Creation of LTS branch "lts_2018_12_18"

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GitOrigin-RevId: 44b0fafc62d9b8f192e8180cbe9c4b806b339d57
Change-Id: I2c427b5b41b2d34101922048b00f3d9dafcb498d

1 files changed, 379 insertions, 0 deletions

diff --git a/absl/strings/internal/str_format/arg.cc b/absl/strings/internal/str_format/arg.cc
new file mode 100644
index 00000000..e5e1eee5
--- /dev/null
+++ b/absl/strings/internal/str_format/arg.cc
@@ -0,0 +1,379 @@
+//
+// POSIX spec:
+//   http://pubs.opengroup.org/onlinepubs/009695399/functions/fprintf.html
+//
+#include "absl/strings/internal/str_format/arg.h"
+
+#include <cassert>
+#include <cerrno>
+#include <cstdlib>
+#include <string>
+#include <type_traits>
+
+#include "absl/base/port.h"
+#include "absl/strings/internal/str_format/float_conversion.h"
+
+namespace absl {
+inline namespace lts_2018_12_18 {
+namespace str_format_internal {
+namespace {
+
+const char kDigit[2][32] = { "0123456789abcdef", "0123456789ABCDEF" };
+
+// Reduce *capacity by s.size(), clipped to a 0 minimum.
+void ReducePadding(string_view s, size_t *capacity) {
+  *capacity = Excess(s.size(), *capacity);
+}
+
+// Reduce *capacity by n, clipped to a 0 minimum.
+void ReducePadding(size_t n, size_t *capacity) {
+  *capacity = Excess(n, *capacity);
+}
+
+template <typename T>
+struct MakeUnsigned : std::make_unsigned<T> {};
+template <>
+struct MakeUnsigned<absl::uint128> {
+  using type = absl::uint128;
+};
+
+template <typename T>
+struct IsSigned : std::is_signed<T> {};
+template <>
+struct IsSigned<absl::uint128> : std::false_type {};
+
+class ConvertedIntInfo {
+ public:
+  template <typename T>
+  ConvertedIntInfo(T v, ConversionChar conv) {
+    using Unsigned = typename MakeUnsigned<T>::type;
+    auto u = static_cast<Unsigned>(v);
+    if (IsNeg(v)) {
+      is_neg_ = true;
+      u = Unsigned{} - u;
+    } else {
+      is_neg_ = false;
+    }
+    UnsignedToStringRight(u, conv);
+  }
+
+  string_view digits() const {
+    return {end() - size_, static_cast<size_t>(size_)};
+  }
+  bool is_neg() const { return is_neg_; }
+
+ private:
+  template <typename T, bool IsSigned>
+  struct IsNegImpl {
+    static bool Eval(T v) { return v < 0; }
+  };
+  template <typename T>
+  struct IsNegImpl<T, false> {
+    static bool Eval(T) {
+      return false;
+    }
+  };
+
+  template <typename T>
+  bool IsNeg(T v) {
+    return IsNegImpl<T, IsSigned<T>::value>::Eval(v);
+  }
+
+  template <typename T>
+  void UnsignedToStringRight(T u, ConversionChar conv) {
+    char *p = end();
+    switch (conv.radix()) {
+      default:
+      case 10:
+        for (; u; u /= 10)
+          *--p = static_cast<char>('0' + static_cast<size_t>(u % 10));
+        break;
+      case 8:
+        for (; u; u /= 8)
+          *--p = static_cast<char>('0' + static_cast<size_t>(u % 8));
+        break;
+      case 16: {
+        const char *digits = kDigit[conv.upper() ? 1 : 0];
+        for (; u; u /= 16) *--p = digits[static_cast<size_t>(u % 16)];
+        break;
+      }
+    }
+    size_ = static_cast<int>(end() - p);
+  }
+
+  const char *end() const { return storage_ + sizeof(storage_); }
+  char *end() { return storage_ + sizeof(storage_); }
+
+  bool is_neg_;
+  int size_;
+  // Max size: 128 bit value as octal -> 43 digits
+  char storage_[128 / 3 + 1];
+};
+
+// Note: 'o' conversions do not have a base indicator, it's just that
+// the '#' flag is specified to modify the precision for 'o' conversions.
+string_view BaseIndicator(const ConvertedIntInfo &info,
+                          const ConversionSpec conv) {
+  bool alt = conv.flags().alt;
+  int radix = conv.conv().radix();
+  if (conv.conv().id() == ConversionChar::p)
+    alt = true;  // always show 0x for %p.
+  // From the POSIX description of '#' flag:
+  //   "For x or X conversion specifiers, a non-zero result shall have
+  //   0x (or 0X) prefixed to it."
+  if (alt && radix == 16 && !info.digits().empty()) {
+    if (conv.conv().upper()) return "0X";
+    return "0x";
+  }
+  return {};
+}
+
+string_view SignColumn(bool neg, const ConversionSpec conv) {
+  if (conv.conv().is_signed()) {
+    if (neg) return "-";
+    if (conv.flags().show_pos) return "+";
+    if (conv.flags().sign_col) return " ";
+  }
+  return {};
+}
+
+bool ConvertCharImpl(unsigned char v, const ConversionSpec conv,
+                     FormatSinkImpl *sink) {
+  size_t fill = 0;
+  if (conv.width() >= 0) fill = conv.width();
+  ReducePadding(1, &fill);
+  if (!conv.flags().left) sink->Append(fill, ' ');
+  sink->Append(1, v);
+  if (conv.flags().left) sink->Append(fill, ' ');
+  return true;
+}
+
+bool ConvertIntImplInner(const ConvertedIntInfo &info,
+                         const ConversionSpec conv, FormatSinkImpl *sink) {
+  // Print as a sequence of Substrings:
+  //   [left_spaces][sign][base_indicator][zeroes][formatted][right_spaces]
+  size_t fill = 0;
+  if (conv.width() >= 0) fill = conv.width();
+
+  string_view formatted = info.digits();
+  ReducePadding(formatted, &fill);
+
+  string_view sign = SignColumn(info.is_neg(), conv);
+  ReducePadding(sign, &fill);
+
+  string_view base_indicator = BaseIndicator(info, conv);
+  ReducePadding(base_indicator, &fill);
+
+  int precision = conv.precision();
+  bool precision_specified = precision >= 0;
+  if (!precision_specified)
+    precision = 1;
+
+  if (conv.flags().alt && conv.conv().id() == ConversionChar::o) {
+    // From POSIX description of the '#' (alt) flag:
+    //   "For o conversion, it increases the precision (if necessary) to
+    //   force the first digit of the result to be zero."
+    if (formatted.empty() || *formatted.begin() != '0') {
+      int needed = static_cast<int>(formatted.size()) + 1;
+      precision = std::max(precision, needed);
+    }
+  }
+
+  size_t num_zeroes = Excess(formatted.size(), precision);
+  ReducePadding(num_zeroes, &fill);
+
+  size_t num_left_spaces = !conv.flags().left ? fill : 0;
+  size_t num_right_spaces = conv.flags().left ? fill : 0;
+
+  // From POSIX description of the '0' (zero) flag:
+  //   "For d, i, o, u, x, and X conversion specifiers, if a precision
+  //   is specified, the '0' flag is ignored."
+  if (!precision_specified && conv.flags().zero) {
+    num_zeroes += num_left_spaces;
+    num_left_spaces = 0;
+  }
+
+  sink->Append(num_left_spaces, ' ');
+  sink->Append(sign);
+  sink->Append(base_indicator);
+  sink->Append(num_zeroes, '0');
+  sink->Append(formatted);
+  sink->Append(num_right_spaces, ' ');
+  return true;
+}
+
+template <typename T>
+bool ConvertIntImplInner(T v, const ConversionSpec conv, FormatSinkImpl *sink) {
+  ConvertedIntInfo info(v, conv.conv());
+  if (conv.flags().basic && conv.conv().id() != ConversionChar::p) {
+    if (info.is_neg()) sink->Append(1, '-');
+    if (info.digits().empty()) {
+      sink->Append(1, '0');
+    } else {
+      sink->Append(info.digits());
+    }
+    return true;
+  }
+  return ConvertIntImplInner(info, conv, sink);
+}
+
+template <typename T>
+bool ConvertIntArg(T v, const ConversionSpec conv, FormatSinkImpl *sink) {
+  if (conv.conv().is_float()) {
+    return FormatConvertImpl(static_cast<double>(v), conv, sink).value;
+  }
+  if (conv.conv().id() == ConversionChar::c)
+    return ConvertCharImpl(static_cast<unsigned char>(v), conv, sink);
+  if (!conv.conv().is_integral())
+    return false;
+  if (!conv.conv().is_signed() && IsSigned<T>::value) {
+    using U = typename MakeUnsigned<T>::type;
+    return FormatConvertImpl(static_cast<U>(v), conv, sink).value;
+  }
+  return ConvertIntImplInner(v, conv, sink);
+}
+
+template <typename T>
+bool ConvertFloatArg(T v, const ConversionSpec conv, FormatSinkImpl *sink) {
+  return conv.conv().is_float() && ConvertFloatImpl(v, conv, sink);
+}
+
+inline bool ConvertStringArg(string_view v, const ConversionSpec conv,
+                             FormatSinkImpl *sink) {
+  if (conv.conv().id() != ConversionChar::s)
+    return false;
+  if (conv.flags().basic) {
+    sink->Append(v);
+    return true;
+  }
+  return sink->PutPaddedString(v, conv.width(), conv.precision(),
+                               conv.flags().left);
+}
+
+}  // namespace
+
+// ==================== Strings ====================
+ConvertResult<Conv::s> FormatConvertImpl(const std::string &v,
+                                         const ConversionSpec conv,
+                                         FormatSinkImpl *sink) {
+  return {ConvertStringArg(v, conv, sink)};
+}
+
+ConvertResult<Conv::s> FormatConvertImpl(string_view v,
+                                         const ConversionSpec conv,
+                                         FormatSinkImpl *sink) {
+  return {ConvertStringArg(v, conv, sink)};
+}
+
+ConvertResult<Conv::s | Conv::p> FormatConvertImpl(const char *v,
+                                                   const ConversionSpec conv,
+                                                   FormatSinkImpl *sink) {
+  if (conv.conv().id() == ConversionChar::p)
+    return {FormatConvertImpl(VoidPtr(v), conv, sink).value};
+  size_t len;
+  if (v == nullptr) {
+    len = 0;
+  } else if (conv.precision() < 0) {
+    len = std::strlen(v);
+  } else {
+    // If precision is set, we look for the null terminator on the valid range.
+    len = std::find(v, v + conv.precision(), '\0') - v;
+  }
+  return {ConvertStringArg(string_view(v, len), conv, sink)};
+}
+
+// ==================== Raw pointers ====================
+ConvertResult<Conv::p> FormatConvertImpl(VoidPtr v, const ConversionSpec conv,
+                                         FormatSinkImpl *sink) {
+  if (conv.conv().id() != ConversionChar::p)
+    return {false};
+  if (!v.value) {
+    sink->Append("(nil)");
+    return {true};
+  }
+  return {ConvertIntImplInner(v.value, conv, sink)};
+}
+
+// ==================== Floats ====================
+FloatingConvertResult FormatConvertImpl(float v, const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertFloatArg(v, conv, sink)};
+}
+FloatingConvertResult FormatConvertImpl(double v, const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertFloatArg(v, conv, sink)};
+}
+FloatingConvertResult FormatConvertImpl(long double v,
+                                        const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertFloatArg(v, conv, sink)};
+}
+
+// ==================== Chars ====================
+IntegralConvertResult FormatConvertImpl(char v, const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(signed char v,
+                                        const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(unsigned char v,
+                                        const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertIntArg(v, conv, sink)};
+}
+
+// ==================== Ints ====================
+IntegralConvertResult FormatConvertImpl(short v,  // NOLINT
+                                        const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(unsigned short v,  // NOLINT
+                                        const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(int v, const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(unsigned v, const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(long v,  // NOLINT
+                                        const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(unsigned long v,  // NOLINT
+                                        const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(long long v,  // NOLINT
+                                        const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(unsigned long long v,  // NOLINT
+                                        const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertIntArg(v, conv, sink)};
+}
+IntegralConvertResult FormatConvertImpl(absl::uint128 v,
+                                        const ConversionSpec conv,
+                                        FormatSinkImpl *sink) {
+  return {ConvertIntArg(v, conv, sink)};
+}
+
+ABSL_INTERNAL_FORMAT_DISPATCH_OVERLOADS_EXPAND_();
+
+
+}  // namespace str_format_internal
+
+}  // inline namespace lts_2018_12_18
+}  // namespace absl