmp_dir()) +
|
|
strlen(filename) + 2);
|
|
sprintf(path, "%s" G_DIR_SEPARATOR_S "%s", g_get_tmp_dir(), filename);
|
|
|
|
return path;
|
|
}
|
|
|
|
/*
|
|
* Return an error message for UNIX-style errno indications on open or
|
|
* create operations.
|
|
*/
|
|
char *
|
|
file_open_error_message(int err, gboolean for_writing)
|
|
{
|
|
char *errmsg;
|
|
static char errmsg_errno[1024+1];
|
|
|
|
switch (err) {
|
|
|
|
case ENOENT:
|
|
if (for_writing)
|
|
errmsg = "The path to the file \"%s\" doesn't exist.";
|
|
else
|
|
errmsg = "The file \"%s\" doesn't exist.";
|
|
break;
|
|
|
|
case EACCES:
|
|
if (for_writing)
|
|
errmsg = "You don't have permission to create or write to the file \"%s\".";
|
|
else
|
|
errmsg = "You don't have permission to read the file \"%s\".";
|
|
break;
|
|
|
|
case EISDIR:
|
|
errmsg = "\"%s\" is a directory (folder), not a file.";
|
|
break;
|
|
|
|
case ENOSPC:
|
|
errmsg = "The file \"%s\" could not be created because there is no space left on the file system.";
|
|
break;
|
|
|
|
#ifdef EDQUOT
|
|
case EDQUOT:
|
|
errmsg = "The file \"%s\" could not be created because you are too close to, or over, your disk quota.";
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
snprintf(errmsg_errno, sizeof(errmsg_errno),
|
|
"The file \"%%s\" could not be %s: %s.",
|
|
for_writing ? "created" : "opened",
|
|
strerror(err));
|
|
errmsg = errmsg_errno;
|
|
break;
|
|
}
|
|
return errmsg;
|
|
}
|
|
|
|
/*
|
|
* Return an error message for UNIX-style errno indications on write
|
|
* operations.
|
|
*/
|
|
char *
|
|
file_write_error_message(int err)
|
|
{
|
|
char *errmsg;
|
|
static char errmsg_errno[1024+1];
|
|
|
|
switch (err) {
|
|
|
|
case ENOSPC:
|
|
errmsg = "The file \"%s\" could not be saved because there is no space left on the file system.";
|
|
break;
|
|
|
|
#ifdef EDQUOT
|
|
case EDQUOT:
|
|
errmsg = "The file \"%s\" could not be saved because you are too close to, or over, your disk quota.";
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
snprintf(errmsg_errno, sizeof(errmsg_errno),
|
|
"An error occurred while writing to the file \"%%s\": %s.",
|
|
strerror(err));
|
|
errmsg = errmsg_errno;
|
|
break;
|
|
}
|
|
return errmsg;
|
|
}
|
|
|
|
|
|
gboolean
|
|
file_exists(const char *fname)
|
|
{
|
|
struct stat file_stat;
|
|
|
|
|
|
/*
|
|
* This is a bit tricky on win32. The st_ino field is documented as:
|
|
* "The inode, and therefore st_ino, has no meaning in the FAT, ..."
|
|
* but it *is* set to zero if stat() returns without an error,
|
|
* so this is working, but maybe not quite the way expected. ULFL
|
|
*/
|
|
file_stat.st_ino = 1; /* this will make things work if an error occured */
|
|
stat(fname, &file_stat);
|
|
if (file_stat.st_ino == 0) {
|
|
return TRUE;
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
gboolean
|
|
files_identical(const char *fname1, const char *fname2)
|
|
{
|
|
/* Two different implementations, because:
|
|
* - _fullpath is not available on unix
|
|
* - the stat inode will not work as expected on Win32, so two different implementations.
|
|
*
|
|
* XXX - will _fullpath work with UNC?
|
|
*/
|
|
#ifdef _WIN32
|
|
char full1[MAX_PATH], full2[MAX_PATH];
|
|
|
|
|
|
if( _fullpath( full1, fname1, MAX_PATH ) == NULL ) {
|
|
return FALSE;
|
|
}
|
|
|
|
if( _fullpath( full2, fname2, MAX_PATH ) == NULL ) {
|
|
return FALSE;
|
|
}
|
|
|
|
if(strcmp(full1, full2) == 0) {
|
|
return TRUE;
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
#else
|
|
struct stat infile, outfile;
|
|
|
|
/*
|
|
* Check that the from file is not the same as to file
|
|
* We do it here so we catch all cases ...
|
|
* Unfortunately, the file requester gives us an absolute file
|
|
* name and the read file name may be relative (if supplied on
|
|
* the command line). From Joerg Mayer.
|
|
*
|
|
* This is a bit tricky on win32. The st_ino field is documented as:
|
|
* "The inode, and therefore st_ino, has no meaning in the FAT, ..."
|
|
* but it *is* set to zero if stat() returns without an error,
|
|
* so this is not working, as it only checks if both files existing. ULFL
|
|
*/
|
|
infile.st_ino = 1; /* These prevent us from getting equality */
|
|
outfile.st_ino = 2; /* If one or other of the files is not accessible */
|
|
stat(fname1, &infile);
|
|
stat(fname2, &outfile);
|
|
if (infile.st_ino == outfile.st_ino) {
|
|
return TRUE;
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
|
|
#endif
|
|
}
|
|
|