Page History

...

The header stdio.h defines the BUFSIZ macro which expands to an integer constant expression that is the size of the buffer used by the setbuf() function. This noncompliant code example defeats the purpose of defining BUFSIZ as a constant by assuming its value in the following expression:

#include <stdio.h>
/* ... */
nblocks = 1 + ((nbytes - 1) >> 9); /* BUFSIZ = 512 = 2^9 */

...

This compliant solution uses the identifier assigned to the constant value in the expression.

#include <stdio.h>
/* ... */
nblocks = 1 + (nbytes - 1) / BUFSIZ;

...