/* copy_absolute requires that path be allocated at least
MAXPATHLEN + 1 bytes and that p be no more than MAXPATHLEN bytes. */
static void
copy_absolute(wchar_t *path, wchar_t *p, size_t pathlen)
{
if (p[0] == SEP)
wcscpy(path, p);
else {
if (!_Py_wgetcwd(path, pathlen)) {
/* unable to get the current directory */
wcscpy(path, p);
return;
}
if (p[0] == '.' && p[1] == SEP)
p += 2;
joinpath(path, p);
}
}
/* Compute argv[0] which will be prepended to sys.argv */
PyObject*
_PyPathConfig_ComputeArgv0(int argc, wchar_t **argv)
{
wchar_t *argv0;
wchar_t *p = NULL;
Py_ssize_t n = 0;
int have_script_arg = 0;
int have_module_arg = 0;
#ifdef HAVE_READLINK
wchar_t link[MAXPATHLEN+1];
wchar_t argv0copy[2*MAXPATHLEN+1];
int nr = 0;
#endif
#if defined(HAVE_REALPATH)
wchar_t fullpath[MAXPATHLEN];
#elif defined(MS_WINDOWS)
wchar_t fullpath[MAX_PATH];
#endif
argv0 = argv[0];
if (argc > 0 && argv0 != NULL) {
have_module_arg = (wcscmp(argv0, L"-m") == 0);
have_script_arg = !have_module_arg && (wcscmp(argv0, L"-c") != 0);
}
if (have_module_arg) {
#if defined(HAVE_REALPATH) || defined(MS_WINDOWS)
_Py_wgetcwd(fullpath, Py_ARRAY_LENGTH(fullpath));
argv0 = fullpath;
n = wcslen(argv0);
#else
argv0 = L".";
n = 1;
#endif
}
#ifdef HAVE_READLINK
if (have_script_arg)
nr = _Py_wreadlink(argv0, link, MAXPATHLEN);
if (nr > 0) {
/* It's a symlink */
link[nr] = '\0';
if (link[0] == SEP)
argv0 = link; /* Link to absolute path */
else if (wcschr(link, SEP) == NULL)
; /* Link without path */
else {
/* Must join(dirname(argv0), link) */
wchar_t *q = wcsrchr(argv0, SEP);
if (q == NULL)
argv0 = link; /* argv0 without path */
else {
/* Must make a copy, argv0copy has room for 2 * MAXPATHLEN */
wcsncpy(argv0copy, argv0, MAXPATHLEN);
q = wcsrchr(argv0copy, SEP);
wcsncpy(q+1, link, MAXPATHLEN);
q[MAXPATHLEN + 1] = L'\0';
argv0 = argv0copy;
}
}
}
#endif /* HAVE_READLINK */
#if SEP == '\\'
/* Special case for Microsoft filename syntax */
if (have_script_arg) {
wchar_t *q;
#if defined(MS_WINDOWS)
/* Replace the first element in argv with the full path. */
wchar_t *ptemp;
if (GetFullPathNameW(argv0,
Py_ARRAY_LENGTH(fullpath),
fullpath,
&ptemp)) {
argv0 = fullpath;
}
#endif
p = wcsrchr(argv0, SEP);
/* Test for alternate separator */
q = wcsrchr(p ? p : argv0, '/');
if (q != NULL)
p = q;
if (p != NULL) {
n = p + 1 - argv0;
if (n > 1 && p[-1] != ':')
n--; /* Drop trailing separator */
}
}
#else /* All other filename syntaxes */
if (have_script_arg) {
#if defined(HAVE_REALPATH)
if (_Py_wrealpath(argv0, fullpath, Py_ARRAY_LENGTH(fullpath))) {
argv0 = fullpath;
}
#endif
p = wcsrchr(argv0, SEP);
}
if (p != NULL) {
n = p + 1 - argv0;
#if SEP == '/' /* Special case for Unix filename syntax */
if (n > 1)
n--; /* Drop trailing separator */
#endif /* Unix */
}
#endif /* All others */
return PyUnicode_FromWideChar(argv0, n);
}
