337 lines
7.7 KiB
C
337 lines
7.7 KiB
C
//
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// 03/10/2006 James Haley
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//
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// For this module only:
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// This code is public domain. No change sufficient enough to constitute a
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// significant or original work has been made, and thus it remains as such.
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//
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//
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// DESCRIPTION:
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//
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// Implementation of POSIX opendir for Visual C++.
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// Derived from the MinGW C Library Extensions Source (released to the
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// public domain). As with other Win32 modules, don't include most DOOM
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// headers into this or conflicts will occur.
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//
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// Original Header:
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//
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// * dirent.c
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// * This file has no copyright assigned and is placed in the Public Domain.
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// * This file is a part of the mingw-runtime package.
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// * No warranty is given; refer to the file DISCLAIMER within the package.
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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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#ifndef _MSC_VER
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#error i_opndir.c is for Microsoft Visual C++ only
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#endif
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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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#define WIN32_LEAN_AND_MEAN
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#include <windows.h> /* for GetFileAttributes */
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#include <tchar.h>
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#define SUFFIX _T("*")
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#define SLASH _T("\\")
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#include "win_opendir.h"
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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 *opendir(const _TCHAR *szPath)
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{
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DIR *nd;
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unsigned int rc;
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_TCHAR 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] == _T('\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 == (unsigned int)-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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_tfullpath(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) + (_tcslen(szFullPath)
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+ _tcslen(SLASH)
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+ _tcslen(SUFFIX) + 1)
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* sizeof(_TCHAR)));
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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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_tcscpy(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] != _T('\0')
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&& _tcsrchr(nd->dd_name, _T('/')) != nd->dd_name
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+ _tcslen(nd->dd_name) - 1
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&& _tcsrchr(nd->dd_name, _T('\\')) != nd->dd_name
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+ _tcslen(nd->dd_name) - 1)
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{
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_tcscat(nd->dd_name, SLASH);
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}
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/* Add on the search pattern */
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_tcscat(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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memset(nd->dd_dir.d_name, 0, FILENAME_MAX);
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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 *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_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 = _tfindfirst(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(_tfindnext(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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_findnext sets errno to ENOENT if no more file
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Undo this. */
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DWORD winerr = GetLastError();
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if(winerr == ERROR_NO_MORE_FILES)
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errno = 0;
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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 = _tcslen(dirp->dd_dta.name);
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_tcscpy(dirp->dd_dir.d_name, dirp->dd_dta.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 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 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 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 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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; /* do-nothing loop */
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}
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}
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// EOF
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