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merge(3p/absl): subtree merge of Abseil up to e19260f

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... notably, this includes Abseil's own StatusOr type, which
conflicted with our implementation (that was taken from TensorFlow).

Change-Id: Ie7d6764b64055caaeb8dc7b6b9d066291e6b538f
This commit is contained in:
Vincent Ambo 2020-11-21 14:43:54 +01:00
parent cc27324d02
commit 082c006c04
854 changed files with 11260 additions and 5296 deletions
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37
third_party/abseil_cpp/absl/base/internal/strerror.cc vendored
View file

@ -14,6 +14,7 @@
#include "absl/base/internal/strerror.h"
#include <array>
#include <cerrno>
#include <cstddef>
#include <cstdio>
@ -21,13 +22,13 @@
#include <string>
#include <type_traits>
#include "absl/base/attributes.h"
#include "absl/base/internal/errno_saver.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
namespace {
const char* StrErrorAdaptor(int errnum, char* buf, size_t buflen) {
#if defined(_WIN32)
int rc = strerror_s(buf, buflen, errnum);
@ -35,15 +36,6 @@ const char* StrErrorAdaptor(int errnum, char* buf, size_t buflen) {
if (rc == 0 && strncmp(buf, "Unknown error", buflen) == 0) *buf = '\0';
return buf;
#else
#if defined(__GLIBC__) || defined(__APPLE__)
// Use the BSD sys_errlist API provided by GNU glibc and others to
// avoid any need to copy the message into the local buffer first.
if (0 <= errnum && errnum < sys_nerr) {
if (const char* p = sys_errlist[errnum]) {
return p;
}
}
#endif
// The type of `ret` is platform-specific; both of these branches must compile
// either way but only one will execute on any given platform:
auto ret = strerror_r(errnum, buf, buflen);
@ -57,9 +49,8 @@ const char* StrErrorAdaptor(int errnum, char* buf, size_t buflen) {
}
#endif
}
} // namespace
std::string StrError(int errnum) {
std::string StrErrorInternal(int errnum) {
absl::base_internal::ErrnoSaver errno_saver;
char buf[100];
const char* str = StrErrorAdaptor(errnum, buf, sizeof buf);
@ -70,6 +61,28 @@ std::string StrError(int errnum) {
return str;
}
// kSysNerr is the number of errors from a recent glibc. `StrError()` falls back
// to `StrErrorAdaptor()` if the value is larger than this.
constexpr int kSysNerr = 135;
std::array<std::string, kSysNerr>* NewStrErrorTable() {
auto* table = new std::array<std::string, kSysNerr>;
for (int i = 0; i < static_cast<int>(table->size()); ++i) {
(*table)[i] = StrErrorInternal(i);
}
return table;
}
} // namespace
std::string StrError(int errnum) {
static const auto* table = NewStrErrorTable();
if (errnum >= 0 && errnum < static_cast<int>(table->size())) {
return (*table)[errnum];
}
return StrErrorInternal(errnum);
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl