hexchar,unhexchar,octchar,unoctchar,decchar,undecchar are
all const functions.
int get_process_uid(pid_t pid, uid_t *uid);
int get_process_gid(pid_t pid, gid_t *gid);
-char hexchar(int x);
-int unhexchar(char c);
-char octchar(int x);
-int unoctchar(char c);
-char decchar(int x);
-int undecchar(char c);
+char hexchar(int x) _const_;
+int unhexchar(char c) _const_;
+char octchar(int x) _const_;
+int unoctchar(char c) _const_;
+char decchar(int x) _const_;
+int undecchar(char c) _const_;
char *cescape(const char *s);
char *cunescape(const char *s);