isnewline
#define isnewline(ch) ((ch) == '\n' || (ch) == '\r' || (ch) == '\f')
#define isnewline(ch) ((ch) == '\n' || (ch) == '\r' || (ch) == '\f')
#define isnewline(ch) ((ch) == '\n' || (ch) == '\r' || (ch) == '\f')
#define isnewline(ch) ((ch) == '\n' || (ch) == '\r' || (ch) == '\f')