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rework the history management It was a huge pile of spaghetti with useless utility functions and lots of code reaching into the "data structure" (if you can call it so) to do stuff. Instead, provide a "module" with a clean interface and noone reaching in the insides.
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1 /*

2  * Copyright (c) 2021, 2024 Omar Polo <op@omarpolo.com>

3  *

4  * Permission to use, copy, modify, and distribute this software for any

5  * purpose with or without fee is hereby granted, provided that the above

6  * copyright notice and this permission notice appear in all copies.

7  *

8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

15  */

17 struct hist;

19 #define HIST_LINEAR	0x0

20 #define HIST_WRAP	0x1

22 struct hist	*hist_new(int);

23 void		 hist_free(struct hist *);

24 void		 hist_erase(struct hist *);

26 size_t		 hist_size(struct hist *);

27 size_t		 hist_off(struct hist *);

29 const char	*hist_cur(struct hist *);

30 int		 hist_cur_offs(struct hist *, size_t *, size_t *);

32 int		 hist_set_cur(struct hist *, const char *);

33 int		 hist_set_offs(struct hist *, size_t, size_t);

35 const char	*hist_nth(struct hist *, size_t);

36 const char	*hist_prev(struct hist *);

37 const char	*hist_next(struct hist *);

39 void		 hist_seek_start(struct hist *);

41 int		 hist_push(struct hist *, const char *);

42 int		 hist_prepend(struct hist *, const char *);

43 int		 hist_append(struct hist *, const char *);