roundup(3) Library Functions Manual roundup(3)
NAME
roundup - round up in steps
LIBRARY
Standard C library (libc)
SYNOPSIS
#include <sys/param.h>
roundup(x, step);
DESCRIPTION
This macro rounds x to the nearest multiple of step that is not less
than x.
It is typically used for rounding up a pointer to align it or increas-
ing a buffer to be allocated.
This API is not designed to be generic, and doesn't work in some cases
that are not important for the typical use cases described above. See
CAVEATS.
RETURN VALUE
This macro returns the rounded value.
STANDARDS
This nonstandard macro is present in glibc and some BSDs.
CAVEATS
The arguments may be evaluated more than once.
x should be nonnegative, and step should be positive.
If x + step would overflow or wrap around, the behavior is undefined.
SEE ALSO
ceil(3), floor(3), lrint(3), rint(3), lround(3), round(3)
Linux man-pages 6.03 2023-01-19 roundup(3)
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