75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/*
|
|
Copyright (C) 2009 - 2010
|
|
|
|
Artem Makhutov <artem@makhutov.org>
|
|
http://www.makhutov.org
|
|
|
|
Dmitry Vagin <dmitry2004@yandex.ru>
|
|
*/
|
|
|
|
#ifndef ____RINGBUFFER_H__
|
|
#define ____RINGBUFFER_H__
|
|
|
|
#include <sys/uio.h> /* struct iovec */
|
|
#include "export.h" /* EXPORT_DECL EXPORT_DEF */
|
|
|
|
typedef void * (*rb_write_f)(void* s1, const void* s2, size_t n);
|
|
|
|
struct ringbuffer
|
|
{
|
|
void* buffer; /*!< pointer to data buffer */
|
|
size_t size; /*!< size of buffer */
|
|
size_t used; /*!< number of bytes used */
|
|
size_t read; /*!< read position */
|
|
size_t write; /*!< write position */
|
|
};
|
|
|
|
|
|
INLINE_DECL void rb_init (struct ringbuffer* rb, void* buf, size_t size)
|
|
{
|
|
rb->buffer = buf;
|
|
rb->size = size;
|
|
rb->used = 0;
|
|
rb->read = 0;
|
|
rb->write = 0;
|
|
}
|
|
|
|
INLINE_DECL size_t rb_used (const struct ringbuffer* rb)
|
|
{
|
|
return rb->used;
|
|
}
|
|
|
|
INLINE_DECL size_t rb_free (const struct ringbuffer* rb)
|
|
{
|
|
return rb->size - rb->used;
|
|
}
|
|
|
|
EXPORT_DECL int rb_memcmp (const struct ringbuffer*, const char*, size_t);
|
|
|
|
/*!< fill io vectors array with read data (situable for writev()) and return number of io vectors updated */
|
|
EXPORT_DECL int rb_read_all_iov (const struct ringbuffer* rb, struct iovec iov[2]);
|
|
|
|
/*!< fill io vectors array and return number of io vectors updated for reading len bytes */
|
|
EXPORT_DECL int rb_read_n_iov (const struct ringbuffer* rb, struct iovec* iov, size_t len);
|
|
|
|
EXPORT_DECL int rb_read_until_char_iov (const struct ringbuffer*, struct iovec iov[2], char);
|
|
EXPORT_DECL int rb_read_until_mem_iov (const struct ringbuffer*, struct iovec iov[2], const void*, size_t);
|
|
|
|
/*!< advice read position to len bytes */
|
|
EXPORT_DECL size_t rb_read_upd (struct ringbuffer* rb, size_t len);
|
|
|
|
/*!< fill io vectors array with free data (situable for readv()) and return number of io vectors updated */
|
|
EXPORT_DECL int rb_write_iov (const struct ringbuffer*, struct iovec iov[2]);
|
|
|
|
/*!< advice write position to len bytes */
|
|
EXPORT_DECL size_t rb_write_upd (struct ringbuffer*, size_t);
|
|
|
|
EXPORT_DEF size_t rb_write_core (struct ringbuffer* rb, const char* buf, size_t len, rb_write_f method);
|
|
|
|
INLINE_DECL size_t rb_write (struct ringbuffer* rb, const char* buf, size_t len)
|
|
{
|
|
return rb_write_core(rb, buf, len, memmove);
|
|
}
|
|
|
|
#endif /* ____RINGBUFFER_H__ */
|