New modules 'unistr/u8-check', 'unistr/u16-check', 'unistr/u32-check'.

1 files changed, 41 insertions, 0 deletions

diff --git a/lib/unistr/u32-check.c b/lib/unistr/u32-check.c
new file mode 100644
index 0000000000..6793760b80
--- /dev/null
+++ b/lib/unistr/u32-check.c
@@ -0,0 +1,41 @@
+/* Check UTF-32 string.
+   Copyright (C) 2002, 2006 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2002.
+
+   This program is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Library General Public License as published
+   by the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+   USA.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "unistr.h"
+
+const uint32_t *
+u32_check (const uint32_t *s, size_t n)
+{
+  const uint32_t *s_end = s + n;
+
+  while (s < s_end)
+    {
+      uint32_t c = *s;
+
+      if (c < 0xd800 || (c >= 0xe000 && c < 0x110000))
+	s++;
+      else
+	/* invalid Unicode character */
+	return s;
+    }
+  return NULL;
+}