1 files changed, 98 insertions, 0 deletions
diff --git a/libio/bug-ungetc2.c b/libio/bug-ungetc2.c
new file mode 100644
index 0000000000..652f7e956c
--- /dev/null
+++ b/libio/bug-ungetc2.c
@@ -0,0 +1,98 @@
+#include <stdio.h>
+#include <sys/types.h>
+
+
+static int
+check (FILE *fp, off_t o)
+{
+  int result = 0;
+  if (feof (fp))
+    {
+      puts ("feof !");
+      result = 1;
+    }
+  if (ferror (fp))
+    {
+      puts ("ferror !");
+      result = 1;
+    }
+  if (ftello (fp) != o)
+    {
+      printf ("position = %lu, not %lu\n", (unsigned long int) ftello (fp),
+	      (unsigned long int) o);
+      result = 1;
+    }
+  return result;
+}
+
+
+static int
+do_test (void)
+{
+  FILE *fp = tmpfile ();
+  if (fp == NULL)
+    {
+      puts ("tmpfile failed");
+      return 1;
+    }
+  if (check (fp, 0) != 0)
+    return 1;
+
+  puts ("going to write");
+  if (fputs ("hello", fp) == EOF)
+    {
+      puts ("fputs failed");
+      return 1;
+    }
+  if (check (fp, 5) != 0)
+    return 1;
+
+  puts ("going to rewind");
+  rewind (fp);
+  if (check (fp, 0) != 0)
+    return 1;
+
+  puts ("going to read char");
+  int c = fgetc (fp);
+  if (c != 'h')
+    {
+      printf ("read %c, not %c\n", c, 'h');
+      return 1;
+    }
+  if (check (fp, 1) != 0)
+    return 1;
+
+  puts ("going to put back");
+  if (ungetc (' ', fp) == EOF)
+    {
+      puts ("ungetc failed");
+      return 1;
+    }
+  if (check (fp, 0) != 0)
+    return 1;
+
+  puts ("going to write again");
+  if (fputs ("world", fp) == EOF)
+    {
+      puts ("2nd fputs failed");
+      return 1;
+    }
+  if (check (fp, 5) != 0)
+    return 1;
+
+  puts ("going to rewind again");
+  rewind (fp);
+  if (check (fp, 0) != 0)
+    return 1;
+
+  if (fclose (fp) != 0)
+    {
+      puts ("fclose failed");
+      return 1;
+    }
+
+  return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"