This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / frv / kernel / uaccess.c

diff --git a/arch/frv/kernel/uaccess.c b/arch/frv/kernel/uaccess.c
new file mode 100644 (file)
index 0000000..f3fd58a
--- /dev/null
+++ b/arch/frv/kernel/uaccess.c
@@ -0,0 +1,95 @@
+/* uaccess.c: userspace access functions
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/mm.h>
+#include <asm/uaccess.h>
+
+/*****************************************************************************/
+/*
+ * copy a null terminated string from userspace
+ */
+long strncpy_from_user(char *dst, const char *src, long count)
+{
+       unsigned long max;
+       char *p, ch;
+       long err = -EFAULT;
+
+       if (count < 0)
+               BUG();
+
+       p = dst;
+
+#ifndef CONFIG_MMU
+       if ((unsigned long) src < memory_start)
+               goto error;
+#endif
+
+       if ((unsigned long) src >= get_addr_limit())
+               goto error;
+
+       max = get_addr_limit() - (unsigned long) src;
+       if ((unsigned long) count > max) {
+               memset(dst + max, 0, count - max);
+               count = max;
+       }
+
+       err = 0;
+       for (; count > 0; count--, p++, src++) {
+               __get_user_asm(err, ch, src, "ub", "=r");
+               if (err < 0)
+                       goto error;
+               if (!ch)
+                       break;
+               *p = ch;
+       }
+
+       err = p - dst; /* return length excluding NUL */
+
+ error:
+       if (count > 0)
+               memset(p, 0, count); /* clear remainder of buffer [security] */
+
+       return err;
+} /* end strncpy_from_user() */
+
+/*****************************************************************************/
+/*
+ * Return the size of a string (including the ending 0)
+ *
+ * Return 0 on exception, a value greater than N if too long
+ */
+long strnlen_user(const char *src, long count)
+{
+       const char *p;
+       long err = 0;
+       char ch;
+
+       if (count < 0)
+               BUG();
+
+#ifndef CONFIG_MMU
+       if ((unsigned long) src < memory_start)
+               return 0;
+#endif
+
+       if ((unsigned long) src >= get_addr_limit())
+               return 0;
+
+       for (p = src; count > 0; count--, p++) {
+               __get_user_asm(err, ch, p, "ub", "=r");
+               if (err < 0)
+                       return 0;
+               if (!ch)
+                       break;
+       }
+
+       return p - src + 1; /* return length including NUL */
+} /* end strnlen_user() */