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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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