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[libc] Add memset()

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -2,7 +2,8 @@

 .POSIX:

 LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o strchr.o \

-          strrchr.o strcat.o strncpy.o strncat.o

+          strrchr.o strcat.o strncpy.o strncat.o \

+          memset.o

 all: libc.a

--- /dev/null

+++ b/libc/src/memset.c

@@ -1,0 +1,13 @@

+/* See LICENSE file for copyright and license details. */

+

+#include <string.h>

+

+void *

+memset(void *s, int c, size_t n)

+{

+	char *bp;

+

+	for (bp = s; n-- > 0; *bp++ = c)

+		/* nothing */;

+	return s;

+}