-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-size_t strspn( const char * s1, const char * s2 ) { /* TODO */ };
+/* $Id$ */
+
+/* Release $Name$ */
+
+/* strspn( const char *, const char * )
+
+ This file is part of the Public Domain C Library (PDCLib).
+ Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <string.h>
+
+#ifndef REGTEST
+
+size_t strspn( const char * s1, const char * s2 )
+{
+ size_t len = 0;
+ const char * p;
+ while ( s1[ len ] )
+ {
+ p = s2;
+ while ( *p )
+ {
+ if ( s1[len] == *p )
+ {
+ break;
+ }
+ ++p;
+ }
+ if ( ! *p )
+ {
+ return len;
+ }
+ ++len;
+ }
+ return len;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+ TESTCASE( strspn( abcde, "abc" ) == 3 );
+ TESTCASE( strspn( abcde, "b" ) == 0 );
+ TESTCASE( strspn( abcde, abcde ) == 5 );
+ return TEST_RESULTS;
+}
+#endif