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fix(diff): use mmfile_t in linematch

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Problem:

Linematch used to use strchr to navigate a string, however strchr does
not supoprt embedded NULs.

Solution:

Use `mmfile_t` instead of `char *` in linematch and introduce `strnchr()`.

Also remove heap allocations from `matching_char_iwhite()`

Fixes: #30505
(cherry picked from commit c65646c247)
This commit is contained in:
Lewis Russell
2024-09-26 16:10:11 +01:00
parent 045afa9e8a
commit f31e29fce4
9 changed files with 108 additions and 79 deletions
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26
runtime/doc/lua.txt
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@@ -680,8 +680,8 @@ vim.diff({a}, {b}, {opts}) *vim.diff()*
Parameters: ~
• {a} (`string`) First string to compare
• {b} (`string`) Second string to compare
• {opts} (`table`) Optional parameters:
• {on_hunk}
• {opts} (`table?`) Optional parameters:
• {on_hunk}?
(`fun(start_a: integer, count_a: integer, start_b: integer, count_b: integer): integer`)
Invoked for each hunk in the diff. Return a negative number
to cancel the callback for any remaining hunks. Arguments:
@@ -689,33 +689,33 @@ vim.diff({a}, {b}, {opts}) *vim.diff()*
• `count_a` (`integer`): Hunk size in {a}.
• `start_b` (`integer`): Start line of hunk in {b}.
• `count_b` (`integer`): Hunk size in {b}.
• {result_type} (`'unified'|'indices'`, default: `'unified'`)
• {result_type}? (`'unified'|'indices'`, default: `'unified'`)
Form of the returned diff:
• `unified`: String in unified format.
• `indices`: Array of hunk locations. Note: This option is
ignored if `on_hunk` is used.
• {linematch} (`boolean|integer`) Run linematch on the
• {linematch}? (`boolean|integer`) Run linematch on the
resulting hunks from xdiff. When integer, only hunks upto
this size in lines are run through linematch. Requires
`result_type = indices`, ignored otherwise.
• {algorithm} (`'myers'|'minimal'|'patience'|'histogram'`,
• {algorithm}? (`'myers'|'minimal'|'patience'|'histogram'`,
default: `'myers'`) Diff algorithm to use. Values:
• `myers`: the default algorithm
• `minimal`: spend extra time to generate the smallest
possible diff
• `patience`: patience diff algorithm
• `histogram`: histogram diff algorithm
• {ctxlen} (`integer`) Context length
• {interhunkctxlen} (`integer`) Inter hunk context length
• {ignore_whitespace} (`boolean`) Ignore whitespace
• {ignore_whitespace_change} (`boolean`) Ignore whitespace
• {ctxlen}? (`integer`) Context length
• {interhunkctxlen}? (`integer`) Inter hunk context length
• {ignore_whitespace}? (`boolean`) Ignore whitespace
• {ignore_whitespace_change}? (`boolean`) Ignore whitespace
change
• {ignore_whitespace_change_at_eol} (`boolean`) Ignore
• {ignore_whitespace_change_at_eol}? (`boolean`) Ignore
whitespace change at end-of-line.
• {ignore_cr_at_eol} (`boolean`) Ignore carriage return at
• {ignore_cr_at_eol}? (`boolean`) Ignore carriage return at
end-of-line
• {ignore_blank_lines} (`boolean`) Ignore blank lines
• {indent_heuristic} (`boolean`) Use the indent heuristic for
• {ignore_blank_lines}? (`boolean`) Ignore blank lines
• {indent_heuristic}? (`boolean`) Use the indent heuristic for
the internal diff library.
Return: ~