86 lines
1.7 KiB
C
Executable File
86 lines
1.7 KiB
C
Executable File
#ifndef UTIL_FIFO_H
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#define UTIL_FIFO_H
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#include <stddef.h>
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#include <util/atomic.h>
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typedef struct FIFOBuffer
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{
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unsigned char *begin;
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unsigned char *end;
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unsigned char * volatile head;
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unsigned char * volatile tail;
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} FIFOBuffer;
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inline bool fifo_isempty(const FIFOBuffer *f) {
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return f->head == f->tail;
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}
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inline bool fifo_isfull(const FIFOBuffer *f) {
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return ((f->head == f->begin) && (f->tail == f->end)) || (f->tail == f->head - 1);
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}
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inline void fifo_push(FIFOBuffer *f, unsigned char c) {
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*(f->tail) = c;
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if (f->tail == f->end) {
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f->tail = f->begin;
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} else {
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f->tail++;
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}
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}
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inline unsigned char fifo_pop(FIFOBuffer *f) {
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if(f->head == f->end) {
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f->head = f->begin;
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return *(f->end);
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} else {
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return *(f->head++);
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}
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}
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inline void fifo_flush(FIFOBuffer *f) {
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f->head = f->tail;
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}
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static inline bool fifo_isempty_locked(const FIFOBuffer *f) {
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bool result;
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
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result = fifo_isempty(f);
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}
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return result;
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}
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static inline bool fifo_isfull_locked(const FIFOBuffer *f) {
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bool result;
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
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result = fifo_isfull(f);
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}
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return result;
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}
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static inline void fifo_push_locked(FIFOBuffer *f, unsigned char c) {
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
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fifo_push(f, c);
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}
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}
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static inline unsigned char fifo_pop_locked(FIFOBuffer *f) {
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unsigned char c;
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
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c = fifo_pop(f);
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}
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return c;
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}
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inline void fifo_init(FIFOBuffer *f, unsigned char *buffer, size_t size) {
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f->head = f->tail = f->begin = buffer;
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f->end = buffer + size;
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}
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inline size_t fifo_len(FIFOBuffer *f) {
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return f->end - f->begin;
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}
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#endif
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