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-rw-r--r--src/nvim/ex_cmds.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/src/nvim/ex_cmds.c b/src/nvim/ex_cmds.c
index f017550dd4..a0618ce7d7 100644
--- a/src/nvim/ex_cmds.c
+++ b/src/nvim/ex_cmds.c
@@ -3953,15 +3953,19 @@ static int do_sub(exarg_T *eap, const proftime_T timeout, const long cmdpreview_
p1 = ml_get(sub_firstlnum + (linenr_T)nmatch - 1);
nmatch_tl += nmatch - 1;
}
- size_t copy_len = (size_t)(regmatch.startpos[0].col - copycol);
+ int copy_len = regmatch.startpos[0].col - copycol;
new_end = sub_grow_buf(&new_start, &new_start_len,
(colnr_T)strlen(p1) - regmatch.endpos[0].col
- + (colnr_T)copy_len + sublen + 1);
+ + copy_len + sublen + 1);
// copy the text up to the part that matched
- memmove(new_end, sub_firstline + copycol, copy_len);
+ memmove(new_end, sub_firstline + copycol, (size_t)copy_len);
new_end += copy_len;
+ if (new_start_len - copy_len < sublen) {
+ sublen = new_start_len - copy_len - 1;
+ }
+
// Finally, at this point we can know where the match actually will
// start in the new text
int start_col = (int)(new_end - new_start);