Update.

	* libio/fmemopen.c (fmemopen_seek): SEEK_END should count from
	maximum used address, not maximum buffer position.

1 files changed, 67 insertions, 0 deletions

diff --git a/stdio-common/tst-fmemopen2.c b/stdio-common/tst-fmemopen2.c
new file mode 100644
index 0000000..6a0ee83
--- /dev/null
+++ b/stdio-common/tst-fmemopen2.c
@@ -0,0 +1,67 @@
+#include <assert.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+
+static int
+do_test (void)
+{
+  int result = 0;
+  char buf[100];
+  FILE *fp = fmemopen (buf, sizeof (buf), "w");
+  if (fp == NULL)
+    {
+      puts ("fmemopen failed");
+      return 0;
+    }
+  static const char str[] = "hello world";
+#define nstr (sizeof (str) - 1)
+  fputs (str, fp);
+  off_t o = ftello (fp);
+  if (o != nstr)
+    {
+      printf ("first ftello returned %ld, expected %zu\n", o, nstr);
+      result = 1;
+    }
+  rewind (fp);
+  o = ftello (fp);
+  if (o != 0)
+    {
+      printf ("second ftello returned %ld, expected %zu\n", o, 0);
+      result = 1;
+    }
+  if (fseeko (fp, 0, SEEK_END) != 0)
+    {
+      puts ("fseeko failed");
+      return 1;
+    }
+  o = ftello (fp);
+  if (o != nstr)
+    {
+      printf ("third ftello returned %ld, expected %zu\n", o, nstr);
+      result = 1;
+    }
+  rewind (fp);
+  static const char str2[] = "just hello";
+#define nstr2 (sizeof (str2) - 1)
+  assert (nstr2 < nstr);
+  fputs (str2, fp);
+  o = ftello (fp);
+  if (o != nstr2)
+    {
+      printf ("fourth ftello returned %ld, expected %zu\n", o, nstr2);
+      result = 1;
+    }
+  fclose (fp);
+  static const char str3[] = "just hellod";
+  if (strcmp (buf, str3) != 0)
+    {
+      printf ("final string is \"%s\", expected \"%s\"\n",
+              buf, str3);
+      result = 1;
+    }
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"