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/*
RCC-Project
Copyright (C) 2026 Richard Qin
This file is part of RCC-Project.
RCC-Project is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your option) any
later version.
RCC-Project is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
RCC-Project; see the file COPYING. If not see
<http://www.gnu.org/licenses/>.
*/
// This implementation is based on llvm/lib/Support/Errno.cpp.
#include "rcc/Support/Errno.h"
#include "rcc/Config/config.h"
#include <cstring>
#include <errno.h>
namespace rcc
{
namespace sys
{
std::string
StrError ()
{
return StrError (errno);
}
std::string
StrError (int errnum)
{
std::string str;
if (errnum == 0)
{
return str;
}
#if defined(HAVE_STRERROR_R) || HAVE_DECL_STRERROR_S
const int maxErrStrLen = 2000;
char buffer[maxErrStrLen];
buffer[0] = '\0';
#endif
#ifdef HAVE_STRERROR_R
// strerror_r is thread-safe.
#if defined(__GLIBC__) && defined(_GNU_SOURCE)
// glibc defines its own incompatible version of strerror_r which may not
// use the buffer supplied.
str = strerror_r (errnum, buffer, maxErrStrLen - 1);
#else
strerror_r (errnum, buffer, maxErrStrLen - 1);
str = buffer;
#endif
#elif HAVE_DECL_STRERROR_S
// Windows Secure API.
strerror_s (buffer, maxErrStrLen - 1, errnum);
str = buffer;
#else
// Copy the thread-unsafe result of strerror into the buffer as fast as
// possible to minimize the impact of collisions in multiple threads.
str = strerror (errnum);
#endif
return str;
}
} // namespace sys
} // namespace rcc
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