321 lines
6.1 KiB
C
321 lines
6.1 KiB
C
/*
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* dirent.c
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*
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* Derived from DIRLIB.C by Matt J. Weinstein
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* This note appears in the DIRLIB.H
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* DIRLIB.H by M. J. Weinstein Released to public domain 1-Jan-89
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*
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* Updated by Jeremy Bettis <jeremy@hksys.com>
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* Significantly revised and rewinddir, seekdir and telldir added by Colin
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* Peters <colin@fu.is.saga-u.ac.jp>
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*
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* $Revision$
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* $Author$
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* $Date$
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*
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*/
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <io.h>
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#include <direct.h>
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#include <dirent.h>
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h> /* for GetFileAttributes */
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#define SUFFIX "*"
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#define SLASH "\\"
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/*
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* opendir
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*
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* Returns a pointer to a DIR structure appropriately filled in to begin
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* searching a directory.
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*/
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DIR *
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opendir (const char *szPath)
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{
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DIR *nd;
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unsigned int rc;
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char szFullPath[MAX_PATH];
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errno = 0;
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if (!szPath)
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{
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errno = EFAULT;
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return (DIR *) 0;
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}
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if (szPath[0] == '\0')
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{
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errno = ENOTDIR;
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return (DIR *) 0;
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}
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/* Attempt to determine if the given path really is a directory. */
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rc = GetFileAttributes (szPath);
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if (rc == -1)
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{
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/* call GetLastError for more error info */
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errno = ENOENT;
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return (DIR *) 0;
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}
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if (!(rc & FILE_ATTRIBUTE_DIRECTORY))
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{
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/* Error, entry exists but not a directory. */
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errno = ENOTDIR;
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return (DIR *) 0;
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}
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/* Make an absolute pathname. */
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_fullpath (szFullPath, szPath, MAX_PATH);
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/* Allocate enough space to store DIR structure and the complete
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* directory path given. */
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nd = (DIR *) malloc (sizeof (DIR) + strlen (szFullPath) + strlen (SLASH) +
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strlen (SUFFIX));
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if (!nd)
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{
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/* Error, out of memory. */
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errno = ENOMEM;
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return (DIR *) 0;
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}
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/* Create the search expression. */
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strcpy (nd->dd_name, szFullPath);
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/* Add on a slash if the path does not end with one. */
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if (nd->dd_name[0] != '\0' &&
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nd->dd_name[strlen (nd->dd_name) - 1] != '/' &&
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nd->dd_name[strlen (nd->dd_name) - 1] != '\\')
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{
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strcat (nd->dd_name, SLASH);
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}
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/* Add on the search pattern */
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strcat (nd->dd_name, SUFFIX);
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/* Initialize handle to -1 so that a premature closedir doesn't try
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* to call _findclose on it. */
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nd->dd_handle = -1;
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/* Initialize the status. */
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nd->dd_stat = 0;
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/* Initialize the dirent structure. ino and reclen are invalid under
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* Win32, and name simply points at the appropriate part of the
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* findfirst_t structure. */
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nd->dd_dir.d_ino = 0;
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nd->dd_dir.d_reclen = 0;
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nd->dd_dir.d_namlen = 0;
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nd->dd_dir.d_name = nd->dd_dta.name;
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return nd;
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}
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/*
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* readdir
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*
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* Return a pointer to a dirent structure filled with the information on the
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* next entry in the directory.
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*/
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struct dirent *
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readdir (DIR * dirp)
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{
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errno = 0;
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/* Check for valid DIR struct. */
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if (!dirp)
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{
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errno = EFAULT;
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return (struct dirent *) 0;
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}
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if (dirp->dd_dir.d_name != dirp->dd_dta.name)
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{
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/* The structure does not seem to be set up correctly. */
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errno = EINVAL;
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return (struct dirent *) 0;
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}
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if (dirp->dd_stat < 0)
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{
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/* We have already returned all files in the directory
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* (or the structure has an invalid dd_stat). */
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return (struct dirent *) 0;
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}
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else if (dirp->dd_stat == 0)
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{
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/* We haven't started the search yet. */
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/* Start the search */
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dirp->dd_handle = _findfirst (dirp->dd_name, &(dirp->dd_dta));
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if (dirp->dd_handle == -1)
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{
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/* Whoops! Seems there are no files in that
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* directory. */
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dirp->dd_stat = -1;
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}
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else
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{
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dirp->dd_stat = 1;
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}
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}
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else
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{
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/* Get the next search entry. */
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if (_findnext (dirp->dd_handle, &(dirp->dd_dta)))
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{
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/* We are off the end or otherwise error. */
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_findclose (dirp->dd_handle);
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dirp->dd_handle = -1;
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dirp->dd_stat = -1;
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}
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else
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{
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/* Update the status to indicate the correct
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* number. */
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dirp->dd_stat++;
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}
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}
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if (dirp->dd_stat > 0)
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{
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/* Successfully got an entry. Everything about the file is
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* already appropriately filled in except the length of the
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* file name. */
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dirp->dd_dir.d_namlen = strlen (dirp->dd_dir.d_name);
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return &dirp->dd_dir;
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}
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return (struct dirent *) 0;
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}
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/*
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* closedir
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*
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* Frees up resources allocated by opendir.
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*/
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int
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closedir (DIR * dirp)
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{
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int rc;
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errno = 0;
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rc = 0;
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if (!dirp)
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{
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errno = EFAULT;
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return -1;
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}
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if (dirp->dd_handle != -1)
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{
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rc = _findclose (dirp->dd_handle);
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}
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/* Delete the dir structure. */
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free (dirp);
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return rc;
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}
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/*
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* rewinddir
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*
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* Return to the beginning of the directory "stream". We simply call findclose
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* and then reset things like an opendir.
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*/
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void
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rewinddir (DIR * dirp)
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{
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errno = 0;
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if (!dirp)
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{
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errno = EFAULT;
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return;
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}
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if (dirp->dd_handle != -1)
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{
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_findclose (dirp->dd_handle);
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}
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dirp->dd_handle = -1;
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dirp->dd_stat = 0;
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}
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/*
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* telldir
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*
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* Returns the "position" in the "directory stream" which can be used with
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* seekdir to go back to an old entry. We simply return the value in stat.
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*/
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long
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telldir (DIR * dirp)
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{
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errno = 0;
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if (!dirp)
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{
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errno = EFAULT;
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return -1;
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}
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return dirp->dd_stat;
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}
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/*
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* seekdir
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*
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* Seek to an entry previously returned by telldir. We rewind the directory
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* and call readdir repeatedly until either dd_stat is the position number
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* or -1 (off the end). This is not perfect, in that the directory may
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* have changed while we weren't looking. But that is probably the case with
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* any such system.
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*/
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void
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seekdir (DIR * dirp, long lPos)
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{
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errno = 0;
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if (!dirp)
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{
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errno = EFAULT;
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return;
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}
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if (lPos < -1)
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{
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/* Seeking to an invalid position. */
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errno = EINVAL;
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return;
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}
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else if (lPos == -1)
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{
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/* Seek past end. */
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if (dirp->dd_handle != -1)
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{
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_findclose (dirp->dd_handle);
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}
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dirp->dd_handle = -1;
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dirp->dd_stat = -1;
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}
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else
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{
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/* Rewind and read forward to the appropriate index. */
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rewinddir (dirp);
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while ((dirp->dd_stat < lPos) && readdir (dirp))
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;
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}
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}
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