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-rw-r--r--iov.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/iov.c b/iov.c
index ae17e7dff6..a81eedcedb 100644
--- a/iov.c
+++ b/iov.c
@@ -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)