1 files changed, 50 insertions, 0 deletions
diff --git a/src/pdclib/functions/string/strcspn.c b/src/pdclib/functions/string/strcspn.c
new file mode 100644
index 0000000..84f8af1
--- /dev/null
+++ b/src/pdclib/functions/string/strcspn.c
@@ -0,0 +1,50 @@
+/* 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