--- a/src/idn.c
+++ b/src/idn.c
-@@ -171,7 +171,7 @@ main (int argc, char *argv[])
+@@ -169,7 +169,7 @@ main (int argc, char *argv[])
(args_info.idna_to_unicode_given ? 1 : 0) +
(args_info.nfkc_given ? 1 : 0) != 1)
{
usage (EXIT_FAILURE);
}
-@@ -182,7 +182,7 @@ main (int argc, char *argv[])
- fprintf (stderr, _("Charset `%s'.\n"), stringprep_locale_charset ());
-
- if (!args_info.quiet_given && args_info.inputs_num == 0)
+@@ -184,7 +184,7 @@ main (int argc, char *argv[])
+ if (!args_info.quiet_given
+ && args_info.inputs_num == 0
+ && isatty (fileno (stdin)))
- fprintf (stderr, _("Type each input string on a line by itself, "
+ fprintf (stderr, "%s", _("Type each input string on a line by itself, "
"terminated by a newline character.\n"));
do
-@@ -197,7 +197,7 @@ main (int argc, char *argv[])
+@@ -199,7 +199,7 @@ main (int argc, char *argv[])
if (feof (stdin))
break;
}
if (readbuf[strlen (readbuf) - 1] == '\n')
-@@ -214,7 +214,7 @@ main (int argc, char *argv[])
+@@ -216,7 +216,7 @@ main (int argc, char *argv[])
if (!q)
{
free (p);
_("could not convert from UTF-8 to UCS-4"));
}
-@@ -239,7 +239,7 @@ main (int argc, char *argv[])
+@@ -241,7 +241,7 @@ main (int argc, char *argv[])
if (!q)
{
free (r);
_("could not convert from UTF-8 to UCS-4"));
}
-@@ -275,7 +275,7 @@ main (int argc, char *argv[])
+@@ -277,7 +277,7 @@ main (int argc, char *argv[])
q = stringprep_utf8_to_ucs4 (p, -1, &len);
free (p);
if (!q)
_("could not convert from UTF-8 to UCS-4"));
if (args_info.debug_given)
-@@ -334,7 +334,7 @@ main (int argc, char *argv[])
+@@ -336,7 +336,7 @@ main (int argc, char *argv[])
r = stringprep_ucs4_to_utf8 (q, -1, NULL, NULL);
free (q);
if (!r)
_("could not convert from UCS-4 to UTF-8"));
p = stringprep_utf8_to_locale (r);
-@@ -358,7 +358,7 @@ main (int argc, char *argv[])
+@@ -360,7 +360,7 @@ main (int argc, char *argv[])
q = stringprep_utf8_to_ucs4 (p, -1, NULL);
free (p);
if (!q)
_("could not convert from UCS-4 to UTF-8"));
if (args_info.debug_given)
-@@ -436,7 +436,7 @@ main (int argc, char *argv[])
+@@ -438,7 +438,7 @@ main (int argc, char *argv[])
if (!q)
{
free (p);
_("could not convert from UCS-4 to UTF-8"));
}
-@@ -492,7 +492,7 @@ main (int argc, char *argv[])
+@@ -494,7 +494,7 @@ main (int argc, char *argv[])
r = stringprep_ucs4_to_utf8 (q, -1, NULL, NULL);
free (q);
if (!r)
_("could not convert from UTF-8 to UCS-4"));
p = stringprep_utf8_to_locale (r);
-@@ -521,7 +521,7 @@ main (int argc, char *argv[])
+@@ -523,7 +523,7 @@ main (int argc, char *argv[])
if (!q)
{
free (p);
_("could not convert from UTF-8 to UCS-4"));
}
-@@ -535,7 +535,7 @@ main (int argc, char *argv[])
+@@ -537,7 +537,7 @@ main (int argc, char *argv[])
r = stringprep_utf8_nfkc_normalize (p, -1);
free (p);
if (!r)
if (args_info.debug_given)
{
-@@ -545,7 +545,7 @@ main (int argc, char *argv[])
+@@ -547,7 +547,7 @@ main (int argc, char *argv[])
if (!q)
{
free (r);