sandboxed-api/sandboxed_api/sandbox2/util/strerror.cc
Christian Blichmann 441201884a Update license header with recommended best practices
PiperOrigin-RevId: 290250533
Change-Id: Ic34b253446463cf971a055b70a242df93a598ee3
2020-01-17 05:05:29 -08:00

63 lines
2.0 KiB
C++

// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "sandboxed_api/sandbox2/util/strerror.h"
#include <string.h> // For strerror_r
#include <cerrno>
#include <cstddef>
#include "absl/base/attributes.h"
#include "absl/strings/str_cat.h"
namespace sandbox2 {
namespace {
// Only one of these overloads will be used in any given build, as determined by
// the return type of strerror_r(): char* (for GNU), or int (for XSI). See 'man
// strerror_r' for more details.
ABSL_ATTRIBUTE_UNUSED const char* StrErrorR(char* (*strerror_r)(int, char*,
size_t),
int errnum, char* buf,
size_t buflen) {
return strerror_r(errnum, buf, buflen);
}
// The XSI version (most portable).
ABSL_ATTRIBUTE_UNUSED const char* StrErrorR(int (*strerror_r)(int, char*,
size_t),
int errnum, char* buf,
size_t buflen) {
if (strerror_r(errnum, buf, buflen)) {
*buf = '\0';
}
return buf;
}
} // namespace
std::string StrError(int errnum) {
const int saved_errno = errno;
char buf[100];
const char* str = StrErrorR(strerror_r, errnum, buf, sizeof(buf));
if (*str == '\0') {
return absl::StrCat("Unknown error ", errnum);
}
errno = saved_errno;
return str;
}
} // namespace sandbox2