PDCLIB-2: Pure wide character functions

[pdclib] / functions / wchar / wcsstr.c

diff --git a/functions/wchar/wcsstr.c b/functions/wchar/wcsstr.c
new file mode 100644 (file)
index 0000000..a2162f8
--- /dev/null
+++ b/functions/wchar/wcsstr.c
@@ -0,0 +1,49 @@
+/* wcsstr( const wchar_t *, const wchar_t * )\r
+\r
+   This file is part of the Public Domain C Library (PDCLib).\r
+   Permission is granted to use, modify, and / or redistribute at will.\r
+*/\r
+\r
+#include <wchar.h>\r
+\r
+#ifndef REGTEST\r
+\r
+wchar_t * wcsstr( const wchar_t * s1, const wchar_t * s2 )\r
+{\r
+    const wchar_t * p1 = s1;\r
+    const wchar_t * p2;\r
+    while ( *s1 )\r
+    {\r
+        p2 = s2;\r
+        while ( *p2 && ( *p1 == *p2 ) )\r
+        {\r
+            ++p1;\r
+            ++p2;\r
+        }\r
+        if ( ! *p2 )\r
+        {\r
+            return (wchar_t *) s1;\r
+        }\r
+        ++s1;\r
+        p1 = s1;\r
+    }\r
+    return NULL;\r
+}\r
+\r
+#endif\r
+\r
+#ifdef TEST\r
+#include <_PDCLIB_test.h>\r
+\r
+int main( void )\r
+{\r
+    wchar_t s[] = L"abcabcabcdabcde";\r
+    TESTCASE( wcsstr( s, L"x" ) == NULL );\r
+    TESTCASE( wcsstr( s, L"xyz" ) == NULL );\r
+    TESTCASE( wcsstr( s, L"a" ) == &s[0] );\r
+    TESTCASE( wcsstr( s, L"abc" ) == &s[0] );\r
+    TESTCASE( wcsstr( s, L"abcd" ) == &s[6] );\r
+    TESTCASE( wcsstr( s, L"abcde" ) == &s[10] );\r
+    return TEST_RESULTS;\r
+}\r
+#endif\r