prom_strrchr
s = prom_strrchr(path, '/');
p = prom_strrchr(s, ':');
p = prom_strrchr(pathname, '/');
if ((p = prom_strrchr(to, '/')) == 0)
if ((p = prom_strrchr(from, '/')) == 0)
extern char *prom_strrchr(char *s1, char c);
extern char *prom_strrchr(char *s1, char c);