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450 lines
8.8 KiB
C
450 lines
8.8 KiB
C
/* $Id: batch.c,v 1.4 2001/02/28 22:33:23 ekohl Exp $
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*
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* BATCH.C - batch file processor for CMD.EXE.
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*
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*
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* History:
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*
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* ??/??/?? (Evan Jeffrey)
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* started.
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*
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* 15 Jul 1995 (Tim Norman)
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* modes and bugfixes.
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*
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* 08 Aug 1995 (Matt Rains)
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* i have cleaned up the source code. changes now bring this
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* source into guidelines for recommended programming practice.
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*
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* i have added some constants to help making changes easier.
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*
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* 29 Jan 1996 (Steffan Kaiser)
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* made a few cosmetic changes
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*
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* 05 Feb 1996 (Tim Norman)
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* changed to comply with new first/rest calling scheme
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*
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* 14 Jun 1997 (Steffen Kaiser)
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* bug fixes. added error level expansion %?. ctrl-break handling
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*
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* 16 Jul 1998 (Hans B Pufal)
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* Totally reorganised in conjunction with COMMAND.C (cf) to
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* implement proper BATCH file nesting and other improvements.
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*
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* 16 Jul 1998 (John P Price <linux-guru@gcfl.net>)
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* Seperated commands into individual files.
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*
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* 19 Jul 1998 (Hans B Pufal) [HBP_001]
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* Preserve state of echo flag across batch calls.
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*
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* 19 Jul 1998 (Hans B Pufal) [HBP_002]
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* Implementation of FOR command
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*
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* 20-Jul-1998 (John P Price <linux-guru@gcfl.net>)
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* added error checking after malloc calls
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*
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* 27-Jul-1998 (John P Price <linux-guru@gcfl.net>)
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* added config.h include
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*
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* 02-Aug-1998 (Hans B Pufal) [HBP_003]
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* Fixed bug in ECHO flag restoration at exit from batch file
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*
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* 26-Jan-1999 (Eric Kohl <ekohl@abo.rhein-zeitung.de>)
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* Replaced CRT io functions by Win32 io functions.
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* Unicode safe!
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*
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* 23-Feb-2001 (Carl Nettelblad <cnettel@hem.passagen.es>)
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* Fixes made to get "for" working.
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*/
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#include "config.h"
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#include <windows.h>
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#include <tchar.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "cmd.h"
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#include "batch.h"
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/* The stack of current batch contexts.
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* NULL when no batch is active
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*/
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LPBATCH_CONTEXT bc = NULL;
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BOOL bEcho = TRUE; /* The echo flag */
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/* Buffer for reading Batch file lines */
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TCHAR textline[BATCH_BUFFSIZE];
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/*
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* Returns a pointer to the n'th parameter of the current batch file.
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* If no such parameter exists returns pointer to empty string.
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* If no batch file is current, returns NULL
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*
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*/
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LPTSTR FindArg (INT n)
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{
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LPTSTR pp;
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#ifdef _DEBUG
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DebugPrintf ("FindArg: (%d)\n", n);
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#endif
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if (bc == NULL)
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return NULL;
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n += bc->shiftlevel;
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pp = bc->params;
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/* Step up the strings till we reach the end */
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/* or the one we want */
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while (*pp && n--)
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pp += _tcslen (pp) + 1;
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return pp;
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}
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/*
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* Batch_params builds a parameter list in newlay allocated memory.
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* The parameters consist of null terminated strings with a final
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* NULL character signalling the end of the parameters.
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*
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*/
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LPTSTR BatchParams (LPTSTR s1, LPTSTR s2)
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{
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LPTSTR dp = (LPTSTR)malloc ((_tcslen(s1) + _tcslen(s2) + 3) * sizeof (TCHAR));
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/* JPP 20-Jul-1998 added error checking */
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if (dp == NULL)
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{
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error_out_of_memory();
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return NULL;
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}
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if (s1 && *s1)
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{
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s1 = stpcpy (dp, s1);
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*s1++ = _T('\0');
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}
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else
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s1 = dp;
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while (*s2)
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{
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if (_istspace (*s2) || _tcschr (_T(",;"), *s2))
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{
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*s1++ = _T('\0');
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s2++;
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while (*s2 && _tcschr (_T(" ,;"), *s2))
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s2++;
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continue;
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}
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if ((*s2 == _T('"')) || (*s2 == _T('\'')))
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{
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TCHAR st = *s2;
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do
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*s1++ = *s2++;
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while (*s2 && (*s2 != st));
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}
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*s1++ = *s2++;
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}
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*s1++ = _T('\0');
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*s1 = _T('\0');
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return dp;
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}
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/*
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* If a batch file is current, exits it, freeing the context block and
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* chaining back to the previous one.
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*
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* If no new batch context is found, sets ECHO back ON.
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*
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* If the parameter is non-null or not empty, it is printed as an exit
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* message
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*/
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VOID ExitBatch (LPTSTR msg)
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{
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#ifdef _DEBUG
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DebugPrintf ("ExitBatch: (\'%s\')\n", msg);
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#endif
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if (bc != NULL)
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{
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LPBATCH_CONTEXT t = bc;
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if (bc->hBatchFile)
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{
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CloseHandle (bc->hBatchFile);
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bc->hBatchFile = INVALID_HANDLE_VALUE;
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}
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if (bc->params)
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free(bc->params);
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if (bc->forproto)
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free(bc->forproto);
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if (bc->ffind)
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free(bc->ffind);
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/* Preserve echo state across batch calls */
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bEcho = bc->bEcho;
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bc = bc->prev;
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free(t);
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}
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if (msg && *msg)
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ConOutPrintf ("%s\n", msg);
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}
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/*
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* Start batch file execution
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*
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* The firstword parameter is the full filename of the batch file.
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*
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*/
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BOOL Batch (LPTSTR fullname, LPTSTR firstword, LPTSTR param)
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{
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HANDLE hFile;
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hFile = CreateFile (fullname, GENERIC_READ, FILE_SHARE_READ, NULL,
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OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL |
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FILE_FLAG_SEQUENTIAL_SCAN, NULL);
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#ifdef _DEBUG
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DebugPrintf ("Batch: (\'%s\', \'%s\', \'%s\') hFile = %x\n",
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fullname, firstword, param, hFile);
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#endif
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if (hFile == INVALID_HANDLE_VALUE)
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{
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ConErrPrintf (_T("Error opening batch file\n"));
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return FALSE;
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}
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/* Kill any and all FOR contexts */
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while (bc && bc->forvar)
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ExitBatch (NULL);
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if (bc == NULL)
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{
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/* No curent batch file, create a new context */
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LPBATCH_CONTEXT n = (LPBATCH_CONTEXT)malloc (sizeof(BATCH_CONTEXT));
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if (n == NULL)
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{
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error_out_of_memory ();
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return FALSE;
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}
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n->prev = bc;
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bc = n;
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}
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else if (bc->hBatchFile != INVALID_HANDLE_VALUE)
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{
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/* Then we are transferring to another batch */
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CloseHandle (bc->hBatchFile);
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bc->hBatchFile = INVALID_HANDLE_VALUE;
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free (bc->params);
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}
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bc->hBatchFile = hFile;
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bc->bEcho = bEcho; /* Preserve echo across batch calls */
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bc->shiftlevel = 0;
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bc->ffind = NULL;
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bc->forvar = _T('\0');
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bc->forproto = NULL;
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bc->params = BatchParams (firstword, param);
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#ifdef _DEBUG
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DebugPrintf ("Batch: returns TRUE\n");
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#endif
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return TRUE;
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}
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/*
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* Read and return the next executable line form the current batch file
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*
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* If no batch file is current or no further executable lines are found
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* return NULL.
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*
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* Here we also look out for FOR bcontext structures which trigger the
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* FOR expansion code.
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*
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* Set eflag to 0 if line is not to be echoed else 1
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*/
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LPTSTR ReadBatchLine (LPBOOL bLocalEcho)
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{
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LPTSTR first;
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LPTSTR ip;
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/* No batch */
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if (bc == NULL)
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return NULL;
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#ifdef _DEBUG
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DebugPrintf ("ReadBatchLine ()\n");
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#endif
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while (1)
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{
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/* User halt */
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if (CheckCtrlBreak (BREAK_BATCHFILE))
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{
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while (bc)
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ExitBatch (NULL);
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return NULL;
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}
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/* No batch */
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if (bc == NULL)
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return NULL;
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/* If its a FOR context... */
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if (bc->forvar)
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{
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LPTSTR sp = bc->forproto; /* pointer to prototype command */
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LPTSTR dp = textline; /* Place to expand protoype */
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LPTSTR fv = FindArg (0); /* Next list element */
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/* End of list so... */
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if ((fv == NULL) || (*fv == _T('\0')))
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{
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/* just exit this context */
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ExitBatch (NULL);
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continue;
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}
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if (_tcscspn (fv, _T("?*")) == _tcslen (fv))
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{
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/* element is wild file */
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bc->shiftlevel++; /* No use it and shift list */
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}
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else
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{
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/* Wild file spec, find first (or next) file name */
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if (bc->ffind)
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{
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/* First already done so do next */
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fv = FindNextFile (bc->hFind, bc->ffind) ? bc->ffind->cFileName : NULL;
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}
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else
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{
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/* For first find, allocate a find first block */
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if ((bc->ffind = (LPWIN32_FIND_DATA)malloc (sizeof (WIN32_FIND_DATA))) == NULL)
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{
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error_out_of_memory();
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return NULL;
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}
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bc->hFind = FindFirstFile (fv, bc->ffind);
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fv = !(bc->hFind==INVALID_HANDLE_VALUE) ? bc->ffind->cFileName : NULL;
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}
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if (fv == NULL)
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{
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/* Null indicates no more files.. */
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free (bc->ffind); /* free the buffer */
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bc->ffind = NULL;
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bc->shiftlevel++; /* On to next list element */
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continue;
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}
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}
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/* At this point, fv points to parameter string */
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while (*sp)
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{
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if ((*sp == _T('%')) && (*(sp + 1) == bc->forvar))
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{
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/* replace % var */
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dp = stpcpy (dp, fv);
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sp += 2;
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}
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else
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{
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/* Else just copy */
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*dp++ = *sp++;
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}
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}
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*dp = _T('\0');
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*bLocalEcho = bEcho;
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return textline;
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}
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if (!FileGetString (bc->hBatchFile, textline, sizeof (textline)))
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{
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#ifdef _DEBUG
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DebugPrintf (_T("ReadBatchLine(): Reached EOF!\n"));
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#endif
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/* End of file.... */
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ExitBatch (NULL);
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if (bc == NULL)
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return NULL;
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continue;
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}
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#ifdef _DEBUG
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DebugPrintf (_T("ReadBatchLine(): textline: \'%s\'\n"), textline);
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#endif
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/* Strip leading spaces and trailing space/control chars */
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for (first = textline; _istspace (*first); first++)
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;
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for (ip = first + _tcslen (first) - 1; _istspace (*ip) || _istcntrl (*ip); ip--)
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;
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*++ip = _T('\0');
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/* ignore labels and empty lines */
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if (*first == _T(':') || *first == 0)
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continue;
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if (*first == _T('@'))
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{
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/* don't echo this line */
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do
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first++;
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while (_istspace (*first));
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*bLocalEcho = 0;
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}
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else
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*bLocalEcho = bEcho;
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break;
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}
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return first;
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}
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/* EOF */
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