cmd.c

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/*
 *  CMD.C - command-line interface.
 *
 *
 *  History:
 *
 *    17 Jun 1994 (Tim Norman)
 *        started.
 *
 *    08 Aug 1995 (Matt Rains)
 *        I have cleaned up the source code. changes now bring this source
 *        into guidelines for recommended programming practice.
 *
 *        A added the the standard FreeDOS GNU licence test to the
 *        initialize() function.
 *
 *        Started to replace puts() with printf(). this will help
 *        standardize output. please follow my lead.
 *
 *        I have added some constants to help making changes easier.
 *
 *    15 Dec 1995 (Tim Norman)
 *        major rewrite of the code to make it more efficient and add
 *        redirection support (finally!)
 *
 *    06 Jan 1996 (Tim Norman)
 *        finished adding redirection support!  Changed to use our own
 *        exec code (MUCH thanks to Svante Frey!!)
 *
 *    29 Jan 1996 (Tim Norman)
 *        added support for CHDIR, RMDIR, MKDIR, and ERASE, as per
 *        suggestion of Steffan Kaiser
 *
 *        changed "file not found" error message to "bad command or
 *        filename" thanks to Dustin Norman for noticing that confusing
 *        message!
 *
 *        changed the format to call internal commands (again) so that if
 *        they want to split their commands, they can do it themselves
 *        (none of the internal functions so far need that much power, anyway)
 *
 *    27 Aug 1996 (Tim Norman)
 *        added in support for Oliver Mueller's ALIAS command
 *
 *    14 Jun 1997 (Steffan Kaiser)
 *        added ctrl-break handling and error level
 *
 *    16 Jun 1998 (Rob Lake)
 *        Runs command.com if /P is specified in command line.  Command.com
 *        also stays permanent.  If /C is in the command line, starts the
 *        program next in the line.
 *
 *    21 Jun 1998 (Rob Lake)
 *        Fixed up /C so that arguments for the program
 *
 *    08-Jul-1998 (John P. Price)
 *        Now sets COMSPEC environment variable
 *        misc clean up and optimization
 *        added date and time commands
 *        changed to using spawnl instead of exec.  exec does not copy the
 *        environment to the child process!
 *
 *    14 Jul 1998 (Hans B Pufal)
 *        Reorganised source to be more efficient and to more closely
 *        follow MS-DOS conventions. (eg %..% environment variable
 *        replacement works form command line as well as batch file.
 *
 *        New organisation also properly support nested batch files.
 *
 *        New command table structure is half way towards providing a
 *        system in which COMMAND will find out what internal commands
 *        are loaded
 *
 *    24 Jul 1998 (Hans B Pufal) [HBP_003]
 *        Fixed return value when called with /C option
 *
 *    27 Jul 1998  John P. Price
 *        added config.h include
 *
 *    28 Jul 1998  John P. Price
 *        added showcmds function to show commands and options available
 *
 *    07-Aug-1998 (John P Price <linux-guru@gcfl.net>)
 *        Fixed carriage return output to better match MSDOS with echo
 *        on or off. (marked with "JPP 19980708")
 *
 *    07-Dec-1998 (Eric Kohl)
 *        First ReactOS release.
 *        Extended length of commandline buffers to 512.
 *
 *    13-Dec-1998 (Eric Kohl)
 *        Added COMSPEC environment variable.
 *        Added "/t" support (color) on cmd command line.
 *
 *    07-Jan-1999 (Eric Kohl)
 *        Added help text ("cmd /?").
 *
 *    25-Jan-1999 (Eric Kohl)
 *        Unicode and redirection safe!
 *        Fixed redirections and piping.
 *        Piping is based on temporary files, but basic support
 *        for anonymous pipes already exists.
 *
 *    27-Jan-1999 (Eric Kohl)
 *        Replaced spawnl() by CreateProcess().
 *
 *    22-Oct-1999 (Eric Kohl)
 *        Added break handler.
 *
 *    15-Dec-1999 (Eric Kohl)
 *        Fixed current directory
 *
 *    28-Dec-1999 (Eric Kohl)
 *        Restore window title after program/batch execution
 *
 *    03-Feb-2001 (Eric Kohl)
 *        Workaround because argc[0] is NULL under ReactOS
 *
 *    23-Feb-2001 (Carl Nettelblad <cnettel@hem.passagen.se>)
 *        %envvar% replacement conflicted with for.
 *
 *    30-Apr-2004 (Filip Navara <xnavara@volny.cz>)
 *       Make MakeSureDirectoryPathExistsEx unicode safe.
 *
 *    28-Mai-2004
 *       Removed MakeSureDirectoryPathExistsEx.
 *       Use the current directory if GetTempPath fails.
 *
 *    12-Jul-2004 (Jens Collin <jens.collin@lakhei.com>)
 *       Added ShellExecute call when all else fails to be able to "launch" any file.
 *
 *    02-Apr-2005 (Magnus Olsen <magnus@greatlord.com>)
 *        Remove all hardcode string to En.rc
 *
 *    06-May-2005 (Klemens Friedl <frik85@gmail.com>)
 *        Add 'help' command (list all commands plus description)
 *
 *    06-jul-2005 (Magnus Olsen <magnus@greatlord.com>)
 *        translate '%errorlevel%' to the internal value.
 *        Add proper memory alloc ProcessInput, the error
 *        handling for memory handling need to be improve
 */

#include "precomp.h"
#include <reactos/buildno.h>
#include <reactos/version.h>

typedef NTSTATUS (WINAPI *NtQueryInformationProcessProc)(HANDLE, PROCESSINFOCLASS,
                                                          PVOID, ULONG, PULONG);
typedef NTSTATUS (WINAPI *NtReadVirtualMemoryProc)(HANDLE, PVOID, PVOID, ULONG, PULONG);

BOOL bExit = FALSE;       /* indicates EXIT was typed */
BOOL bCanExit = TRUE;     /* indicates if this shell is exitable */
BOOL bCtrlBreak = FALSE;  /* Ctrl-Break or Ctrl-C hit */
BOOL bIgnoreEcho = FALSE; /* Set this to TRUE to prevent a newline, when executing a command */
static BOOL bWaitForCommand = FALSE; /* When we are executing something passed on the commandline after /c or /k */
INT  nErrorLevel = 0;     /* Errorlevel of last launched external program */
CRITICAL_SECTION ChildProcessRunningLock;
BOOL bDisableBatchEcho = FALSE;
BOOL bEnableExtensions = TRUE;
BOOL bDelayedExpansion = FALSE;
BOOL bTitleSet = FALSE;
DWORD dwChildProcessId = 0;
LPTSTR lpOriginalEnvironment;
HANDLE CMD_ModuleHandle;

static NtQueryInformationProcessProc NtQueryInformationProcessPtr = NULL;
static NtReadVirtualMemoryProc       NtReadVirtualMemoryPtr = NULL;

/*
 * Default output file stream translation mode is UTF8, but CMD switches
 * allow to change it to either UTF16 (/U) or ANSI (/A).
 */
CON_STREAM_MODE OutputStreamMode = UTF8Text; // AnsiText;

#ifdef INCLUDE_CMD_COLOR
WORD wDefColor = 0;     /* Default color */
#endif

/*
 * convert
 *
 * insert commas into a number
 */
INT
ConvertULargeInteger(ULONGLONG num, LPTSTR des, UINT len, BOOL bPutSeparator)
{
    TCHAR temp[39];   /* maximum length with nNumberGroups == 1 */
    UINT  n, iTarget;

    if (len <= 1)
        return 0;

    n = 0;
    iTarget = nNumberGroups;
    if (!nNumberGroups)
        bPutSeparator = FALSE;

    do
    {
        if (iTarget == n && bPutSeparator)
        {
            iTarget += nNumberGroups + 1;
            temp[38 - n++] = cThousandSeparator;
        }
        temp[38 - n++] = (TCHAR)(num % 10) + _T('0');
        num /= 10;
    } while (num > 0);
    if (n > len-1)
        n = len-1;

    memcpy(des, temp + 39 - n, n * sizeof(TCHAR));
    des[n] = _T('\0');

    return n;
}

/*
 * Is a process a console process?
 */
static BOOL IsConsoleProcess(HANDLE Process)
{
    NTSTATUS Status;
    PROCESS_BASIC_INFORMATION Info;
    PEB ProcessPeb;
    ULONG BytesRead;

    if (NULL == NtQueryInformationProcessPtr || NULL == NtReadVirtualMemoryPtr)
    {
        return TRUE;
    }

    Status = NtQueryInformationProcessPtr (
        Process, ProcessBasicInformation,
        &Info, sizeof(PROCESS_BASIC_INFORMATION), NULL);
    if (! NT_SUCCESS(Status))
    {
        WARN ("NtQueryInformationProcess failed with status %08x\n", Status);
        return TRUE;
    }
    Status = NtReadVirtualMemoryPtr (
        Process, Info.PebBaseAddress, &ProcessPeb,
        sizeof(PEB), &BytesRead);
    if (! NT_SUCCESS(Status) || sizeof(PEB) != BytesRead)
    {
        WARN ("Couldn't read virt mem status %08x bytes read %lu\n", Status, BytesRead);
        return TRUE;
    }

    return IMAGE_SUBSYSTEM_WINDOWS_CUI == ProcessPeb.ImageSubsystem;
}



#ifdef _UNICODE
#define SHELLEXECUTETEXT    "ShellExecuteExW"
#else
#define SHELLEXECUTETEXT    "ShellExecuteExA"
#endif

typedef BOOL (WINAPI *MYEX)(LPSHELLEXECUTEINFO lpExecInfo);

HANDLE RunFile(DWORD flags, LPTSTR filename, LPTSTR params,
               LPTSTR directory, INT show)
{
    SHELLEXECUTEINFO sei;
    HMODULE     hShell32;
    MYEX        hShExt;
    BOOL        ret;

    TRACE ("RunFile(%s)\n", debugstr_aw(filename));
    hShell32 = LoadLibrary(_T("SHELL32.DLL"));
    if (!hShell32)
    {
        WARN ("RunFile: couldn't load SHELL32.DLL!\n");
        return NULL;
    }

    hShExt = (MYEX)(FARPROC)GetProcAddress(hShell32, SHELLEXECUTETEXT);
    if (!hShExt)
    {
        WARN ("RunFile: couldn't find ShellExecuteExA/W in SHELL32.DLL!\n");
        FreeLibrary(hShell32);
        return NULL;
    }

    TRACE ("RunFile: ShellExecuteExA/W is at %x\n", hShExt);

    memset(&sei, 0, sizeof sei);
    sei.cbSize = sizeof sei;
    sei.fMask = flags;
    sei.lpFile = filename;
    sei.lpParameters = params;
    sei.lpDirectory = directory;
    sei.nShow = show;
    ret = hShExt(&sei);

    TRACE ("RunFile: ShellExecuteExA/W returned 0x%p\n", ret);

    FreeLibrary(hShell32);
    return ret ? sei.hProcess : NULL;
}



/*
 * This command (in first) was not found in the command table
 *
 * Full  - buffer to hold whole command line
 * First - first word on command line
 * Rest  - rest of command line
 */
static INT
Execute(LPTSTR Full, LPTSTR First, LPTSTR Rest, PARSED_COMMAND *Cmd)
{
    TCHAR szFullName[MAX_PATH];
    TCHAR *first, *rest, *dot;
    TCHAR szWindowTitle[MAX_PATH];
    TCHAR szNewTitle[MAX_PATH*2];
    DWORD dwExitCode = 0;
    TCHAR *FirstEnd;
    TCHAR szFullCmdLine[CMDLINE_LENGTH];

    TRACE ("Execute: \'%s\' \'%s\'\n", debugstr_aw(First), debugstr_aw(Rest));

    /* Though it was already parsed once, we have a different set of rules
       for parsing before we pass to CreateProcess */
    if (First[0] == _T('/') || (First[0] && First[1] == _T(':')))
    {
        /* Use the entire first word as the program name (no change) */
        FirstEnd = First + _tcslen(First);
    }
    else
    {
        /* If present in the first word, spaces and ,;=/ end the program
         * name and become the beginning of its parameters. */
        BOOL bInside = FALSE;
        for (FirstEnd = First; *FirstEnd; FirstEnd++)
        {
            if (!bInside && (_istspace(*FirstEnd) || _tcschr(_T(",;=/"), *FirstEnd)))
                break;
            bInside ^= *FirstEnd == _T('"');
        }
    }

    /* Copy the new first/rest into the buffer */
    first = Full;
    rest = &Full[FirstEnd - First + 1];
    _tcscpy(rest, FirstEnd);
    _tcscat(rest, Rest);
    *FirstEnd = _T('\0');
    _tcscpy(first, First);

    /* check for a drive change */
    if ((_istalpha (first[0])) && (!_tcscmp (first + 1, _T(":"))))
    {
        BOOL working = TRUE;
        if (!SetCurrentDirectory(first))
        /* Guess they changed disc or something, handle that gracefully and get to root */
        {
            TCHAR str[4];
            str[0]=first[0];
            str[1]=_T(':');
            str[2]=_T('\\');
            str[3]=0;
            working = SetCurrentDirectory(str);
        }

        if (!working) ConErrResPuts (STRING_FREE_ERROR1);
        return !working;
    }

    /* get the PATH environment variable and parse it */
    /* search the PATH environment variable for the binary */
    StripQuotes(First);
    if (!SearchForExecutable(First, szFullName))
    {
        error_bad_command(first);
        return 1;
    }

    /* Save the original console title and build a new one */
    GetConsoleTitle(szWindowTitle, ARRAYSIZE(szWindowTitle));
    bTitleSet = FALSE;
    _stprintf(szNewTitle, _T("%s - %s%s"), szWindowTitle, First, Rest);
    ConSetTitle(szNewTitle);

    /* check if this is a .BAT or .CMD file */
    dot = _tcsrchr (szFullName, _T('.'));
    if (dot && (!_tcsicmp (dot, _T(".bat")) || !_tcsicmp (dot, _T(".cmd"))))
    {
        while (*rest == _T(' '))
            rest++;
        TRACE ("[BATCH: %s %s]\n", debugstr_aw(szFullName), debugstr_aw(rest));
        dwExitCode = Batch(szFullName, first, rest, Cmd);
    }
    else
    {
        /* exec the program */
        PROCESS_INFORMATION prci;
        STARTUPINFO stui;

        /* build command line for CreateProcess(): FullName + " " + rest */
        BOOL quoted = !!_tcschr(First, ' ');
        _tcscpy(szFullCmdLine, quoted ? _T("\"") : _T(""));
        _tcsncat(szFullCmdLine, First, CMDLINE_LENGTH - _tcslen(szFullCmdLine) - 1);
        _tcsncat(szFullCmdLine, quoted ? _T("\"") : _T(""), CMDLINE_LENGTH - _tcslen(szFullCmdLine) - 1);

        if (*rest)
        {
            _tcsncat(szFullCmdLine, _T(" "), CMDLINE_LENGTH - _tcslen(szFullCmdLine) - 1);
            _tcsncat(szFullCmdLine, rest, CMDLINE_LENGTH - _tcslen(szFullCmdLine) - 1);
        }

        TRACE ("[EXEC: %s]\n", debugstr_aw(szFullCmdLine));

        /* fill startup info */
        memset (&stui, 0, sizeof (STARTUPINFO));
        stui.cb = sizeof (STARTUPINFO);
        stui.dwFlags = STARTF_USESHOWWINDOW;
        stui.wShowWindow = SW_SHOWDEFAULT;

        /* Set the console to standard mode */
        SetConsoleMode(ConStreamGetOSHandle(StdIn),
                       ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT);

        if (CreateProcess(szFullName,
                          szFullCmdLine,
                          NULL,
                          NULL,
                          TRUE,
                          0,   /* CREATE_NEW_PROCESS_GROUP */
                          NULL,
                          NULL,
                          &stui,
                          &prci))
        {
            CloseHandle(prci.hThread);
        }
        else
        {
            // See if we can run this with ShellExecute() ie myfile.xls
            prci.hProcess = RunFile(SEE_MASK_NOCLOSEPROCESS | SEE_MASK_NO_CONSOLE,
                                    szFullName,
                                    rest,
                                    NULL,
                                    SW_SHOWNORMAL);
        }

        if (prci.hProcess != NULL)
        {
            if (bc != NULL || bWaitForCommand || IsConsoleProcess(prci.hProcess))
            {
                /* when processing a batch file or starting console processes: execute synchronously */
                EnterCriticalSection(&ChildProcessRunningLock);
                dwChildProcessId = prci.dwProcessId;

                WaitForSingleObject(prci.hProcess, INFINITE);

                LeaveCriticalSection(&ChildProcessRunningLock);

                GetExitCodeProcess(prci.hProcess, &dwExitCode);
                nErrorLevel = (INT)dwExitCode;
            }
            CloseHandle(prci.hProcess);
        }
        else
        {
            TRACE ("[ShellExecute failed!: %s]\n", debugstr_aw(Full));
            error_bad_command(first);
            dwExitCode = 1;
        }

        /* Restore our default console mode */
        SetConsoleMode(ConStreamGetOSHandle(StdIn),
                       ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT);
        SetConsoleMode(ConStreamGetOSHandle(StdOut),
                       ENABLE_PROCESSED_OUTPUT | ENABLE_WRAP_AT_EOL_OUTPUT);
    }

    /* Update our local codepage cache */
    {
        UINT uNewInputCodePage  = GetConsoleCP();
        UINT uNewOutputCodePage = GetConsoleOutputCP();

        if ((InputCodePage  != uNewInputCodePage) ||
            (OutputCodePage != uNewOutputCodePage))
        {
            /* Update the locale as well */
            InitLocale();
        }

        InputCodePage  = uNewInputCodePage;
        OutputCodePage = uNewOutputCodePage;

        /* Update the streams codepage cache as well */
        ConStreamSetCacheCodePage(StdIn , InputCodePage );
        ConStreamSetCacheCodePage(StdOut, OutputCodePage);
        ConStreamSetCacheCodePage(StdErr, OutputCodePage);
    }

    /* Restore the original console title */
    if (!bTitleSet)
        ConSetTitle(szWindowTitle);

    return dwExitCode;
}


/*
 * look through the internal commands and determine whether or not this
 * command is one of them.  If it is, call the command.  If not, call
 * execute to run it as an external program.
 *
 * first - first word on command line
 * rest  - rest of command line
 */
INT
DoCommand(LPTSTR first, LPTSTR rest, PARSED_COMMAND *Cmd)
{
    TCHAR *com;
    TCHAR *cp;
    LPTSTR param;   /* pointer to command's parameters */
    INT cl;
    LPCOMMAND cmdptr;
    BOOL nointernal = FALSE;
    INT ret;

    TRACE ("DoCommand: (\'%s\' \'%s\')\n", debugstr_aw(first), debugstr_aw(rest));

    /* full command line */
    com = cmd_alloc((_tcslen(first) + _tcslen(rest) + 2) * sizeof(TCHAR));
    if (com == NULL)
    {
        error_out_of_memory();
        return 1;
    }

    /* If present in the first word, these characters end the name of an
     * internal command and become the beginning of its parameters. */
    cp = first + _tcscspn(first, _T("\t +,/;=[]"));

    for (cl = 0; cl < (cp - first); cl++)
    {
        /* These characters do it too, but if one of them is present,
         * then we check to see if the word is a file name and skip
         * checking for internal commands if so.
         * This allows running programs with names like "echo.exe" */
        if (_tcschr(_T(".:\\"), first[cl]))
        {
            TCHAR tmp = *cp;
            *cp = _T('\0');
            nointernal = IsExistingFile(first);
            *cp = tmp;
            break;
        }
    }

    /* Scan internal command table */
    for (cmdptr = cmds; !nointernal && cmdptr->name; cmdptr++)
    {
        if (!_tcsnicmp(first, cmdptr->name, cl) && cmdptr->name[cl] == _T('\0'))
        {
            _tcscpy(com, first);
            _tcscat(com, rest);
            param = &com[cl];

            /* Skip over whitespace to rest of line, exclude 'echo' command */
            if (_tcsicmp(cmdptr->name, _T("echo")) != 0)
                while (_istspace(*param))
                    param++;
            ret = cmdptr->func(param);
            cmd_free(com);
            return ret;
        }
    }

    ret = Execute(com, first, rest, Cmd);
    cmd_free(com);
    return ret;
}


/*
 * process the command line and execute the appropriate functions
 * full input/output redirection and piping are supported
 */
INT ParseCommandLine(LPTSTR cmd)
{
    INT Ret = 0;
    PARSED_COMMAND *Cmd = ParseCommand(cmd);
    if (Cmd)
    {
        Ret = ExecuteCommand(Cmd);
        FreeCommand(Cmd);
    }
    return Ret;
}

/* Execute a command without waiting for it to finish. If it's an internal
 * command or batch file, we must create a new cmd.exe process to handle it.
 * TODO: For now, this just always creates a cmd.exe process.
 *       This works, but is inefficient for running external programs,
 *       which could just be run directly. */
static HANDLE
ExecuteAsync(PARSED_COMMAND *Cmd)
{
    TCHAR CmdPath[MAX_PATH];
    TCHAR CmdParams[CMDLINE_LENGTH], *ParamsEnd;
    STARTUPINFO stui;
    PROCESS_INFORMATION prci;

    /* Get the path to cmd.exe */
    GetModuleFileName(NULL, CmdPath, ARRAYSIZE(CmdPath));

    /* Build the parameter string to pass to cmd.exe */
    ParamsEnd = _stpcpy(CmdParams, _T("/S/D/C\""));
    ParamsEnd = Unparse(Cmd, ParamsEnd, &CmdParams[CMDLINE_LENGTH - 2]);
    if (!ParamsEnd)
    {
        error_out_of_memory();
        return NULL;
    }
    _tcscpy(ParamsEnd, _T("\""));

    memset(&stui, 0, sizeof stui);
    stui.cb = sizeof(STARTUPINFO);
    if (!CreateProcess(CmdPath, CmdParams, NULL, NULL, TRUE, 0,
                       NULL, NULL, &stui, &prci))
    {
        ErrorMessage(GetLastError(), NULL);
        return NULL;
    }

    CloseHandle(prci.hThread);
    return prci.hProcess;
}

static INT
ExecutePipeline(PARSED_COMMAND *Cmd)
{
#ifdef FEATURE_REDIRECTION
    HANDLE hInput = NULL;
    HANDLE hOldConIn = GetStdHandle(STD_INPUT_HANDLE);
    HANDLE hOldConOut = GetStdHandle(STD_OUTPUT_HANDLE);
    HANDLE hProcess[MAXIMUM_WAIT_OBJECTS];
    INT nProcesses = 0;
    DWORD dwExitCode;

    /* Do all but the last pipe command */
    do
    {
        HANDLE hPipeRead, hPipeWrite;
        if (nProcesses > (MAXIMUM_WAIT_OBJECTS - 2))
        {
            error_too_many_parameters(_T("|"));
            goto failed;
        }

        /* Create the pipe that this process will write into.
         * Make the handles non-inheritable initially, because this
         * process shouldn't inherit the reading handle. */
        if (!CreatePipe(&hPipeRead, &hPipeWrite, NULL, 0))
        {
            error_no_pipe();
            goto failed;
        }

        /* The writing side of the pipe is STDOUT for this process */
        SetHandleInformation(hPipeWrite, HANDLE_FLAG_INHERIT, HANDLE_FLAG_INHERIT);
        SetStdHandle(STD_OUTPUT_HANDLE, hPipeWrite);

        /* Execute it (error check is done later for easier cleanup) */
        hProcess[nProcesses] = ExecuteAsync(Cmd->Subcommands);
        CloseHandle(hPipeWrite);
        if (hInput)
            CloseHandle(hInput);

        /* The reading side of the pipe will be STDIN for the next process */
        SetHandleInformation(hPipeRead, HANDLE_FLAG_INHERIT, HANDLE_FLAG_INHERIT);
        SetStdHandle(STD_INPUT_HANDLE, hPipeRead);
        hInput = hPipeRead;

        if (!hProcess[nProcesses])
            goto failed;
        nProcesses++;

        Cmd = Cmd->Subcommands->Next;
    } while (Cmd->Type == C_PIPE);

    /* The last process uses the original STDOUT */
    SetStdHandle(STD_OUTPUT_HANDLE, hOldConOut);
    hProcess[nProcesses] = ExecuteAsync(Cmd);
    if (!hProcess[nProcesses])
        goto failed;
    nProcesses++;
    CloseHandle(hInput);
    SetStdHandle(STD_INPUT_HANDLE, hOldConIn);

    /* Wait for all processes to complete */
    EnterCriticalSection(&ChildProcessRunningLock);
    WaitForMultipleObjects(nProcesses, hProcess, TRUE, INFINITE);
    LeaveCriticalSection(&ChildProcessRunningLock);

    /* Use the exit code of the last process in the pipeline */
    GetExitCodeProcess(hProcess[nProcesses - 1], &dwExitCode);
    nErrorLevel = (INT)dwExitCode;

    while (--nProcesses >= 0)
        CloseHandle(hProcess[nProcesses]);
    return nErrorLevel;

failed:
    if (hInput)
        CloseHandle(hInput);
    while (--nProcesses >= 0)
    {
        TerminateProcess(hProcess[nProcesses], 0);
        CloseHandle(hProcess[nProcesses]);
    }
    SetStdHandle(STD_INPUT_HANDLE, hOldConIn);
    SetStdHandle(STD_OUTPUT_HANDLE, hOldConOut);
#endif

    return nErrorLevel;
}

INT
ExecuteCommand(PARSED_COMMAND *Cmd)
{
    PARSED_COMMAND *Sub;
    LPTSTR First, Rest;
    INT Ret = 0;

    if (!PerformRedirection(Cmd->Redirections))
        return 1;

    switch (Cmd->Type)
    {
    case C_COMMAND:
        Ret = 1;
        First = DoDelayedExpansion(Cmd->Command.First);
        if (First)
        {
            Rest = DoDelayedExpansion(Cmd->Command.Rest);
            if (Rest)
            {
                Ret = DoCommand(First, Rest, Cmd);
                cmd_free(Rest);
            }
            cmd_free(First);
        }
        break;
    case C_QUIET:
    case C_BLOCK:
    case C_MULTI:
        for (Sub = Cmd->Subcommands; Sub; Sub = Sub->Next)
            Ret = ExecuteCommand(Sub);
        break;
    case C_IFFAILURE:
        Sub = Cmd->Subcommands;
        Ret = ExecuteCommand(Sub);
        if (Ret != 0)
        {
            nErrorLevel = Ret;
            Ret = ExecuteCommand(Sub->Next);
        }
        break;
    case C_IFSUCCESS:
        Sub = Cmd->Subcommands;
        Ret = ExecuteCommand(Sub);
        if (Ret == 0)
            Ret = ExecuteCommand(Sub->Next);
        break;
    case C_PIPE:
        Ret = ExecutePipeline(Cmd);
        break;
    case C_IF:
        Ret = ExecuteIf(Cmd);
        break;
    case C_FOR:
        Ret = ExecuteFor(Cmd);
        break;
    }

    UndoRedirection(Cmd->Redirections, NULL);
    return Ret;
}

LPTSTR
GetEnvVar(LPCTSTR varName)
{
    static LPTSTR ret = NULL;
    UINT size;

    cmd_free(ret);
    ret = NULL;
    size = GetEnvironmentVariable(varName, NULL, 0);
    if (size > 0)
    {
        ret = cmd_alloc(size * sizeof(TCHAR));
        if (ret != NULL)
            GetEnvironmentVariable(varName, ret, size + 1);
    }
    return ret;
}

LPCTSTR
GetEnvVarOrSpecial(LPCTSTR varName)
{
    static TCHAR ret[MAX_PATH];

    LPTSTR var = GetEnvVar(varName);
    if (var)
        return var;

    /* env var doesn't exist, look for a "special" one */
    /* %CD% */
    if (_tcsicmp(varName,_T("cd")) ==0)
    {
        GetCurrentDirectory(MAX_PATH, ret);
        return ret;
    }
    /* %TIME% */
    else if (_tcsicmp(varName,_T("time")) ==0)
    {
        return GetTimeString();
    }
    /* %DATE% */
    else if (_tcsicmp(varName,_T("date")) ==0)
    {
        return GetDateString();
    }

    /* %RANDOM% */
    else if (_tcsicmp(varName,_T("random")) ==0)
    {
        /* Get random number */
        _itot(rand(),ret,10);
        return ret;
    }

    /* %CMDCMDLINE% */
    else if (_tcsicmp(varName,_T("cmdcmdline")) ==0)
    {
        return GetCommandLine();
    }

    /* %CMDEXTVERSION% */
    else if (_tcsicmp(varName,_T("cmdextversion")) ==0)
    {
        /* Set version number to 2 */
        _itot(2,ret,10);
        return ret;
    }

    /* %ERRORLEVEL% */
    else if (_tcsicmp(varName,_T("errorlevel")) ==0)
    {
        _itot(nErrorLevel,ret,10);
        return ret;
    }

    return NULL;
}

/* Handle the %~var syntax */
static LPTSTR
GetEnhancedVar(TCHAR **pFormat, LPTSTR (*GetVar)(TCHAR, BOOL *))
{
    static const TCHAR ModifierTable[] = _T("dpnxfsatz");
    enum {
        M_DRIVE = 1,   /* D: drive letter */
        M_PATH  = 2,   /* P: path */
        M_NAME  = 4,   /* N: filename */
        M_EXT   = 8,   /* X: extension */
        M_FULL  = 16,  /* F: full path (drive+path+name+ext) */
        M_SHORT = 32,  /* S: full path (drive+path+name+ext), use short names */
        M_ATTR  = 64,  /* A: attributes */
        M_TIME  = 128, /* T: modification time */
        M_SIZE  = 256, /* Z: file size */
    } Modifiers = 0;

    TCHAR *Format, *FormatEnd;
    TCHAR *PathVarName = NULL;
    LPTSTR Variable;
    TCHAR *VarEnd;
    BOOL VariableIsParam0;
    TCHAR FullPath[MAX_PATH];
    TCHAR FixedPath[MAX_PATH], *Filename, *Extension;
    HANDLE hFind;
    WIN32_FIND_DATA w32fd;
    TCHAR *In, *Out;

    static TCHAR Result[CMDLINE_LENGTH];

    /* There is ambiguity between modifier characters and FOR variables;
     * the rule that cmd uses is to pick the longest possible match.
     * For example, if there is a %n variable, then out of %~anxnd,
     * %~anxn will be substituted rather than just %~an. */

    /* First, go through as many modifier characters as possible */
    FormatEnd = Format = *pFormat;
    while (*FormatEnd && _tcschr(ModifierTable, _totlower(*FormatEnd)))
        FormatEnd++;

    if (*FormatEnd == _T('$'))
    {
        /* $PATH: syntax */
        PathVarName = FormatEnd + 1;
        FormatEnd = _tcschr(PathVarName, _T(':'));
        if (!FormatEnd)
            return NULL;

        /* Must be immediately followed by the variable */
        Variable = GetVar(*++FormatEnd, &VariableIsParam0);
        if (!Variable)
            return NULL;
    }
    else
    {
        /* Backtrack if necessary to get a variable name match */
        while (!(Variable = GetVar(*FormatEnd, &VariableIsParam0)))
        {
            if (FormatEnd == Format)
                return NULL;
            FormatEnd--;
        }
    }

    for (; Format < FormatEnd && *Format != _T('$'); Format++)
        Modifiers |= 1 << (_tcschr(ModifierTable, _totlower(*Format)) - ModifierTable);

    *pFormat = FormatEnd + 1;

    /* Exclude the leading and trailing quotes */
    VarEnd = &Variable[_tcslen(Variable)];
    if (*Variable == _T('"'))
    {
        Variable++;
        if (VarEnd > Variable && VarEnd[-1] == _T('"'))
            VarEnd--;
    }

    if ((char *)VarEnd - (char *)Variable >= sizeof Result)
        return _T("");
    memcpy(Result, Variable, (char *)VarEnd - (char *)Variable);
    Result[VarEnd - Variable] = _T('\0');

    if (PathVarName)
    {
        /* $PATH: syntax - search the directories listed in the
         * specified environment variable for the file */
        LPTSTR PathVar;
        FormatEnd[-1] = _T('\0');
        PathVar = GetEnvVar(PathVarName);
        FormatEnd[-1] = _T(':');
        if (!PathVar ||
            !SearchPath(PathVar, Result, NULL, MAX_PATH, FullPath, NULL))
        {
            return _T("");
        }
    }
    else if (Modifiers == 0)
    {
        /* For plain %~var with no modifiers, just return the variable without quotes */
        return Result;
    }
    else if (VariableIsParam0)
    {
        /* Special case: If the variable is %0 and modifier characters are present,
         * use the batch file's path (which includes the .bat/.cmd extension)
         * rather than the actual %0 variable (which might not). */
        _tcscpy(FullPath, bc->BatchFilePath);
    }
    else
    {
        /* Convert the variable, now without quotes, to a full path */
        if (!GetFullPathName(Result, MAX_PATH, FullPath, NULL))
            return _T("");
    }

    /* Next step is to change the path to fix letter case (e.g.
     * C:\ReAcToS -> C:\ReactOS) and, if requested with the S modifier,
     * replace long filenames with short. */

    In = FullPath;
    Out = FixedPath;

    /* Copy drive letter */
    *Out++ = *In++;
    *Out++ = *In++;
    *Out++ = *In++;
    /* Loop over each \-separated component in the path */
    do {
        TCHAR *Next = _tcschr(In, _T('\\'));
        if (Next)
            *Next++ = _T('\0');
        /* Use FindFirstFile to get the correct name */
        if (Out + _tcslen(In) + 1 >= &FixedPath[MAX_PATH])
            return _T("");
        _tcscpy(Out, In);
        hFind = FindFirstFile(FixedPath, &w32fd);
        /* If it doesn't exist, just leave the name as it was given */
        if (hFind != INVALID_HANDLE_VALUE)
        {
            LPTSTR FixedComponent = w32fd.cFileName;
            if (*w32fd.cAlternateFileName &&
                ((Modifiers & M_SHORT) || !_tcsicmp(In, w32fd.cAlternateFileName)))
            {
                FixedComponent = w32fd.cAlternateFileName;
            }
            FindClose(hFind);

            if (Out + _tcslen(FixedComponent) + 1 >= &FixedPath[MAX_PATH])
                return _T("");
            _tcscpy(Out, FixedComponent);
        }
        Filename = Out;
        Out += _tcslen(Out);
        *Out++ = _T('\\');

        In = Next;
    } while (In != NULL);
    Out[-1] = _T('\0');

    /* Build the result string. Start with attributes, modification time, and
     * file size. If the file didn't exist, these fields will all be empty. */
    Out = Result;
    if (hFind != INVALID_HANDLE_VALUE)
    {
        if (Modifiers & M_ATTR)
        {
            static const struct {
                TCHAR Character;
                WORD  Value;
            } *Attrib, Table[] = {
                { _T('d'), FILE_ATTRIBUTE_DIRECTORY },
                { _T('r'), FILE_ATTRIBUTE_READONLY },
                { _T('a'), FILE_ATTRIBUTE_ARCHIVE },
                { _T('h'), FILE_ATTRIBUTE_HIDDEN },
                { _T('s'), FILE_ATTRIBUTE_SYSTEM },
                { _T('c'), FILE_ATTRIBUTE_COMPRESSED },
                { _T('o'), FILE_ATTRIBUTE_OFFLINE },
                { _T('t'), FILE_ATTRIBUTE_TEMPORARY },
                { _T('l'), FILE_ATTRIBUTE_REPARSE_POINT },
            };
            for (Attrib = Table; Attrib != &Table[9]; Attrib++)
            {
                *Out++ = w32fd.dwFileAttributes & Attrib->Value
                         ? Attrib->Character
                         : _T('-');
            }
            *Out++ = _T(' ');
        }
        if (Modifiers & M_TIME)
        {
            FILETIME ft;
            SYSTEMTIME st;
            FileTimeToLocalFileTime(&w32fd.ftLastWriteTime, &ft);
            FileTimeToSystemTime(&ft, &st);

            Out += FormatDate(Out, &st, TRUE);
            *Out++ = _T(' ');
            Out += FormatTime(Out, &st);
            *Out++ = _T(' ');
        }
        if (Modifiers & M_SIZE)
        {
            ULARGE_INTEGER Size;
            Size.LowPart = w32fd.nFileSizeLow;
            Size.HighPart = w32fd.nFileSizeHigh;
            Out += _stprintf(Out, _T("%I64u "), Size.QuadPart);
        }
    }

    /* When using the path-searching syntax or the S modifier,
     * at least part of the file path is always included.
     * If none of the DPNX modifiers are present, include the full path */
    if (PathVarName || (Modifiers & M_SHORT))
        if ((Modifiers & (M_DRIVE | M_PATH | M_NAME | M_EXT)) == 0)
            Modifiers |= M_FULL;

    /* Now add the requested parts of the name.
     * With the F modifier, add all parts to form the full path. */
    Extension = _tcsrchr(Filename, _T('.'));
    if (Modifiers & (M_DRIVE | M_FULL))
    {
        *Out++ = FixedPath[0];
        *Out++ = FixedPath[1];
    }
    if (Modifiers & (M_PATH | M_FULL))
    {
        memcpy(Out, &FixedPath[2], (char *)Filename - (char *)&FixedPath[2]);
        Out += Filename - &FixedPath[2];
    }
    if (Modifiers & (M_NAME | M_FULL))
    {
        while (*Filename && Filename != Extension)
            *Out++ = *Filename++;
    }
    if (Modifiers & (M_EXT | M_FULL))
    {
        if (Extension)
            Out = _stpcpy(Out, Extension);
    }

    /* Trim trailing space which otherwise would appear as a
     * result of using the A/T/Z modifiers but no others. */
    while (Out != &Result[0] && Out[-1] == _T(' '))
        Out--;
    *Out = _T('\0');

    return Result;
}

LPCTSTR
GetBatchVar(TCHAR *varName, UINT *varNameLen)
{
    LPCTSTR ret;
    TCHAR *varNameEnd;
    BOOL dummy;

    *varNameLen = 1;

    switch ( *varName )
    {
    case _T('~'):
        varNameEnd = varName + 1;
        ret = GetEnhancedVar(&varNameEnd, FindArg);
        if (!ret)
        {
            error_syntax(varName);
            return NULL;
        }
        *varNameLen = varNameEnd - varName;
        return ret;
    case _T('0'):
    case _T('1'):
    case _T('2'):
    case _T('3'):
    case _T('4'):
    case _T('5'):
    case _T('6'):
    case _T('7'):
    case _T('8'):
    case _T('9'):
        return FindArg(*varName, &dummy);

    case _T('*'):
        //
        // Copy over the raw params(not including the batch file name
        //
        return bc->raw_params;

    case _T('%'):
        return _T("%");
    }
    return NULL;
}

BOOL
SubstituteVars(TCHAR *Src, TCHAR *Dest, TCHAR Delim)
{
#define APPEND(From, Length) { \
    if (Dest + (Length) > DestEnd) \
        goto too_long; \
    memcpy(Dest, From, (Length) * sizeof(TCHAR)); \
    Dest += Length; }
#define APPEND1(Char) { \
    if (Dest >= DestEnd) \
        goto too_long; \
    *Dest++ = Char; }

    TCHAR *DestEnd = Dest + CMDLINE_LENGTH - 1;
    const TCHAR *Var;
    int VarLength;
    TCHAR *SubstStart;
    TCHAR EndChr;
    while (*Src)
    {
        if (*Src != Delim)
        {
            APPEND1(*Src++)
            continue;
        }

        Src++;
        if (bc && Delim == _T('%'))
        {
            UINT NameLen;
            Var = GetBatchVar(Src, &NameLen);
            if (Var != NULL)
            {
                VarLength = _tcslen(Var);
                APPEND(Var, VarLength)
                Src += NameLen;
                continue;
            }
        }

        /* Find the end of the variable name. A colon (:) will usually
         * end the name and begin the optional modifier, but not if it
         * is immediately followed by the delimiter (%VAR:%). */
        SubstStart = Src;
        while (*Src != Delim && !(*Src == _T(':') && Src[1] != Delim))
        {
            if (!*Src)
                goto bad_subst;
            Src++;
        }

        EndChr = *Src;
        *Src = _T('\0');
        Var = GetEnvVarOrSpecial(SubstStart);
        *Src++ = EndChr;
        if (Var == NULL)
        {
            /* In a batch file, %NONEXISTENT% "expands" to an empty string */
            if (bc)
                continue;
            goto bad_subst;
        }
        VarLength = _tcslen(Var);

        if (EndChr == Delim)
        {
            /* %VAR% - use as-is */
            APPEND(Var, VarLength)
        }
        else if (*Src == _T('~'))
        {
            /* %VAR:~[start][,length]% - substring
             * Negative values are offsets from the end */
            int Start = _tcstol(Src + 1, &Src, 0);
            int End = VarLength;
            if (Start < 0)
                Start += VarLength;
            Start = max(Start, 0);
            Start = min(Start, VarLength);
            if (*Src == _T(','))
            {
                End = _tcstol(Src + 1, &Src, 0);
                End += (End < 0) ? VarLength : Start;
                End = max(End, Start);
                End = min(End, VarLength);
            }
            if (*Src++ != Delim)
                goto bad_subst;
            APPEND(&Var[Start], End - Start);
        }
        else
        {
            /* %VAR:old=new% - replace all occurrences of old with new
             * %VAR:*old=new% - replace first occurrence only,
             *                  and remove everything before it */
            TCHAR *Old, *New;
            DWORD OldLength, NewLength;
            BOOL Star = FALSE;
            int LastMatch = 0, i = 0;

            if (*Src == _T('*'))
            {
                Star = TRUE;
                Src++;
            }

            /* the string to replace may contain the delimiter */
            Src = _tcschr(Old = Src, _T('='));
            if (Src == NULL)
                goto bad_subst;
            OldLength = Src++ - Old;
            if (OldLength == 0)
                goto bad_subst;

            Src = _tcschr(New = Src, Delim);
            if (Src == NULL)
                goto bad_subst;
            NewLength = Src++ - New;

            while (i < VarLength)
            {
                if (_tcsnicmp(&Var[i], Old, OldLength) == 0)
                {
                    if (!Star)
                        APPEND(&Var[LastMatch], i - LastMatch)
                    APPEND(New, NewLength)
                    i += OldLength;
                    LastMatch = i;
                    if (Star)
                        break;
                    continue;
                }
                i++;
            }
            APPEND(&Var[LastMatch], VarLength - LastMatch)
        }
        continue;

    bad_subst:
        Src = SubstStart;
        if (!bc)
            APPEND1(Delim)
    }
    *Dest = _T('\0');
    return TRUE;
too_long:
    ConOutResPrintf(STRING_ALIAS_ERROR);
    nErrorLevel = 9023;
    return FALSE;
#undef APPEND
#undef APPEND1
}

/* Search the list of FOR contexts for a variable */
static LPTSTR FindForVar(TCHAR Var, BOOL *IsParam0)
{
    FOR_CONTEXT *Ctx;
    *IsParam0 = FALSE;
    for (Ctx = fc; Ctx != NULL; Ctx = Ctx->prev)
    {
        if ((UINT)(Var - Ctx->firstvar) < Ctx->varcount)
            return Ctx->values[Var - Ctx->firstvar];
    }
    return NULL;
}

BOOL
SubstituteForVars(TCHAR *Src, TCHAR *Dest)
{
    TCHAR *DestEnd = &Dest[CMDLINE_LENGTH - 1];
    while (*Src)
    {
        if (Src[0] == _T('%'))
        {
            BOOL Dummy;
            LPTSTR End = &Src[2];
            LPTSTR Value = NULL;

            if (Src[1] == _T('~'))
                Value = GetEnhancedVar(&End, FindForVar);

            if (!Value)
                Value = FindForVar(Src[1], &Dummy);

            if (Value)
            {
                if (Dest + _tcslen(Value) > DestEnd)
                    return FALSE;
                Dest = _stpcpy(Dest, Value);
                Src = End;
                continue;
            }
        }
        /* Not a variable; just copy the character */
        if (Dest >= DestEnd)
            return FALSE;
        *Dest++ = *Src++;
    }
    *Dest = _T('\0');
    return TRUE;
}

LPTSTR
DoDelayedExpansion(LPTSTR Line)
{
    TCHAR Buf1[CMDLINE_LENGTH];
    TCHAR Buf2[CMDLINE_LENGTH];

    /* First, substitute FOR variables */
    if (!SubstituteForVars(Line, Buf1))
        return NULL;

    if (!bDelayedExpansion || !_tcschr(Buf1, _T('!')))
        return cmd_dup(Buf1);

    /* FIXME: Delayed substitutions actually aren't quite the same as
     * immediate substitutions. In particular, it's possible to escape
     * the exclamation point using ^. */
    if (!SubstituteVars(Buf1, Buf2, _T('!')))
        return NULL;
    return cmd_dup(Buf2);
}


/*
 * do the prompt/input/process loop
 *
 */

BOOL
ReadLine(TCHAR *commandline, BOOL bMore)
{
    TCHAR readline[CMDLINE_LENGTH];
    LPTSTR ip;

    /* if no batch input then... */
    if (bc == NULL)
    {
        if (bMore)
        {
            ConOutResPrintf(STRING_MORE);
        }
        else
        {
            /* JPP 19980807 - if echo off, don't print prompt */
            if (bEcho)
            {
                if (!bIgnoreEcho)
                    ConOutChar(_T('\n'));
                PrintPrompt();
            }
        }

        if (!ReadCommand(readline, CMDLINE_LENGTH - 1))
        {
            bExit = TRUE;
            return FALSE;
        }

        if (CheckCtrlBreak(BREAK_INPUT))
        {
            ConOutChar(_T('\n'));
            return FALSE;
        }
        ip = readline;
    }
    else
    {
        ip = ReadBatchLine();
        if (!ip)
            return FALSE;
    }

    return SubstituteVars(ip, commandline, _T('%'));
}

static VOID
ProcessInput(VOID)
{
    PARSED_COMMAND *Cmd;

    while (!bCanExit || !bExit)
    {
        Cmd = ParseCommand(NULL);
        if (!Cmd)
            continue;

        ExecuteCommand(Cmd);
        FreeCommand(Cmd);
    }
}


/*
 * control-break handler.
 */
BOOL WINAPI BreakHandler(DWORD dwCtrlType)
{
    DWORD           dwWritten;
    INPUT_RECORD    rec;
    static BOOL SelfGenerated = FALSE;

    if ((dwCtrlType != CTRL_C_EVENT) &&
        (dwCtrlType != CTRL_BREAK_EVENT))
    {
        return FALSE;
    }
    else
    {
        if (SelfGenerated)
        {
            SelfGenerated = FALSE;
            return TRUE;
        }
    }

    if (!TryEnterCriticalSection(&ChildProcessRunningLock))
    {
        SelfGenerated = TRUE;
        GenerateConsoleCtrlEvent (dwCtrlType, 0);
        return TRUE;
    }
    else
    {
        LeaveCriticalSection(&ChildProcessRunningLock);
    }

    rec.EventType = KEY_EVENT;
    rec.Event.KeyEvent.bKeyDown = TRUE;
    rec.Event.KeyEvent.wRepeatCount = 1;
    rec.Event.KeyEvent.wVirtualKeyCode = _T('C');
    rec.Event.KeyEvent.wVirtualScanCode = _T('C') - 35;
    rec.Event.KeyEvent.uChar.AsciiChar = _T('C');
    rec.Event.KeyEvent.uChar.UnicodeChar = _T('C');
    rec.Event.KeyEvent.dwControlKeyState = RIGHT_CTRL_PRESSED;

    WriteConsoleInput(ConStreamGetOSHandle(StdIn),
                      &rec,
                      1,
                      &dwWritten);

    bCtrlBreak = TRUE;
    /* FIXME: Handle batch files */

    //ConOutPrintf(_T("^C"));

    return TRUE;
}


VOID AddBreakHandler(VOID)
{
    SetConsoleCtrlHandler(BreakHandler, TRUE);
}


VOID RemoveBreakHandler(VOID)
{
    SetConsoleCtrlHandler(BreakHandler, FALSE);
}


/*
 * show commands and options that are available.
 *
 */
#if 0
static VOID
ShowCommands(VOID)
{
    /* print command list */
    ConOutResPuts(STRING_CMD_HELP1);
    PrintCommandList();

    /* print feature list */
    ConOutResPuts(STRING_CMD_HELP2);

#ifdef FEATURE_ALIASES
    ConOutResPuts(STRING_CMD_HELP3);
#endif
#ifdef FEATURE_HISTORY
    ConOutResPuts(STRING_CMD_HELP4);
#endif
#ifdef FEATURE_UNIX_FILENAME_COMPLETION
    ConOutResPuts(STRING_CMD_HELP5);
#endif
#ifdef FEATURE_DIRECTORY_STACK
    ConOutResPuts(STRING_CMD_HELP6);
#endif
#ifdef FEATURE_REDIRECTION
    ConOutResPuts(STRING_CMD_HELP7);
#endif
    ConOutChar(_T('\n'));
}
#endif


static VOID
LoadRegistrySettings(HKEY hKeyRoot)
{
    LONG lRet;
    HKEY hKey;
    DWORD dwType, len;
    /*
     * Buffer big enough to hold the string L"4294967295",
     * corresponding to the literal 0xFFFFFFFF (MAX_ULONG) in decimal.
     */
    DWORD Buffer[6];

    lRet = RegOpenKeyEx(hKeyRoot,
                        _T("Software\\Microsoft\\Command Processor"),
                        0,
                        KEY_QUERY_VALUE,
                        &hKey);
    if (lRet != ERROR_SUCCESS)
        return;

#ifdef INCLUDE_CMD_COLOR
    len = sizeof(Buffer);
    lRet = RegQueryValueEx(hKey,
                           _T("DefaultColor"),
                           NULL,
                           &dwType,
                           (LPBYTE)&Buffer,
                           &len);
    if (lRet == ERROR_SUCCESS)
    {
        /* Overwrite the default attributes */
        if (dwType == REG_DWORD)
            wDefColor = (WORD)*(PDWORD)Buffer;
        else if (dwType == REG_SZ)
            wDefColor = (WORD)_tcstol((PTSTR)Buffer, NULL, 0);
    }
    // else, use the default attributes retrieved before.
#endif

#if 0
    len = sizeof(Buffer);
    lRet = RegQueryValueEx(hKey,
                           _T("DisableUNCCheck"),
                           NULL,
                           &dwType,
                           (LPBYTE)&Buffer,
                           &len);
    if (lRet == ERROR_SUCCESS)
    {
        /* Overwrite the default setting */
        if (dwType == REG_DWORD)
            bDisableUNCCheck = !!*(PDWORD)Buffer;
        else if (dwType == REG_SZ)
            bDisableUNCCheck = (_ttol((PTSTR)Buffer) == 1);
    }
    // else, use the default setting set globally.
#endif

    len = sizeof(Buffer);
    lRet = RegQueryValueEx(hKey,
                           _T("DelayedExpansion"),
                           NULL,
                           &dwType,
                           (LPBYTE)&Buffer,
                           &len);
    if (lRet == ERROR_SUCCESS)
    {
        /* Overwrite the default setting */
        if (dwType == REG_DWORD)
            bDelayedExpansion = !!*(PDWORD)Buffer;
        else if (dwType == REG_SZ)
            bDelayedExpansion = (_ttol((PTSTR)Buffer) == 1);
    }
    // else, use the default setting set globally.

    len = sizeof(Buffer);
    lRet = RegQueryValueEx(hKey,
                           _T("EnableExtensions"),
                           NULL,
                           &dwType,
                           (LPBYTE)&Buffer,
                           &len);
    if (lRet == ERROR_SUCCESS)
    {
        /* Overwrite the default setting */
        if (dwType == REG_DWORD)
            bEnableExtensions = !!*(PDWORD)Buffer;
        else if (dwType == REG_SZ)
            bEnableExtensions = (_ttol((PTSTR)Buffer) == 1);
    }
    // else, use the default setting set globally.

    len = sizeof(Buffer);
    lRet = RegQueryValueEx(hKey,
                           _T("CompletionChar"),
                           NULL,
                           &dwType,
                           (LPBYTE)&Buffer,
                           &len);
    if (lRet == ERROR_SUCCESS)
    {
        /* Overwrite the default setting */
        if (dwType == REG_DWORD)
            AutoCompletionChar = (TCHAR)*(PDWORD)Buffer;
        else if (dwType == REG_SZ)
            AutoCompletionChar = (TCHAR)_tcstol((PTSTR)Buffer, NULL, 0);
    }
    // else, use the default setting set globally.

    /* Validity check */
    if (IS_COMPLETION_DISABLED(AutoCompletionChar))
    {
        /* Disable autocompletion */
        AutoCompletionChar = 0x20;
    }

    len = sizeof(Buffer);
    lRet = RegQueryValueEx(hKey,
                           _T("PathCompletionChar"),
                           NULL,
                           &dwType,
                           (LPBYTE)&Buffer,
                           &len);
    if (lRet == ERROR_SUCCESS)
    {
        /* Overwrite the default setting */
        if (dwType == REG_DWORD)
            PathCompletionChar = (TCHAR)*(PDWORD)Buffer;
        else if (dwType == REG_SZ)
            PathCompletionChar = (TCHAR)_tcstol((PTSTR)Buffer, NULL, 0);
    }
    // else, use the default setting set globally.

    /* Validity check */
    if (IS_COMPLETION_DISABLED(PathCompletionChar))
    {
        /* Disable autocompletion */
        PathCompletionChar = 0x20;
    }

    /* Adjust completion chars */
    if (PathCompletionChar >= 0x20 && AutoCompletionChar < 0x20)
        PathCompletionChar = AutoCompletionChar;
    else if (AutoCompletionChar >= 0x20 && PathCompletionChar < 0x20)
        AutoCompletionChar = PathCompletionChar;

    RegCloseKey(hKey);
}

static VOID
ExecuteAutoRunFile(HKEY hKeyRoot)
{
    LONG lRet;
    HKEY hKey;
    DWORD dwType, len;
    TCHAR AutoRun[2048];

    lRet = RegOpenKeyEx(hKeyRoot,
                        _T("Software\\Microsoft\\Command Processor"),
                        0,
                        KEY_QUERY_VALUE,
                        &hKey);
    if (lRet != ERROR_SUCCESS)
        return;

    len = sizeof(AutoRun);
    lRet = RegQueryValueEx(hKey,
                           _T("AutoRun"),
                           NULL,
                           &dwType,
                           (LPBYTE)&AutoRun,
                           &len);
    if ((lRet == ERROR_SUCCESS) && (dwType == REG_EXPAND_SZ || dwType == REG_SZ))
    {
        if (*AutoRun)
            ParseCommandLine(AutoRun);
    }

    RegCloseKey(hKey);
}

/* Get the command that comes after a /C or /K switch */
static VOID
GetCmdLineCommand(TCHAR *commandline, TCHAR *ptr, BOOL AlwaysStrip)
{
    TCHAR *LastQuote;

    while (_istspace(*ptr))
        ptr++;

    /* Remove leading quote, find final quote */
    if (*ptr == _T('"') &&
        (LastQuote = _tcsrchr(++ptr, _T('"'))) != NULL)
    {
        TCHAR *Space;
        /* Under certain circumstances, all quotes are preserved.
         * CMD /? documents these conditions as follows:
         *  1. No /S switch
         *  2. Exactly two quotes
         *  3. No "special characters" between the quotes
         *     (CMD /? says &<>()@^| but parentheses did not
         *     trigger this rule when I tested them.)
         *  4. Whitespace exists between the quotes
         *  5. Enclosed string is an executable filename
         */
        *LastQuote = _T('\0');
        for (Space = ptr + 1; Space < LastQuote; Space++)
        {
            if (_istspace(*Space))                         /* Rule 4 */
            {
                if (!AlwaysStrip &&                        /* Rule 1 */
                    !_tcspbrk(ptr, _T("\"&<>@^|")) &&      /* Rules 2, 3 */
                    SearchForExecutable(ptr, commandline)) /* Rule 5 */
                {
                    /* All conditions met: preserve both the quotes */
                    *LastQuote = _T('"');
                    _tcscpy(commandline, ptr - 1);
                    return;
                }
                break;
            }
        }

        /* The conditions were not met: remove both the
         * leading quote and the last quote */
        _tcscpy(commandline, ptr);
        _tcscpy(&commandline[LastQuote - ptr], LastQuote + 1);
        return;
    }

    /* No quotes; just copy */
    _tcscpy(commandline, ptr);
}


/*
 * Set up global initializations and process parameters
 */
static VOID
Initialize(VOID)
{
    HMODULE NtDllModule;
    TCHAR commandline[CMDLINE_LENGTH];
    TCHAR ModuleName[_MAX_PATH + 1];
    // INT nExitCode;

    HANDLE hIn, hOut;

    TCHAR *ptr, *cmdLine, option = 0;
    BOOL AlwaysStrip = FALSE;
    BOOL AutoRun = TRUE;

    /* Get version information */
    InitOSVersion();

    /* Some people like to run ReactOS cmd.exe on Win98, it helps in the
     * build process. So don't link implicitly against ntdll.dll, load it
     * dynamically instead */
    NtDllModule = GetModuleHandle(TEXT("ntdll.dll"));
    if (NtDllModule != NULL)
    {
        NtQueryInformationProcessPtr = (NtQueryInformationProcessProc)GetProcAddress(NtDllModule, "NtQueryInformationProcess");
        NtReadVirtualMemoryPtr = (NtReadVirtualMemoryProc)GetProcAddress(NtDllModule, "NtReadVirtualMemory");
    }

    /* Load the registry settings */
    LoadRegistrySettings(HKEY_LOCAL_MACHINE);
    LoadRegistrySettings(HKEY_CURRENT_USER);

    /* Initialize our locale */
    InitLocale();

    /* Initialize prompt support */
    InitPrompt();

#ifdef FEATURE_DIR_STACK
    /* Initialize directory stack */
    InitDirectoryStack();
#endif

#ifdef FEATURE_HISTORY
    /* Initialize history */
    InitHistory();
#endif

    /* Set COMSPEC environment variable */
    if (GetModuleFileName(NULL, ModuleName, ARRAYSIZE(ModuleName)) != 0)
    {
        ModuleName[_MAX_PATH] = _T('\0');
        SetEnvironmentVariable (_T("COMSPEC"), ModuleName);
    }

    /* Add ctrl break handler */
    AddBreakHandler();

    /* Set our default console mode */
    hOut = ConStreamGetOSHandle(StdOut);
    hIn  = ConStreamGetOSHandle(StdIn);
    SetConsoleMode(hOut, 0); // Reinitialize the console output mode
    SetConsoleMode(hOut, ENABLE_PROCESSED_OUTPUT | ENABLE_WRAP_AT_EOL_OUTPUT);
    SetConsoleMode(hIn , ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT);

    cmdLine = GetCommandLine();
    TRACE ("[command args: %s]\n", debugstr_aw(cmdLine));

    for (ptr = cmdLine; *ptr; ptr++)
    {
        if (*ptr == _T('/'))
        {
            option = _totupper(ptr[1]);
            if (option == _T('?'))
            {
                ConOutResPaging(TRUE,STRING_CMD_HELP8);
                nErrorLevel = 1;
                bExit = TRUE;
                return;
            }
            else if (option == _T('P'))
            {
                if (!IsExistingFile (_T("\\autoexec.bat")))
                {
#ifdef INCLUDE_CMD_DATE
                    cmd_date (_T(""));
#endif
#ifdef INCLUDE_CMD_TIME
                    cmd_time (_T(""));
#endif
                }
                else
                {
                    ParseCommandLine (_T("\\autoexec.bat"));
                }
                bCanExit = FALSE;
            }
            else if (option == _T('A'))
            {
                OutputStreamMode = AnsiText;
            }
            else if (option == _T('C') || option == _T('K') || option == _T('R'))
            {
                /* Remainder of command line is a command to be run */
                break;
            }
            else if (option == _T('D'))
            {
                AutoRun = FALSE;
            }
            else if (option == _T('Q'))
            {
                bDisableBatchEcho = TRUE;
            }
            else if (option == _T('S'))
            {
                AlwaysStrip = TRUE;
            }
#ifdef INCLUDE_CMD_COLOR
            else if (!_tcsnicmp(ptr, _T("/T:"), 3))
            {
                /* Process /T (color) argument; overwrite any previous settings */
                wDefColor = (WORD)_tcstoul(&ptr[3], &ptr, 16);
            }
#endif
            else if (option == _T('U'))
            {
                OutputStreamMode = UTF16Text;
            }
            else if (option == _T('V'))
            {
                // FIXME: Check validity of the parameter given to V !
                bDelayedExpansion = _tcsnicmp(&ptr[2], _T(":OFF"), 4);
            }
            else if (option == _T('E'))
            {
                // FIXME: Check validity of the parameter given to E !
                bEnableExtensions = _tcsnicmp(&ptr[2], _T(":OFF"), 4);
            }
            else if (option == _T('X'))
            {
                /* '/X' is identical to '/E:ON' */
                bEnableExtensions = TRUE;
            }
            else if (option == _T('Y'))
            {
                /* '/Y' is identical to '/E:OFF' */
                bEnableExtensions = FALSE;
            }
        }
    }

#ifdef INCLUDE_CMD_COLOR
    if (wDefColor == 0)
    {
        /*
         * If we still do not have the console colour attribute set,
         * retrieve the default one.
         */
        ConGetDefaultAttributes(&wDefColor);
    }

    if (wDefColor != 0)
        ConSetScreenColor(ConStreamGetOSHandle(StdOut), wDefColor, TRUE);
#endif

    /* Reset the output Standard Streams translation modes and codepage caches */
    // ConStreamSetMode(StdIn , OutputStreamMode, InputCodePage );
    ConStreamSetMode(StdOut, OutputStreamMode, OutputCodePage);
    ConStreamSetMode(StdErr, OutputStreamMode, OutputCodePage);

    if (!*ptr)
    {
        /* If neither /C or /K was given, display a simple version string */
        ConOutChar(_T('\n'));
        ConOutResPrintf(STRING_REACTOS_VERSION,
                        _T(KERNEL_VERSION_STR),
                        _T(KERNEL_VERSION_BUILD_STR));
        ConOutPuts(_T("(C) Copyright 1998-") _T(COPYRIGHT_YEAR) _T(" ReactOS Team.\n"));
    }

    if (AutoRun)
    {
        ExecuteAutoRunFile(HKEY_LOCAL_MACHINE);
        ExecuteAutoRunFile(HKEY_CURRENT_USER);
    }

    if (*ptr)
    {
        /* Do the /C or /K command */
        GetCmdLineCommand(commandline, &ptr[2], AlwaysStrip);
        bWaitForCommand = TRUE;
        /* nExitCode = */ ParseCommandLine(commandline);
        bWaitForCommand = FALSE;
        if (option != _T('K'))
        {
            // nErrorLevel = nExitCode;
            bExit = TRUE;
        }
    }
}


static VOID Cleanup(VOID)
{
    /* Run cmdexit.bat */
    if (IsExistingFile(_T("cmdexit.bat")))
    {
        ConErrResPuts(STRING_CMD_ERROR5);
        ParseCommandLine(_T("cmdexit.bat"));
    }
    else if (IsExistingFile(_T("\\cmdexit.bat")))
    {
        ConErrResPuts(STRING_CMD_ERROR5);
        ParseCommandLine(_T("\\cmdexit.bat"));
    }

#ifdef FEATURE_DIRECTORY_STACK
    /* Destroy directory stack */
    DestroyDirectoryStack();
#endif

#ifdef FEATURE_HISTORY
    CleanHistory();
#endif

    /* Free GetEnvVar's buffer */
    GetEnvVar(NULL);

    /* Remove ctrl break handler */
    RemoveBreakHandler();

    /* Restore the default console mode */
    SetConsoleMode(ConStreamGetOSHandle(StdIn),
                   ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT);
    SetConsoleMode(ConStreamGetOSHandle(StdOut),
                   ENABLE_PROCESSED_OUTPUT | ENABLE_WRAP_AT_EOL_OUTPUT);

    DeleteCriticalSection(&ChildProcessRunningLock);
}

/*
 * main function
 */
int _tmain(int argc, const TCHAR *argv[])
{
    TCHAR startPath[MAX_PATH];

    InitializeCriticalSection(&ChildProcessRunningLock);
    lpOriginalEnvironment = DuplicateEnvironment();

    GetCurrentDirectory(ARRAYSIZE(startPath), startPath);
    _tchdir(startPath);

    SetFileApisToOEM();
    InputCodePage  = GetConsoleCP();
    OutputCodePage = GetConsoleOutputCP();

    /* Initialize the Console Standard Streams */
    ConStreamInit(StdIn , GetStdHandle(STD_INPUT_HANDLE) , /*OutputStreamMode*/ AnsiText, InputCodePage);
    ConStreamInit(StdOut, GetStdHandle(STD_OUTPUT_HANDLE), OutputStreamMode, OutputCodePage);
    ConStreamInit(StdErr, GetStdHandle(STD_ERROR_HANDLE) , OutputStreamMode, OutputCodePage);

    CMD_ModuleHandle = GetModuleHandle(NULL);

    /* Perform general initialization, parse switches on command-line */
    Initialize();

    /* Call prompt routine */
    ProcessInput();

    /* Do the cleanup */
    Cleanup();

    cmd_free(lpOriginalEnvironment);

    cmd_exit(nErrorLevel);
    return nErrorLevel;
}

/* EOF */