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// Copyright 2022 The Abseil Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This program tests the absl::SimpleAtod and absl::SimpleAtof functions. Run
// it as "atod_manual_test pnftd/data/*.txt" where the pnftd directory is a
// local checkout of the https://github.com/nigeltao/parse-number-fxx-test-data
// repository. The test suite lives in a separate repository because its more
// than 5 million test cases weigh over several hundred megabytes and because
// the test cases are also useful to other software projects, not just Abseil.
// Its data/*.txt files contain one test case per line, like:
//
// 3C00 3F800000 3FF0000000000000 1
// 3D00 3FA00000 3FF4000000000000 1.25
// 3D9A 3FB33333 3FF6666666666666 1.4
// 57B7 42F6E979 405EDD2F1A9FBE77 123.456
// 622A 44454000 4088A80000000000 789
// 7C00 7F800000 7FF0000000000000 123.456e789
//
// For each line (and using 0-based column indexes), columns [5..13] and
// [14..30] contain the 32-bit float and 64-bit double result of parsing
// columns [31..].
//
// For example, parsing "1.4" as a float gives the bits 0x3FB33333.
//
// In this 6-line example, the final line's float and double values are all
// infinity. The largest finite float and double values are approximately
// 3.40e+38 and 1.80e+308.
#include <cstdint>
#include <cstdio>
#include <string>
#include "absl/base/casts.h"
#include "absl/strings/numbers.h"
#include "absl/strings/str_format.h"
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
static constexpr uint8_t kUnhex[256] = {
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, // '0' ..= '7'
0x8, 0x9, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, // '8' ..= '9'
0x0, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF, 0x0, // 'A' ..= 'F'
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, //
};
static absl::optional<std::string> ReadFileToString(const char* filename) {
FILE* f = fopen(filename, "rb");
if (!f) {
return absl::nullopt;
}
fseek(f, 0, SEEK_END);
size_t size = ftell(f);
fseek(f, 0, SEEK_SET);
std::string s(size, '\x00');
size_t n = fread(&s[0], 1, size, f);
fclose(f);
if (n != size) {
return absl::nullopt;
}
return s;
}
static bool ProcessOneTestFile(const char* filename) {
absl::optional<std::string> contents = ReadFileToString(filename);
if (!contents) {
absl::FPrintF(stderr, "Invalid file: %s\n", filename);
return false;
}
int num_cases = 0;
for (absl::string_view v(*contents); !v.empty();) {
size_t new_line = v.find('\n');
if ((new_line == absl::string_view::npos) || (new_line < 32)) {
break;
}
absl::string_view input = v.substr(31, new_line - 31);
// Test absl::SimpleAtof.
{
float f;
if (!absl::SimpleAtof(input, &f)) {
absl::FPrintF(stderr, "Could not parse \"%s\" in %s\n", input,
filename);
return false;
}
uint32_t have32 = absl::bit_cast<uint32_t>(f);
uint32_t want32 = 0;
for (int i = 0; i < 8; i++) {
want32 = (want32 << 4) | kUnhex[static_cast<unsigned char>(v[5 + i])];
}
if (have32 != want32) {
absl::FPrintF(stderr,
"absl::SimpleAtof failed parsing \"%s\" in %s\n have "
"%08X\n want %08X\n",
input, filename, have32, want32);
return false;
}
}
// Test absl::SimpleAtod.
{
double d;
if (!absl::SimpleAtod(input, &d)) {
absl::FPrintF(stderr, "Could not parse \"%s\" in %s\n", input,
filename);
return false;
}
uint64_t have64 = absl::bit_cast<uint64_t>(d);
uint64_t want64 = 0;
for (int i = 0; i < 16; i++) {
want64 = (want64 << 4) | kUnhex[static_cast<unsigned char>(v[14 + i])];
}
if (have64 != want64) {
absl::FPrintF(stderr,
"absl::SimpleAtod failed parsing \"%s\" in %s\n have "
"%016X\n want %016X\n",
input, filename, have64, want64);
return false;
}
}
num_cases++;
v = v.substr(new_line + 1);
}
printf("%8d OK in %s\n", num_cases, filename);
return true;
}
int main(int argc, char** argv) {
if (argc < 2) {
absl::FPrintF(
stderr,
"Usage: %s pnftd/data/*.txt\nwhere the pnftd directory is a local "
"checkout of "
"the\nhttps://github.com/nigeltao/parse-number-fxx-test-data "
"repository.\n",
argv[0]);
return 1;
}
for (int i = 1; i < argc; i++) {
if (!ProcessOneTestFile(argv[i])) {
return 1;
}
}
return 0;
}
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