X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fwchar%2Fwcsstr.c;fp=functions%2Fwchar%2Fwcsstr.c;h=a2162f8f148cd0669284e2a08e5c393dd7fdb1b8;hb=14b5b78e19a79f590233caee7848e7cb19084088;hp=0000000000000000000000000000000000000000;hpb=41777e3d5dc655f59a8c3bcd071639e6878e853a;p=pdclib

diff --git a/functions/wchar/wcsstr.c b/functions/wchar/wcsstr.c
new file mode 100644
index 0000000..a2162f8
--- /dev/null
+++ b/functions/wchar/wcsstr.c
@@ -0,0 +1,49 @@
+/* wcsstr( const wchar_t *, const wchar_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
+
+wchar_t * wcsstr( const wchar_t * s1, const wchar_t * s2 )
+{
+    const wchar_t * p1 = s1;
+    const wchar_t * p2;
+    while ( *s1 )
+    {
+        p2 = s2;
+        while ( *p2 && ( *p1 == *p2 ) )
+        {
+            ++p1;
+            ++p2;
+        }
+        if ( ! *p2 )
+        {
+            return (wchar_t *) s1;
+        }
+        ++s1;
+        p1 = s1;
+    }
+    return NULL;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    wchar_t s[] = L"abcabcabcdabcde";
+    TESTCASE( wcsstr( s, L"x" ) == NULL );
+    TESTCASE( wcsstr( s, L"xyz" ) == NULL );
+    TESTCASE( wcsstr( s, L"a" ) == &s[0] );
+    TESTCASE( wcsstr( s, L"abc" ) == &s[0] );
+    TESTCASE( wcsstr( s, L"abcd" ) == &s[6] );
+    TESTCASE( wcsstr( s, L"abcde" ) == &s[10] );
+    return TEST_RESULTS;
+}
+#endif