/* Character classification. */
extern const unsigned short _sch_istable[256];
-#define _sch_test(c, bit) (_sch_istable[(c) & 0xff] & (unsigned char)(bit))
+#define _sch_test(c, bit) (_sch_istable[(c) & 0xff] & (unsigned short)(bit))
#define ISALPHA(c) _sch_test(c, _sch_isalpha)
#define ISALNUM(c) _sch_test(c, _sch_isalnum)