1roundup(3)                 Library Functions Manual                 roundup(3)
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NAME

6       roundup - round up in steps
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LIBRARY

9       Standard C library (libc)
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SYNOPSIS

12       #include <sys/param.h>
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14       roundup(x, step);
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DESCRIPTION

17       This  macro  rounds  x to the nearest multiple of step that is not less
18       than x.
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20       It is typically used for rounding up a pointer to align it or  increas‐
21       ing a buffer to be allocated.
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23       This  API is not designed to be generic, and doesn't work in some cases
24       that are not important for the typical use cases described above.   See
25       CAVEATS.
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RETURN VALUE

28       This macro returns the rounded value.
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STANDARDS

31       None.
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CAVEATS

34       The arguments may be evaluated more than once.
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36       x should be nonnegative, and step should be positive.
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38       If x + step would overflow or wrap around, the behavior is undefined.
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SEE ALSO

41       ceil(3), floor(3), lrint(3), rint(3), lround(3), round(3)
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45Linux man-pages 6.04              2023-03-30                        roundup(3)