+char **tokenize(char *src);
+void freeca(char **ca);
+int calen(char **a);
+void bvprintf(struct charbuf *buf, char *format, va_list al);
+void bprintf(struct charbuf *buf, char *format, ...);
+void replstr(char **p, char *n);
+char *base64encode(char *data, size_t datalen);
+char *base64decode(char *data, size_t *datalen);