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authorDarkvater <darkvater@openttd.org>2006-08-04 23:41:13 +0000
committerDarkvater <darkvater@openttd.org>2006-08-04 23:41:13 +0000
commit4de30befaee2141e410bf0df5d5f7e3906bc0111 (patch)
treeeafaa93a2d76a24ddd843e6f53f8e4c870a82afb
parentbca8e9ad4ea5cb0d9e20ff0432333ab5bc89b612 (diff)
downloadopenttd-4de30befaee2141e410bf0df5d5f7e3906bc0111.tar.xz
(svn r5762) - Codechange: Implementation of POSIX-style opendir/readdir/closedir functions for windows using FindFirstFile/FindNextFile/FindClose.
- Add new header file fios.h that will be the place for all FIOS (game-list) types.
-rw-r--r--fios.h38
-rw-r--r--win32.c105
2 files changed, 143 insertions, 0 deletions
diff --git a/fios.h b/fios.h
new file mode 100644
index 000000000..76c63b99c
--- /dev/null
+++ b/fios.h
@@ -0,0 +1,38 @@
+/* $Id$ */
+
+#ifndef FIOS_H
+#define FIOS_H
+
+/* Implementation of opendir/readdir/closedir for Windows */
+#if defined(WIN32)
+#include <windows.h>
+typedef struct DIR DIR;
+
+typedef struct dirent { // XXX - only d_name implemented
+ char *d_name; /* name of found file */
+ /* little hack which will point to parent DIR struct which will
+ * save us a call to GetFileAttributes if we want information
+ * about the file (for example in function fio_bla */
+ DIR *dir;
+} dirent;
+
+struct DIR {
+ HANDLE hFind;
+ /* the dirent returned by readdir.
+ * note: having only one global instance is not possible because
+ * multiple independent opendir/readdir sequences must be supported. */
+ dirent ent;
+ WIN32_FIND_DATA fd;
+ /* since opendir calls FindFirstFile, we need a means of telling the
+ * first call to readdir that we already have a file.
+ * that's the case iff this is true */
+ bool at_first_entry;
+};
+
+DIR *opendir(const char *path);
+struct dirent *readdir(DIR *d);
+int closedir(DIR *d);
+
+#endif /* defined(WIN32) */
+
+#endif /* FIOS_H */
diff --git a/win32.c b/win32.c
index a7cee0e92..a7dacb668 100644
--- a/win32.c
+++ b/win32.c
@@ -18,7 +18,11 @@
#include <fcntl.h>
#include "variables.h"
#include "win32.h"
+#include "fios.h" // opendir/readdir/closedir
#include <ctype.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
static bool _has_console;
@@ -602,6 +606,107 @@ static void Win32InitializeExceptions(void)
}
#endif /* _MSC_VER */
+/* Code below for windows version of opendir/readdir/closedir copied and
+ * modified from Jan Wassenberg's GPL implementation posted over at
+ * http://www.gamedev.net/community/forums/topic.asp?topic_id=364584&whichpage=1&#2398903 */
+
+/* suballocator - satisfies most requests with a reusable static instance.
+ * this avoids hundreds of alloc/free which would fragment the heap.
+ * To guarantee thread-safety, we fall back to malloc if the instance is
+ * already in use (it's important to avoid suprises since this is such a
+ * low-level routine). */
+static DIR _global_dir;
+static bool _global_dir_is_in_use = false;
+
+static inline DIR *dir_calloc(void)
+{
+ DIR *d;
+
+ if (_global_dir_is_in_use) {
+ d = calloc(1, sizeof(DIR));
+ } else {
+ _global_dir_is_in_use = true;
+ d = &_global_dir;
+ memset(d, 0, sizeof(DIR));
+ }
+ return d;
+}
+
+static inline void dir_free(DIR *d)
+{
+ if (d == &_global_dir) {
+ _global_dir_is_in_use = false;
+ } else {
+ free(d);
+ }
+}
+
+DIR *opendir(const char *path)
+{
+ char search_path[MAX_PATH];
+ DIR *d;
+ UINT sem = SetErrorMode(SEM_FAILCRITICALERRORS); // disable 'no-disk' message box
+ DWORD fa = GetFileAttributes(path);
+
+ /* not a directory or path not found */
+ if (fa == INVALID_FILE_ATTRIBUTES || (fa & FILE_ATTRIBUTE_DIRECTORY) == 0) {
+ errno = ENOENT;
+ return NULL;
+ }
+
+ d = dir_calloc();
+ if (d == NULL) {
+ errno = ENOMEM;
+ return NULL;
+ }
+
+ /* build search path for FindFirstFile */
+ snprintf(search_path, lengthof(search_path), "%s" PATHSEP "*", path);
+ d->hFind = FindFirstFile(search_path, &d->fd);
+ SetErrorMode(sem); // restore previous setting
+
+ if (d->hFind == INVALID_HANDLE_VALUE) {
+ /* not an error - the directory is just empty */
+ if (GetLastError() == ERROR_NO_MORE_FILES) return NULL;
+ dir_free(d);
+ }
+
+ d->ent.dir = d;
+ d->at_first_entry = true;
+ return d;
+}
+
+struct dirent *readdir(DIR *d)
+{
+ DWORD prev_err = GetLastError(); // avoid polluting last error
+
+ if (d->at_first_entry) {
+ /* the directory was empty when opened */
+ if (d->hFind == INVALID_HANDLE_VALUE) return NULL;
+ d->at_first_entry = false;
+ goto already_have_file;
+ }
+
+ /* Go until the end of directory or until a valid entry was found */
+ if (!FindNextFile(d->hFind, &d->fd)) { // determine cause and bail
+ if (GetLastError() == ERROR_NO_MORE_FILES) SetLastError(prev_err);
+ return NULL;
+ }
+
+already_have_file:
+ /* This entry has passed all checks; return information about it.
+ * (note: d_name is a pointer; see struct dirent definition) */
+ d->ent.d_name = d->fd.cFileName;
+ return &d->ent;
+}
+
+int closedir(DIR *d)
+{
+ FindClose(d->hFind);
+ dir_free(d);
+ return 0;
+}
+
static char *_fios_path;
static char *_fios_save_path;
static char *_fios_scn_path;