1 files changed, 54 insertions, 0 deletions
diff --git a/lib/unistr/u-strcspn.h b/lib/unistr/u-strcspn.h
new file mode 100644
index 00000000..de326563
--- /dev/null
+++ b/lib/unistr/u-strcspn.h
@@ -0,0 +1,54 @@
+/* Search for some characters in UTF-8/UTF-16/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 Lesser General Public License as published
+   by the Free Software Foundation; either version 3 of the License, 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+size_t
+FUNC (const UNIT *str, const UNIT *reject)
+{
+  /* Optimize two cases.  */
+  if (reject[0] == 0)
+    return U_STRLEN (str);
+  {
+    ucs4_t uc;
+    int count = U_STRMBTOUC (&uc, reject);
+    if (count >= 0 && reject[count] == 0)
+      {
+	const UNIT *found = U_STRCHR (str, uc);
+	if (found != NULL)
+	  return found - str;
+	else
+	  return U_STRLEN (str);
+      }
+  }
+  /* General case.  */
+  {
+    const UNIT *ptr = str;
+
+    for (;;)
+      {
+	ucs4_t uc;
+	int count = U_STRMBTOUC (&uc, ptr);
+	if (count == 0)
+	  return ptr - str;
+	if (count < 0)
+	  break;
+	if (U_STRCHR (reject, uc))
+	  return ptr - str;
+	ptr += count;
+      }
+    return U_STRLEN (str);
+  }
+}