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

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

diff --git a/lib/unistr/u32-strcspn.c b/lib/unistr/u32-strcspn.c
new file mode 100644 (file)
index 0000000..c543d4f
--- /dev/null
+++ b/lib/unistr/u32-strcspn.c
@@ -0,0 +1,53 @@
+/* Search for some characters in UTF-32 string.
+   Copyright (C) 1999, 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"
+
+#define FUNC u32_strcspn
+#define UNIT uint32_t
+#define U_STRLEN u32_strlen
+#define U_STRCHR u32_strchr
+
+size_t
+FUNC (const UNIT *str, const UNIT *reject)
+{
+  /* Optimize two cases.  */
+  if (reject[0] == 0)
+    return U_STRLEN (str);
+  if (reject[1] == 0)
+    {
+      ucs4_t uc = reject[0];
+      const UNIT *ptr = str;
+      for (; *ptr != 0; ptr++)
+       if (*ptr == uc)
+         break;
+      return ptr - str;
+    }
+  /* General case.  */
+  {
+    const UNIT *ptr = str;
+    for (; *ptr != 0; ptr++)
+      if (U_STRCHR (reject, *ptr))
+       break;
+    return ptr - str;
+  }
+}