52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
/*
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* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
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*
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* This document is the property of Apple Computer, Inc.
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* It is considered confidential and proprietary.
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*
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* This document may not be reproduced or transmitted in any form,
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* in whole or in part, without the express written permission of
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* Apple Computer, Inc.
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*/
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#ifndef __LIB_CBUF_H
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#define __LIB_CBUF_H
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#include <sys/types.h>
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#include <sys/task.h>
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__BEGIN_DECLS
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/* circular buffer implementation */
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struct cbuf {
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void *buf;
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unsigned int head;
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unsigned int tail;
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size_t has;
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size_t len;
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uint32_t len_mask;
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/* optional event for locking */
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struct task_event *event;
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};
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/* create a circular buffer, len must be power of 2 */
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struct cbuf *cbuf_create(size_t len, struct task_event *event); // event is optional
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void cbuf_destroy(struct cbuf *);
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/* read/write unstructured data */
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ssize_t cbuf_write_raw(struct cbuf *, const void *data, size_t len);
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ssize_t cbuf_read_raw(struct cbuf *, void *data, size_t len);
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/* read/write individual chars */
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ssize_t cbuf_write_char(struct cbuf *, char c);
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ssize_t cbuf_read_char(struct cbuf *, char *c);
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/* read/write strings */
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ssize_t cbuf_write_string(struct cbuf *, const char *str);
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ssize_t cbuf_read_string(struct cbuf *, char *str, size_t maxlen);
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__END_DECLS
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#endif
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