1 files changed, 44 insertions, 0 deletions
diff --git a/libc/string/strspn.c b/libc/string/strspn.c
new file mode 100644
index 000000000..2094caa86
--- /dev/null
+++ b/libc/string/strspn.c
@@ -0,0 +1,44 @@
+/* Copyright (C) 1992, 1993 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library 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.
+
+The GNU C Library 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 the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <string.h>
+
+/* Return the length of the maximum initial segment
+   of S which contains only characters in ACCEPT.  */
+size_t
+strspn(s, accept)
+char *s;
+char *accept;
+{
+  register char *p;
+  register char *a;
+  register 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;
+}