cleanup wrappers for file operations

Previously wrapper functions for open(), opendir(), and stat(), etc,
are implemneted in path.h, and now they are in fileops.h and fileops.c.
This commit is a reparation for remote glob.

src/fileops.h

@@ -0,0 +1,47 @@
+
+#include <dirent.h>
+#include <sys/stat.h>
+
+#include <ssh.h>
+
+void set_tls_sftp_session(sftp_session sftp);
+/* sftp_session set by set_tls_sftp_session is sued in
+ mscp_open_wrapped(), mscp_stat_wrapped(), and
+ mscp_lstat_wrapped(). This _wrapped() functions exist for
+ sftp_glob() */
+
+struct mdir_struct {
+	DIR *local;
+	sftp_dir remote;
+};
+typedef struct mdir_struct MDIR;
+
+/* directory operations */
+MDIR *mscp_opendir(const char *path, sftp_session sftp);
+
+MDIR *mscp_opendir_wrapped(const char *path);
+int mscp_closedir(MDIR *md);
+struct dirent *mscp_readdir(MDIR *md);
+
+int mscp_mkdir(const char *path, mode_t mode, sftp_session sftp);
+
+/* stat operations */
+int mscp_stat(const char *path, struct stat *st, sftp_session sftp);
+int mscp_stat_wrapped(const char *path, struct stat *st);
+
+int mscp_lstat(const char *path, struct stat *st, sftp_session sftp);
+int mscp_lstat_wrapped(const char *path, struct stat *st);
+
+
+/* file operations */
+
+struct mf_struct {
+	sftp_file remote;
+	int local;
+};
+typedef struct mf_struct mf;
+
+mf *mscp_open(const char *path, int flags, mode_t mode, sftp_session sftp);
+void mscp_close(mf *f);
+int mscp_lseek(mf *f, size_t off);
+int mscp_chmod(const char *path, mode_t mode, sftp_session sftp);