X-Git-Url: https://pd.if.org/git/?p=pdclib;a=blobdiff_plain;f=functions%2Fstring%2Fstrspn.c;h=8869a846834607887a9c25bc50aef3f9baf2fc9c;hp=47b28618b7a0004072d85fb0a0171b5c1957f3ff;hb=da0f3f353d417fed71f358a48d5d5394145e460d;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec

diff --git a/functions/string/strspn.c b/functions/string/strspn.c
index 47b2861..8869a84 100644
--- a/functions/string/strspn.c
+++ b/functions/string/strspn.c
@@ -1,8 +1,47 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// 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 */ };
+/* 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