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

[gnulib.git] / lib / unistr / u32-strmblen.c

diff --git a/lib/unistr/u32-strmblen.c b/lib/unistr/u32-strmblen.c
new file mode 100644 (file)
index 0000000..2726e08
--- /dev/null
+++ b/lib/unistr/u32-strmblen.c
@@ -0,0 +1,38 @@
+/* Look at first character in UTF-32 string.
+   Copyright (C) 2002, 2006-2007 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"
+
+int
+u32_strmblen (const uint32_t *s)
+{
+  uint32_t c = *s;
+
+#if CONFIG_UNICODE_SAFETY
+  if (c < 0xd800 || (c >= 0xe000 && c < 0x110000))
+#endif
+    return (c != 0 ? 1 : 0);
+#if CONFIG_UNICODE_SAFETY
+  /* invalid multibyte character */
+  return -1;
+#endif
+}