isvalidname
#define isvalidname(c) ((c) >= 'a' && (c) <= 'z')
#define isvalidname(c) ((c) >= 'a' && (c) <= 'z')
#define isvalidname(c) ((c) >= 'a' && (c) <= 'z')
#define isvalidname(c) ((c) >= 'a' && (c) <= 'z')
#define isvalidname(c) ((c) >= 'a' && (c) <= 'z')