+#if !defined memset && !defined HAVE_MEMSET && !defined _LIBC
+/* Some systems lack the `memset' function and we don't want to
+ introduce additional dependencies. */
+/* The SGI compiler reportedly barfs on the trailing null
+ if we use a string constant as the initializer. 28 June 1997, rms. */
+static const CHAR_T spaces[16] = /* " " */
+{
+ L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),
+ L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),L_(' '),L_(' ')
+};
+static const CHAR_T zeroes[16] = /* "0000000000000000" */
+{
+ L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),
+ L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),L_('0'),L_('0')
+};
+
+# define memset_space(P, Len) \
+ do { \
+ int _len = (Len); \
+ \
+ do \
+ { \
+ int _this = _len > 16 ? 16 : _len; \
+ (P) = MEMPCPY ((P), spaces, _this * sizeof (CHAR_T)); \
+ _len -= _this; \
+ } \
+ while (_len > 0); \
+ } while (0)
+
+# define memset_zero(P, Len) \
+ do { \
+ int _len = (Len); \
+ \
+ do \
+ { \
+ int _this = _len > 16 ? 16 : _len; \
+ (P) = MEMPCPY ((P), zeroes, _this * sizeof (CHAR_T)); \
+ _len -= _this; \
+ } \
+ while (_len > 0); \
+ } while (0)
+#else
+# ifdef COMPILE_WIDE
+# define memset_space(P, Len) (wmemset ((P), L' ', (Len)), (P) += (Len))
+# define memset_zero(P, Len) (wmemset ((P), L'0', (Len)), (P) += (Len))
+# else
+# define memset_space(P, Len) (memset ((P), ' ', (Len)), (P) += (Len))
+# define memset_zero(P, Len) (memset ((P), '0', (Len)), (P) += (Len))
+# endif
+#endif
+
+#define add(n, f) \