ISREG
#define ISREG(A) ((A.st_mode & S_IFMT) == S_IFREG)
#define ISREG(A) (((A).st_mode & S_IFMT) == S_IFREG)
#define ISREG(A) ((A.st_mode & S_IFMT) == S_IFREG)
#define ISREG(A) ((A.st_mode & S_IFMT) == S_IFREG)