242 #define coerce_to_upper(c) ((islower(c) ? toupper(c) : (c)))  argument
243 #define coerce_to_lower(c) ((isupper(c) ? tolower(c) : (c)))  argument
247 #define CTL(c) ((c) & (~control_character_bit))  argument
248 #define UNCTL(c) coerce_to_upper(((c)|control_character_bit))  argument
249 #define META(c) ((c) | (meta_character_bit))  argument
250 #define UNMETA(c) ((c) & (~meta_character_bit))  argument
252 #define whitespace(c)       ((c) == '\t' || (c) == ' ')  argument
253 #define sentence_ender(c)   ((c) == '.'  || (c) == '?' || (c) == '!')  argument
254 #define cr_or_whitespace(c) (whitespace(c) || (c) == '\r' || (c) == '\n')  argument
257 #define isletter(c) (((c) >= 'A' && (c) <= 'Z') || ((c) >= 'a' && (c) <= 'z'))  argument
261 #define isupper(c) ((c) >= 'A' && (c) <= 'Z')  argument
265 #define isdigit(c)  ((c) >= '0' && (c) <= '9')  argument
269 #define digit_value(c) ((c) - '0')  argument