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183 lines
2.8 KiB
C
183 lines
2.8 KiB
C
/*
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* DIRSTACK.C - pushd / pop (directory stack) internal commands.
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*
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*
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* History:
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*
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* 14-Dec-1998 (Eric Kohl)
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* Implemented PUSHD and POPD command.
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*
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* 20-Jan-1999 (Eric Kohl)
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* Unicode and redirection safe!
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*
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* 20-Jan-1999 (Eric Kohl)
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* Added DIRS command.
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*/
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#include "precomp.h"
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#ifdef FEATURE_DIRECTORY_STACK
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typedef struct tagDIRENTRY
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{
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struct tagDIRENTRY *prev;
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struct tagDIRENTRY *next;
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TCHAR szPath[1];
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} DIRENTRY, *LPDIRENTRY;
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static INT nStackDepth;
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static LPDIRENTRY lpStackTop;
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static LPDIRENTRY lpStackBottom;
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static INT
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PushDirectory (LPTSTR pszPath)
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{
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LPDIRENTRY lpDir = cmd_alloc(FIELD_OFFSET(DIRENTRY, szPath[_tcslen(pszPath) + 1]));
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if (!lpDir)
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{
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error_out_of_memory ();
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return -1;
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}
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lpDir->prev = NULL;
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lpDir->next = lpStackTop;
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if (lpStackTop == NULL)
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lpStackBottom = lpDir;
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else
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lpStackTop->prev = lpDir;
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lpStackTop = lpDir;
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_tcscpy(lpDir->szPath, pszPath);
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nStackDepth++;
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return nErrorLevel = 0;
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}
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static VOID
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PopDirectory (VOID)
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{
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LPDIRENTRY lpDir = lpStackTop;
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lpStackTop = lpDir->next;
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if (lpStackTop != NULL)
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lpStackTop->prev = NULL;
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else
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lpStackBottom = NULL;
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cmd_free (lpDir);
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nStackDepth--;
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}
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/*
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* initialize directory stack
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*/
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VOID InitDirectoryStack (VOID)
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{
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nStackDepth = 0;
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lpStackTop = NULL;
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lpStackBottom = NULL;
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}
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/*
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* destroy directory stack
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*/
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VOID DestroyDirectoryStack (VOID)
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{
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while (nStackDepth)
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PopDirectory ();
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}
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INT GetDirectoryStackDepth (VOID)
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{
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return nStackDepth;
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}
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/*
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* pushd command
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*/
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INT CommandPushd (LPTSTR rest)
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{
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TCHAR curPath[MAX_PATH];
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if (!_tcsncmp (rest, _T("/?"), 2))
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{
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ConOutResPuts(STRING_DIRSTACK_HELP1);
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return 0;
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}
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GetCurrentDirectory (MAX_PATH, curPath);
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if (rest[0] != _T('\0'))
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{
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if (!SetRootPath(NULL, rest))
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return 1;
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}
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return PushDirectory(curPath);
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}
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/*
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* popd command
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*/
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INT CommandPopd (LPTSTR rest)
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{
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INT ret = 0;
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if (!_tcsncmp(rest, _T("/?"), 2))
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{
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ConOutResPuts(STRING_DIRSTACK_HELP2);
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return 0;
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}
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if (nStackDepth == 0)
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return 1;
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ret = _tchdir(lpStackTop->szPath) != 0;
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PopDirectory ();
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return ret;
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}
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/*
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* dirs command
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*/
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INT CommandDirs (LPTSTR rest)
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{
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LPDIRENTRY lpDir;
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if (!_tcsncmp(rest, _T("/?"), 2))
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{
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ConOutResPuts(STRING_DIRSTACK_HELP3);
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return 0;
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}
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nErrorLevel = 0;
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lpDir = lpStackBottom;
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if (lpDir == NULL)
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{
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ConOutResPuts(STRING_DIRSTACK_HELP4);
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return 0;
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}
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while (lpDir != NULL)
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{
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ConOutPuts(lpDir->szPath);
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lpDir = lpDir->prev;
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}
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return 0;
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}
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#endif /* FEATURE_DIRECTORY_STACK */
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