diff options
Diffstat (limited to 'iov.c')
-rw-r--r-- | iov.c | 23 |
1 files changed, 23 insertions, 0 deletions
@@ -229,6 +229,29 @@ void iov_hexdump(const struct iovec *iov, const unsigned int iov_cnt, } } +unsigned iov_copy(struct iovec *dst_iov, unsigned int dst_iov_cnt, + const struct iovec *iov, unsigned int iov_cnt, + size_t offset, size_t bytes) +{ + size_t len; + unsigned int i, j; + for (i = 0, j = 0; i < iov_cnt && j < dst_iov_cnt && bytes; i++) { + if (offset >= iov[i].iov_len) { + offset -= iov[i].iov_len; + continue; + } + len = MIN(bytes, iov[i].iov_len - offset); + + dst_iov[j].iov_base = iov[i].iov_base + offset; + dst_iov[j].iov_len = len; + j++; + bytes -= len; + offset = 0; + } + assert(offset == 0); + return j; +} + /* io vectors */ void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint) |