iswalnum
int iswalnum(wint_t);
if (iswalnum(c)
#define ISWORD(c) (iswalnum((uch)(c)) || (c) == '_')
return iswalnum(p) || wcschr(el->el_map.wordchars, p) != NULL;
if (iswalnum(p) || wcschr(el->el_map.wordchars, p) != NULL)
ATF_REQUIRE_EQ(!!iswalnum(wc), inout);
#define iswword(x) (iswalnum((x)) || (x) == L'_')