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[libc] Add supports for strxfrm()

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -3,6 +3,7 @@

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

           strrchr.o strcat.o strncpy.o strncat.o strcoll.o \

+          strxfrm.o \

           memset.o memcpy.o memmove.o memcmp.o memchr.o \

           isalnum.o isalpha.o isascii.o isblank.o iscntrl.o isdigit.o \

           isgraph.o islower.o isprint.o ispunct.o isspace.o isupper.o \

--- /dev/null

+++ b/libc/src/strxfrm.c

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

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

+

+#include <string.h>

+

+size_t

+strxfrm(char *dst, const char *src, size_t n)

+{

+	size_t len = strlen(src);

+

+	if (len < n)

+		strcpy(dst, src);

+	return len;

+}