Coverage Report

Created: 2019-07-24 05:18

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/lib/Support/Errno.cpp
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//===- Errno.cpp - errno support --------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the errno wrappers.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Errno.h"
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#include "llvm/Config/config.h"
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#include "llvm/Support/raw_ostream.h"
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#include <string.h>
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only TRULY operating system
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//===          independent code.
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//===----------------------------------------------------------------------===//
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namespace llvm {
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namespace sys {
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#if HAVE_ERRNO_H
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std::string StrError() {
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  return StrError(errno);
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}
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#endif  // HAVE_ERRNO_H
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std::string StrError(int errnum) {
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  std::string str;
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  if (errnum == 0)
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    return str;
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#if defined(HAVE_STRERROR_R) || HAVE_DECL_STRERROR_S
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  const int MaxErrStrLen = 2000;
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  char buffer[MaxErrStrLen];
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  buffer[0] = '\0';
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#endif
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#ifdef HAVE_STRERROR_R
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  // strerror_r is thread-safe.
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#if defined(__GLIBC__) && defined(_GNU_SOURCE)
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  // glibc defines its own incompatible version of strerror_r
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  // which may not use the buffer supplied.
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  str = strerror_r(errnum, buffer, MaxErrStrLen - 1);
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#else
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  strerror_r(errnum, buffer, MaxErrStrLen - 1);
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  str = buffer;
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#endif
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#elif HAVE_DECL_STRERROR_S // "Windows Secure API"
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  strerror_s(buffer, MaxErrStrLen - 1, errnum);
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  str = buffer;
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#elif defined(HAVE_STRERROR)
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  // Copy the thread un-safe result of strerror into
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  // the buffer as fast as possible to minimize impact
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  // of collision of strerror in multiple threads.
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  str = strerror(errnum);
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#else
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  // Strange that this system doesn't even have strerror
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  // but, oh well, just use a generic message
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  raw_string_ostream stream(str);
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  stream << "Error #" << errnum;
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  stream.flush();
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#endif
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  return str;
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}
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}  // namespace sys
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}  // namespace llvm