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-rw-r--r--iov.c422
1 files changed, 0 insertions, 422 deletions
diff --git a/iov.c b/iov.c
deleted file mode 100644
index c0f5c56618..0000000000
--- a/iov.c
+++ /dev/null
@@ -1,422 +0,0 @@
-/*
- * Helpers for getting linearized buffers from iov / filling buffers into iovs
- *
- * Copyright IBM, Corp. 2007, 2008
- * Copyright (C) 2010 Red Hat, Inc.
- *
- * Author(s):
- * Anthony Liguori <aliguori@us.ibm.com>
- * Amit Shah <amit.shah@redhat.com>
- * Michael Tokarev <mjt@tls.msk.ru>
- *
- * This work is licensed under the terms of the GNU GPL, version 2. See
- * the COPYING file in the top-level directory.
- *
- * Contributions after 2012-01-13 are licensed under the terms of the
- * GNU GPL, version 2 or (at your option) any later version.
- */
-
-#include "qemu/iov.h"
-
-#ifdef _WIN32
-# include <windows.h>
-# include <winsock2.h>
-#else
-# include <sys/types.h>
-# include <sys/socket.h>
-#endif
-
-size_t iov_from_buf(const struct iovec *iov, unsigned int iov_cnt,
- size_t offset, const void *buf, size_t bytes)
-{
- size_t done;
- unsigned int i;
- for (i = 0, done = 0; (offset || done < bytes) && i < iov_cnt; i++) {
- if (offset < iov[i].iov_len) {
- size_t len = MIN(iov[i].iov_len - offset, bytes - done);
- memcpy(iov[i].iov_base + offset, buf + done, len);
- done += len;
- offset = 0;
- } else {
- offset -= iov[i].iov_len;
- }
- }
- assert(offset == 0);
- return done;
-}
-
-size_t iov_to_buf(const struct iovec *iov, const unsigned int iov_cnt,
- size_t offset, void *buf, size_t bytes)
-{
- size_t done;
- unsigned int i;
- for (i = 0, done = 0; (offset || done < bytes) && i < iov_cnt; i++) {
- if (offset < iov[i].iov_len) {
- size_t len = MIN(iov[i].iov_len - offset, bytes - done);
- memcpy(buf + done, iov[i].iov_base + offset, len);
- done += len;
- offset = 0;
- } else {
- offset -= iov[i].iov_len;
- }
- }
- assert(offset == 0);
- return done;
-}
-
-size_t iov_memset(const struct iovec *iov, const unsigned int iov_cnt,
- size_t offset, int fillc, size_t bytes)
-{
- size_t done;
- unsigned int i;
- for (i = 0, done = 0; (offset || done < bytes) && i < iov_cnt; i++) {
- if (offset < iov[i].iov_len) {
- size_t len = MIN(iov[i].iov_len - offset, bytes - done);
- memset(iov[i].iov_base + offset, fillc, len);
- done += len;
- offset = 0;
- } else {
- offset -= iov[i].iov_len;
- }
- }
- assert(offset == 0);
- return done;
-}
-
-size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt)
-{
- size_t len;
- unsigned int i;
-
- len = 0;
- for (i = 0; i < iov_cnt; i++) {
- len += iov[i].iov_len;
- }
- return len;
-}
-
-/* helper function for iov_send_recv() */
-static ssize_t
-do_send_recv(int sockfd, struct iovec *iov, unsigned iov_cnt, bool do_send)
-{
-#if defined CONFIG_IOVEC && defined CONFIG_POSIX
- ssize_t ret;
- struct msghdr msg;
- memset(&msg, 0, sizeof(msg));
- msg.msg_iov = iov;
- msg.msg_iovlen = iov_cnt;
- do {
- ret = do_send
- ? sendmsg(sockfd, &msg, 0)
- : recvmsg(sockfd, &msg, 0);
- } while (ret < 0 && errno == EINTR);
- return ret;
-#else
- /* else send piece-by-piece */
- /*XXX Note: windows has WSASend() and WSARecv() */
- unsigned i = 0;
- ssize_t ret = 0;
- while (i < iov_cnt) {
- ssize_t r = do_send
- ? send(sockfd, iov[i].iov_base, iov[i].iov_len, 0)
- : recv(sockfd, iov[i].iov_base, iov[i].iov_len, 0);
- if (r > 0) {
- ret += r;
- } else if (!r) {
- break;
- } else if (errno == EINTR) {
- continue;
- } else {
- /* else it is some "other" error,
- * only return if there was no data processed. */
- if (ret == 0) {
- ret = -1;
- }
- break;
- }
- i++;
- }
- return ret;
-#endif
-}
-
-ssize_t iov_send_recv(int sockfd, struct iovec *iov, unsigned iov_cnt,
- size_t offset, size_t bytes,
- bool do_send)
-{
- ssize_t ret;
- unsigned si, ei; /* start and end indexes */
- if (bytes == 0) {
- /* Catch the do-nothing case early, as otherwise we will pass an
- * empty iovec to sendmsg/recvmsg(), and not all implementations
- * accept this.
- */
- return 0;
- }
-
- /* Find the start position, skipping `offset' bytes:
- * first, skip all full-sized vector elements, */
- for (si = 0; si < iov_cnt && offset >= iov[si].iov_len; ++si) {
- offset -= iov[si].iov_len;
- }
- if (offset) {
- assert(si < iov_cnt);
- /* second, skip `offset' bytes from the (now) first element,
- * undo it on exit */
- iov[si].iov_base += offset;
- iov[si].iov_len -= offset;
- }
- /* Find the end position skipping `bytes' bytes: */
- /* first, skip all full-sized elements */
- for (ei = si; ei < iov_cnt && iov[ei].iov_len <= bytes; ++ei) {
- bytes -= iov[ei].iov_len;
- }
- if (bytes) {
- /* second, fixup the last element, and remember
- * the length we've cut from the end of it in `bytes' */
- size_t tail;
- assert(ei < iov_cnt);
- assert(iov[ei].iov_len > bytes);
- tail = iov[ei].iov_len - bytes;
- iov[ei].iov_len = bytes;
- bytes = tail; /* bytes is now equal to the tail size */
- ++ei;
- }
-
- ret = do_send_recv(sockfd, iov + si, ei - si, do_send);
-
- /* Undo the changes above */
- if (offset) {
- iov[si].iov_base -= offset;
- iov[si].iov_len += offset;
- }
- if (bytes) {
- iov[ei-1].iov_len += bytes;
- }
-
- return ret;
-}
-
-
-void iov_hexdump(const struct iovec *iov, const unsigned int iov_cnt,
- FILE *fp, const char *prefix, size_t limit)
-{
- unsigned int i, v, b;
- uint8_t *c;
-
- c = iov[0].iov_base;
- for (i = 0, v = 0, b = 0; b < limit; i++, b++) {
- if (i == iov[v].iov_len) {
- i = 0; v++;
- if (v == iov_cnt) {
- break;
- }
- c = iov[v].iov_base;
- }
- if ((b % 16) == 0) {
- fprintf(fp, "%s: %04x:", prefix, b);
- }
- if ((b % 4) == 0) {
- fprintf(fp, " ");
- }
- fprintf(fp, " %02x", c[i]);
- if ((b % 16) == 15) {
- fprintf(fp, "\n");
- }
- }
- if ((b % 16) != 0) {
- fprintf(fp, "\n");
- }
-}
-
-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)
-{
- qiov->iov = g_malloc(alloc_hint * sizeof(struct iovec));
- qiov->niov = 0;
- qiov->nalloc = alloc_hint;
- qiov->size = 0;
-}
-
-void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov)
-{
- int i;
-
- qiov->iov = iov;
- qiov->niov = niov;
- qiov->nalloc = -1;
- qiov->size = 0;
- for (i = 0; i < niov; i++)
- qiov->size += iov[i].iov_len;
-}
-
-void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len)
-{
- assert(qiov->nalloc != -1);
-
- if (qiov->niov == qiov->nalloc) {
- qiov->nalloc = 2 * qiov->nalloc + 1;
- qiov->iov = g_realloc(qiov->iov, qiov->nalloc * sizeof(struct iovec));
- }
- qiov->iov[qiov->niov].iov_base = base;
- qiov->iov[qiov->niov].iov_len = len;
- qiov->size += len;
- ++qiov->niov;
-}
-
-/*
- * Concatenates (partial) iovecs from src_iov to the end of dst.
- * It starts copying after skipping `soffset' bytes at the
- * beginning of src and adds individual vectors from src to
- * dst copies up to `sbytes' bytes total, or up to the end
- * of src_iov if it comes first. This way, it is okay to specify
- * very large value for `sbytes' to indicate "up to the end
- * of src".
- * Only vector pointers are processed, not the actual data buffers.
- */
-void qemu_iovec_concat_iov(QEMUIOVector *dst,
- struct iovec *src_iov, unsigned int src_cnt,
- size_t soffset, size_t sbytes)
-{
- int i;
- size_t done;
- assert(dst->nalloc != -1);
- for (i = 0, done = 0; done < sbytes && i < src_cnt; i++) {
- if (soffset < src_iov[i].iov_len) {
- size_t len = MIN(src_iov[i].iov_len - soffset, sbytes - done);
- qemu_iovec_add(dst, src_iov[i].iov_base + soffset, len);
- done += len;
- soffset = 0;
- } else {
- soffset -= src_iov[i].iov_len;
- }
- }
- assert(soffset == 0); /* offset beyond end of src */
-}
-
-/*
- * Concatenates (partial) iovecs from src to the end of dst.
- * It starts copying after skipping `soffset' bytes at the
- * beginning of src and adds individual vectors from src to
- * dst copies up to `sbytes' bytes total, or up to the end
- * of src if it comes first. This way, it is okay to specify
- * very large value for `sbytes' to indicate "up to the end
- * of src".
- * Only vector pointers are processed, not the actual data buffers.
- */
-void qemu_iovec_concat(QEMUIOVector *dst,
- QEMUIOVector *src, size_t soffset, size_t sbytes)
-{
- qemu_iovec_concat_iov(dst, src->iov, src->niov, soffset, sbytes);
-}
-
-void qemu_iovec_destroy(QEMUIOVector *qiov)
-{
- assert(qiov->nalloc != -1);
-
- qemu_iovec_reset(qiov);
- g_free(qiov->iov);
- qiov->nalloc = 0;
- qiov->iov = NULL;
-}
-
-void qemu_iovec_reset(QEMUIOVector *qiov)
-{
- assert(qiov->nalloc != -1);
-
- qiov->niov = 0;
- qiov->size = 0;
-}
-
-size_t qemu_iovec_to_buf(QEMUIOVector *qiov, size_t offset,
- void *buf, size_t bytes)
-{
- return iov_to_buf(qiov->iov, qiov->niov, offset, buf, bytes);
-}
-
-size_t qemu_iovec_from_buf(QEMUIOVector *qiov, size_t offset,
- const void *buf, size_t bytes)
-{
- return iov_from_buf(qiov->iov, qiov->niov, offset, buf, bytes);
-}
-
-size_t qemu_iovec_memset(QEMUIOVector *qiov, size_t offset,
- int fillc, size_t bytes)
-{
- return iov_memset(qiov->iov, qiov->niov, offset, fillc, bytes);
-}
-
-size_t iov_discard_front(struct iovec **iov, unsigned int *iov_cnt,
- size_t bytes)
-{
- size_t total = 0;
- struct iovec *cur;
-
- for (cur = *iov; *iov_cnt > 0; cur++) {
- if (cur->iov_len > bytes) {
- cur->iov_base += bytes;
- cur->iov_len -= bytes;
- total += bytes;
- break;
- }
-
- bytes -= cur->iov_len;
- total += cur->iov_len;
- *iov_cnt -= 1;
- }
-
- *iov = cur;
- return total;
-}
-
-size_t iov_discard_back(struct iovec *iov, unsigned int *iov_cnt,
- size_t bytes)
-{
- size_t total = 0;
- struct iovec *cur;
-
- if (*iov_cnt == 0) {
- return 0;
- }
-
- cur = iov + (*iov_cnt - 1);
-
- while (*iov_cnt > 0) {
- if (cur->iov_len > bytes) {
- cur->iov_len -= bytes;
- total += bytes;
- break;
- }
-
- bytes -= cur->iov_len;
- total += cur->iov_len;
- cur--;
- *iov_cnt -= 1;
- }
-
- return total;
-}
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