Update test script.

test-corpus.sh

@@ -2,7 +2,7 @@
 #
 # Script to test PDFio against a directory of PDF files.
 #
-# Copyright © 2025 by Michael R Sweet.
+# Copyright © 2025-2026 by Michael R Sweet.
 #
 # Licensed under Apache License v2.0.  See the file "LICENSE" for more
 # information.
@@ -17,14 +17,24 @@ if test $# = 0; then
     exit 1
 fi
 
+if (echo "testing\c"; echo 1,2,3) | grep c >/dev/null; then
+        ac_n=-n
+        ac_c=
+else
+        ac_n=
+        ac_c='\c'
+fi
+
 for file in $(find "$@" -name \*.pdf -print); do
     # Run testpdfio to test loading the file...
+    echo $ac_n "\r$file$ac_c"
     ./testpdfio $file >$file.log 2>&1
     if test $? = 0; then
     	# Passed
+        echo $ac_n "\r                                                              $ac_c"
         rm -f $file.log
     else
     	# Failed, preserve log and write filename to stdout...
-        echo $file
+    	echo ""
     fi
 done