fix various missing prototype warnings

--- a/e2tools.h
+++ b/e2tools.h
@@ -63,38 +63,33 @@
 #define E2T_FORCE 1
 #define E2T_DO_MV 2
 
-#ifndef COPY_C
+/* copy.c */
 extern long copy(int argc, char *argv[]);
 extern int my_strcmp(const void *n1, const void *n2);
-#endif
 
-#ifdef LN_C
+/* ln.c */
 extern long do_ln(int argc, char *argv[]);
 
 extern long create_hard_link(ext2_filsys fs, ext2_ino_t cwd, ext2_ino_t
                              new_file_ino, char *newfile, int ln_flags);
-#endif
 
-#ifndef LS_C
+/* ls.c */
 extern long do_list_dir(int argc, char *argv[]);
-#endif
 
-#ifndef MKDIR_C
+/* mkdir.c */
 extern long e2mkdir(int argc, char *argv[]);
 extern long create_dir(ext2_filsys fs, ext2_ino_t root, ext2_ino_t *cwd,
                        char *dirname, struct stat *def_stat);
-#endif
+extern long change_cwd(ext2_filsys fs, ext2_ino_t root, ext2_ino_t *cwd,
+                       char *dirname);
 
-#ifdef MV_C
+/* mv.c */
 extern long do_mv(int argc, char *argv[]);
 extern long get_file_parts(ext2_filsys fs, ext2_ino_t root, char *pathname,
                            ext2_ino_t *dir_ino, char **dir_name,
                            char **base_name);
 
-#endif
-
-
-#ifndef READ_C
+/* read.c */
 extern long get_file(ext2_filsys fs, ext2_ino_t root, ext2_ino_t cwd,
                      char *infile, char *outfile, int keep);
 extern long retrieve_data(ext2_filsys fs, ext2_ino_t src, int dest_fd,
@@ -102,17 +97,14 @@ extern long retrieve_data(ext2_filsys fs, ext2_ino_t src, int dest_fd,
                           ext2_off_t *ret_pos);
 extern long read_to_eof(ext2_file_t infile, int dest_fd, ext2_off_t offset,
                         ext2_off_t *ret_pos);
-#endif
 
-#ifndef RM_C
+/* rm.c */
 extern long e2rm(int argc, char *argv[]);
-#endif
 
-#ifndef TAIL_C
+/* tail.c */
 extern long do_tail(int argc, char *argv[]);
-#endif
 
-#ifndef UTIL_C
+/* util.c */
 extern mode_t ext2_mode_xlate(__u16 lmode);
 extern __u16 host_mode_xlate(mode_t hmode);
 extern long open_filesystem(char *name, ext2_filsys *fs, ext2_ino_t *root, int
@@ -125,13 +117,14 @@ extern long rm_file(ext2_filsys fs, ext2_ino_t cwd, char *outfile, ext2_ino_t
                     delfile); 
 extern long delete_file(ext2_filsys fs, ext2_ino_t inode);
 extern void init_stat_buf(struct stat *buf);
-#endif
+#include <regex.h>
+extern regex_t *make_regexp(char *shell);
+extern int is_file_regexp(char *ptr);
 
-#ifndef WRITE_C
+/* write.c */
 extern long
 put_file(ext2_filsys fs, ext2_ino_t cwd, char *infile, char *outfile,
          ext2_ino_t *outfile_ino, int keep, struct stat *def_stat);
-#endif
 
 #endif
 
--- a/elist.c
+++ b/elist.c
@@ -41,12 +41,9 @@
 /* Feature Test Switches */
 /* Headers */
 #include <memory.h>
+#include <stdlib.h>
 #include "elist.h"
 
-#ifndef NULL
-#define NULL ((void *)0)
-#endif
-
 elist_t *
 elist_new()
 {
--- a/ls.c
+++ b/ls.c
@@ -703,7 +703,7 @@ void short_disp(ls_file_t *info, int *col, int options)
   char lbr, rbr;
   char tmp[300];
   int thislen;
-  static max_col_size = 0;
+  static int max_col_size = 0;
 
   if (max_col_size == 0)
     {
--- a/mkdir.c
+++ b/mkdir.c
@@ -357,7 +357,7 @@ create_dir(ext2_filsys fs, ext2_ino_t root, ext2_ino_t *cwd,
                                               def_stat)))
                     {
                       fprintf(stderr,
-                              "create_dir: error creating directory %s/%s:%d\n",
+                              "create_dir: error creating directory %s/%s:%ld\n",
                               dirname, dname, retval);
                       ext2fs_free_mem((void **) &buf);
                       return(retval);
@@ -415,7 +415,7 @@ create_dir(ext2_filsys fs, ext2_ino_t root, ext2_ino_t *cwd,
       if ((retval = create_subdir(fs, root, cwd, dirname, def_stat)))
         {
           fprintf(stderr,
-                  "create_dir: error creating directory %s:%d\n",
+                  "create_dir: error creating directory %s:%ld\n",
                   dirname, retval);
           return(retval);
         }
--- a/progress.c
+++ b/progress.c
@@ -26,6 +26,8 @@
 /* Feature Test Switches */
 /* System Headers */
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <sys/stat.h>
 #include <sys/time.h>
@@ -154,7 +156,7 @@ void update_progress(unsigned long num_bytes)
   if (prog_sbuf != NULL && prog_time != tv.tv_sec)
     {
       prog_time = tv.tv_sec;
-      fprintf(stderr, "%s %10d / %10d\r", prog_file, num_bytes,
+      fprintf(stderr, "%s %10lu / %10jd\r", prog_file, num_bytes,
               prog_sbuf->st_size);
       fflush(stderr);
     }
--- a/rm.c
+++ b/rm.c
@@ -244,7 +244,6 @@ e2rm(int argc, char *argv[])
                   retval = ext2fs_dir_iterate2(gbl_fs, curr_ino,
                                                DIRENT_FLAG_INCLUDE_EMPTY, 0,
                                                rm_dir_proc,
-                                               (void *)
                                                (verbose) ? &verbose : NULL);
                 }
               else