+#endif /* ! defined _LIBC */
+
+
+#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 spaces[16] = /* " " */
+ { ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ' };
+static const char zeroes[16] = /* "0000000000000000" */
+ { '0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0' };
+
+# define memset_space(P, Len) \
+ do { \
+ int _len = (Len); \
+ \
+ do \
+ { \
+ int _this = _len > 16 ? 16 : _len; \
+ (P) = MEMPCPY ((P), spaces, _this); \
+ _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); \
+ _len -= _this; \
+ } \
+ while (_len > 0); \
+ } while (0)
+#else
+# define memset_space(P, Len) (memset ((P), ' ', (Len)), (P) += (Len))
+# define memset_zero(P, Len) (memset ((P), '0', (Len)), (P) += (Len))
+#endif