X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstring%2Fstrxfrm.c;h=9b6192275500c51aa650ef3a89476bddc1c03d4e;hb=d6f1494a4f38a212b29a13ee713885058dcf0fe7;hp=6f8a59e9af966ea11ba89894fe96c3d6daafdc89;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec;p=pdclib

diff --git a/functions/string/strxfrm.c b/functions/string/strxfrm.c
index 6f8a59e..9b61922 100644
--- a/functions/string/strxfrm.c
+++ b/functions/string/strxfrm.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 strxfrm( char * restrict s1, const char * restrict s2, size_t n ) { /* TODO */ };
+/* 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 <string.h>
+
+#ifndef REGTEST
+
+#include <locale.h>
+
+size_t strxfrm( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2, size_t n )
+{
+    size_t len = strlen( s2 );
+    if ( len < n )
+    {
+        /* Cannot use strncpy() here as the filling of s1 with '\0' is not part
+           of the spec.
+        */
+        while ( n-- && ( *s1++ = _PDCLIB_lconv.ctype[(unsigned char)*s2++].collation ) );
+    }
+    return len;
+}
+
+#endif
+
+#ifdef TEST
+#include "_PDCLIB_test.h"
+
+int main( void )
+{
+    char s[] = "xxxxxxxxxxx";
+    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
+