Improve handling of overlong single lines#19332
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Problem: ml_append_int() crashes when appending lines near MAXCOL
length due to signed integer overflow in space_needed
calculation.
Solution: Change 'space_needed' from int to long to handle the
'len + INDEX_SIZE' computation without overflow. Update
db_free comparison casts from (int) to (long) to match.
Note: supported by AI claude
related: vim#17935
related: vim#18953
Signed-off-by: Christian Brabandt <cb@256bit.org>
…rflow
Problem: Reading files with lines approaching MAXCOL length crashes
with segfault due to colnr_T overflow.
Solution: The split check 'linerest >= MAXCOL' fired too late because
linerest could grow by up to 'size' bytes before the next
check. Change threshold to 'linerest >= MAXCOL - size' to
ensure the line passed to ml_append() stays within colnr_T
range.
fixes: vim#17935
closes: vim#18953
Note: supported by AI claude
Signed-off-by: Christian Brabandt <cb@256bit.org>
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Problem: reading files with very long lines crashes Vim
Solution: break long lines, use (long) instead of (int) to handle
the line length so that it doesn't overflow
fixes: #17935
related: #18953
Note: I used Claude to help with this.