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NAME

reallocarr — reallocate array

SYNOPSIS

#include <stdlib.h>

int
reallocarr(void *ptr, size_t number, size_t size);

RETURN VALUES

On successful completion, returns 0 and updates *ptr. Otherwise, an error code (see errno(2)) is returned and *ptr and the referenced memory is unmodified.

EXAMPLES

The following uses reallocarr() to initialize an array of INITSIZE integers, then resizes it to NEWSIZE elements:

int *data = NULL;
int ret = 0;

ret = reallocarr(&data, INITSIZE, sizeof(*data));
if (ret)
    errc(1, ret, "reallocarr failed");

ret = reallocarr(&data, NEWSIZE, sizeof(*data));
if (ret)
    errc(1, ret, "reallocarr failed on resize");

SEE ALSO

calloc(3)

HISTORY

reallocarr first appeared in NetBSD 7.0. OpenBSD introduced the reallocarray(3) function for the same purpose, but the interface makes it difficult to correctly handle zero-sized allocations.