ufilesystem.cpp

Go to the documentation of this file.

/* Copyright (c) 2010 Wildfire Games
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * Unix implementation of wchar_t versions of POSIX filesystem functions
 */

#include "precompiled.h"
#include "lib/sysdep/filesystem.h"

#include "lib/path.h"

#include <cstdio>

struct WDIR
{
    DIR* d;
    wchar_t name[PATH_MAX];
    wdirent ent;
};

#if OS_ANDROID

// The Crystax NDK seems to do weird things with opendir etc.
// To avoid that, load the symbols directly from the real libc
// and use them instead.

#include <dlfcn.h>

static void* libc;
static DIR* (*libc_opendir)(const char*);
static dirent* (*libc_readdir)(DIR*);
static int (*libc_closedir)(DIR*);

void init_libc()
{
    if (libc)
        return;
    libc = dlopen("/system/lib/libc.so", RTLD_LAZY);
    ENSURE(libc);
    libc_opendir = (DIR*(*)(const char*))dlsym(libc, "opendir");
    libc_readdir = (dirent*(*)(DIR*))dlsym(libc, "readdir");
    libc_closedir = (int(*)(DIR*))dlsym(libc, "closedir");
    ENSURE(libc_opendir && libc_readdir && libc_closedir);
}

#define opendir libc_opendir
#define readdir libc_readdir
#define closedir libc_closedir

#else

void init_libc() { }

#endif

WDIR* wopendir(const OsPath& path)
{
    init_libc();
    DIR* d = opendir(OsString(path).c_str());
    if(!d)
        return 0;
    WDIR* wd = new WDIR;
    wd->d = d;
    wd->name[0] = '\0';
    wd->ent.d_name = wd->name;
    return wd;
}

struct wdirent* wreaddir(WDIR* wd)
{
    dirent* ent = readdir(wd->d);
    if(!ent)
        return 0;
    wcscpy_s(wd->name, ARRAY_SIZE(wd->name), OsPath(ent->d_name).string().c_str());
    return &wd->ent;
}

int wclosedir(WDIR* wd)
{
    int ret = closedir(wd->d);
    delete wd;
    return ret;
}


int wopen(const OsPath& pathname, int oflag)
{
    ENSURE(!(oflag & O_CREAT));
    return open(OsString(pathname).c_str(), oflag);
}

int wopen(const OsPath& pathname, int oflag, mode_t mode)
{
    return open(OsString(pathname).c_str(), oflag, mode);
}

int wclose(int fd)
{
    return close(fd);
}


int wtruncate(const OsPath& pathname, off_t length)
{
    return truncate(OsString(pathname).c_str(), length);
}

int wunlink(const OsPath& pathname)
{
    return unlink(OsString(pathname).c_str());
}

int wrmdir(const OsPath& path)
{
    return rmdir(OsString(path).c_str());
}

int wrename(const OsPath& pathnameOld, const OsPath& pathnameNew)
{
    return rename(OsString(pathnameOld).c_str(), OsString(pathnameNew).c_str());
}

OsPath wrealpath(const OsPath& pathname)
{
    char resolvedBuf[PATH_MAX];
    const char* resolved = realpath(OsString(pathname).c_str(), resolvedBuf);
    if(!resolved)
        return OsPath();
    return resolved;
}

int wstat(const OsPath& pathname, struct stat* buf)
{
    return stat(OsString(pathname).c_str(), buf);
}

int wmkdir(const OsPath& path, mode_t mode)
{
    return mkdir(OsString(path).c_str(), mode);
}