Compat

Overflow-checked array allocation used by the containers. Available on every supported platform.

Usage

Call lf_reallocarray() with the element count and element size. Pass NULL to allocate a new array.

int *values = lf_reallocarray(NULL, 16, sizeof(int));
if (values != NULL) {
    int *grown = lf_reallocarray(values, 32, sizeof(int));
    if (grown != NULL) {
        values = grown;
    }
    free(values);
}

For a nonzero allocation size, a failed call leaves the original allocation yours to free. Store the result in a temporary pointer when growing an existing array.

Functions

lf_reallocarray

Reallocates memory for nmemb elements of size bytes each. Checks for multiplication overflow before calling realloc(). Returns NULL on overflow or allocation failure and sets errno to ENOMEM. A zero count or element size follows the platform's realloc(ptr, 0) behavior.

The prefixed name avoids conflicts with libc, libbsd, and SDK declarations of reallocarray().

void *lf_reallocarray(void *ptr, size_t nmemb, size_t size);