1  // Copyright (c) 2020-present The Bitcoin Core developers
 2  // Distributed under the MIT software license, see the accompanying
 3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 4  
 5  #include <bitcoin-build-config.h> // IWYU pragma: keep
 6  
 7  #include <tinyformat.h>
 8  #include <util/syserror.h>
 9  
10  #include <cstring>
11  #include <string>
12  
13  #if defined(WIN32)
14  #include <windows.h>
15  #endif
16  
17  std::string SysErrorString(int err)
18  {
19      char buf[1024];
20      /* Too bad there are three incompatible implementations of the
21       * thread-safe strerror. */
22      const char *s = nullptr;
23  #ifdef WIN32
24      if (strerror_s(buf, sizeof(buf), err) == 0) s = buf;
25  #else
26  #ifdef STRERROR_R_CHAR_P /* GNU variant can return a pointer outside the passed buffer */
27      s = strerror_r(err, buf, sizeof(buf));
28  #else /* POSIX variant always returns message in buffer */
29      if (strerror_r(err, buf, sizeof(buf)) == 0) s = buf;
30  #endif
31  #endif
32      if (s != nullptr) {
33          return strprintf("%s (%d)", s, err);
34      } else {
35          return strprintf("Unknown error (%d)", err);
36      }
37  }
38  
39  #if defined(WIN32)
40  std::string Win32ErrorString(int err)
41  {
42      char buf[256];
43      buf[0] = 0;
44      if (FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK,
45                         nullptr, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
46                         buf, ARRAYSIZE(buf), nullptr)) {
47          return strprintf("%s (%d)", buf, err);
48      } else {
49          return strprintf("Unknown error (%d)", err);
50      }
51  }
52  #endif