/// Test if the given string is a valid variable name.
///
/// \return null if this is a valid name, and a pointer to the first invalid character otherwise.
const wchar_t *wcsvarname(const wchar_t *str) {
while (*str) {
if ((!fish_iswalnum(*str)) && (*str != L'_')) {
return str;
}
str++;
}
return NULL;
}
/// Test if the given string is valid in a variable name.
///
/// \return true if this is a valid name, false otherwise.
bool wcsvarchr(wchar_t chr) { return fish_iswalnum(chr) || chr == L'_'; }
