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-- fpconv tests
context("Fpconv printf functions", function()
local ffi = require("ffi")
local u = require "rspamd_util"
local niter_fuzz = 100000
local function small_double()
return math.random()
end
local function large_double()
return math.random() * math.random(2^52)
end
local function huge_double()
return math.random(2^52) * math.random(2^52)
end
local function tiny_double()
return math.random() / math.random(2^52)
end
ffi.cdef[[
int snprintf(char *str, size_t size, const char *format, ...);
long rspamd_snprintf(char *str, size_t size, const char *format, ...);
long rspamd_printf(const char *format, ...);
]]
local benchmarks = {
{'tiny fixed', small_double, '%f'},
{'small fixed', tiny_double, '%f'},
{'large fixed', large_double, '%.3f'},
{'huge fixed', huge_double, '%.3f'},
{'tiny scientific', small_double, '%g'},
{'small scientific', tiny_double, '%g'},
{'large scientific', large_double, '%g'},
{'huge scientific', huge_double, '%g'},
}
local generic = {
{0, '%f', '0'},
{0, '%.1f', '0.0'},
{0, '%.2f', '0.00'},
{0, '%.32f', '0.000000000000000000000000000'}, -- max
{0, '%.150f', '0.000000000000000000000000000'}, -- too large
{1/3, '%f', '0.3333333333333333'},
{1/3, '%.1f', '0.3'},
{1/3, '%.2f', '0.33'},
{-1/3, '%.32f', '-0.333333333333333300000000000'},
{-1/3, '%.150f', '-0.333333333333333300000000000'},
{-3.6817595395344857e-68, '%f', '-3.6817595395344857e-68'},
{3.5844466002796428e+298, '%f', '3.5844466002796428e+298'},
{9223372036854775808, '%f', '9223372036854776000'}, -- 2^63 with precision lost
{2^50 + 0.2, '%f', '1125899906842624.3'}, -- 2^50 with precision lost
{2^50 + 0.2, '%.2f', '1125899906842624.30'}, -- 2^50 with precision lost
{-3.6817595395344857e-68, '%.3f', '-0.000'}, -- not enough precision
{3.5844466002796428e+298, '%.3f', '3.5844466002796428e+298'},
{9223372036854775808, '%.3f', '9223372036854776000.000'}, -- 2^63 with precision lost
{math.huge, '%f', 'inf'},
{-math.huge, '%f', '-inf'},
{0.0/0.0, '%f', 'nan'},
{math.huge, '%.1f', 'inf'},
{-math.huge, '%.2f', '-inf'},
{0.0/0.0, '%.3f', 'nan'},
{math.huge, '%g', 'inf'},
{-math.huge, '%g', '-inf'},
{0.0/0.0, '%g', 'nan'},
}
local buf = ffi.new("char[64]")
local buf2 = ffi.new("char[64]")
for i,c in ipairs(generic) do
test("Generic fp test fmt: " .. c[2] .. '; ' .. tostring(c[1]), function()
ffi.C.rspamd_snprintf(buf, 64, c[2], c[1])
local sbuf = ffi.string(buf)
assert_equal(sbuf, c[3], c[3] .. " but test returned " .. sbuf)
end)
end
for i,c in ipairs(benchmarks) do
test("Fuzz fp test " .. c[1], function()
for _=1,niter_fuzz do
local sign = 1
if math.random() > 0.5 then
sign = -1
end
local d = c[2]() * sign
ffi.C.snprintf(buf, 64, c[3], d)
ffi.C.rspamd_snprintf(buf2, 64, c[3], d)
local sbuf = ffi.string(buf)
local sbuf2 = ffi.string(buf2)
assert_less_than(math.abs(d - tonumber(sbuf2))/math.abs(d),
0.00001,
string.format('rspamd emitted: %s, libc emitted: %s, original number: %g',
sbuf2, sbuf, d))
end
end)
end
end)
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