/*
      Code for manipulating files.
*/
#include <petscsys.h>
#if defined(PETSC_HAVE_WINDOWS_H)
#include <windows.h>
#endif

#if defined(PETSC_HAVE_GET_USER_NAME)
PetscErrorCode PetscGetUserName(char name[], size_t nlen) {
  PetscFunctionBegin;
  GetUserName((LPTSTR)name, (LPDWORD)(&nlen));
  PetscFunctionReturn(0);
}

#else
/*@C
    PetscGetUserName - Returns the name of the user.

    Not Collective

    Input Parameter:
    nlen - length of name

    Output Parameter:
.   name - contains user name.  Must be long enough to hold the name

    Level: developer

.seealso: `PetscGetHostName()`
@*/
PetscErrorCode PetscGetUserName(char name[], size_t nlen) {
  const char *user;

  PetscFunctionBegin;
  user = getenv("USER");
  if (!user) user = "Unknown";
  PetscCall(PetscStrncpy(name, user, nlen));
  PetscFunctionReturn(0);
}
#endif