reactos/base/shell/cmd/alias.c

/*
 *  ALIAS.C - alias administration module.
 *
 *
 *  History:
 *
 *    02/02/1996 (Oliver Mueller)
 *        started.
 *
 *    02/03/1996 (Oliver Mueller)
 *        Added sorting algorithm and case sensitive substitution by using
 *        partstrupr().
 *
 *    27 Jul 1998  John P. Price
 *        added config.h include
 *        added ifdef's to disable aliases
 *
 *    09-Dec-1998 Eric Kohl
 *        Fixed crash when removing an alias in DeleteAlias().
 *        Added help text ("/?").
 *
 *    14-Jan-1998 Eric Kohl
 *        Clean up and Unicode safe!
 *
 *    24-Jan-1998 Eric Kohl
 *        Redirection safe!
 *
 *    02-Apr-2005 (Magnus Olsen <magnus@greatlord.com>)
 *        Remove all hardcoded strings in En.rc
 *
 *    02-Feb-2008 (Christoph von Wittich <christoph_vw@reactos.org>)
 *        rewrote alias handling for doskey compat
  */


#include "precomp.h"

#ifdef FEATURE_ALIASES

/* module internal functions */
/* strlwr only for first word in string */
static VOID
partstrlwr (LPTSTR str)
{
    LPTSTR c = str;
    while (*c && !_istspace (*c) && *c != _T('='))
    {
        *c = _totlower (*c);
        c++;
    }
}

static VOID
PrintAlias (VOID)
{
    LPTSTR Aliases;
    LPTSTR ptr;
    DWORD len;

    len = GetConsoleAliasesLength(_T("cmd.exe"));
    if (len == 0)
        return;

    /* allocate memory for an extra \0 char to make parsing easier */
    ptr = cmd_alloc(len + sizeof(TCHAR));
    if (!ptr)
    {
        WARN("Cannot allocate memory for ptr!\n");
        return;
    }

    Aliases = ptr;

    ZeroMemory(Aliases, len + sizeof(TCHAR));

    if (GetConsoleAliases(Aliases, len, _T("cmd.exe")) != 0)
    {
        while (*Aliases != '\0')
        {
            ConOutPrintf(_T("%s\n"), Aliases);
            Aliases = Aliases + lstrlen(Aliases);
            Aliases++;
        }
    }
    cmd_free(ptr);
}

/* specified routines */
VOID ExpandAlias (LPTSTR cmd, INT maxlen)
{
    LPTSTR buffer;
    TCHAR *position, *in, *out;
    LPTSTR Token;
    LPTSTR tmp;

    tmp = cmd_dup(cmd);
    if (!tmp)
        return;

    /* first part is the macro name */
    position = tmp + _tcscspn(tmp, _T(" \n"));
    if (position == tmp)
    {
        cmd_free(tmp);
        return;
    }
    *position++ = _T('\0');
    position += _tcsspn(position, _T(" "));

    buffer = cmd_alloc(maxlen);
    if (!buffer)
    {
        WARN("Cannot allocate memory for alias buffer!\n");
        cmd_free(tmp);
        return;
    }

    if (GetConsoleAlias(tmp, buffer, maxlen, _T("cmd.exe")) == 0)
    {
        cmd_free(tmp);
        cmd_free(buffer);
        return;
    }

    in = buffer;
    out = cmd;
    while (*in)
    {
        if (*in == _T('$'))
        {
            Token = position;
            if (in[1] >= _T('1') && in[1] <= _T('9'))
            {
                /* Copy a single space-delimited token from the input line */
                INT num;
                for (num = in[1] - _T('1'); num > 0; num--)
                {
                    Token += _tcscspn(Token, _T(" \n"));
                    Token += _tcsspn(Token, _T(" "));
                }
                while (!_tcschr(_T(" \n"), *Token))
                {
                    if (out >= &cmd[maxlen - 1])
                        break;
                    *out++ = *Token++;
                }
                in += 2;
                continue;
            }
            else if (in[1] == _T('*'))
            {
                /* Copy the entire remainder of the line */
                while (*Token && *Token != _T('\n'))
                {
                    if (out >= &cmd[maxlen - 1])
                        break;
                    *out++ = *Token++;
                }
                in += 2;
                continue;
            }
        }
        if (out >= &cmd[maxlen - 1])
            break;
        *out++ = *in++;
    }
    *out++ = _T('\n');
    *out = _T('\0');

    cmd_free(buffer);
    cmd_free(tmp);
}

INT CommandAlias (LPTSTR param)
{
    LPTSTR ptr;

    if (!_tcsncmp (param, _T("/?"), 2))
    {
        ConOutResPaging(TRUE,STRING_ALIAS_HELP);
        return 0;
    }

    nErrorLevel = 0;

    if (param[0] == _T('\0'))
    {
        PrintAlias ();
        return 0;
    }

    nErrorLevel = 0;

    /* error if no '=' found */
    if ((ptr = _tcschr (param, _T('='))) == 0)
    {
        nErrorLevel = 1;
        return 1;
    }

    /* Split rest into name and substitute */
    *ptr++ = _T('\0');

    partstrlwr (param);

    if (ptr[0] == _T('\0'))
        AddConsoleAlias(param, NULL, _T("cmd.exe"));
    else
        AddConsoleAlias(param, ptr, _T("cmd.exe"));

    return 0;
}
#endif