Export of internal Abseil changes.

--
714347c156cfe01575c1830a92bc6dea3030065b by Emma Christie <emmachristie@google.com>:

Release absl::EqualsIgnoreCase

PiperOrigin-RevId: 216243900

--
688106e2b9d2924799d597682690851cfba87818 by Abseil Team <absl-team@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 216208373

--
53638e4da238b230af0e56dc31b9fb790e708f36 by Emma Christie <emmachristie@google.com>:

Update StartsWithIgnoreCase(), EndsWithIgnoreCase(), and EqualsIgnoreCase() headers to say that these functions only consider ASCII case inputs.

PiperOrigin-RevId: 215930962
GitOrigin-RevId: 714347c156cfe01575c1830a92bc6dea3030065b
Change-Id: I7fb3506234185b1a961e0110c1f8302ffe7228fa

absl/time/internal/cctz/include/cctz/civil_time_detail.h

@@ -416,6 +416,12 @@ class civil_time {
     return difference(T{}, lhs.f_, rhs.f_);
   }
 
+  template <typename H>
+  friend H AbslHashValue(H h, civil_time a) {
+    return H::combine(std::move(h), a.f_.y, a.f_.m, a.f_.d,
+                                    a.f_.hh, a.f_.mm, a.f_.ss);
+  }
+
  private:
   // All instantiations of this template are allowed to call the following
   // private constructor and access the private fields member.

absl/time/internal/cctz/include/cctz/time_zone.h

@@ -224,6 +224,11 @@ class time_zone {
     return !(lhs == rhs);
   }
 
+  template <typename H>
+  friend H AbslHashValue(H h, time_zone tz) {
+    return H::combine(std::move(h), &tz.effective_impl());
+  }
+
   class Impl;
 
  private:

absl/time/internal/cctz/src/civil_time_test.cc

@@ -620,7 +620,7 @@ TEST(CivilTime, Relational) {
   TEST_RELATIONAL(civil_second(2014, 1, 1, 1, 1, 0),
                   civil_second(2014, 1, 1, 1, 1, 1));
 
-  // Tests the relational operators of two different CivilTime types.
+  // Tests the relational operators of two different civil-time types.
   TEST_RELATIONAL(civil_day(2014, 1, 1), civil_minute(2014, 1, 1, 1, 1));
   TEST_RELATIONAL(civil_day(2014, 1, 1), civil_month(2014, 2));
 

absl/time/internal/cctz/src/time_zone_fixed.cc

@@ -15,8 +15,8 @@
 #include "time_zone_fixed.h"
 
 #include <algorithm>
+#include <cassert>
 #include <chrono>
-#include <cstdio>
 #include <cstring>
 #include <string>
 
@@ -29,8 +29,15 @@ namespace {
 // The prefix used for the internal names of fixed-offset zones.
 const char kFixedOffsetPrefix[] = "Fixed/UTC";
 
+const char kDigits[] = "0123456789";
+
+char* Format02d(char* p, int v) {
+  *p++ = kDigits[(v / 10) % 10];
+  *p++ = kDigits[v % 10];
+  return p;
+}
+
 int Parse02d(const char* p) {
-  static const char kDigits[] = "0123456789";
   if (const char* ap = std::strchr(kDigits, *p)) {
     int v = static_cast<int>(ap - kDigits);
     if (const char* bp = std::strchr(kDigits, *++p)) {
@@ -95,9 +102,17 @@ std::string FixedOffsetToName(const seconds& offset) {
   }
   int hours = minutes / 60;
   minutes %= 60;
-  char buf[sizeof(kFixedOffsetPrefix) + sizeof("-24:00:00")];
-  snprintf(buf, sizeof(buf), "%s%c%02d:%02d:%02d",
-           kFixedOffsetPrefix, sign, hours, minutes, seconds);
+  char buf[sizeof(kFixedOffsetPrefix) - 1 + sizeof("-24:00:00")];
+  std::strcpy(buf, kFixedOffsetPrefix);
+  char* ep = buf + sizeof(kFixedOffsetPrefix) - 1;
+  *ep++ = sign;
+  ep = Format02d(ep, hours);
+  *ep++ = ':';
+  ep = Format02d(ep, minutes);
+  *ep++ = ':';
+  ep = Format02d(ep, seconds);
+  *ep++ = '\0';
+  assert(ep == buf + sizeof(buf));
   return buf;
 }