From: Carlos Rivera <carlos@superkaos.org>
Subject: [PATCH v2 1/2] kernel32/tests: Add new test for passing NULL filename argument.
Message-Id: <20200905201123.280620-1-carlos@superkaos.org>
Date: Sat,  5 Sep 2020 22:11:22 +0200

In Windows, when invoked with filename = NULL, these functions:

WritePrivateProfileStringW,
WritePrivateProfileSectionW,
GetPrivateProfileSectionNamesW,
GetPrivateProfileStringW

Behave as if filename is "win.ini". Then if a map to "win.ini" (and the section if applicable) exists
in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\IniFileMapping it gets used.

Since in a freshly installed Wine and Windows a map to "win.ini" exists this test only verifies
that default mapping behavior. It does not verify actual writting/reading to C:\windows\win.ini.

Signed-off-by: Carlos Rivera <carlos@superkaos.org>
---
v2: fixed broken tests, fixed the wording of the commit.
 dlls/kernel32/tests/profile.c | 93 +++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)

diff --git a/dlls/kernel32/tests/profile.c b/dlls/kernel32/tests/profile.c
index f981558548..b7d239043b 100644
--- a/dlls/kernel32/tests/profile.c
+++ b/dlls/kernel32/tests/profile.c
@@ -1588,6 +1588,98 @@ static void test_registry_mapping(void)
     ok(ret, "got error %u\n", GetLastError());
 }
 
+static void test_null_filename(void)
+{
+    /* Some profile functions assume filename is win.ini if filename is passed as NULL
+       then if a map for win.ini exists in IniFileMapping they use it */
+
+    HKEY mapping_key, mapped_key;
+    char buffer[1024];
+    char* p;
+    int found = 0;
+    LSTATUS ret;
+
+    if (GetFileAttributesA("C:/windows/win.ini") != INVALID_FILE_ATTRIBUTES)
+    {
+        ret = MoveFileA("C:/windows/win.ini", "C:/windows/winini.bak");
+
+        if (!ret)
+        {
+            skip("Failed to move C:/windows/win.ini out of the way to prevent possibly destructive tests.\n");
+            return;
+        }
+    }
+
+    ret = RegOpenKeyExA(HKEY_LOCAL_MACHINE,
+                        "Software\\Microsoft\\Windows NT\\CurrentVersion\\IniFileMapping\\win.ini",
+                        0, KEY_READ | KEY_WRITE | KEY_WOW64_64KEY, &mapping_key);
+
+    if (ret)
+    {
+        skip("Failed to find a win.ini IniFileMapping registry entry\n");
+        return;
+    }
+
+    ret = RegSetValueExA(mapping_key, "section1", 0, REG_SZ, (BYTE *)"USR:section1_map", sizeof("USR:section1_map"));
+    ok(!ret, "got error %u\n", ret);
+    ret = WritePrivateProfileStringA(NULL, NULL, NULL, "win.ini");
+    todo_wine ok(ret, "got error %u\n", GetLastError());
+
+    ret = WritePrivateProfileStringA("section1", "name1", "42", NULL);
+    ok(ret, "got error %u\n", ret);
+
+    ret = DeleteFileA("C:/windows/win.ini");
+    ok(!ret, "expected failure\n");
+
+    ret = RegOpenKeyExA(HKEY_CURRENT_USER, "section1_map", 0, KEY_READ | KEY_WRITE, &mapped_key);
+    check_registry_value(mapped_key, "name1", "42");
+
+    check_profile_string("section1", "name1", NULL, "42");
+
+    memset(buffer, 0xc, sizeof(buffer));
+    ret = GetPrivateProfileSectionNamesA(buffer, sizeof(buffer), NULL);
+    ok(ret, "got error %u\n", ret);
+
+    if (ret)
+    {
+        p = buffer;
+        while (p < (buffer + sizeof(buffer) - 1))
+        {
+            int len = sizeof(buffer) - (p - buffer);
+
+            if (!strncmp("section1", p, len))
+            {
+                found = 1;
+                break;
+            }
+            while (*p++ && p < (buffer + sizeof(buffer) - 1));
+        }
+    }
+
+    ok(found,
+       "Expected \"section1\" in buffer, but buffer is %s\n",
+       debugstr_an(buffer, (ret + 2 >= sizeof(buffer) ? sizeof(buffer) : ret + 1)));
+
+    ret = WritePrivateProfileSectionA("section1", "name2=mango\0", NULL);
+    ok(ret, "got error %u\n", ret);
+
+    check_registry_value(mapped_key, "name2", "mango");
+
+    ret = DeleteFileA("C:/windows/win.ini");
+    ok(!ret, "expected failure\n");
+
+    MoveFileA("C:/windows/winini.bak", "C:/windows/win.ini");
+
+    ret = RegDeleteValueA(mapping_key, "section1");
+    ok(!ret, "got error %u\n", ret);
+
+    ret = RegDeleteKeyA(HKEY_CURRENT_USER, "section1_map");
+    ok(!ret, "got error %u\n", ret);
+
+    RegCloseKey(mapped_key);
+    RegCloseKey(mapping_key);
+};
+
 START_TEST(profile)
 {
     test_profile_int();
@@ -1617,4 +1709,5 @@ START_TEST(profile)
     test_WritePrivateProfileString();
     test_profile_struct();
     test_registry_mapping();
+    test_null_filename();
 }

-- 
2.28.0