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lyx_mirror/development/Win32/patches/msvc/dirent.h
Joost Verburg b61b9cc6a4 LyX 1.5 Windows installer 
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15734 a592a061-630c-0410-9148-cb99ea01b6c8
2006-11-04 14:28:11 +00:00

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