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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2011 - David Sommerseth <davids@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif
#ifndef HAVE_DIRNAME
#include "compat.h"
#include <string.h>
/* Unoptimised version of glibc memrchr().
* This is considered fast enough, as only this compat
* version of dirname() depends on it.
*/
static const char *
__memrchr(const char *str, int c, size_t n)
{
const char *end = str;
end += n - 1; /* Go to the end of the string */
while (end >= str)
{
if (c == *end)
{
return end;
}
else
{
end--;
}
}
return NULL;
}
/* Modified version based on glibc-2.14.1 by Ulrich Drepper <drepper@akkadia.org>
* This version is extended to handle both / and \ in path names.
*/
char *
dirname(char *path)
{
static const char dot[] = ".";
char *last_slash;
char separator = '/';
/* Find last '/'. */
last_slash = path != NULL ? strrchr(path, '/') : NULL;
/* If NULL, check for \ instead ... might be Windows a path */
if (!last_slash)
{
last_slash = path != NULL ? strrchr(path, '\\') : NULL;
separator = last_slash ? '\\' : '/'; /* Change the separator if \ was found */
}
if (last_slash != NULL && last_slash != path && last_slash[1] == '\0')
{
/* Determine whether all remaining characters are slashes. */
char *runp;
for (runp = last_slash; runp != path; --runp)
{
if (runp[-1] != separator)
{
break;
}
}
/* The '/' is the last character, we have to look further. */
if (runp != path)
{
last_slash = (char *) __memrchr(path, separator, runp - path);
}
}
if (last_slash != NULL)
{
/* Determine whether all remaining characters are slashes. */
char *runp;
for (runp = last_slash; runp != path; --runp)
{
if (runp[-1] != separator)
{
break;
}
}
/* Terminate the path. */
if (runp == path)
{
/* The last slash is the first character in the string. We have to
* return "/". As a special case we have to return "//" if there
* are exactly two slashes at the beginning of the string. See
* XBD 4.10 Path Name Resolution for more information. */
if (last_slash == path + 1)
{
++last_slash;
}
else
{
last_slash = path + 1;
}
}
else
{
last_slash = runp;
}
last_slash[0] = '\0';
}
else
{
/* This assignment is ill-designed but the XPG specs require to
* return a string containing "." in any case no directory part is
* found and so a static and constant string is required. */
path = (char *) dot;
}
return path;
}
#endif /* HAVE_DIRNAME */
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