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local helpers = require("test.unit.helpers")(after_each)
local itp = helpers.gen_itp(it)
local cimport = helpers.cimport
local cstr = helpers.cstr
local eq = helpers.eq
local ffi = helpers.ffi
local to_cstr = helpers.to_cstr
local cimp = cimport('stdlib.h', './src/nvim/memory.h')
describe('xstrlcat()', function()
local function test_xstrlcat(dst, src, dsize)
assert.is_true(dsize >= 1 + string.len(dst)) -- sanity check for tests
local dst_cstr = cstr(dsize, dst)
local src_cstr = to_cstr(src)
eq(string.len(dst .. src), cimp.xstrlcat(dst_cstr, src_cstr, dsize))
return ffi.string(dst_cstr)
end
local function test_xstrlcat_overlap(dst, src_idx, dsize)
assert.is_true(dsize >= 1 + string.len(dst)) -- sanity check for tests
local dst_cstr = cstr(dsize, dst)
local src_cstr = dst_cstr + src_idx -- pointer into `dst` (overlaps)
eq(string.len(dst) + string.len(dst) - src_idx,
cimp.xstrlcat(dst_cstr, src_cstr, dsize))
return ffi.string(dst_cstr)
end
itp('concatenates strings', function()
eq('ab', test_xstrlcat('a', 'b', 3))
eq('ab', test_xstrlcat('a', 'b', 4096))
eq('ABCיהZdefgiיהZ', test_xstrlcat('ABCיהZ', 'defgiיהZ', 4096))
eq('b', test_xstrlcat('', 'b', 4096))
eq('a', test_xstrlcat('a', '', 4096))
end)
itp('concatenates overlapping strings', function()
eq('abcabc', test_xstrlcat_overlap('abc', 0, 7))
eq('abca', test_xstrlcat_overlap('abc', 0, 5))
eq('abcb', test_xstrlcat_overlap('abc', 1, 5))
eq('abcc', test_xstrlcat_overlap('abc', 2, 10))
eq('abcabc', test_xstrlcat_overlap('abc', 0, 2343))
end)
itp('truncates if `dsize` is too small', function()
eq('a', test_xstrlcat('a', 'b', 2))
eq('', test_xstrlcat('', 'b', 1))
eq('ABCיהZd', test_xstrlcat('ABCיהZ', 'defgiיהZ', 10))
end)
end)
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