Patch 8.2.1561

[Bram Moolenaar]

Patch 8.2.1561
Problem: Using NULL pointers in fold code.
Solution: Avoid using a NULL pointer. (Dominique Pellé, closes #6831,
closes #6831)
Files: src/fold.c


*** ../vim-8.2.1560/src/fold.c 2020-09-01 19:56:10.928571016 +0200
--- src/fold.c 2020-09-01 21:12:16.267563378 +0200
***************
*** 3059,3065 ****
}

#define fold_end(fp) ((fp)->fd_top + (fp)->fd_len - 1)
! #define valid_fold(fp, gap) ((fp) < ((fold_T *)(gap)->ga_data + (gap)->ga_len))
#define fold_index(fp, gap) ((size_t)(fp - ((fold_T *)(gap)->ga_data)))

void
--- 3059,3065 ----
}

#define fold_end(fp) ((fp)->fd_top + (fp)->fd_len - 1)
! #define valid_fold(fp, gap) ((gap)->ga_len > 0 && (fp) < ((fold_T *)(gap)->ga_data + (gap)->ga_len))
#define fold_index(fp, gap) ((size_t)(fp - ((fold_T *)(gap)->ga_data)))

void
*** ../vim-8.2.1560/src/version.c 2020-09-01 19:56:10.928571016 +0200
--- src/version.c 2020-09-01 21:19:42.146168980 +0200
***************
*** 756,757 ****
--- 756,759 ----
{ /* Add new patch number below this line */
+ /**/
+ 1561,
/**/

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