+#define HYPHENP(x) (*(x) == '-' && !*((x) + 1))
+
+char *time_str (time_t);
+char *datetime_str (time_t);
+
+char *xstrdup_lower (const char *);
+
+char *strdupdelim (const char *, const char *);
+char **sepstring (const char *);
+bool subdir_p (const char *, const char *);
+void fork_to_background (void);
+
+char *aprintf (const char *, ...) GCC_FORMAT_ATTR (1, 2);
+char *concat_strings (const char *, ...);
+
+void touch (const char *, time_t);
+int remove_link (const char *);
+bool file_exists_p (const char *);
+bool file_non_directory_p (const char *);
+wgint file_size (const char *);
+int make_directory (const char *);
+char *unique_name (const char *, bool);
+FILE *unique_create (const char *, bool, char **);
+FILE *fopen_excl (const char *, bool);
+char *file_merge (const char *, const char *);
+
+int fnmatch_nocase (const char *, const char *, int);
+bool acceptable (const char *);
+bool accdir (const char *s);
+char *suffix (const char *s);
+bool match_tail (const char *, const char *, bool);
+bool has_wildcards_p (const char *);
+
+bool has_html_suffix_p (const char *);
+
+char *read_whole_line (FILE *);
+struct file_memory *read_file (const char *);
+void read_file_free (struct file_memory *);
+
+void free_vec (char **);
+char **merge_vecs (char **, char **);
+char **vec_append (char **, const char *);
+
+void string_set_add (struct hash_table *, const char *);
+int string_set_contains (struct hash_table *, const char *);
+void string_set_to_array (struct hash_table *, char **);
+void string_set_free (struct hash_table *);
+void free_keys_and_values (struct hash_table *);
+
+const char *with_thousand_seps (wgint);
+
+/* human_readable must be able to accept wgint and SUM_SIZE_INT
+ arguments. On machines where wgint is 32-bit, declare it to accept
+ double. */
+#if SIZEOF_WGINT >= 8
+# define HR_NUMTYPE wgint
+#else
+# define HR_NUMTYPE double
+#endif
+char *human_readable (HR_NUMTYPE);
+