initial check-in, version 0.5.0v0.5.0

1 files changed, 21 insertions, 0 deletions

diff --git a/src/string/memset.c b/src/string/memset.c
new file mode 100644
index 00000000..20e47c45
--- /dev/null
+++ b/src/string/memset.c
@@ -0,0 +1,21 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <limits.h>
+
+#define SS (sizeof(size_t))
+#define ALIGN (sizeof(size_t)-1)
+#define ONES ((size_t)-1/UCHAR_MAX)
+
+void *memset(void *dest, int c, size_t n)
+{
+	unsigned char *s = dest;
+	c = (unsigned char)c;
+	for (; ((uintptr_t)s & ALIGN) && n; n--) *s++ = c;
+	if (n) {
+		size_t *w, k = ONES * c;
+		for (w = (void *)s; n>=SS; n-=SS, w++) *w = k;
+		for (s = (void *)w; n; n--, s++) *s = c;
+	}
+	return dest;
+}