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a0ca767db6
Trivia: I wrote this ring buffer implementation in half an hour during a Google interview and it somehow works better than the old one which took me half a day.
32 lines
897 B
C
32 lines
897 B
C
#ifndef UTIL_FIFO_H
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#define UTIL_FIFO_H
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#include <sys/types.h>
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struct fifo {
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char *buf;
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size_t capacity;
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size_t size;
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size_t start;
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};
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#define FIFO_INIT(b) ((struct fifo) {.buf = b, .capacity = sizeof(b)})
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void fifo_init(struct fifo *fifo, size_t capacity);
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void fifo_destroy(struct fifo *fifo);
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size_t fifo_capacity(struct fifo *fifo);
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size_t fifo_size(struct fifo *fifo);
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size_t fifo_remaining(struct fifo *fifo);
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// return 0 on success, 1 if size > fifo_remaining and FIFO_OVERWRITE was not specified
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#define FIFO_OVERWRITE 1
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int fifo_write(struct fifo *fifo, const void *data, size_t size, int flags);
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// return 0 on success, 1 if size > fifo_size
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#define FIFO_PEEK 1 // don't remove the bytes
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#define FIFO_LAST 2 // return bytes from the end, not the start
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int fifo_read(struct fifo *fifo, void *buf, size_t size, int flags);
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void fifo_flush(struct fifo *fifo);
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#endif
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