reactos/rosapps/cmd/if.c

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/*
* IF.C - if internal batch command.
*
*
* History:
*
* 16 Jul 1998 (Hans B Pufal)
* started.
*
* 16 Jul 1998 (John P Price)
* Seperated commands into individual files.
*
* 27-Jul-1998 (John P Price <linux-guru@gcfl.net>)
* added config.h include
*
* 07-Jan-1999 (Eric Kohl <ekohl@abo.rhein-zeitung.de>)
* Added help text ("if /?") and cleaned up.
*
* 21-Jan-1999 (Eric Kohl <ekohl@abo.rhein-zeitung.de>)
* Unicode and redirection ready!
*
* 01-Sep-1999 (Eric Kohl <ekohl@abo.rhein-zeitung.de>)
* Fixed help text.
*
* 17-Feb-2001 (ea)
* IF DEFINED variable command
*/
#include "config.h"
#include <windows.h>
#include <tchar.h>
#include <string.h>
#include <ctype.h>
#include "cmd.h"
#include "batch.h"
#define X_EXEC 1
#define X_EMPTY 0x80
INT cmd_if (LPTSTR cmd, LPTSTR param)
{
INT x_flag = 0; /* when set cause 'then' clause to be executed */
LPTSTR pp;
#ifdef _DEBUG
DebugPrintf ("cmd_if: (\'%s\', \'%s\'\n", cmd, param);
#endif
if (!_tcsncmp (param, _T("/?"), 2))
{
ConOutPuts (_T("Performs conditional processing in batch programs.\n"
"\n"
" IF [NOT] ERRORLEVEL number command\n"
" IF [NOT] string1==string2 command\n"
" IF [NOT] EXIST filename command\n"
" IF [NOT] DEFINED variable command\n"
"\n"
"NOT Specifies that CMD should carry out the command only if\n"
" the condition is false\n"
"ERRORLEVEL number Specifies a true condition if the last program run returned\n"
" an exit code equal or greater than the number specified.\n"
"command Specifies the command to carry out if the condition is met.\n"
"string1==string2 Specifies a true condition if the specified text strings\n"
" match.\n"
"EXIST filename Specifies a true condition if the specified filename exists.\n"
"DEFINED variable Specifies a true condition if the specified variable is\n"
" defined."));
return 0;
}
/* First check if param string begins with word 'not' */
if (!_tcsnicmp (param, _T("not"), 3) && _istspace (*(param + 3)))
{
x_flag = X_EXEC; /* Remember 'NOT' */
param += 3; /* Step over 'NOT' */
while (_istspace (*param)) /* And subsequent spaces */
param++;
}
/* Check for 'exist' form */
if (!_tcsnicmp (param, _T("exist"), 5) && _istspace (*(param + 5)))
{
param += 5;
while (_istspace (*param))
param++;
pp = param;
while (*pp && !_istspace (*pp))
pp++;
if (*pp)
{
WIN32_FIND_DATA f;
HANDLE hFind;
*pp++ = _T('\0');
hFind = FindFirstFile (param, &f);
x_flag ^= (hFind == INVALID_HANDLE_VALUE) ? 0 : X_EXEC;
if (hFind != INVALID_HANDLE_VALUE)
{
FindClose (hFind);
}
}
else
return 0;
}
/* Check for 'defined' form */
else if (!_tcsnicmp (param, _T("defined"), 7) && _istspace (*(param + 7)))
{
TCHAR Value [1];
INT ValueSize = 0;
param += 7;
/* IF [NOT] DEFINED var COMMAND */
/* ^ */
while (_istspace (*param))
param++;
/* IF [NOT] DEFINED var COMMAND */
/* ^ */
pp = param;
while (*pp && !_istspace (*pp))
pp++;
/* IF [NOT] DEFINED var COMMAND */
/* ^ */
if (*pp)
{
*pp++ = _T('\0');
ValueSize = GetEnvironmentVariable(param, Value, sizeof Value);
x_flag ^= (0 == ValueSize)
? 0
: X_EXEC;
x_flag |= X_EMPTY;
}
else
return 0;
}
/* Check for 'errorlevel' form */
else if (!_tcsnicmp (param, _T("errorlevel"), 10) && _istspace (*(param + 10)))
{
INT n = 0;
pp = param + 10;
while (_istspace (*pp))
pp++;
while (_istdigit (*pp))
n = n * 10 + (*pp++ - _T('0'));
x_flag ^= (nErrorLevel < n) ? 0 : X_EXEC;
x_flag |= X_EMPTY; /* Syntax error if comd empty */
}
/* Check that '==' is present, syntax error if not */
else if (NULL == (pp = _tcsstr (param, _T("=="))))
{
error_syntax (NULL);
return 1;
}
else
{
/* Change first '='to space to terminate comparison loop */
*pp = _T(' '); /* Need a space to terminate comparison loop */
pp += 2; /* over '==' */
while (_istspace (*pp)) /* Skip subsequent spaces */
pp++;
_tcscat (pp, _T(" ")); /* Add one space to ensure comparison ends */
while (*param == *pp) /* Comparison loop */
{
if (_istspace (*param)) /* Terminates on space */
break;
param++, pp++;
}
if (x_flag ^= (*param != *pp) ? 0 : X_EXEC)
{
while (*pp && !_istspace (*pp)) /* Find first space, */
pp++;
x_flag |= X_EMPTY;
}
}
if (x_flag & X_EMPTY)
{
while (_istspace (*pp)) /* Then skip spaces */
pp++;
if (*pp == _T('\0')) /* If nothing left then syntax err */
{
error_syntax (NULL);
return 1;
}
}
if (x_flag & X_EXEC)
{
ParseCommandLine (pp);
}
return 0;
}