home *** CD-ROM | disk | FTP | other *** search
- /*
- * @(#)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.
- */
-
- #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>
- #ifdef OS2
- #define INCL_DOSFILEMGR
- #include <os2.h>
- #else
- #include <dos.h>
- #endif
-
- #ifdef OS2
- # define ATTRIBUTES (FILE_DIRECTORY | FILE_HIDDEN | FILE_SYSTEM | \
- FILE_NORMAL | FILE_READONLY | FILE_ARCHIVED)
- #else
- # define ATTRIBUTES (_A_SUBDIR | _A_HIDDEN | _A_SYSTEM | \
- _A_NORMAL | _A_RDONLY | _A_ARCH)
- #endif
-
- typedef struct _dircontents DIRCONT;
- static void free_dircontents (DIRCONT *);
-
- DIR *opendir (name)
- const char *name;
- {
- struct stat statb;
- DIR *dirp;
- char *last;
- DIRCONT *dp;
- char *nbuf;
- #ifdef OS2
- FILEFINDBUF dtabuf;
- HDIR d_handle = HDIR_SYSTEM;
- USHORT d_count = 1;
- bool HPFS = FALSE;
- #else
- struct find_t dtabuf;
- #endif
- int len = strlen (name);
-
- 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 */
-
- if (stat (nbuf, &statb) < 0)
- {
- 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, "*.*");
-
- /* For OS/2, find the file system type */
-
- #ifdef OS2
- HPFS = IsHPFSFileSystem (nbuf);
- #endif
-
- dirp->dd_loc = 0;
- dirp->dd_cp = (DIRCONT *) NULL;
- dirp->dd_contents = (DIRCONT *) NULL;
-
- #ifdef OS2
- if (DosFindFirst (nbuf, &d_handle, ATTRIBUTES, &dtabuf,
- sizeof (FILEFINDBUF), &d_count, (ULONG)0) != 0)
- #else
- if (_dos_findfirst (nbuf, ATTRIBUTES, &dtabuf) != 0)
- #endif
- {
- free (nbuf);
- return dirp;
- }
-
- do
- {
- #ifdef OS2
- if (((dp = (DIRCONT *) malloc (sizeof (DIRCONT))) == (DIRCONT *)NULL) ||
- ((dp->_d_entry = strdup (dtabuf.achName)) == (char *) NULL))
- #else
- if (((dp = (DIRCONT *) malloc (sizeof (DIRCONT))) == (DIRCONT *)NULL) ||
- ((dp->_d_entry = strdup (dtabuf.name)) == (char *) NULL))
- #endif
- {
- if (dp != (char *)NULL)
- free ((char *)dp);
-
- free (nbuf);
- free_dircontents (dirp->dd_contents);
- #ifdef OS2
- DosFindClose (d_handle);
- #endif
- return (DIR *) NULL;
- }
-
- #ifdef OS2
- if (!HPFS)
- strlwr (dp->_d_entry);
- #endif
-
- 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;
-
- #ifdef OS2
- d_count = 1;
- } while (DosFindNext (d_handle, &dtabuf, sizeof (FILEFINDBUF),
- &d_count) == 0);
- #else
- } while (_dos_findnext (&dtabuf) == 0);
- #endif
-
- dirp->dd_cp = dirp->dd_contents;
- free (nbuf);
-
- #ifdef OS2
- DosFindClose (d_handle);
- #endif
-
- return dirp;
- }
-
- int closedir (dirp)
- DIR *dirp;
- {
- free_dircontents (dirp->dd_contents);
- free ((char *)dirp);
- return 0;
- }
-
- struct dirent *readdir (dirp)
- DIR *dirp;
- {
- static struct dirent dp;
-
- if (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;
- #ifndef OS2
- strlwr (dp.d_name);
- #endif
-
- return &dp;
- }
-
- void rewinddir (dirp)
- DIR *dirp;
- {
- seekdir (dirp, (off_t)0);
- }
-
- void seekdir (dirp, off)
- DIR *dirp;
- off_t off;
- {
- long i = off;
- DIRCONT *dp;
-
- if (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;
- }
-
- off_t telldir(dirp)
- DIR *dirp;
- {
- return dirp->dd_loc;
- }
-
- 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);
- }
- }
-
- /*
- * For OS/2, we need to know if we have to convert to lower case. This
- * only applies to non-HPFS (FAT, NETWARE etc) file systems.
- */
-
- #ifdef OS2
- bool IsHPFSFileSystem (char *directory)
- {
- USHORT nDrive;
- ULONG lMap;
- BYTE bData[64];
- BYTE bName[3];
- USHORT cbData;
-
- if ( _osmode == DOS_MODE )
- return FALSE;
-
- /*
- * Mike tells me there are IFS calls to determine this, but he carn't
- * remember which. So we read the partition info and check for HPFS.
- */
-
- if (isalpha (directory[0]) && (directory[1] == ':'))
- nDrive = toupper (directory[0]) - '@';
-
- else
- DosQCurDisk (&nDrive, &lMap);
-
- /* Set up the drive name */
-
- bName[0] = (char) (nDrive + '@');
- bName[1] = ':';
- bName[2] = 0;
-
- cbData = sizeof (bData);
-
- /* Read the info, if we fail - assume non-HPFS */
-
- if (DosQFSAttach (bName, 0, FSAIL_QUERYNAME, bData, &cbData, 0L) )
- return FALSE;
-
- else if (!strcmp (bData + (*((USHORT *) (bData + 2)) + 7), "HPFS"))
- return TRUE;
-
- else
- return FALSE;
- }
- #endif
-