ALLOCBLKSZ
if ((size = size + (4 - (size % 4))) > ALLOCBLKSZ) {
if ((rtnval = malloc(ALLOCBLKSZ)) == NULL) {
laststraddr = rtnval + ALLOCBLKSZ;
if (nchars > ALLOCBLKSZ) {
if ((nextblkaddr = malloc(ALLOCBLKSZ)) == NULL) {
laststraddr = nextblkaddr + ALLOCBLKSZ - nchars;