X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstring%2Fstrcspn.c;h=9d6663ebcfb59267c5f9fb23a561dc8fd5bc7c42;hb=e1c526e9bad3f6e69391e94059096145390508d3;hp=80c620cb03c8749e514c7d81caefd9372ce5a01b;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec;p=pdclib

diff --git a/functions/string/strcspn.c b/functions/string/strcspn.c
index 80c620c..9d6663e 100644
--- a/functions/string/strcspn.c
+++ b/functions/string/strcspn.c
@@ -1,8 +1,48 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-size_t strcspn( const char * s1, const char * s2 ) { /* TODO */ };
+/* strcspn( 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 strcspn( const char * s1, const char * s2 )
+{
+    size_t len = 0;
+    const char * p;
+    while ( s1[len] )
+    {
+        p = s2;
+        while ( *p )
+        {
+            if ( s1[len] == *p++ )
+            {
+                return len;
+            }
+        }
+        ++len;
+    }
+    return len;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    TESTCASE( strcspn( abcde, "x" ) == 5 );
+    TESTCASE( strcspn( abcde, "xyz" ) == 5 );
+    TESTCASE( strcspn( abcde, "zyx" ) == 5 );
+    TESTCASE( strcspn( abcdx, "x" ) == 4 );
+    TESTCASE( strcspn( abcdx, "xyz" ) == 4 );
+    TESTCASE( strcspn( abcdx, "zyx" ) == 4 );
+    TESTCASE( strcspn( abcde, "a" ) == 0 );
+    TESTCASE( strcspn( abcde, "abc" ) == 0 );
+    TESTCASE( strcspn( abcde, "cba" ) == 0 );
+    return TEST_RESULTS;
+}
+#endif