Rename util/ to libutil/

libutil/concat.c

@@ -0,0 +1,20 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdio.h>
+#include <unistd.h>
+
+#include "../text.h"
+#include "../util.h"
+
+void
+concat(FILE *fp1, const char *s1, FILE *fp2, const char *s2)
+{
+	char buf[BUFSIZ];
+	ssize_t n;
+
+	while ((n = read(fileno(fp1), buf, sizeof buf)) > 0) {
+		if (write(fileno(fp2), buf, n) != n)
+			eprintf("%s: write error:", s2);
+	}
+	if (n < 0)
+		eprintf("%s: read error:", s1);
+}