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fix(diff): handle long lines without crashing (#21389)

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Fixes https://github.com/neovim/neovim/issues/21388
This commit is contained in:
Lewis Russell
2022-12-12 16:44:11 +00:00
committed by GitHub
parent 49c240d3a2
commit d40d34aaa5
2 changed files with 23 additions and 9 deletions
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6
src/nvim/linematch.c
View File

@@ -85,7 +85,7 @@ static void update_path_flat(diffcmppath_T *diffcmppath, int score, size_t to, s
diffcmppath[to].df_path_idx = path_idx + 1;
}
#define MATCH_CHAR_MAX_LEN 500
#define MATCH_CHAR_MAX_LEN 800
/// Return matching characters between "s1" and "s2" whilst respecting sequence order.
/// Consider the case of two strings 'AAACCC' and 'CCCAAA', the
@@ -102,8 +102,8 @@ static void update_path_flat(diffcmppath_T *diffcmppath, int score, size_t to, s
/// @param s2
static int matching_chars(const char *s1, const char *s2)
{
size_t s1len = MIN(MATCH_CHAR_MAX_LEN, line_len(s1));
size_t s2len = MIN(MATCH_CHAR_MAX_LEN, line_len(s2));
size_t s1len = MIN(MATCH_CHAR_MAX_LEN - 1, line_len(s1));
size_t s2len = MIN(MATCH_CHAR_MAX_LEN - 1, line_len(s2));
int matrix[2][MATCH_CHAR_MAX_LEN] = { 0 };
bool icur = 1; // save space by storing only two rows for i axis
for (size_t i = 0; i < s1len; i++) {

22
test/functional/ui/linematch_spec.lua
View File

@@ -52,9 +52,8 @@ describe('Diff mode screen with 3 diffs open', function()
})
feed('<c-w>=')
feed(':windo set nu!<cr>')
end)
describe('setup the diff screen to look like a merge conflict with 3 files in diff mode', function()
before_each(function()
@@ -252,9 +251,8 @@ describe('Diff mode screen with 2 diffs open', function()
})
feed('<c-w>=')
feed(':windo set nu!<cr>')
end)
describe('setup a diff with 2 files and set linematch:30', function()
before_each(function()
feed(':set diffopt+=linematch:30<cr>')
@@ -979,3 +977,19 @@ something
end)
end)
end)
describe('regressions', function()
local screen
it("doesn't crash with long lines", function()
clear()
feed(':set diffopt+=linematch:30<cr>')
screen = Screen.new(100, 20)
screen:attach()
-- line must be greater than MATCH_CHAR_MAX_LEN
helpers.curbufmeths.set_lines(0, -1, false, { string.rep('a', 1000)..'hello' })
helpers.exec 'vnew'
helpers.curbufmeths.set_lines(0, -1, false, { string.rep('a', 1010)..'world' })
helpers.exec 'windo diffthis'
end)
end)