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65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
#pragma once
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#include <string.h>
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/**
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* Ringbuffer structure
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*
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*/
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struct ringbuf {
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char *buf; ///< Pointer to buffer memory
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unsigned bufsize; ///< Size of buffer memory
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volatile unsigned pos; ///< Current read position
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volatile unsigned len; ///< Length of data in buffer
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};
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#define RINGBUF(size) \
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{ .buf = (char[(size)]){0}, .bufsize = (size) }
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/**
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* Read a single byte from a buffer
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*
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* \param rb pointer to ringbuffer struct
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* \param data pointer to data byte
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* \return number of bytes read (0 if buffer was empty)
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*/
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int rb_getc(struct ringbuf *rb, char *data);
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/**
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* Write a single byte to a buffer
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*
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* \param rb pointer to ringbuffer struct
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* \param data pointer to data byte
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* \return number of bytes written (0 if buffer was full)
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*/
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int rb_putc(struct ringbuf *rb, const char data);
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/**
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* Read from a buffer
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*
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*/
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int rb_read(struct ringbuf *rb, void *data, int len);
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/**
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* Write to a buffer
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*
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* \param rb pointer to ringbuffer struct
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* \param data pointer to data byte
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* \return number of bytes written (0 if buffer was full)
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*
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*/
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int rb_write(struct ringbuf *rb, const void *data, int len);
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/**
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* undo rb_read
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*
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* \param rb pointer to ringbuffer struct
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* \param len length to reset read pointer
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* \return 0 on error
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*
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*/
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int rb_undo(struct ringbuf *rb, int len);
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int rb_getline(struct ringbuf *rb, char *ptr, int len);
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