D42863.diff
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	diff --git a/lib/libc/amd64/string/Makefile.inc b/lib/libc/amd64/string/Makefile.inc
	--- a/lib/libc/amd64/string/Makefile.inc
	+++ b/lib/libc/amd64/string/Makefile.inc
	@@ -13,6 +13,7 @@
	strcmp.S \
	strcpy.c \
	strcspn.S \
	+ strlcat.c \
	strlcpy.S \
	strlen.S \
	strncmp.S \
	diff --git a/lib/libc/amd64/string/strlcat.c b/lib/libc/amd64/string/strlcat.c
	new file mode 100644
	--- /dev/null
	+++ b/lib/libc/amd64/string/strlcat.c
	@@ -0,0 +1,25 @@
	+/*-
	+ * SPDX-License-Identifier: BSD-2-Clause
	+ *
	+ * Copyright (c) 2023 Robert Clausecker
	+ */
	+
	+#include <sys/cdefs.h>
	+
	+#include <string.h>
	+
	+void __memchr(const void , int, size_t);
	+size_t __strlcpy(char restrict, const char restrict, size_t);
	+
	+size_t
	+strlcat(char restrict dst, const char restrict src, size_t dstsize)
	+{
	+ char *loc = __memchr(dst, '\0', dstsize);
	+
	+ if (loc != NULL) {
	+ size_t dstlen = (size_t)(loc - dst);
	+
	+ return (dstlen + __strlcpy(loc, src, dstsize - dstlen));
	+ } else
	+ return (dstsize + strlen(src));
	+}