X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstring%2Fstrxfrm.c;h=4b81c9375c624f47b50329b8ed16abf8fbd678b0;hb=40d0246771c8e593d4b5fdc97dd87b4afd260be2;hp=a971e38d572ada95e9a5a7168ccb4365a0465566;hpb=1d9d92ba957a0b8307c9a65c35867fde68e6533b;p=pdclib

diff --git a/functions/string/strxfrm.c b/functions/string/strxfrm.c
index a971e38..4b81c93 100644
--- a/functions/string/strxfrm.c
+++ b/functions/string/strxfrm.c
@@ -1,23 +1,52 @@
-/* ----------------------------------------------------------------------------
- * $Id$
- * ----------------------------------------------------------------------------
- * Public Domain C Library - http://pdclib.sourceforge.net
- * This code is Public Domain. Use, modify, and redistribute at will.
- * --------------------------------------------------------------------------*/
+/* $Id$ */
 
-#include <__size_t.h>
+/* Release $Name$ */
 
-/* TODO: Dummy function, no locale support yet. */
+/* strxfrm( char *, const char *, size_t )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <_PDCLIB_aux.h>
+#include <string.h>
 
-size_t strlen( const char * src );
-char * strncpy( char * restrict dest, const char * restrict src, size_t n );
+#ifndef REGTEST
 
-size_t strxfrm( char * restrict dest, const char * restrict src, size_t n )
+/* TODO: Dummy function, no locale support yet. */
+size_t strxfrm( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2, size_t n )
 {
-    size_t len = strlen( src );
+    size_t len = strlen( s2 );
     if ( len < n )
     {
-        strncpy( dest, src, len );
+        /* Cannot use strncpy() here as the filling of s1 with '\0' is not part
+           of the spec.
+        */
+        while ( n-- && ( *s1++ = *s2++ ) );
     }
     return len;
 }
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main()
+{
+    char s[] = "xxxxxxxxxxx";
+    BEGIN_TESTS;
+    TESTCASE( strxfrm( NULL, "123456789012", 0 ) == 12 );
+    TESTCASE( strxfrm( s, "123456789012", 12 ) == 12 );
+    /*
+    The following test case is true in *this* implementation, but doesn't have to.
+    TESTCASE( s[0] == 'x' );
+    */
+    TESTCASE( strxfrm( s, "1234567890", 11 ) == 10 );
+    TESTCASE( s[0] == '1' );
+    TESTCASE( s[9] == '0' );
+    TESTCASE( s[10] == '\0' );
+    return TEST_RESULTS;
+}
+#endif
+