+/* Copyright (C) 1991, 1997 Free Software Foundation, Inc.
+
+ NOTE: The canonical source of this file is maintained with the GNU
+ C Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
+
+ 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 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with this program; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place -
+ Suite 330, Boston, MA 02111-1307, USA. */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#if defined _LIBC || HAVE_STRING_H
+# include <string.h>
+#else
+# include <strings.h>
+# ifndef strchr
+# define strchr index
+# endif
+#endif
+
+#undef strspn
+
+/* Return the length of the maximum initial segment
+ of S which contains only characters in ACCEPT. */
+size_t
+strspn (s, accept)
+ const char *s;
+ const char *accept;
+{
+ const char *p;
+ const char *a;
+ size_t count = 0;
+
+ for (p = s; *p != '\0'; ++p)
+ {
+ for (a = accept; *a != '\0'; ++a)
+ if (*p == *a)
+ break;
+ if (*a == '\0')
+ return count;
+ else
+ ++count;
+ }
+
+ return count;
+}