chromium/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_base/posix/safe_strerror.cc

// Copyright 2006-2009 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "partition_alloc/partition_alloc_base/posix/safe_strerror.h"

#include <cerrno>
#include <cstdio>
#include <cstring>

#include "partition_alloc/build_config.h"

namespace partition_alloc::internal::base {

#if defined(__GLIBC__)
#define USE_HISTORICAL_STRERROR_R …
// Post-L versions of bionic define the GNU-specific strerror_r if _GNU_SOURCE
// is defined, but the symbol is renamed to __gnu_strerror_r which only exists
// on those later versions. For parity, add the same condition as bionic.
#elif defined(__BIONIC__) && defined(_GNU_SOURCE) && __ANDROID_API__ >= 23
#define USE_HISTORICAL_STRERROR_R …
#else
#define USE_HISTORICAL_STRERROR_R …
#endif

#if USE_HISTORICAL_STRERROR_R
// glibc has two strerror_r functions: a historical GNU-specific one that
// returns type char *, and a POSIX.1-2001 compliant one available since 2.3.4
// that returns int. This wraps the GNU-specific one.
[[maybe_unused]] static void wrap_posix_strerror_r(
    char* (*strerror_r_ptr)(int, char*, size_t),
    int err,
    char* buf,
    size_t len) { … }
#endif  // USE_HISTORICAL_STRERROR_R

// Wrapper for strerror_r functions that implement the POSIX interface. POSIX
// does not define the behaviour for some of the edge cases, so we wrap it to
// guarantee that they are handled. This is compiled on all POSIX platforms, but
// it will only be used on Linux if the POSIX strerror_r implementation is
// being used (see below).
[[maybe_unused]] static void wrap_posix_strerror_r(
    int (*strerror_r_ptr)(int, char*, size_t),
    int err,
    char* buf,
    size_t len) { … }

void safe_strerror_r(int err, char* buf, size_t len) { … }

std::string safe_strerror(int err) { … }

}  // namespace partition_alloc::internal::base