New module 'wcstok'.

[gnulib.git] / lib / wcstok-impl.h

diff --git a/lib/wcstok-impl.h b/lib/wcstok-impl.h
new file mode 100644 (file)
index 0000000..afb9046
--- /dev/null
+++ b/lib/wcstok-impl.h
@@ -0,0 +1,50 @@
+/* Split a wide string into tokens.
+   Copyright (C) 1999, 2011 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 1999.
+
+   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 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+wchar_t *
+wcstok (wchar_t *wcs, const wchar_t *delim, wchar_t **ptr)
+{
+  if (wcs == NULL)
+    {
+      wcs = *ptr;
+      if (wcs == NULL)
+        return NULL; /* reminder that end of token sequence has been reached */
+    }
+
+  /* Skip leading delimiters.  */
+  wcs += wcsspn (wcs, delim);
+
+  /* Found a token?  */
+  if (*wcs == (wchar_t)'\0')
+    {
+      *ptr = NULL;
+      return NULL;
+    }
+  /* Move past the token.  */
+  {
+    wchar_t *token_end = wcspbrk (wcs, delim);
+    if (token_end)
+      {
+        /* NUL-terminate the token.  */
+        *token_end = (wchar_t)'\0';
+        *ptr = token_end + 1;
+      }
+    else
+      *ptr = NULL;
+  }
+  return wcs;
+}