1 files changed, 136 insertions, 0 deletions
diff --git a/libio/bug-wmemstream1.c b/libio/bug-wmemstream1.c
new file mode 100644
index 0000000000..22d67f71e9
--- /dev/null
+++ b/libio/bug-wmemstream1.c
@@ -0,0 +1,136 @@
+#include <stdio.h>
+#include <string.h>
+#include <wchar.h>
+
+
+static int
+do_test (void)
+{
+  size_t size;
+  wchar_t *buf;
+  FILE *fp = open_wmemstream (&buf, &size);
+  if (fp == NULL)
+    {
+      puts ("open_wmemstream failed");
+      return 1;
+    }
+
+  off64_t off = ftello64 (fp);
+  if (off != 0)
+    {
+      puts ("initial position wrong");
+      return 1;
+    }
+
+  if (fseek (fp, 32768, SEEK_SET) != 0)
+    {
+      puts ("fseek failed");
+      return 1;
+    }
+
+  if (fputws (L"foo", fp) == EOF)
+    {
+      puts ("fputws failed");
+      return 1;
+    }
+
+  if (fclose (fp) == EOF)
+    {
+      puts ("fclose failed");
+      return 1;
+    }
+
+  if (size != 32768 + 3)
+    {
+      printf ("expected size %d, got %zu\n", 32768 + 3, size);
+      return 1;
+    }
+
+  for (int i = 0; i < 32768; ++i)
+    if (buf[i] != L'\0')
+      {
+	printf ("wide character at offset %d is %#x\n",
+		i, (unsigned int) buf[i]);
+	return 1;
+      }
+
+  if (wmemcmp (buf + 32768, L"foo", 3) != 0)
+    {
+      puts ("written string incorrect");
+      return 1;
+    }
+
+  /* Mark the buffer.  */
+  wmemset (buf, L'A', size);
+  free (buf);
+
+  /* Try again, this time with write mode enabled before the seek.  */
+  fp = open_wmemstream (&buf, &size);
+  if (fp == NULL)
+    {
+      puts ("2nd open_wmemstream failed");
+      return 1;
+    }
+
+  off = ftello64 (fp);
+  if (off != 0)
+    {
+      puts ("2nd initial position wrong");
+      return 1;
+    }
+
+  if (fputws (L"bar", fp) == EOF)
+    {
+      puts ("2nd fputws failed");
+      return 1;
+    }
+
+  if (fseek (fp, 32768, SEEK_SET) != 0)
+    {
+      puts ("2nd fseek failed");
+      return 1;
+    }
+
+  if (fputws (L"foo", fp) == EOF)
+    {
+      puts ("3rd fputws failed");
+      return 1;
+    }
+
+  if (fclose (fp) == EOF)
+    {
+      puts ("2nd fclose failed");
+      return 1;
+    }
+
+  if (size != 32768 + 3)
+    {
+      printf ("2nd expected size %d, got %zu\n", 32768 + 3, size);
+      return 1;
+    }
+
+  if (wmemcmp (buf, L"bar", 3) != 0)
+    {
+      puts ("initial string incorrect in 2nd try");
+      return 1;
+    }
+
+  for (int i = 3; i < 32768; ++i)
+    if (buf[i] != L'\0')
+      {
+	printf ("wide character at offset %d is %#x in 2nd try\n",
+		i, (unsigned int) buf[i]);
+	return 1;
+      }
+
+  if (wmemcmp (buf + 32768, L"foo", 3) != 0)
+    {
+      puts ("written string incorrect in 2nd try");
+      return 1;
+    }
+
+  return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"