subsys/system/cmd/dirstack.c

   1 /*
   2  *  DIRSTACK.C - pushd / pop (directory stack) internal commands.
   3  *
   4  *
   5  *  History:
   6  *
   7  *    14-Dec-1998 (Eric Kohl <ekohl@abo.rhein-zeitung.de>)
   8  *        Implemented PUSHD and POPD command.
   9  *
  10  *    20-Jan-1999 (Eric Kohl <ekohl@abo.rhein-zeitung.de>)
  11  *        Unicode and redirection safe!
  12  *
  13  *    20-Jan-1999 (Eric Kohl <ekohl@abo.rhein-zeitung.de>)
  14  *        Added DIRS command.
  15  */
  16
  17 #include "config.h"
  18
  19 #ifdef FEATURE_DIRECTORY_STACK
  20
  21 #include <windows.h>
  22 #include <tchar.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25
  26 #include "cmd.h"
  27
  28
  29 typedef struct tagDIRENTRY
  30 {
  31         struct tagDIRENTRY *prev;
  32         struct tagDIRENTRY *next;
  33         LPTSTR pszPath;
  34 } DIRENTRY, *LPDIRENTRY;
  35
  36
  37 static INT nStackDepth;
  38 static LPDIRENTRY lpStackTop;
  39 static LPDIRENTRY lpStackBottom;
  40
  41
  42 static INT
  43 PushDirectory (LPTSTR pszPath)
  44 {
  45         LPDIRENTRY lpDir;
  46
  47         lpDir = (LPDIRENTRY)malloc (sizeof (DIRENTRY));
  48         if (!lpDir)
  49         {
  50                 error_out_of_memory ();
  51                 return -1;
  52         }
  53
  54         lpDir->prev = NULL;
  55         if (lpStackTop == NULL)
  56         {
  57                 lpDir->next = NULL;
  58                 lpStackBottom = lpDir;
  59         }
  60         else
  61         {
  62                 lpDir->next = lpStackTop;
  63                 lpStackTop->prev = lpDir;
  64         }
  65         lpStackTop = lpDir;
  66
  67         lpDir->pszPath = (LPTSTR)malloc ((_tcslen(pszPath)+1)*sizeof(TCHAR));
  68         if (!lpDir->pszPath)
  69         {
  70                 free (lpDir);
  71                 error_out_of_memory ();
  72                 return -1;
  73         }
  74
  75         _tcscpy (lpDir->pszPath, pszPath);
  76
  77         nStackDepth++;
  78
  79         return 0;
  80 }
  81
  82
  83 static VOID
  84 PopDirectory (VOID)
  85 {
  86         LPDIRENTRY lpDir;
  87
  88         if (nStackDepth == 0)
  89                 return;
  90
  91         lpDir = lpStackTop;
  92         lpStackTop = lpDir->next;
  93         if (lpStackTop != NULL)
  94                 lpStackTop->prev = NULL;
  95         else
  96                 lpStackBottom = NULL;
  97
  98         free (lpDir->pszPath);
  99         free (lpDir);
 100
 101         nStackDepth--;
 102 }
 103
 104
 105 static VOID
 106 GetDirectoryStackTop (LPTSTR pszPath)
 107 {
 108         if (lpStackTop)
 109                 _tcsncpy (pszPath, lpStackTop->pszPath, MAX_PATH);
 110         else
 111                 *pszPath = _T('\0');
 112 }
 113
 114
 115 /*
 116  * initialize directory stack
 117  */
 118 VOID InitDirectoryStack (VOID)
 119 {
 120         nStackDepth = 0;
 121         lpStackTop = NULL;
 122         lpStackBottom = NULL;
 123 }
 124
 125
 126 /*
 127  * destroy directory stack
 128  */
 129 VOID DestroyDirectoryStack (VOID)
 130 {
 131         while (nStackDepth)
 132                 PopDirectory ();
 133 }
 134
 135
 136 INT GetDirectoryStackDepth (VOID)
 137 {
 138         return nStackDepth;
 139 }
 140
 141
 142 /*
 143  * pushd command
 144  */
 145 INT CommandPushd (LPTSTR first, LPTSTR rest)
 146 {
 147         TCHAR curPath[MAX_PATH];
 148         TCHAR newPath[MAX_PATH];
 149         BOOL  bChangePath = FALSE;
 150
 151         if (!_tcsncmp (rest, _T("/?"), 2))
 152         {
 153                 ConOutPuts (_T("Stores the current directory for use by the POPD command, then\n"
 154                                "changes to the specified directory.\n\n"
 155                                "PUSHD [path | ..]\n\n"
 156                                "  path        Specifies the directory to make the current directory"));
 157                 return 0;
 158         }
 159
 160         if (rest[0] != _T('\0'))
 161         {
 162                 GetFullPathName (rest, MAX_PATH, newPath, NULL);
 163                 bChangePath = IsValidPathName (newPath);
 164         }
 165
 166         GetCurrentDirectory (MAX_PATH, curPath);
 167         if (PushDirectory (curPath))
 168                 return 0;
 169
 170         if (bChangePath)
 171                 SetCurrentDirectory (newPath);
 172
 173         return 0;
 174 }
 175
 176
 177 /*
 178  * popd command
 179  */
 180 INT CommandPopd (LPTSTR first, LPTSTR rest)
 181 {
 182         TCHAR szPath[MAX_PATH];
 183
 184         if (!_tcsncmp(rest, _T("/?"), 2))
 185         {
 186                 ConOutPuts (_T("Changes to the directory stored by the PUSHD command.\n\n"
 187                                "POPD"));
 188                 return 0;
 189         }
 190
 191         if (GetDirectoryStackDepth () == 0)
 192                 return 0;
 193
 194         GetDirectoryStackTop (szPath);
 195         PopDirectory ();
 196
 197         SetCurrentDirectory (szPath);
 198
 199         return 0;
 200 }
 201
 202
 203 /*
 204  * dirs command
 205  */
 206 INT CommandDirs (LPTSTR first, LPTSTR rest)
 207 {
 208         LPDIRENTRY lpDir;
 209
 210         if (!_tcsncmp(rest, _T("/?"), 2))
 211         {
 212                 ConOutPuts (_T("Prints the contents of the directory stack.\n"
 213                                "\n"
 214                                "DIRS"));
 215                 return 0;
 216         }
 217
 218
 219         lpDir = lpStackBottom;
 220
 221         if (lpDir == NULL)
 222         {
 223                 ConOutPuts (_T("Directory stack empty"));
 224                 return 0;
 225         }
 226
 227         while (lpDir != NULL)
 228         {
 229                 ConOutPuts (lpDir->pszPath);
 230
 231                 lpDir = lpDir->prev;
 232         }
 233
 234         return 0;
 235 }
 236
 237 #endif /* FEATURE_DIRECTORY_STACK */