/*********************************************************** Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts, and the Massachusetts Institute of Technology, Cambridge, Massachusetts. All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the names of Digital or MIT not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ******************************************************************/ /* $Header: extension.c,v 1.19 87/06/10 19:48:47 sue Exp $ */ #include "X.h" #define NEED←REPLIES #include "Xproto.h" #include "misc.h" #include "dixstruct.h" #include "extnsionst.h" #include "gcstruct.h" #include "scrnintstr.h" #include <strings.h> #define EXTENSION←BASE 128 #define EXTENSION←EVENT←BASE 64 #define LAST←EVENT 128 #define LAST←ERROR 0x7fffffff typedef struct ←ProcEntry { char *name; ExtensionLookupProc proc; } ProcEntryRec, *ProcEntryPtr; typedef struct ←ScreenProcEntry { int num; ProcEntryPtr procList; } ScreenProcEntry; ScreenProcEntry AuxillaryScreenProcs[MAXSCREENS]; ExtensionEntry *extensions = (ExtensionEntry *)NULL; extern int (* ProcVector[]) (); extern int (* SwappedProcVector[]) (); extern void (* ReplySwapVector[256]) (); int lastEvent = EXTENSION←EVENT←BASE; int lastError = FirstExtensionError; int NumExtensions = 0; void InitExtensions() { int i; for (i=0; i<MAXSCREENS; i++) AuxillaryScreenProcs[i].num = 0; } ExtensionEntry *AddExtensions(name, NumEvents, NumErrors, MainProc, SwappedMainProc) char *name; int NumEvents; int NumErrors; int (* MainProc)(); int (* SwappedMainProc)(); { int i; if (! (MainProc || SwappedMainProc)) return((ExtensionEntry *) NULL); if ((lastEvent + NumEvents > LAST←EVENT) || (unsigned)(lastError + NumErrors > LAST←ERROR)) return((ExtensionEntry *) NULL); i = NumExtensions; NumExtensions += 1; extensions = (ExtensionEntry *) Xrealloc(extensions, NumExtensions * sizeof(ExtensionEntry)); extensions[i].name = (char *)Xalloc(strlen(name)); bcopy(name, extensions[i].name , strlen(name)); extensions[i].index = i; extensions[i].base = i + EXTENSION←BASE; ProcVector[i + EXTENSION←BASE] = MainProc; SwappedProcVector[i + EXTENSION←BASE] = SwappedMainProc; if (NumEvents) { extensions[i].eventBase = lastEvent; extensions[i].eventLast = lastEvent + NumEvents; lastEvent += NumEvents; } else { extensions[i].eventBase = 0; extensions[i].eventLast = 0; } if (NumErrors) { extensions[i].errorBase = lastError; extensions[i].errorLast = lastError + NumErrors; lastError += NumErrors; } else { extensions[i].errorBase = 0; extensions[i].errorLast = 0; } return(&extensions[i]); } int ProcQueryExtension(client) ClientPtr client; { xQueryExtensionReply reply; int i; REQUEST(xQueryExtensionReq); REQUEST←AT←LEAST←SIZE(xQueryExtensionReq); reply.type = X←Reply; reply.length = 0; reply.major←opcode = 0; reply.sequenceNumber = client->sequence; if ( ! NumExtensions ) reply.present = xFalse; else { for (i=0; i<NumExtensions; i++) { if (! strncmp(&stuff[1], extensions[i].name, stuff->nbytes)) break; } if (i == NumExtensions) reply.present = xFalse; else { reply.present = xTrue; reply.major←opcode = extensions[i].base; reply.first←event = extensions[i].eventBase; reply.first←error = extensions[i].errorBase; } } WriteReplyToClient(client, sizeof(xQueryExtensionReply), &reply); return(client->noClientException); } int ProcListExtensions(client) ClientPtr client; { xListExtensionsReply reply; char *bufptr, *buffer; REQUEST(xReq); REQUEST←SIZE←MATCH(xReq); reply.type = X←Reply; reply.nExtensions = NumExtensions; reply.length = 0; if ( NumExtensions ) { register int i; int len = 0; for (i=0; i<NumExtensions; i++) len += strlen(extensions[i].name) + 1; reply.length = (len + 3) >> 2; buffer = bufptr = (char *)ALLOCATE←LOCAL(len); for (i=0; i<NumExtensions; i++) { *bufptr++ = len = strlen(extensions[i].name); bcopy(extensions[i].name, bufptr, len); bufptr += len; } } WriteReplyToClient(client, sizeof(xListExtensionsReply), &reply); if (reply.length) { WriteReplyToClient(client, reply.length << 2, buffer); DEALLOCATE←LOCAL(buffer); } return(client->noClientException); } ExtensionLookupProc LookupProc(name, pGC) char *name; GCPtr pGC; { register int i; ScreenProcEntry spentry; spentry = AuxillaryScreenProcs[pGC->pScreen->myNum]; if (spentry.num) { for (i = 0; i < spentry.num; i++) if (strcmp(name, spentry.procList[i].name) == 0) return(spentry.procList[i].proc); } return (ExtensionLookupProc)NULL; } void RegisterProc(name, pGC, proc) char *name; GC *pGC; ExtensionLookupProc proc; { ScreenProcEntry spentry; ProcEntryPtr procEntry = (ProcEntryPtr)NULL; int i; spentry = AuxillaryScreenProcs[pGC->pScreen->myNum]; /* first replace duplicates */ if (spentry.num) { for (i = 0; i < spentry.num; i++) if (strcmp(name, spentry.procList[i].name) == 0) { procEntry = &spentry.procList[i]; break; } } if (procEntry) procEntry->proc = proc; else { spentry.procList = (ProcEntryPtr)Xrealloc(spentry.procList, spentry.num); procEntry = &spentry.procList[spentry.num]; procEntry->name = (char *)NULL; strcpy(name, procEntry->name); procEntry->proc = proc; spentry.num++; } }