X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fwchar%2Fwcsncmp.c;fp=functions%2Fwchar%2Fwcsncmp.c;h=920d64719203e86ecc81f43b46c9946ea7c968f3;hb=507d3eccbf4c74e4694165f9e00ab79d894b4f66;hp=0000000000000000000000000000000000000000;hpb=0150bb9ffe66236b6a47c5800d8beef669d5c047;p=pdclib.old

diff --git a/functions/wchar/wcsncmp.c b/functions/wchar/wcsncmp.c
new file mode 100644
index 0000000..920d647
--- /dev/null
+++ b/functions/wchar/wcsncmp.c
@@ -0,0 +1,54 @@
+/* $Id$ */
+
+/* wcsncmp( const wchar_t *, const wchar_t *, 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 <wchar.h>
+
+#ifndef REGTEST
+
+int wcsncmp( const wchar_t * s1, const wchar_t * s2, size_t n )
+{
+    while ( *s1 && n && ( *s1 == *s2 ) )
+    {
+        ++s1;
+        ++s2;
+        --n;
+    }
+    if ( ( n == 0 ) )
+    {
+        return 0;
+    }
+    else
+    {
+        return ( *(wchar_t *)s1 - *(wchar_t *)s2 );
+    }
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    wchar_t cmpabcde[] = L"abcde\0f";
+    wchar_t cmpabcd_[] = L"abcde\xfc";
+    wchar_t empty[] = L"";
+    wchar_t x[] = L"x";
+    TESTCASE( wcsncmp( wabcde, cmpabcde, 5 ) == 0 );
+    TESTCASE( wcsncmp( wabcde, cmpabcde, 10 ) == 0 );
+    TESTCASE( wcsncmp( wabcde, wabcdx, 5 ) < 0 );
+    TESTCASE( wcsncmp( wabcdx, wabcde, 5 ) > 0 );
+    TESTCASE( wcsncmp( empty, wabcde, 5 ) < 0 );
+    TESTCASE( wcsncmp( wabcde, empty, 5 ) > 0 );
+    TESTCASE( wcsncmp( wabcde, wabcdx, 4 ) == 0 );
+    TESTCASE( wcsncmp( wabcde, x, 0 ) == 0 );
+    TESTCASE( wcsncmp( wabcde, x, 1 ) < 0 );
+    TESTCASE( wcsncmp( wabcde, cmpabcd_, 10 ) < 0 );
+    return TEST_RESULTS;
+}
+#endif