--- /dev/null
+/*
+ * 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;
+}
git://git.jankratochvil.net / reactos.git / blobdiff