S_ISREG macro undefined

Question

Questions

• Are the posix macros S_ISREG, S_ISDIR etc linux only? I need to find out because i am trying to compile CURL and it is trying to use them on windows
• Wh

Answer 1

After having inspected Microsoft's sys/stat.h, I found that the following modification of @OliverZendel's answer worked for me, with Visual Studio 2017, and hopefully on other compilers as well:

// Windows does not define the S_ISREG and S_ISDIR macros in stat.h, so we do.
// We have to define _CRT_INTERNAL_NONSTDC_NAMES 1 before #including sys/stat.h
// in order for Microsoft's stat.h to define names like S_IFMT, S_IFREG, and S_IFDIR,
// rather than just defining  _S_IFMT, _S_IFREG, and _S_IFDIR as it normally does.
#define _CRT_INTERNAL_NONSTDC_NAMES 1
#include 
#if !defined(S_ISREG) && defined(S_IFMT) && defined(S_IFREG)
  #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#endif
#if !defined(S_ISDIR) && defined(S_IFMT) && defined(S_IFDIR)
  #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif