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ring.h 1.5KB

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  1. /*
  2. * ring.h
  3. *
  4. * Copyright (c) 2023 Thomas Buck (thomas@xythobuz.de)
  5. *
  6. * This program is free software: you can redistribute it and/or modify
  7. * it under the terms of the GNU General Public License as published by
  8. * the Free Software Foundation, either version 3 of the License, or
  9. * (at your option) any later version.
  10. *
  11. * This program is distributed in the hope that it will be useful,
  12. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14. * GNU General Public License for more details.
  15. *
  16. * See <http://www.gnu.org/licenses/>.
  17. */
  18. #ifndef __RING_BUFFER_H__
  19. #define __RING_BUFFER_H__
  20. #include <stddef.h>
  21. #include <stdint.h>
  22. #include <stdbool.h>
  23. struct ring_buffer {
  24. void *buffer;
  25. size_t size;
  26. size_t el_len;
  27. size_t head, tail;
  28. bool full;
  29. };
  30. #define RB_INIT(b, s, e) { .buffer = b, .size = s, .el_len = e, .head = 0, .tail = 0, .full = false }
  31. void rb_add(struct ring_buffer *rb, const void *data, size_t length);
  32. #define rb_push(rb, v) rb_add(rb, v, 1)
  33. size_t rb_len(struct ring_buffer *rb);
  34. #define rb_space(rb) ((rb)->size - rb_len(rb))
  35. void rb_dump(struct ring_buffer *rb, void (*write)(const void *, size_t), size_t skip);
  36. void rb_move(struct ring_buffer *rb, void (*write)(const void *, size_t));
  37. void rb_peek(struct ring_buffer *rb, void *buf);
  38. void rb_pop(struct ring_buffer *rb, void *buf);
  39. size_t rb_get(struct ring_buffer *rb, void *data, size_t length);
  40. #endif // __RING_BUFFER_H__