size_t iov_memset(const struct iovec *iov, const unsigned int iov_cnt, size_t iov_off, int fillc, size_t size) { size_t iovec_off, buf_off; unsigned int i; iovec_off = 0; buf_off = 0; for (i = 0; i < iov_cnt && size; i++) { if (iov_off < (iovec_off + iov[i].iov_len)) { size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off , size); memset(iov[i].iov_base + (iov_off - iovec_off), fillc, len); buf_off += len; iov_off += len; size -= len; } iovec_off += iov[i].iov_len; } return buf_off; }