From b29ffcd79c545dd23c475e353696651e6620cad1 Mon Sep 17 00:00:00 2001 From: "Enrico Weigelt, metux IT consult" Date: Fri, 12 Jul 2024 14:52:51 +0200 Subject: [PATCH] (!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 --- xfixes/cursor.c | 145 ++++++++++++++++++++++---------------------- xfixes/disconnect.c | 9 ++- xfixes/region.c | 44 +++++++------- 3 files changed, 98 insertions(+), 100 deletions(-) diff --git a/xfixes/cursor.c b/xfixes/cursor.c index 3d4c3381b..4bb6a2969 100644 --- a/xfixes/cursor.c +++ b/xfixes/cursor.c @@ -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; } diff --git a/xfixes/disconnect.c b/xfixes/disconnect.c index 173908d80..cc2b7c913 100644 --- a/xfixes/disconnect.c +++ b/xfixes/disconnect.c @@ -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; } diff --git a/xfixes/region.c b/xfixes/region.c index d108e60b2..d0bde9a1b 100644 --- a/xfixes/region.c +++ b/xfixes/region.c @@ -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; }