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(!1614) xfixes: use stack allocation and static init for reply structs 

Canonicalize all reply structures onto stack allocation and static
initialization, like already done in most other extension. So make
the code easier to understand and allow further simplifications by
subsequent commits. Also gaining a little bit efficiency by skipping
some heap allocations.

Dynamically sized buffers (where the upper bound isn't known), are
still allocated on heap.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
This commit is contained in:
Enrico Weigelt, metux IT consult 2024-07-12 14:52:51 +02:00
parent 4426951b20
commit b29ffcd79c
3 changed files with 98 additions and 100 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

145
xfixes/cursor.c
View File

@ -355,9 +355,7 @@ int
ProcXFixesGetCursorImage(ClientPtr client)
{
/* REQUEST(xXFixesGetCursorImageReq); */
xXFixesGetCursorImageReply *rep;
CursorPtr pCursor;
CARD32 *image;
int npixels, width, height, rc, x, y;
REQUEST_SIZE_MATCH(xXFixesGetCursorImageReq);
@ -372,39 +370,41 @@ ProcXFixesGetCursorImage(ClientPtr client)
width = pCursor->bits->width;
height = pCursor->bits->height;
npixels = width * height;
rep = calloc(1,
sizeof(xXFixesGetCursorImageReply) + npixels * sizeof(CARD32));
if (!rep)
CARD32 *image = calloc(npixels, sizeof(CARD32));
if (!image)
return BadAlloc;
rep->type = X_Reply;
rep->sequenceNumber = client->sequence;
rep->length = npixels;
rep->width = width;
rep->height = height;
rep->x = x;
rep->y = y;
rep->xhot = pCursor->bits->xhot;
rep->yhot = pCursor->bits->yhot;
rep->cursorSerial = pCursor->serialNumber;
image = (CARD32 *) (rep + 1);
CopyCursorToImage(pCursor, image);
xXFixesGetCursorImageReply rep = {
.type = X_Reply,
.sequenceNumber = client->sequence,
.length = npixels,
.width = width,
.height = height,
.x = x,
.y = y,
.xhot = pCursor->bits->xhot,
.yhot = pCursor->bits->yhot,
.cursorSerial = pCursor->serialNumber,
};
if (client->swapped) {
swaps(&rep->sequenceNumber);
swapl(&rep->length);
swaps(&rep->x);
swaps(&rep->y);
swaps(&rep->width);
swaps(&rep->height);
swaps(&rep->xhot);
swaps(&rep->yhot);
swapl(&rep->cursorSerial);
swaps(&rep.sequenceNumber);
swapl(&rep.length);
swaps(&rep.x);
swaps(&rep.y);
swaps(&rep.width);
swaps(&rep.height);
swaps(&rep.xhot);
swaps(&rep.yhot);
swapl(&rep.cursorSerial);
SwapLongs(image, npixels);
}
WriteToClient(client,
sizeof(xXFixesGetCursorImageReply) + (npixels << 2), rep);
free(rep);
WriteToClient(client, sizeof(xXFixesGetCursorImageReply), &rep);
WriteToClient(client, npixels * sizeof(CARD32), image);
free(image);
return Success;
}
@ -448,10 +448,9 @@ SProcXFixesSetCursorName(ClientPtr client)
int
ProcXFixesGetCursorName(ClientPtr client)
{
CursorPtr pCursor;
xXFixesGetCursorNameReply reply;
REQUEST(xXFixesGetCursorNameReq);
CursorPtr pCursor;
const char *str;
int len;
@ -463,7 +462,7 @@ ProcXFixesGetCursorName(ClientPtr client)
str = "";
len = strlen(str);
reply = (xXFixesGetCursorNameReply) {
xXFixesGetCursorNameReply rep = {
.type = X_Reply,
.sequenceNumber = client->sequence,
.length = bytes_to_int32(len),
@ -471,12 +470,12 @@ ProcXFixesGetCursorName(ClientPtr client)
.nbytes = len
};
if (client->swapped) {
swaps(&reply.sequenceNumber);
swapl(&reply.length);
swapl(&reply.atom);
swaps(&reply.nbytes);
swaps(&rep.sequenceNumber);
swapl(&rep.length);
swapl(&rep.atom);
swaps(&rep.nbytes);
}
WriteReplyToClient(client, sizeof(xXFixesGetCursorNameReply), &reply);
WriteReplyToClient(client, sizeof(xXFixesGetCursorNameReply), &rep);
WriteToClient(client, len, str);
return Success;
@ -495,12 +494,10 @@ int
ProcXFixesGetCursorImageAndName(ClientPtr client)
{
/* REQUEST(xXFixesGetCursorImageAndNameReq); */
xXFixesGetCursorImageAndNameReply *rep;
CursorPtr pCursor;
CARD32 *image;
int npixels;
const char *name;
int nbytes, nbytesRound;
int nbytes;
int width, height;
int rc, x, y;
@ -518,45 +515,47 @@ ProcXFixesGetCursorImageAndName(ClientPtr client)
npixels = width * height;
name = pCursor->name ? NameForAtom(pCursor->name) : "";
nbytes = strlen(name);
nbytesRound = pad_to_int32(nbytes);
rep = calloc(1, sizeof(xXFixesGetCursorImageAndNameReply) +
npixels * sizeof(CARD32) + nbytesRound);
if (!rep)
// pixmap plus name (padded to 4 bytes)
CARD32 *image = calloc(npixels + bytes_to_int32(nbytes), sizeof(CARD32));
if (!image)
return BadAlloc;
rep->type = X_Reply;
rep->sequenceNumber = client->sequence;
rep->length = npixels + bytes_to_int32(nbytesRound);
rep->width = width;
rep->height = height;
rep->x = x;
rep->y = y;
rep->xhot = pCursor->bits->xhot;
rep->yhot = pCursor->bits->yhot;
rep->cursorSerial = pCursor->serialNumber;
rep->cursorName = pCursor->name;
rep->nbytes = nbytes;
image = (CARD32 *) (rep + 1);
CopyCursorToImage(pCursor, image);
memcpy((image + npixels), name, nbytes);
xXFixesGetCursorImageAndNameReply rep = {
.type = X_Reply,
.sequenceNumber = client->sequence,
.length = bytes_to_int32(sizeof(image)),
.width = width,
.height = height,
.x = x,
.y = y,
.xhot = pCursor->bits->xhot,
.yhot = pCursor->bits->yhot,
.cursorSerial = pCursor->serialNumber,
.cursorName = pCursor->name,
.nbytes = nbytes,
};
if (client->swapped) {
swaps(&rep->sequenceNumber);
swapl(&rep->length);
swaps(&rep->x);
swaps(&rep->y);
swaps(&rep->width);
swaps(&rep->height);
swaps(&rep->xhot);
swaps(&rep->yhot);
swapl(&rep->cursorSerial);
swapl(&rep->cursorName);
swaps(&rep->nbytes);
swaps(&rep.sequenceNumber);
swapl(&rep.length);
swaps(&rep.x);
swaps(&rep.y);
swaps(&rep.width);
swaps(&rep.height);
swaps(&rep.xhot);
swaps(&rep.yhot);
swapl(&rep.cursorSerial);
swapl(&rep.cursorName);
swaps(&rep.nbytes);
SwapLongs(image, npixels);
}
WriteToClient(client, sizeof(xXFixesGetCursorImageAndNameReply) +
(npixels << 2) + nbytesRound, rep);
free(rep);
WriteToClient(client, sizeof(xXFixesGetCursorImageAndNameReply), &rep);
WriteToClient(client, sizeof(image), image);
free(image);
return Success;
}

9
xfixes/disconnect.c
View File

@ -87,21 +87,20 @@ int
ProcXFixesGetClientDisconnectMode(ClientPtr client)
{
ClientDisconnectPtr pDisconnect = GetClientDisconnect(client);
xXFixesGetClientDisconnectModeReply reply;
REQUEST_SIZE_MATCH(xXFixesGetClientDisconnectModeReq);
reply = (xXFixesGetClientDisconnectModeReply) {
xXFixesGetClientDisconnectModeReply rep = {
.type = X_Reply,
.sequenceNumber = client->sequence,
.length = 0,
.disconnect_mode = pDisconnect->disconnect_mode,
};
if (client->swapped) {
swaps(&reply.sequenceNumber);
swapl(&reply.disconnect_mode);
swaps(&rep.sequenceNumber);
swapl(&rep.disconnect_mode);
}
WriteToClient(client, sizeof(xXFixesGetClientDisconnectModeReply), &reply);
WriteToClient(client, sizeof(xXFixesGetClientDisconnectModeReply), &rep);
return Success;
}

44
xfixes/region.c
View File

@ -507,8 +507,6 @@ int
ProcXFixesFetchRegion(ClientPtr client)
{
RegionPtr pRegion;
xXFixesFetchRegionReply *reply;
xRectangle *pRect;
BoxPtr pExtent;
BoxPtr pBox;
int i, nBox;
@ -522,37 +520,39 @@ ProcXFixesFetchRegion(ClientPtr client)
pBox = RegionRects(pRegion);
nBox = RegionNumRects(pRegion);
reply = calloc(sizeof(xXFixesFetchRegionReply) + nBox * sizeof(xRectangle),
1);
if (!reply)
xRectangle *pRect = calloc(nBox, sizeof(xRectangle));
if (!pRect)
return BadAlloc;
reply->type = X_Reply;
reply->sequenceNumber = client->sequence;
reply->length = nBox << 1;
reply->x = pExtent->x1;
reply->y = pExtent->y1;
reply->width = pExtent->x2 - pExtent->x1;
reply->height = pExtent->y2 - pExtent->y1;
pRect = (xRectangle *) (reply + 1);
for (i = 0; i < nBox; i++) {
pRect[i].x = pBox[i].x1;
pRect[i].y = pBox[i].y1;
pRect[i].width = pBox[i].x2 - pBox[i].x1;
pRect[i].height = pBox[i].y2 - pBox[i].y1;
}
xXFixesFetchRegionReply rep = {
.type = X_Reply,
.sequenceNumber = client->sequence,
.length = nBox << 1,
.x = pExtent->x1,
.y = pExtent->y1,
.width = pExtent->x2 - pExtent->x1,
.height = pExtent->y2 - pExtent->y1,
};
if (client->swapped) {
swaps(&reply->sequenceNumber);
swapl(&reply->length);
swaps(&reply->x);
swaps(&reply->y);
swaps(&reply->width);
swaps(&reply->height);
swaps(&rep.sequenceNumber);
swapl(&rep.length);
swaps(&rep.x);
swaps(&rep.y);
swaps(&rep.width);
swaps(&rep.height);
SwapShorts((INT16 *) pRect, nBox * 4);
}
WriteToClient(client, sizeof(xXFixesFetchRegionReply) +
nBox * sizeof(xRectangle), (char *) reply);
free(reply);
WriteToClient(client, sizeof(xXFixesFetchRegionReply), &rep);
WriteToClient(client, sizeof(pRect), pRect);
free(pRect);
return Success;
}