#ifndef PYWIN9X_COMPAT_MSVC600_PATHCCH_H
#define PYWIN9X_COMPAT_MSVC600_PATHCCH_H

/*
 * Narrow PathCchFindExtension compatibility for the VC6/MSVC600 probe.
 *
 * CPython 3.11's Modules/getpath.c includes <pathcch.h> only to call
 * PathCchFindExtension() from getpath_isxfile().  MSVC 6.0's Windows SDK
 * predates PathCch, so provide just that one API shape for the project-local
 * VC6 include path.  Modern builds should keep using the platform SDK header;
 * this file is not installed into CPython or a system include directory.
 */

#if defined(_MSC_VER) && _MSC_VER <= 1200

#ifndef _WINDOWS_
#include <windows.h>
#endif
#include <stddef.h>

#ifndef PCWSTR
typedef const WCHAR *PCWSTR;
#endif
#ifndef PWSTR
typedef WCHAR *PWSTR;
#endif
#ifndef S_OK
#define S_OK ((HRESULT)0L)
#endif
#ifndef E_INVALIDARG
#define E_INVALIDARG ((HRESULT)0x80070057L)
#endif

static HRESULT
PathCchFindExtension(PCWSTR pszPath, size_t cchPath, PCWSTR *ppszExt)
{
    size_t i;
    size_t last_sep;
    size_t last_dot;
    int have_dot;

    if (pszPath == NULL || ppszExt == NULL || cchPath == 0) {
        return E_INVALIDARG;
    }

    last_sep = 0;
    last_dot = 0;
    have_dot = 0;

    for (i = 0; i < cchPath; ++i) {
        WCHAR ch = pszPath[i];
        if (ch == L'\0') {
            if (have_dot) {
                *ppszExt = pszPath + last_dot;
            }
            else {
                *ppszExt = pszPath + i;
            }
            return S_OK;
        }
        if (ch == L'\\' || ch == L'/' || ch == L':') {
            last_sep = i + 1;
            have_dot = 0;
        }
        else if (ch == L'.' && i >= last_sep) {
            last_dot = i;
            have_dot = 1;
        }
    }

    *ppszExt = NULL;
    return E_INVALIDARG;
}

#else
/*
 * This compatibility header is intentionally scoped to VC6.  If a modern
 * compiler finds it, the include path is wrong: use the real Windows SDK
 * pathcch.h instead to avoid shadowing the platform declaration.
 */
#error "compat/msvc600/pathcch.h is only for MSVC 6.0; use the Windows SDK pathcch.h on modern compilers"
#endif

#endif /* PYWIN9X_COMPAT_MSVC600_PATHCCH_H */