--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dep/fmt/test/scan-test.cc	Thu Jun 20 05:56:06 2024 -0400
@@ -0,0 +1,188 @@
+// Formatting library for C++ - scanning API test
+//
+// Copyright (c) 2019 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#include "scan.h"
+
+#include <time.h>
+
+#include <climits>
+#include <thread>
+
+#include "fmt/os.h"
+#include "gmock/gmock.h"
+#include "gtest-extra.h"
+
+TEST(scan_test, read_text) {
+  fmt::string_view s = "foo";
+  auto end = fmt::scan(s, "foo");
+  EXPECT_EQ(end, s.end());
+  EXPECT_THROW_MSG(fmt::scan("fob", "foo"), fmt::format_error, "invalid input");
+}
+
+TEST(scan_test, read_int) {
+  int n = 0;
+  fmt::scan("42", "{}", n);
+  EXPECT_EQ(n, 42);
+  fmt::scan("-42", "{}", n);
+  EXPECT_EQ(n, -42);
+  fmt::scan("42", "{:}", n);
+  EXPECT_EQ(n, 42);
+  EXPECT_THROW_MSG(fmt::scan(std::to_string(INT_MAX + 1u), "{}", n),
+                   fmt::format_error, "number is too big");
+}
+
+TEST(scan_test, read_longlong) {
+  long long n = 0;
+  fmt::scan("42", "{}", n);
+  EXPECT_EQ(n, 42);
+  fmt::scan("-42", "{}", n);
+  EXPECT_EQ(n, -42);
+}
+
+TEST(scan_test, read_uint) {
+  unsigned n = 0;
+  fmt::scan("42", "{}", n);
+  EXPECT_EQ(n, 42);
+  EXPECT_THROW_MSG(fmt::scan("-42", "{}", n), fmt::format_error,
+                   "invalid input");
+}
+
+TEST(scan_test, read_ulonglong) {
+  unsigned long long n = 0;
+  fmt::scan("42", "{}", n);
+  EXPECT_EQ(n, 42);
+  EXPECT_THROW_MSG(fmt::scan("-42", "{}", n), fmt::format_error,
+                   "invalid input");
+}
+
+TEST(scan_test, read_hex) {
+  unsigned n = 0;
+  fmt::scan("2a", "{:x}", n);
+  EXPECT_EQ(n, 42);
+  auto num_digits = std::numeric_limits<unsigned>::digits / 4;
+  EXPECT_THROW_MSG(fmt::scan(fmt::format("1{:0{}}", 0, num_digits), "{:x}", n),
+                   fmt::format_error, "number is too big");
+}
+
+TEST(scan_test, read_string) {
+  std::string s;
+  fmt::scan("foo", "{}", s);
+  EXPECT_EQ(s, "foo");
+}
+
+TEST(scan_test, read_string_view) {
+  fmt::string_view s;
+  fmt::scan("foo", "{}", s);
+  EXPECT_EQ(s, "foo");
+}
+
+TEST(scan_test, separator) {
+  int n1 = 0, n2 = 0;
+  fmt::scan("10 20", "{} {}", n1, n2);
+  EXPECT_EQ(n1, 10);
+  EXPECT_EQ(n2, 20);
+}
+
+struct num {
+  int value;
+};
+
+namespace fmt {
+template <> struct scanner<num> {
+  bool hex = false;
+
+  auto parse(scan_parse_context& ctx) -> scan_parse_context::iterator {
+    auto it = ctx.begin(), end = ctx.end();
+    if (it != end && *it == 'x') hex = true;
+    if (it != end && *it != '}') throw_format_error("invalid format");
+    return it;
+  }
+
+  template <class ScanContext>
+  auto scan(num& n, ScanContext& ctx) const -> typename ScanContext::iterator {
+    // TODO: handle specifier
+    return fmt::scan(ctx, "{}", n.value);
+  }
+};
+}  // namespace fmt
+
+TEST(scan_test, read_custom) {
+  auto input = "42";
+  auto n = num();
+  fmt::scan(input, "{:}", n);
+  EXPECT_EQ(n.value, 42);
+}
+
+TEST(scan_test, invalid_format) {
+  EXPECT_THROW_MSG(fmt::scan("", "{}"), fmt::format_error,
+                   "argument index out of range");
+  EXPECT_THROW_MSG(fmt::scan("", "{"), fmt::format_error,
+                   "invalid format string");
+}
+
+TEST(scan_test, example) {
+  std::string key;
+  int value = 0;
+  fmt::scan("answer = 42", "{} = {}", key, value);
+  EXPECT_EQ(key, "answer");
+  EXPECT_EQ(value, 42);
+}
+
+TEST(scan_test, end_of_input) {
+  int value = 0;
+  fmt::scan("", "{}", value);
+}
+
+#if FMT_USE_FCNTL
+TEST(scan_test, file) {
+  fmt::file read_end, write_end;
+  fmt::file::pipe(read_end, write_end);
+
+  fmt::string_view input = "10 20";
+  write_end.write(input.data(), input.size());
+  write_end.close();
+
+  int n1 = 0, n2 = 0;
+  fmt::buffered_file f = read_end.fdopen("r");
+  fmt::scan(f.get(), "{} {}", n1, n2);
+  EXPECT_EQ(n1, 10);
+  EXPECT_EQ(n2, 20);
+}
+
+TEST(scan_test, lock) {
+  fmt::file read_end, write_end;
+  fmt::file::pipe(read_end, write_end);
+
+  std::thread producer([&]() {
+    fmt::string_view input = "42 ";
+    for (int i = 0; i < 1000; ++i) write_end.write(input.data(), input.size());
+    write_end.close();
+  });
+
+  std::atomic<int> count(0);
+  fmt::buffered_file f = read_end.fdopen("r");
+  auto fun = [&]() {
+    int value = 0;
+    while (fmt::scan(f.get(), "{}", value)) {
+      if (value != 42) {
+        read_end.close();
+        EXPECT_EQ(value, 42);
+        break;
+      }
+      ++count;
+    }
+  };
+  std::thread consumer1(fun);
+  std::thread consumer2(fun);
+  
+  producer.join();
+  consumer1.join();
+  consumer2.join();
+  EXPECT_EQ(count, 1000);
+
+}
+#endif  // FMT_USE_FCNTL