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601 lines
18 KiB
C
601 lines
18 KiB
C
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/*
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* dirent.h - operating system independent dirent implementation
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*
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* Copyright (C) 1998-2002 Toni Ronkko
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* ``Software''), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL TONI RONKKO BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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*
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* Aug 20, 2006, Toni Ronkko
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* Removed all remarks about MSVC 1.0, which is antiqued now. Simplified
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* comments by removing SGML tags.
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*
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* May 14 2002, Toni Ronkko
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* Embedded the function definitions directly to the header so that no source
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* modules must be included in the MS Visual C project for using the
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* interface. Removed all the dependencies to other projects so
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* that this very header can be used independently.
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*
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* May 28 1998, Toni Ronkko
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* First version.
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*/
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#ifndef DIRENT_H
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#define DIRENT_H
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#define DIRENT_H_INCLUDED
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/* find out platform */
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#if defined(MSDOS) /* MS-DOS */
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#elif defined(__MSDOS__) /* Turbo C/Borland */
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# define MSDOS
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#elif defined(__DOS__) /* Watcom */
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# define MSDOS
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#endif
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#if defined(WIN32) /* MS-Windows */
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#elif defined(__NT__) /* Watcom */
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# define WIN32
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#elif defined(_WIN32) /* Microsoft */
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# define WIN32
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#elif defined(__WIN32__) /* Borland */
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# define WIN32
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#endif
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/*
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* See what kind of dirent interface we have unless autoconf has already
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* determinated that.
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*/
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#if !defined(HAVE_DIRENT_H) && !defined(HAVE_DIRECT_H) && !defined(HAVE_SYS_DIR_H) && !defined(HAVE_NDIR_H) && !defined(HAVE_SYS_NDIR_H) && !defined(HAVE_DIR_H)
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# if defined(_MSC_VER) /* Microsoft C/C++ */
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/* no dirent.h */
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# elif defined(__BORLANDC__) /* Borland C/C++ */
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# define HAVE_DIRENT_H
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# define VOID_CLOSEDIR
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# elif defined(__TURBOC__) /* Borland Turbo C */
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/* no dirent.h */
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# elif defined(__WATCOMC__) /* Watcom C/C++ */
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# define HAVE_DIRECT_H
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# elif defined(__apollo) /* Apollo */
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# define HAVE_SYS_DIR_H
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# elif defined(__hpux) /* HP-UX */
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# define HAVE_DIRENT_H
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# elif defined(__alpha) || defined(__alpha__) /* Alpha OSF1 */
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# error "not implemented"
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# elif defined(__sgi) /* Silicon Graphics */
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# define HAVE_DIRENT_H
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# elif defined(sun) || defined(_sun) /* Sun Solaris */
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# define HAVE_DIRENT_H
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# elif defined(__FreeBSD__) /* FreeBSD */
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# define HAVE_DIRENT_H
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# elif defined(__linux__) /* Linux */
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# define HAVE_DIRENT_H
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# elif defined(__GNUC__) /* GNU C/C++ */
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# define HAVE_DIRENT_H
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# else
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# error "not implemented"
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# endif
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#endif
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/* include proper interface headers */
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#if defined(HAVE_DIRENT_H)
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# include <dirent.h>
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# ifdef FREEBSD
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# define NAMLEN(dp) ((int)((dp)->d_namlen))
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# else
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# define NAMLEN(dp) ((int)(strlen((dp)->d_name)))
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# endif
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#elif defined(HAVE_NDIR_H)
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# include <ndir.h>
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# define NAMLEN(dp) ((int)((dp)->d_namlen))
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#elif defined(HAVE_SYS_NDIR_H)
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# include <sys/ndir.h>
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# define NAMLEN(dp) ((int)((dp)->d_namlen))
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#elif defined(HAVE_DIRECT_H)
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# include <direct.h>
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# define NAMLEN(dp) ((int)((dp)->d_namlen))
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#elif defined(HAVE_DIR_H)
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# include <dir.h>
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# define NAMLEN(dp) ((int)((dp)->d_namlen))
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#elif defined(HAVE_SYS_DIR_H)
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# include <sys/types.h>
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# include <sys/dir.h>
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# ifndef dirent
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# define dirent direct
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# endif
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# define NAMLEN(dp) ((int)((dp)->d_namlen))
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#elif defined(MSDOS) || defined(WIN32)
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/* figure out type of underlaying directory interface to be used */
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# if defined(WIN32)
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# define DIRENT_WIN32_INTERFACE
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# elif defined(MSDOS)
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# define DIRENT_MSDOS_INTERFACE
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# else
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# error "missing native dirent interface"
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# endif
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/*** WIN32 specifics ***/
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# if defined(DIRENT_WIN32_INTERFACE)
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# include <windows.h>
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# if !defined(DIRENT_MAXNAMLEN)
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# define DIRENT_MAXNAMLEN (MAX_PATH)
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# endif
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/*** MS-DOS specifics ***/
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# elif defined(DIRENT_MSDOS_INTERFACE)
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# include <dos.h>
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/* Borland defines file length macros in dir.h */
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# if defined(__BORLANDC__)
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# include <dir.h>
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# if !defined(DIRENT_MAXNAMLEN)
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# define DIRENT_MAXNAMLEN ((MAXFILE)+(MAXEXT))
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# endif
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# if !defined(_find_t)
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# define _find_t find_t
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# endif
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/* Turbo C defines ffblk structure in dir.h */
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# elif defined(__TURBOC__)
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# include <dir.h>
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# if !defined(DIRENT_MAXNAMLEN)
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# define DIRENT_MAXNAMLEN ((MAXFILE)+(MAXEXT))
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# endif
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# define DIRENT_USE_FFBLK
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/* MSVC */
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# elif defined(_MSC_VER)
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# if !defined(DIRENT_MAXNAMLEN)
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# define DIRENT_MAXNAMLEN (12)
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# endif
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/* Watcom */
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# elif defined(__WATCOMC__)
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# if !defined(DIRENT_MAXNAMLEN)
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# if defined(__OS2__) || defined(__NT__)
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# define DIRENT_MAXNAMLEN (255)
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# else
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# define DIRENT_MAXNAMLEN (12)
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# endif
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# endif
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# endif
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# endif
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/*** generic MS-DOS and MS-Windows stuff ***/
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# if !defined(NAME_MAX) && defined(DIRENT_MAXNAMLEN)
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# define NAME_MAX DIRENT_MAXNAMLEN
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# endif
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# if NAME_MAX < DIRENT_MAXNAMLEN
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# error "assertion failed: NAME_MAX >= DIRENT_MAXNAMLEN"
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# endif
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/*
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* Substitute for real dirent structure. Note that d_name field is a
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* true character array although we have it copied in the implementation
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* dependent data. We could save some memory if we had declared d_name
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* as a pointer refering the name within implementation dependent data.
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* We have not done that since some code may rely on sizeof(d_name) to be
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* something other than four. Besides, directory entries are typically so
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* small that it takes virtually no time to copy them from place to place.
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*/
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typedef struct dirent {
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char d_name[NAME_MAX + 1];
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/*** Operating system specific part ***/
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# if defined(DIRENT_WIN32_INTERFACE) /*WIN32*/
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WIN32_FIND_DATA data;
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# elif defined(DIRENT_MSDOS_INTERFACE) /*MSDOS*/
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# if defined(DIRENT_USE_FFBLK)
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struct ffblk data;
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# else
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struct _find_t data;
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# endif
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# endif
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} dirent;
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/*
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* DIR substitute structure containing directory name. The name is
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* essential for the operation of rewinndir() function.
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*/
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typedef struct DIR {
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char *dirname; /* directory being scanned */
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dirent current; /* current entry */
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int dirent_filled; /* is current un-processed? */
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/*** Operating system specific part ***/
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# if defined(DIRENT_WIN32_INTERFACE)
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HANDLE search_handle;
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# elif defined(DIRENT_MSDOS_INTERFACE)
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# endif
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} DIR;
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# ifdef __cplusplus
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extern "C" {
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# endif
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/* prototypes of public dirent functions */
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static DIR *opendir (const char *dirname);
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static struct dirent *readdir (DIR *dirp);
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static int closedir (DIR *dirp);
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static void rewinddir (DIR *dirp);
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/*
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* Implement dirent interface as static functions so that the user does not
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* need to change his project in any way to use dirent function. With this
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* it is sufficient to include this very header from source modules using
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* dirent functions and the functions will be pulled in automatically.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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/* use ffblk instead of _find_t if requested */
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#if defined(DIRENT_USE_FFBLK)
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# define _A_ARCH (FA_ARCH)
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# define _A_HIDDEN (FA_HIDDEN)
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# define _A_NORMAL (0)
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# define _A_RDONLY (FA_RDONLY)
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# define _A_SUBDIR (FA_DIREC)
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# define _A_SYSTEM (FA_SYSTEM)
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# define _A_VOLID (FA_LABEL)
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# define _dos_findnext(dest) findnext(dest)
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# define _dos_findfirst(name,flags,dest) findfirst(name,dest,flags)
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#endif
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/* internal prototypes */
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static int _initdir (DIR *p);
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static const char *_getdirname (const struct dirent *dp);
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static void _setdirname (struct DIR *dirp);
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/*
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* Open directory stream DIRNAME for read and return pointer to the
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* internal working area that is used for retrieving individual directory
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* entries. The internal working area has no fields of your interest.
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*/
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static DIR *
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opendir(
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const char *dirname)
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{
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DIR *dirp;
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assert (dirname != NULL);
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dirp = (DIR*)malloc (sizeof (struct DIR));
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if (dirp != NULL) {
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char *p;
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/* allocate room for directory name */
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dirp->dirname = (char*) malloc (strlen (dirname) + 1 + strlen ("\\*.*"));
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if (dirp->dirname == NULL) {
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/* failed to duplicate directory name. errno set by malloc() */
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free (dirp);
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return NULL;
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}
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/*
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* Copy directory name while appending directory separator and "*.*".
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* Directory separator is not appended if the name already ends with
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* drive or directory separator. Directory separator is assumed to be
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* '/' or '\' and drive separator is assumed to be ':'.
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*/
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strcpy (dirp->dirname, dirname);
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p = strchr (dirp->dirname, '\0');
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if (dirp->dirname < p &&
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*(p - 1) != '\\' && *(p - 1) != '/' && *(p - 1) != ':')
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{
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strcpy (p++, "\\");
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}
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# ifdef DIRENT_WIN32_INTERFACE
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strcpy (p, "*"); /*scan files with and without extension in win32*/
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# else
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strcpy (p, "*.*"); /*scan files with and without extension in DOS*/
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# endif
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/* open stream */
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if (_initdir (dirp) == 0) {
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/* initialization failed */
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free (dirp->dirname);
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free (dirp);
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return NULL;
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}
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}
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return dirp;
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}
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/*
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* Read a directory entry and return pointer to a structure containing the
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* name of the entry. Individual directory entries returned by this very
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* function include normal files, sub-directories, pseudo-directories "."
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* and ".." and also volume labels, hidden files and system files in MS-DOS
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* and MS-Windows. You might want to use stat(2) function to determinate
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* which one you are dealing with.
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*
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* The dirent structure contains several system dependent fields that
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* generally have no interest to you. The only interesting one is char
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* d_name[] that is also portable across different systems. The d_name
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* field contains the name of the directory entry without leading path.
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* While d_name is portable across different systems, the actual storage
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* capacity of d_name varies from system to system and there is no portable
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* way to find out it at compile time. Different systems define the
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* capacity of d_name with different macros and some systems do not define
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* capacity at all (besides actual declaration of the field). If you really
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* need to find out storage capacity of d_name then you might want to try
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* NAME_MAX macro. The NAME_MAX is defined in POSIX standard althought
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* there are many MS-DOS and MS-Windows implementations those do not define
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* it. There are also systems that declare d_name as "char d_name[1]" and
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* then allocate suitable amount of memory at run-time. Thanks to Alain
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* Decamps (Alain dot Decamps atsign advalvas dot be) for pointing it out to
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* me.
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*
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* This all leads to the fact that it is difficult to allocate space
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* for the directory names when the very same program is being compiled on
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* number of operating systems. Therefore I suggest that you always
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* allocate space for directory names dynamically.
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*/
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static struct dirent *
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readdir (DIR *dirp)
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{
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assert (dirp != NULL);
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if (dirp == NULL) {
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errno = EBADF;
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return NULL;
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}
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#if defined(DIRENT_WIN32_INTERFACE)
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if (dirp->search_handle == INVALID_HANDLE_VALUE) {
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/* directory stream was opened/rewound incorrectly or it ended normally */
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errno = EBADF;
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return NULL;
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}
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#endif
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if (dirp->dirent_filled != 0) {
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/*
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* Directory entry has already been retrieved and there is no need to
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* retrieve a new one. Directory entry will be retrieved in advance
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* when the user calls readdir function for the first time. This is so
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* because real dirent has separate functions for opening and reading
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* the stream whereas Win32 and DOS dirents open the stream
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* automatically when we retrieve the first file. Therefore, we have to
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* save the first file when opening the stream and later we have to
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* return the saved entry when the user tries to read the first entry.
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*/
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dirp->dirent_filled = 0;
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} else {
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/* fill in entry and return that */
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#if defined(DIRENT_WIN32_INTERFACE)
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if (FindNextFile (dirp->search_handle, &dirp->current.data) == FALSE) {
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/* Last file has been processed or an error occured */
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FindClose (dirp->search_handle);
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dirp->search_handle = INVALID_HANDLE_VALUE;
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errno = ENOENT;
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return NULL;
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}
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# elif defined(DIRENT_MSDOS_INTERFACE)
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if (_dos_findnext (&dirp->current.data) != 0) {
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/* _dos_findnext and findnext will set errno to ENOENT when no
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* more entries could be retrieved. */
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return NULL;
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}
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# endif
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_setdirname (dirp);
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assert (dirp->dirent_filled == 0);
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}
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return &dirp->current;
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}
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/*
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* Close directory stream opened by opendir() function. Close of the
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* directory stream invalidates the DIR structure as well as any previously
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||
|
* read directory entry.
|
||
|
*
|
||
|
* Usually, the function returns 0 on success and -1 on failure. However,
|
||
|
* on some systems, the function has been declared to return void. If you
|
||
|
* want to keep your code portable, it may be better to ignore the return
|
||
|
* value altogether.
|
||
|
*/
|
||
|
static int
|
||
|
closedir (DIR *dirp)
|
||
|
{
|
||
|
int retcode = 0;
|
||
|
|
||
|
/* make sure that dirp points to legal structure */
|
||
|
assert (dirp != NULL);
|
||
|
if (dirp == NULL) {
|
||
|
errno = EBADF;
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
/* free directory name */
|
||
|
if (dirp->dirname != NULL) {
|
||
|
free (dirp->dirname);
|
||
|
}
|
||
|
|
||
|
/* release search handle */
|
||
|
#if defined(DIRENT_WIN32_INTERFACE)
|
||
|
if (dirp->search_handle != INVALID_HANDLE_VALUE) {
|
||
|
if (FindClose (dirp->search_handle) == FALSE) {
|
||
|
/* Unknown error */
|
||
|
retcode = -1;
|
||
|
errno = EBADF;
|
||
|
}
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
/* clear dirp structure to make sure that it cannot be used anymore*/
|
||
|
memset (dirp, 0, sizeof (*dirp));
|
||
|
# if defined(DIRENT_WIN32_INTERFACE)
|
||
|
dirp->search_handle = INVALID_HANDLE_VALUE;
|
||
|
# endif
|
||
|
|
||
|
free (dirp);
|
||
|
return retcode;
|
||
|
}
|
||
|
|
||
|
|
||
|
|
||
|
/*
|
||
|
* Rewind the directory stream to re-read the directory entries. If new
|
||
|
* files or directories have been created since opendir(), then also these
|
||
|
* new files will be available with readdir().
|
||
|
*
|
||
|
* Almost every dirent implementation ensures that rewinddir() updates its
|
||
|
* internal caches to reflect the current directory structure on disk.
|
||
|
* However, if you really depend on this feature, it may be better to close
|
||
|
* and re-open the directory stream. I recall one particual dirent
|
||
|
* interface, where rewinddir() did not update its internal cache.
|
||
|
*
|
||
|
* BUGS: If the current working directory is changed between opendir() and
|
||
|
* rewinddir(), then the rewound directory stream may refer a non-existent
|
||
|
* directory, or at worst case, to another directory.
|
||
|
*/
|
||
|
static void
|
||
|
rewinddir (DIR *dirp)
|
||
|
{
|
||
|
/* make sure that dirp is legal */
|
||
|
assert (dirp != NULL);
|
||
|
if (dirp == NULL) {
|
||
|
errno = EBADF;
|
||
|
return;
|
||
|
}
|
||
|
assert (dirp->dirname != NULL);
|
||
|
|
||
|
/* close previous stream */
|
||
|
#if defined(DIRENT_WIN32_INTERFACE)
|
||
|
if (dirp->search_handle != INVALID_HANDLE_VALUE) {
|
||
|
if (FindClose (dirp->search_handle) == FALSE) {
|
||
|
/* Unknown error */
|
||
|
errno = EBADF;
|
||
|
}
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
/* re-open previous stream */
|
||
|
if (_initdir (dirp) == 0) {
|
||
|
/* initialization failed but we cannot deal with error. User will notice
|
||
|
* error later when she tries to retrieve first directory enty. */
|
||
|
/*EMPTY*/;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
|
||
|
|
||
|
/*
|
||
|
* Open native directory stream object and retrieve first file.
|
||
|
* Be sure to close previous stream before opening new one.
|
||
|
*/
|
||
|
static int
|
||
|
_initdir (DIR *dirp)
|
||
|
{
|
||
|
assert (dirp != NULL);
|
||
|
assert (dirp->dirname != NULL);
|
||
|
dirp->dirent_filled = 0;
|
||
|
|
||
|
# if defined(DIRENT_WIN32_INTERFACE)
|
||
|
/* Open stream and retrieve first file */
|
||
|
dirp->search_handle = FindFirstFile (dirp->dirname, &dirp->current.data);
|
||
|
if (dirp->search_handle == INVALID_HANDLE_VALUE) {
|
||
|
/* something went wrong but we don't know what. GetLastError() could
|
||
|
* give us more information about the error, but then we should map
|
||
|
* the error code into errno. */
|
||
|
errno = ENOENT;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
# elif defined(DIRENT_MSDOS_INTERFACE)
|
||
|
if (_dos_findfirst (dirp->dirname,
|
||
|
_A_SUBDIR | _A_RDONLY | _A_ARCH | _A_SYSTEM | _A_HIDDEN,
|
||
|
&dirp->current.data) != 0)
|
||
|
{
|
||
|
/* _dos_findfirst and findfirst will set errno to ENOENT when no
|
||
|
* more entries could be retrieved. */
|
||
|
return 0;
|
||
|
}
|
||
|
# endif
|
||
|
|
||
|
/* initialize DIR and it's first entry */
|
||
|
_setdirname (dirp);
|
||
|
dirp->dirent_filled = 1;
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
|
||
|
|
||
|
/*
|
||
|
* Return implementation dependent name of the current directory entry.
|
||
|
*/
|
||
|
static const char *
|
||
|
_getdirname (const struct dirent *dp)
|
||
|
{
|
||
|
#if defined(DIRENT_WIN32_INTERFACE)
|
||
|
return dp->data.cFileName;
|
||
|
|
||
|
#elif defined(DIRENT_USE_FFBLK)
|
||
|
return dp->data.ff_name;
|
||
|
|
||
|
#else
|
||
|
return dp->data.name;
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
|
||
|
|
||
|
/*
|
||
|
* Copy name of implementation dependent directory entry to the d_name field.
|
||
|
*/
|
||
|
static void
|
||
|
_setdirname (struct DIR *dirp) {
|
||
|
/* make sure that d_name is long enough */
|
||
|
assert (strlen (_getdirname (&dirp->current)) <= NAME_MAX);
|
||
|
|
||
|
strncpy (dirp->current.d_name,
|
||
|
_getdirname (&dirp->current),
|
||
|
NAME_MAX);
|
||
|
dirp->current.d_name[NAME_MAX] = '\0'; /*char d_name[NAME_MAX+1]*/
|
||
|
}
|
||
|
|
||
|
# ifdef __cplusplus
|
||
|
}
|
||
|
# endif
|
||
|
# define NAMLEN(dp) ((int)(strlen((dp)->d_name)))
|
||
|
|
||
|
#else
|
||
|
# error "missing dirent interface"
|
||
|
#endif
|
||
|
|
||
|
|
||
|
#endif /*DIRENT_H*/
|