X-Git-Url: https://pd.if.org/git/?p=pdclib;a=blobdiff_plain;f=functions%2Fstring%2Fstrxfrm.c;h=3692257b234f1fa02e42297ec0749390f6bc5f2f;hp=96c29e1c3b876c928ef1aba6b7824b77a6761ae7;hb=da0f3f353d417fed71f358a48d5d5394145e460d;hpb=0a5395faab237ba9008352b0f4bee9659bbd3d5f

diff --git a/functions/string/strxfrm.c b/functions/string/strxfrm.c
index 96c29e1..3692257 100644
--- a/functions/string/strxfrm.c
+++ b/functions/string/strxfrm.c
@@ -1,22 +1,48 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
+/* strxfrm( char *, const char *, size_t )
 
-size_t strxfrm( char * restrict s1, const char * restrict s2, size_t n ) { /* TODO */ };
+   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
 
-/* PDPC code - unreviewed
+#include "_PDCLIB_locale.h"
+
+size_t strxfrm( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2, size_t n )
 {
-    size_t oldlen;
-    
-    oldlen = strlen(s2);
-    if (oldlen < n)
+    const _PDCLIB_ctype_t *ctype = _PDCLIB_threadlocale()->_CType;
+    size_t len = strlen( s2 );
+    if ( len < n )
     {
-        memcpy(s1, s2, oldlen);
-        s1[oldlen] = '\0';
+        /* Cannot use strncpy() here as the filling of s1 with '\0' is not part
+           of the spec.
+        */
+        while ( n-- && ( *s1++ = ctype[(unsigned char)*s2++].collation ) );
     }
-    return (oldlen);
+    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
+