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https://github.com/projectacrn/acrn-hypervisor.git
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8b16be9185
Many of the license and Intel copyright headers include the "All rights reserved" string. It is not relevant in the context of the BSD-3-Clause license that the code is released under. This patch removes those strings throughout the code (hypervisor, devicemodel and misc). Tracked-On: #7254 Signed-off-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>
83 lines
1.5 KiB
C
83 lines
1.5 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <asm/errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include "sbuf.h"
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#include <errno.h>
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static inline bool sbuf_is_empty(shared_buf_t *sbuf)
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{
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return (sbuf->head == sbuf->tail);
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}
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static inline uint32_t sbuf_next_ptr(uint32_t pos,
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uint32_t span, uint32_t scope)
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{
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pos += span;
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pos = (pos >= scope) ? (pos - scope) : pos;
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return pos;
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}
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int sbuf_get(shared_buf_t *sbuf, uint8_t *data)
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{
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const void *from;
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if ((sbuf == NULL) || (data == NULL))
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return -EINVAL;
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if (sbuf_is_empty(sbuf)) {
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/* no data available */
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return 0;
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}
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from = (void *)sbuf + SBUF_HEAD_SIZE + sbuf->head;
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memcpy(data, from, sbuf->ele_size);
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sbuf->head = sbuf_next_ptr(sbuf->head, sbuf->ele_size, sbuf->size);
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return sbuf->ele_size;
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}
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int sbuf_write(int fd, shared_buf_t *sbuf)
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{
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const void *start;
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int written;
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if (sbuf == NULL)
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return -EINVAL;
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if (sbuf_is_empty(sbuf)) {
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return 0;
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}
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start = (void *)sbuf + SBUF_HEAD_SIZE + sbuf->head;
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written = write(fd, start, sbuf->ele_size);
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if (written != sbuf->ele_size) {
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printf("Failed to write: ret %d (ele_size %d), errno %d\n",
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written, sbuf->ele_size, (written == -1) ? errno : 0);
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return -1;
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}
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sbuf->head = sbuf_next_ptr(sbuf->head, sbuf->ele_size, sbuf->size);
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return sbuf->ele_size;
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}
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int sbuf_clear_buffered(shared_buf_t *sbuf)
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{
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if (sbuf == NULL)
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return -EINVAL;
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sbuf->head = sbuf->tail;
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return 0;
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}
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