1 files changed, 81 insertions, 0 deletions
diff --git a/libio/tst-ungetwc2.c b/libio/tst-ungetwc2.c
new file mode 100644
index 0000000000..9064427532
--- /dev/null
+++ b/libio/tst-ungetwc2.c
@@ -0,0 +1,81 @@
+/* Taken from the Li18nux base test suite.  */
+
+#define _XOPEN_SOURCE 500
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <wchar.h>
+
+int
+main (void)
+{
+  FILE *fp;
+  char *str = "abcdef";
+  wint_t ret, wc;
+  char fname[] = "/tmp/tst-ungetwc2.out.XXXXXX";
+  int fd;
+  long int pos;
+  int result = 0;
+
+  puts ("This program runs on en_US.UTF-8 locale.");
+  if (setlocale (LC_ALL, "en_US.UTF-8") == NULL)
+    {
+      fprintf (stderr, "Err: Cannot run on the en_US.UTF-8 locale\n");
+      exit (EXIT_FAILURE);
+    }
+
+  /* Write some characters to `testfile'. */
+  fd = mkstemp (fname);
+  if (fd == -1)
+    {
+      printf ("cannot open temp file: %m\n");
+      exit (EXIT_FAILURE);
+    }
+  if ((fp = fdopen (fd, "w")) == NULL)
+    {
+      fprintf (stderr, "Cannot open 'testfile'.\n");
+      exit (EXIT_FAILURE);
+    }
+  fputs (str, fp);
+  fclose (fp);
+
+  /* Open `testfile'. */
+  if ((fp = fopen (fname, "r")) == NULL)
+    {
+      fprintf (stderr, "Cannot open 'testfile'.");
+      exit (EXIT_FAILURE);
+    }
+
+  /* Get a character. */
+  wc = getwc (fp);
+  pos = ftell (fp);
+  printf ("After get a character: %ld\n", pos);
+  if (pos != 1)
+    result = 1;
+
+  /* Unget a character. */
+  ret = ungetwc (wc, fp);
+  if (ret == WEOF)
+    {
+      fprintf (stderr, "ungetwc() returns NULL.");
+      exit (EXIT_FAILURE);
+    }
+  pos = ftell (fp);
+  printf ("After unget a character: %ld\n", pos);
+  if (pos != 0)
+    result = 1;
+
+  /* Reget a character. */
+  wc = getwc (fp);
+  pos = ftell (fp);
+  printf ("After reget a character: %ld\n", pos);
+  if (pos != 1)
+    result = 1;
+
+  fclose (fp);
+
+  unlink (fname);
+
+  return result;
+}