diff --git a/tests/Makefile.am b/tests/Makefile.am
index 3005382..add44ef 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -46,6 +46,7 @@
 	hexdump_strdup.c \
 	hexquote_strndup.c \
 	inode_of_sockfd.c \
+	print_quoted_string.c \
 	tail_alloc.c \
 	tests.h \
 	tprintf.c \
diff --git a/tests/print_quoted_string.c b/tests/print_quoted_string.c
new file mode 100644
index 0000000..18a9ccf
--- /dev/null
+++ b/tests/print_quoted_string.c
@@ -0,0 +1,67 @@
+#include "tests.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+/*
+ * Based on string_quote() from util.c.
+ * Assumes instr is NUL-terminated.
+ */
+
+void
+print_quoted_string(const char *instr)
+{
+	const unsigned char *str = (const unsigned char*) instr;
+	int c;
+
+	while ((c = *(str++))) {
+		switch (c) {
+			case '\"':
+				printf("\\\"");
+				break;
+			case '\\':
+				printf("\\\\");
+				break;
+			case '\f':
+				printf("\\f");
+				break;
+			case '\n':
+				printf("\\n");
+				break;
+			case '\r':
+				printf("\\r");
+				break;
+			case '\t':
+				printf("\\t");
+				break;
+			case '\v':
+				printf("\\v");
+				break;
+			default:
+				if (c >= ' ' && c <= 0x7e)
+					putchar(c);
+				else {
+					putchar('\\');
+
+					char c1 = '0' + (c & 0x7);
+					char c2 = '0' + ((c >> 3) & 0x7);
+					char c3 = '0' + (c >> 6);
+
+					if (*str >= '0' && *str <= '9') {
+						/* Print \octal */
+						putchar(c3);
+						putchar(c2);
+					} else {
+						/* Print \[[o]o]o */
+						if (c3 != '0')
+							putchar(c3);
+						if (c3 != '0' || c2 != '0')
+							putchar(c2);
+					}
+					putchar(c1);
+				}
+				break;
+		}
+	}
+
+}
diff --git a/tests/tests.h b/tests/tests.h
index 826f8b2..d8632ba 100644
--- a/tests/tests.h
+++ b/tests/tests.h
@@ -75,6 +75,9 @@
 /* Return inode number of socket descriptor. */
 unsigned long inode_of_sockfd(int);
 
+/* Print string in quoted form. */
+void print_quoted_string(const char *str);
+
 # define ARRAY_SIZE(arg) ((unsigned int) (sizeof(arg) / sizeof((arg)[0])))
 # define LENGTH_OF(arg) ((unsigned int) sizeof(arg) - 1)