Replace strcat with strlcat

src/util/strlcat.h

@@ -0,0 +1,16 @@
+#ifndef STRLCAT_H
+#define STRLCAT_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+/*
+ * Appends src to string dst of size siz (unlike strncat, siz is the
+ * full size of dst, not space left).  At most siz-1 characters
+ * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
+ * Returns strlen(src) + MIN(siz, strlen(initial dst)).
+ * If retval >= siz, truncation occurred.
+ */
+size_t strlcat(char *dst, const char *src, size_t siz);
+
+#endif