[Components/dlib] Add dirent.h to dlib libc.

components/libc/compilers/dlib/dirent.h

+#ifndef __RTT_DIRENT_H__
+#define __RTT_DIRENT_H__
+
+#include <rtthread.h>
+#include <rtlibc.h>
+
+/*
+* dirent.h - format of directory entries
+ * Ref: http://www.opengroup.org/onlinepubs/009695399/basedefs/dirent.h.html
+ */
+
+/* File types */
+#define FT_REGULAR      0   /* regular file */
+#define FT_SOCKET       1   /* socket file  */
+#define FT_DIRECTORY    2   /* directory    */
+#define FT_USER         3   /* user defined */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef HAVE_DIR_STRUCTURE
+typedef struct
+{
+    int fd;                         /* directory file */
+    char buf[512];
+    int num;
+    int cur;
+} DIR;
+#endif
+
+#ifndef HAVE_DIRENT_STRUCTURE
+struct dirent
+{
+    rt_uint8_t  d_type;             /* The type of the file */
+    rt_uint8_t  d_namlen;           /* The length of the not including the terminating null file name */
+    rt_uint16_t d_reclen;           /* length of this record */
+    char d_name[256];               /* The null-terminated file name */
+};
+#endif
+
+int            closedir(DIR *);
+DIR           *opendir(const char *);
+struct dirent *readdir(DIR *);
+int            readdir_r(DIR *, struct dirent *, struct dirent **);
+void           rewinddir(DIR *);
+void           seekdir(DIR *, long int);
+long           telldir(DIR *);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif