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- /*
- * @(#)msd_dir.c 1.4 87/11/06 Public Domain.
- *
- * A public domain implementation of BSD directory routines for
- * MS-DOS. Written by Michael Rendell ({uunet,utai}michael@garfield),
- * August 1897
- *
- * Modified by Ian Stewartson, Data Logic (istewart@datlog.co.uk).
- *
- * Updates: 1. To support OS/2 1.x
- * 2. To support HPFS long filenames
- * 3. To support OS/2 2.x
- * 4. To support TurboC
- * 5. To support Windows NT
- */
-
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <stdio.h>
- #include <stdlib.h>
-
- #include <malloc.h>
-
- #include <string.h>
- #include <limits.h>
- #include <ctype.h>
- #include <errno.h>
- #include <dirent.h>
-
-
- #define WIN32_LEAN_AND_MEAN
- #include <windows.h>
-
- #define FILE_NAME_E cFileName
- #define OS_CloseFH(a) FindClose (a)
- #define FIND_BUFFER WIN32_FIND_DATA
- #define DISABLE_HARD_ERRORS SetErrorMode (0)
- #define ENABLE_HARD_ERRORS SetErrorMode (SEM_FAILCRITICALERRORS | \
- SEM_NOOPENFILEERRORBOX);
-
- # define ERROR_EMPTY_DIR ERROR_FILE_NOT_FOUND
-
- # define ATTRIBUTES (_A_SUBDIR | _A_HIDDEN | _A_SYSTEM | \
- _A_NORMAL | _A_RDONLY | _A_ARCH)
-
- /*
- * missing ??
- */
-
- #ifndef ENOTDIR
- # define ENOTDIR 120 /* Not a directory */
- #endif
-
- #ifndef S_IFMT
- # define S_IFMT 0xf000 /* type of file */
- #endif
-
- #ifndef S_ISDIR
- # define S_ISDIR(m) ((((m) & S_IFMT) == S_IFDIR))
- #endif
-
- /*
- * Internals
- */
-
- typedef struct _dircontents DIRCONT;
- static void free_dircontents (DIRCONT *);
-
- /*
- * Open the directory stream
- */
-
- DIR *
- opendir (name)
- const char *name;
- {
- struct stat statb;
- DIR *dirp;
- char *last;
- DIRCONT *dp;
- char *nbuf;
- int len = strlen (name);
- unsigned long rc;
- FIND_BUFFER dtabuf;
- HANDLE d_handle;
- bool HPFS = FALSE;
-
- if (!len)
- {
- errno = ENOTDIR;
- return (DIR *)NULL;
- }
-
- if ((nbuf = malloc (len + 5)) == (char *)NULL)
- return (DIR *) NULL;
-
- strcpy (nbuf, name);
- last = &nbuf[len - 1];
-
- /* Ok, DOS is very picky about its directory names. The following are
- * valid.
- *
- * c:/
- * c:.
- * c:name/name1
- *
- * c:name/ is not valid
- */
-
- if (((*last == '\\') || (*last == '/')) && (len > 1) &&
- (!((len == 3) && (name[1] == ':'))))
- *(last--) = 0;
-
- /* Check its a directory */
-
- DISABLE_HARD_ERRORS;
- rc = stat (nbuf, &statb);
- ENABLE_HARD_ERRORS;
-
- if (rc)
- {
- free (nbuf);
- return (DIR *) NULL;
- }
-
- if (!S_ISDIR (statb.st_mode))
- {
- free (nbuf);
- errno = ENOTDIR;
- return (DIR *)NULL;
- }
-
- if ((dirp = (DIR *) malloc (sizeof (DIR))) == (DIR *) NULL)
- {
- free (nbuf);
- return (DIR *) NULL;
- }
-
- /* Set up to find everything */
-
- if ((*last != '\\') && (*last != '/'))
- strcat (last, "/");
-
- strcat (last, "*.*");
-
- /* Find the file system type */
-
- HPFS = IsHPFSFileSystem (nbuf);
-
- dirp->dd_loc = 0;
- dirp->dd_cp = (DIRCONT *) NULL;
- dirp->dd_contents = (DIRCONT *) NULL;
-
- DISABLE_HARD_ERRORS;
-
- d_handle = FindFirstFile (nbuf, &dtabuf);
- rc = (d_handle == INVALID_HANDLE_VALUE) ? GetLastError () : 0;
-
- ENABLE_HARD_ERRORS;
-
- /* Check for errors */
-
- if (rc)
- {
- free (nbuf);
-
- /* Empty directory */
-
- #if defined (ERROR_EMPTY_DIR)
- if (rc == ERROR_EMPTY_DIR)
- return dirp;
- #endif
-
- free (dirp);
- return (DIR *) NULL;
- }
-
- /* Process the directory */
-
- do
- {
- if (((dp = (DIRCONT *) malloc (sizeof (DIRCONT))) == (DIRCONT *)NULL) ||
- ((dp->_d_entry = strdup (dtabuf.FILE_NAME_E)) == (char *) NULL))
- {
- if (dp->_d_entry != (char *)NULL)
- free ((char *)dp);
-
- free (nbuf);
- free_dircontents (dirp->dd_contents);
-
- OS_CloseFH (d_handle);
- return (DIR *) NULL;
- }
-
- if (!HPFS)
- strlwr (dp->_d_entry);
-
- if (dirp->dd_contents != (DIRCONT *) NULL)
- dirp->dd_cp = dirp->dd_cp->_d_next = dp;
-
- else
- dirp->dd_contents = dirp->dd_cp = dp;
-
- dp->_d_next = (DIRCONT *) NULL;
-
- } while (FindNextFile (d_handle, &dtabuf));
-
- dirp->dd_cp = dirp->dd_contents;
- free (nbuf);
-
- OS_CloseFH (d_handle);
- return dirp;
- }
-
-
- /*
- * Close the directory stream
- */
-
- int
- closedir (dirp)
- DIR *dirp;
- {
- if (dirp != (DIR *)NULL)
- {
- free_dircontents (dirp->dd_contents);
- free ((char *)dirp);
- }
-
- return 0;
- }
-
- /*
- * Read the next record from the stream
- */
-
- struct dirent *
- readdir (dirp)
- DIR *dirp;
- {
- static struct dirent dp;
-
- if ((dirp == (DIR *)NULL) || (dirp->dd_cp == (DIRCONT *) NULL))
- return (struct dirent *) NULL;
-
- dp.d_reclen = strlen (strcpy (dp.d_name, dirp->dd_cp->_d_entry));
- dp.d_off = dirp->dd_loc * 32;
- dp.d_ino = (ino_t)++dirp->dd_loc;
- dirp->dd_cp = dirp->dd_cp->_d_next;
-
- return &dp;
- }
-
- /*
- * Restart the directory stream
- */
-
- void
- rewinddir (dirp)
- DIR *dirp;
- {
- seekdir (dirp, (off_t)0);
- }
-
- /*
- * Move to a know position in the stream
- */
-
- void
- seekdir (dirp, off)
- DIR *dirp;
- off_t off;
- {
- long i = off;
- DIRCONT *dp;
-
- if ((dirp == (DIR *)NULL) || (off < 0L))
- return;
-
- for (dp = dirp->dd_contents; (--i >= 0) && (dp != (DIRCONT *)NULL);
- dp = dp->_d_next)
- ;
-
- dirp->dd_loc = off - (i + 1);
- dirp->dd_cp = dp;
- }
-
- /*
- * Get the current position
- */
-
- off_t
- telldir(dirp)
- DIR *dirp;
- {
- return (dirp == (DIR *)NULL) ? (off_t) -1 : dirp->dd_loc;
- }
-
- /*
- * Release the internal structure
- */
-
- static void
- free_dircontents (dp)
- DIRCONT *dp;
- {
- DIRCONT *odp;
-
- while ((odp = dp) != (DIRCONT *)NULL)
- {
- if (dp->_d_entry != (char *)NULL)
- free (dp->_d_entry);
-
- dp = dp->_d_next;
- free ((char *)odp);
- }
- }
-
-
- /*
- * Windows NT version
- */
-
- bool
- IsHPFSFileSystem (directory)
- char *directory;
- {
- char bName[4];
- DWORD flags;
- DWORD maxname;
- BOOL rc;
- unsigned int nDrive;
- char szCurDir [MAX_PATH];
-
- if (isalpha (directory[0]) && (directory[1] == ':'))
- nDrive = toupper (directory[0]) - '@';
-
- else
- {
- GetCurrentDirectory (MAX_PATH, szCurDir);
- nDrive = szCurDir[0] - 'A' + 1;
- }
-
- /* Set up the drive name */
-
- strcpy (bName, "x:\\");
- bName[0] = (char) (nDrive + '@');
-
- /* Read the volume info, if we fail - assume non-HPFS */
-
- DISABLE_HARD_ERRORS;
-
- rc = GetVolumeInformation (bName, (LPTSTR)NULL, 0, (LPDWORD)NULL,
- &maxname, &flags, (LPTSTR)NULL, 0);
- ENABLE_HARD_ERRORS;
-
- return ((rc) && (flags & (FS_CASE_SENSITIVE | FS_CASE_IS_PRESERVED)))
- ? TRUE : FALSE;
- }
-
-