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https://github.com/samba-team/samba.git
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a9c53b9eff
The main reason for this change was the use of iov_advance() in the next commits in source3/smbd/smb2_server.c And the function calls to iov_advance() showed up in profiling with callgrind. While there iov_buf() and iov_buflen() are moved as well, as they are also used there. Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
/*
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* Unix SMB/CIFS implementation.
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* Samba system utilities
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* Copyright (C) Volker Lendecke 2014
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __LIB_IOV_BUF_H__
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#define __LIB_IOV_BUF_H__
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#include "replace.h"
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#include <talloc.h>
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#include "system/filesys.h"
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static inline
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ssize_t iov_buf(const struct iovec *iov, int iovcnt,
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uint8_t *buf, size_t buflen)
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{
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size_t needed = 0;
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uint8_t *p = buf;
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int i;
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for (i=0; i<iovcnt; i++) {
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size_t thislen = iov[i].iov_len;
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size_t tmp;
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tmp = needed + thislen;
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if (tmp < needed) {
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/* wrap */
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return -1;
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}
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needed = tmp;
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if ((p != NULL) && needed <= buflen && thislen > 0) {
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memcpy(p, iov[i].iov_base, thislen);
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p += thislen;
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}
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}
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return needed;
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}
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static inline
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ssize_t iov_buflen(const struct iovec *iov, int iovcnt)
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{
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return iov_buf(iov, iovcnt, NULL, 0);
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}
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static inline
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bool iov_advance(struct iovec **iov, int *iovcnt, size_t n)
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{
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struct iovec *v = *iov;
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int cnt = *iovcnt;
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while (n > 0) {
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if (cnt == 0) {
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return false;
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}
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if (n < v->iov_len) {
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v->iov_base = (char *)v->iov_base + n;
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v->iov_len -= n;
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break;
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}
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n -= v->iov_len;
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v += 1;
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cnt -= 1;
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}
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/*
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* Skip 0-length iovec's
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*
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* There might be empty buffers at the end of iov. Next time we do a
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* readv/writev based on this iov would give 0 transferred bytes, also
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* known as EPIPE. So we need to be careful discarding them.
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*/
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while ((cnt > 0) && (v->iov_len == 0)) {
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v += 1;
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cnt -= 1;
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}
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*iov = v;
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*iovcnt = cnt;
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return true;
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}
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uint8_t *iov_concat(TALLOC_CTX *mem_ctx, const struct iovec *iov, int count);
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#endif
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