sandboxed-api/sandboxed_api/util/strerror.cc
Wiktor Garbacz a986278550 Raw logging should not allocate memory
PiperOrigin-RevId: 374396461
Change-Id: I709103c7834d4803a26a0b292f342a3d629d332c
2021-05-18 05:37:38 -07:00

68 lines
2.1 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/util/strerror.h"
#include <string.h> // For strerror_r
#include <cerrno>
#include <cstddef>
#include "absl/base/attributes.h"
#include "absl/strings/str_format.h"
namespace sapi {
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
const char* RawStrError(int errnum, char* buf, size_t buflen) {
const int saved_errno = errno;
const char* str = StrErrorR(strerror_r, errnum, buf, buflen);
if (*str == '\0') {
absl::SNPrintF(buf, buflen, "Unknown error %d", errnum);
str = buf;
}
errno = saved_errno;
return str;
}
std::string StrError(int errnum) {
char buf[100];
return RawStrError(errnum, buf, sizeof(buf));
}
} // namespace sapi