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char *p = /* Initialize; may or may not be NULL */

if (p || (p = (char *) malloc(BUF_SIZE)) ) {
  /* Do stuff withPerform some computation based on p */
  free(p);
  p = NULL;
} else {
  /* Handle malloc() error */
  return;
}

char *p;
char *q = NULL;
if (p == NULL) {
  q = (char *) malloc(BUF_SIZE);
  p = q;
}
if (p == NULL) {
  /* Handle malloc() error */
  return;
}

/* Perform Dosome computation stuffbased withon p */
free(q);
q = NULL;