1 files changed, 46 insertions, 0 deletions
diff --git a/stdio-common/bug12.c b/stdio-common/bug12.c
new file mode 100644
index 0000000000..48610c0e78
--- /dev/null
+++ b/stdio-common/bug12.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <string.h>
+
+char x[4096], z[4096], b[21], m[4096 * 4];
+
+int
+main (void)
+{
+  FILE *f = tmpfile ();
+  int i, failed = 0;
+
+  memset (x, 'x', 4096);
+  memset (z, 'z', 4096);
+  b[20] = 0;
+
+  for (i = 0; i <= 5; i++)
+    {
+      fwrite (x, 4096, 1, f);
+      fwrite (z, 4096, 1, f);
+    }
+  rewind (f);
+
+  fread (m, 4096 * 4 - 10, 1, f);
+  fread (b, 20, 1, f);
+  printf ("got %s (should be %s)\n", b, "zzzzzzzzzzxxxxxxxxxx");
+  if (strcmp (b, "zzzzzzzzzzxxxxxxxxxx"))
+    failed = 1;
+
+  fseek (f, -40, SEEK_CUR);
+  fread (b, 20, 1, f);
+  printf ("got %s (should be %s)\n", b, "zzzzzzzzzzzzzzzzzzzz");
+  if (strcmp (b, "zzzzzzzzzzzzzzzzzzzz"))
+    failed = 1;
+
+  fread (b, 20, 1, f);
+  printf ("got %s (should be %s)\n", b, "zzzzzzzzzzxxxxxxxxxx");
+  if (strcmp (b, "zzzzzzzzzzxxxxxxxxxx"))
+    failed = 1;
+
+  fread (b, 20, 1, f);
+  printf ("got %s (should be %s)\n", b, "xxxxxxxxxxxxxxxxxxxx");
+  if (strcmp (b, "xxxxxxxxxxxxxxxxxxxx"))
+    failed = 1;
+
+  return failed;
+}