vbscript: Added InStrRev implementation.

dlls/vbscript/global.c

@@ -1777,10 +1777,62 @@ static HRESULT Global_StrReverse(vbdisp_t *This, VARIANT *arg, unsigned args_cnt
     return return_bstr(res, ret);
 }
 
-static HRESULT Global_InStrRev(vbdisp_t *This, VARIANT *arg, unsigned args_cnt, VARIANT *res)
+static HRESULT Global_InStrRev(vbdisp_t *This, VARIANT *args, unsigned args_cnt, VARIANT *res)
 {
-    FIXME("\n");
-    return E_NOTIMPL;
+    int start, ret = 0;
+    BSTR str1, str2;
+    HRESULT hres;
+
+    TRACE("%s %s arg_cnt=%u\n", debugstr_variant(args), debugstr_variant(args+1), args_cnt);
+
+    if(args_cnt > 3) {
+        FIXME("Unsupported args\n");
+        return E_NOTIMPL;
+    }
+
+    assert(2 <= args_cnt && args_cnt <= 4);
+
+    if(V_VT(args) == VT_NULL || V_VT(args+1) == VT_NULL || V_VT(args+2) == VT_NULL)
+        return MAKE_VBSERROR(VBSE_ILLEGAL_NULL_USE);
+
+    hres = to_string(args, &str1);
+    if(FAILED(hres))
+        return hres;
+
+    hres = to_string(args+1, &str2);
+    if(SUCCEEDED(hres)) {
+        if(args_cnt > 2) {
+            hres = to_int(args+2, &start);
+            if(SUCCEEDED(hres) && start <= 0) {
+                FIXME("Unsupported start %d\n", start);
+                hres = E_NOTIMPL;
+            }
+        }else {
+            start = SysStringLen(str1);
+        }
+    }
+
+    if(SUCCEEDED(hres)) {
+        const WCHAR *ptr;
+        size_t len;
+
+        len = SysStringLen(str2);
+        if(start >= len && start <= SysStringLen(str1)) {
+            for(ptr = str1+start-SysStringLen(str2); ptr >= str1; ptr--) {
+                if(!memcmp(ptr, str2, len*sizeof(WCHAR))) {
+                    ret = ptr-str1+1;
+                    break;
+                }
+            }
+        }
+    }
+
+    SysFreeString(str1);
+    SysFreeString(str2);
+    if(FAILED(hres))
+        return hres;
+
+    return return_int(res, ret);
 }
 
 static HRESULT Global_LoadPicture(vbdisp_t *This, VARIANT *arg, unsigned args_cnt, VARIANT *res)

dlls/vbscript/tests/api.vbs

@@ -282,6 +282,64 @@ Call ok(x = 2, "InStr returned " & x)
 x = InStr(2.6, "abcd", "bc")
 Call ok(x = 0, "InStr returned " & x)
 
+
+x = InStrRev("bcabcd", "bc")
+Call ok(x = 4, "InStrRev returned " & x)
+Call ok(getVT(x) = "VT_I4*", "getVT(InStrRev) returned " & getVT(x))
+
+x = InStrRev("bcabcd", "bc", 6)
+Call ok(x = 4, "InStrRev returned " & x)
+
+x = InStrRev("abcd", "bcx")
+Call ok(x = 0, "InStrRev returned " & x)
+
+x = InStrRev("abcd", "bc", 3)
+Call ok(x = 2, "InStrRev returned " & x)
+
+x = InStrRev("abcd", "bc", 2)
+Call ok(x = 0, "InStrRev returned " & x)
+
+x = InStrRev("abcd", "b", 2)
+Call ok(x = 2, "InStrRev returned " & x)
+
+x = InStrRev("abcd", "bc", 5)
+Call ok(x = 0, "InStrRev returned " & x)
+
+x = InStrRev("abcd", "bc", 15)
+Call ok(x = 0, "InStrRev returned " & x)
+
+x = "abcd"
+x = InStrRev(x, "bc")
+Call ok(x = 2, "InStrRev returned " & x)
+
+x = InStrRev("abcd", "bc", 1.3)
+Call ok(x = 0, "InStrRev returned " & x)
+
+x = InStrRev("abcd", "bc", 2.3)
+Call ok(x = 0, "InStrRev returned " & x)
+
+x = InStrRev("abcd", "bc", 2.6)
+Call ok(x = 2, "InStrRev returned " & x)
+
+x = InStrRev("1234", 34)
+Call ok(x = 3, "InStrRev returned " & x)
+
+x = InStrRev(1234, 34)
+Call ok(x = 3, "InStrRev returned " & x)
+
+Sub testInStrRevError(arg1, arg2, arg3, error_num)
+    on error resume next
+    Dim x
+
+    Call Err.clear()
+    x = InStrRev(arg1, arg2, arg3)
+    Call ok(Err.number = error_num, "Err.number = " & Err.number)
+End Sub
+
+call testInStrRevError("abcd", null, 2, 94)
+call testInStrRevError(null, "abcd", 2, 94)
+call testInStrRevError("abcd", "abcd", null, 94)
+
 Sub TestMid(str, start, len, ex)
     x = Mid(str, start, len)
     Call ok(x = ex, "Mid(" & str & ", " & start & ", " & len & ") = " & x & " expected " & ex)