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/*
* Copyright 2018 Google
*
* 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.
*/
// Implementation note:
//
// This is ported from //base/strerror.cc, with several local modifications:
//
// * Removed non-portable optimization around to use sys_errlist where
// available without warnings.
// * Added __attribute__((unused)) to compile with -Wno-unused-functions.
// * Conformed to style/lint rules.
#include "Firestore/core/src/firebase/firestore/util/strerror.h"
#include <cerrno>
#include <cstring>
#if defined(_WIN32)
#define HAVE_STRERROR_S 1
#elif defined(__GLIBC__)
#if (_POSIX_C_SOURCE >= 200112L) && !_GNU_SOURCE
#define HAVE_POSIX_STRERROR_R 1
#else
#define HAVE_GNU_STRERROR_R 1
#endif
#else
#define HAVE_POSIX_STRERROR_R 1
#endif
namespace firebase {
namespace firestore {
namespace util {
namespace {
inline const char* StrErrorAdaptor(int errnum, char* buf, size_t buflen) {
#if HAVE_STRERROR_S
int rc = strerror_s(buf, buflen, errnum);
buf[buflen - 1] = '\0'; // guarantee NUL termination
if (rc == 0 && strcmp(buf, "Unknown error") == 0) {
*buf = '\0';
}
return buf;
#elif HAVE_POSIX_STRERROR_R
if (strerror_r(errnum, buf, buflen)) {
*buf = '\0';
}
return buf;
#elif HAVE_GNU_STRERROR_R
return strerror_r(errnum, buf, buflen);
#endif // HAVE_STRERROR_S
}
} // namespace
std::string StrError(int errnum) {
const int saved_errno = errno;
char buf[100];
const char* str = StrErrorAdaptor(errnum, buf, sizeof buf);
if (*str == '\0') {
snprintf(buf, sizeof buf, "Unknown error %d", errnum);
str = buf;
}
errno = saved_errno;
return str;
}
} // namespace util
} // namespace firestore
} // namespace firebase
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