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1 files changed, 44 insertions, 0 deletions

diff --git a/lib/strcspn.c b/lib/strcspn.c
new file mode 100644
index 0000000..9fbc5de
--- /dev/null
+++ b/lib/strcspn.c
@@ -0,0 +1,44 @@
+/* Copyright (C) 1991, 1994, 1996-1997, 2002-2003 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@gnu.org.
+
+   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 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 General Public License for more details.
+
+   You should have received a copy of the GNU 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.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stddef.h>
+#include <string.h>
+
+#undef strcspn
+
+/* Return the length of the maximum initial segment of S
+   which contains no characters from REJECT.  */
+size_t
+strcspn (const char *s, const char *reject)
+{
+  size_t count = 0;
+
+  while (*s != '\0')
+    if (strchr (reject, *s++) == NULL)
+      ++count;
+    else
+      return count;
+
+  return count;
+}