[PATCH v6 0/2] MR3854: winmm: Avoid use of hardcoded return values.

[Alistair Leslie-Hughes (＠alesliehughes)]

Based on patch by Michael Müller.

--
  v6: winmm: MCI_MapMsgAtoW return error code directly instead of a tri-value.
      winmm: Always call MCI_UnmapMsgAtoW in mciSendCommandA.

https://gitlab.winehq.org/wine/wine/-/merge_requests/3854

[PATCH v6 1/2] winmm: Always call MCI_UnmapMsgAtoW in mciSendCommandA.

[Alistair Leslie-Hughes]

From: Alistair Leslie-Hughes

MCI_UnmapMsgAtoW handles all cases where MCI_MapMsgAtoW allocates memory.
---
 dlls/winmm/mci.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/dlls/winmm/mci.c b/dlls/winmm/mci.c
index 959801aa835..30a2eda20c7 100644
--- a/dlls/winmm/mci.c
+++ b/dlls/winmm/mci.c
@@ -501,7 +501,6 @@ static void MCI_UnmapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR dwParam2,
         break;

default:
-        FIXME("Message %s needs unmapping\n", MCI_MessageToString(msg));
         break;
     }
 }
@@ -2294,8 +2293,8 @@ DWORD WINAPI mciSendCommandA(MCIDEVICEID wDevID, UINT wMsg, DWORD_PTR dwParam1,
         return MCIERR_OUT_OF_MEMORY;
     }
     ret = mciSendCommandW(wDevID, wMsg, dwParam1, dwParam2);
-    if (mapped)
-        MCI_UnmapMsgAtoW(wMsg, dwParam1, dwParam2, ret);
+
+    MCI_UnmapMsgAtoW(wMsg, dwParam1, dwParam2, ret);
     return ret;
 }

[PATCH v6 1/2] winmm: Always call MCI_UnmapMsgAtoW in mciSendCommandA.

[Dmitry Timoshkov]

Alistair Leslie-Hughes  wrote:
> @@ -2294,8 +2293,8 @@ DWORD WINAPI mciSendCommandA(MCIDEVICEID wDevID, UINT wMsg, DWORD_PTR dwParam1,
>          return MCIERR_OUT_OF_MEMORY;
>      }
>      ret = mciSendCommandW(wDevID, wMsg, dwParam1, dwParam2);
> - if (mapped)
> -
>    MCI_UnmapMsgAtoW(wMsg, dwParam1, dwParam2, ret);
> -
> - MCI_UnmapMsgAtoW(wMsg, dwParam1, dwParam2, ret);
> return ret;
>
> }

Probably use of an intermediate local variable 'mapped' could be also eliminated.

[PATCH v6 2/2] winmm: MCI_MapMsgAtoW return error code directly instead of a tri-value.

[Alistair Leslie-Hughes]

From: Alistair Leslie-Hughes

Based on patch by Michael Müller.
---
 dlls/winmm/mci.c | 35 +++++++++++++++--------------------
 1 file changed, 15 insertions(+), 20 deletions(-)

diff --git a/dlls/winmm/mci.c b/dlls/winmm/mci.c
index 30a2eda20c7..2048dd65a50 100644
--- a/dlls/winmm/mci.c
+++ b/dlls/winmm/mci.c
@@ -204,7 +204,7 @@ static LPWSTR MCI_strdupAtoW( LPCSTR str )
     return ret;
 }

-static int MCI_MapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR *dwParam2)
+static DWORD MCI_MapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR *dwParam2)
 {
     if (msg < DRV_RESERVED) return 0;

@@ -248,7 +248,7 @@ static int MCI_MapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR *dwParam2)
             DWORD_PTR *ptr;

ptr = malloc(sizeof(DWORD_PTR) + sizeof(*mci_openW));
-            if (!ptr) return -1;
+            if (!ptr) return MCIERR_OUT_OF_MEMORY;

*ptr++ = *dwParam2; /* save the previous pointer */
             *dwParam2 = (DWORD_PTR)ptr;
@@ -278,7 +278,7 @@ static int MCI_MapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR *dwParam2)
             if (HIWORD(dwParam1))
                 memcpy(&mci_openW->dwStyle, &mci_openA->dwStyle, sizeof(MCI_ANIM_OPEN_PARMSW) - sizeof(MCI_OPEN_PARMSW));
         }
-        return 1;
+        return 0;

case MCI_WINDOW:
         if (dwParam1 & MCI_ANIM_WINDOW_TEXT)
@@ -287,7 +287,7 @@ static int MCI_MapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR *dwParam2)
             MCI_ANIM_WINDOW_PARMSW *mci_windowW;

mci_windowW = malloc(sizeof(*mci_windowW));
-            if (!mci_windowW) return -1;
+            if (!mci_windowW) return MCIERR_OUT_OF_MEMORY;

*dwParam2 = (DWORD_PTR)mci_windowW;

@@ -299,8 +299,6 @@ static int MCI_MapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR *dwParam2)
                 mci_windowW->hWnd = mci_windowA->hWnd;
             if (dwParam1 & MCI_ANIM_WINDOW_STATE)
                 mci_windowW->nCmdShow = mci_windowA->nCmdShow;
-
-            return 1;
         }
         return 0;

@@ -312,7 +310,7 @@ static int MCI_MapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR *dwParam2)
             DWORD_PTR *ptr;

ptr = malloc(sizeof(*mci_sysinfoW) + sizeof(DWORD_PTR));
-            if (!ptr) return -1;
+            if (!ptr) return MCIERR_OUT_OF_MEMORY;

*ptr++ = *dwParam2; /* save the previous pointer */
             *dwParam2 = (DWORD_PTR)ptr;
@@ -326,7 +324,6 @@ static int MCI_MapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR *dwParam2)
             mci_sysinfoW->lpstrReturn = malloc(mci_sysinfoW->dwRetSize * sizeof(WCHAR));
             mci_sysinfoW->dwNumber = mci_sysinfoA->dwNumber;
             mci_sysinfoW->wDeviceType = mci_sysinfoA->wDeviceType;
-            return 1;
         }
         return 0;
     case MCI_INFO:
@@ -336,7 +333,7 @@ static int MCI_MapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR *dwParam2)
             DWORD_PTR *ptr;

ptr = malloc(sizeof(*mci_infoW) + sizeof(DWORD_PTR));
-            if (!ptr) return -1;
+            if (!ptr) return MCIERR_OUT_OF_MEMORY;

*ptr++ = *dwParam2; /* save the previous pointer */
             *dwParam2 = (DWORD_PTR)ptr;
@@ -350,8 +347,8 @@ static int MCI_MapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR *dwParam2)
             mci_infoW->lpstrReturn = malloc(mci_infoW->dwRetSize * sizeof(WCHAR));
             if (dwParam1 & MCI_DGV_INFO_ITEM)
                 mci_infoW->dwItem = mci_infoA->dwItem;
-            return 1;
         }
+        return 0;
     case MCI_SAVE:
     case MCI_LOAD:
     case MCI_CAPTURE:
@@ -361,7 +358,7 @@ static int MCI_MapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR *dwParam2)
             MCI_OVLY_LOAD_PARMSW *mci_loadW;

mci_loadW = malloc(sizeof(*mci_loadW));
-            if (!mci_loadW) return -1;
+            if (!mci_loadW) return MCIERR_OUT_OF_MEMORY;

*dwParam2 = (DWORD_PTR)mci_loadW;
             if (dwParam1 & MCI_NOTIFY)
@@ -372,8 +369,8 @@ static int MCI_MapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR *dwParam2)
                 (MCI_CAPTURE == msg && dwParam1 & MCI_DGV_CAPTURE_AT) ||
                 (MCI_RESTORE == msg && dwParam1 & MCI_DGV_RESTORE_AT))
                 mci_loadW->rc = mci_loadA->rc;
-            return 1;
         }
+        return 0;
     case MCI_SOUND:
     case MCI_ESCAPE:
         {   /* All these commands have the same layout: callback + string */
@@ -381,14 +378,14 @@ static int MCI_MapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR *dwParam2)
             MCI_VD_ESCAPE_PARMSW *mci_vd_escapeW;

mci_vd_escapeW = malloc(sizeof(*mci_vd_escapeW));
-            if (!mci_vd_escapeW) return -1;
+            if (!mci_vd_escapeW) return MCIERR_OUT_OF_MEMORY;

*dwParam2 = (DWORD_PTR)mci_vd_escapeW;
             if (dwParam1 & MCI_NOTIFY)
                 mci_vd_escapeW->dwCallback = mci_vd_escapeA->dwCallback;
             mci_vd_escapeW->lpstrCommand = MCI_strdupAtoW(mci_vd_escapeA->lpstrCommand);
-            return 1;
         }
+        return 0;
     case MCI_SETAUDIO:
     case MCI_SETVIDEO:
         if (!(dwParam1 & (MCI_DGV_SETVIDEO_QUALITY | MCI_DGV_SETVIDEO_ALG
@@ -2281,16 +2278,14 @@ DWORD WINAPI mciSendCommandW(MCIDEVICEID wDevID, UINT wMsg, DWORD_PTR dwParam1,
 DWORD WINAPI mciSendCommandA(MCIDEVICEID wDevID, UINT wMsg, DWORD_PTR dwParam1, DWORD_PTR dwParam2)
 {
     DWORD ret;
-    int mapped;

-    TRACE("(%08x, %s, %08Ix, %08Ix)\n",
-	  wDevID, MCI_MessageToString(wMsg), dwParam1, dwParam2);
+    TRACE("(%08x, %s, %08Ix, %08Ix)\n", wDevID, MCI_MessageToString(wMsg), dwParam1, dwParam2);

-    mapped = MCI_MapMsgAtoW(wMsg, dwParam1, &dwParam2);
-    if (mapped == -1)
+    ret = MCI_MapMsgAtoW(wMsg, dwParam1, &dwParam2);
+    if (ret)
     {
         FIXME("message %04x mapping failed\n", wMsg);
-        return MCIERR_OUT_OF_MEMORY;
+        return ret;
     }
     ret = mciSendCommandW(wDevID, wMsg, dwParam1, dwParam2);