153 lines
4.1 KiB
C
153 lines
4.1 KiB
C
/****************************** Module Header ******************************\
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* Module Name: util.c
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* Copyright (c) 1985 - 1999, Microsoft Corporation
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* DDE Manager general utility functions
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* Created: 11/3/91 Sanford Staab
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*/
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#include "precomp.h"
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#pragma hdrstop
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/*
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* AddLink
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* Description:
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* Adds an advise link to the conversation's info.
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* History:
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* 11-19-91 sanfords Created.
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*/
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BOOL AddLink(
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PCONV_INFO pcoi,
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GATOM gaItem,
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WORD wFmt,
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WORD wType)
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{
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PADVISE_LINK aLinkNew;
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int cLinks;
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LATOM la;
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PCL_INSTANCE_INFO pcii;
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/*
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* if the link already exists, update its flags, otherwise create a
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* new one.
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*/
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aLinkNew = pcoi->aLinks;
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cLinks = pcoi->cLinks;
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la = GlobalToLocalAtom(gaItem); // aLinkNew copy
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while (cLinks) {
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if (aLinkNew->laItem == la && aLinkNew->wFmt == wFmt) {
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aLinkNew->wType = wType;
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aLinkNew->state = 0;
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DeleteAtom(la);
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return TRUE;
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}
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aLinkNew++;
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cLinks--;
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}
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if (pcoi->aLinks == NULL) {
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aLinkNew = (PADVISE_LINK)DDEMLAlloc(sizeof(ADVISE_LINK));
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} else {
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aLinkNew = (PADVISE_LINK)DDEMLReAlloc(pcoi->aLinks,
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sizeof(ADVISE_LINK) * (pcoi->cLinks + 1));
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}
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if (aLinkNew == NULL) {
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SetLastDDEMLError(pcoi->pcii, DMLERR_MEMORY_ERROR);
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DeleteAtom(la);
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return FALSE;
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}
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pcoi->aLinks = aLinkNew;
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aLinkNew += pcoi->cLinks;
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pcoi->cLinks++;
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aLinkNew->laItem = la;
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aLinkNew->wFmt = wFmt;
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aLinkNew->wType = wType;
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aLinkNew->state = 0;
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if (!(pcoi->state & ST_CLIENT)) {
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/*
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* Add count for this link
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*/
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pcii = pcoi->pcii;
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for (aLinkNew->pLinkCount = pcii->pLinkCount;
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aLinkNew->pLinkCount;
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aLinkNew->pLinkCount = aLinkNew->pLinkCount->next) {
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if (aLinkNew->pLinkCount->laTopic == pcoi->laTopic &&
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aLinkNew->pLinkCount->gaItem == gaItem &&
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aLinkNew->pLinkCount->wFmt == wFmt) {
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aLinkNew->pLinkCount->Total++;
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return(TRUE);
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}
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}
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/*
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* Not found - add an entry
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*/
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aLinkNew->pLinkCount = (PLINK_COUNT)DDEMLAlloc(sizeof(LINK_COUNT));
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if (aLinkNew->pLinkCount == NULL) {
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SetLastDDEMLError(pcoi->pcii, DMLERR_MEMORY_ERROR);
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return FALSE;
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}
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aLinkNew->pLinkCount->next = pcii->pLinkCount;
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pcii->pLinkCount = aLinkNew->pLinkCount;
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aLinkNew->pLinkCount->laTopic = IncLocalAtomCount(pcoi->laTopic); // LinkCount copy
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aLinkNew->pLinkCount->gaItem = IncGlobalAtomCount(gaItem); // LinkCount copy
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aLinkNew->pLinkCount->laItem = IncLocalAtomCount(la); // LinkCount copy
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aLinkNew->pLinkCount->wFmt = wFmt;
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aLinkNew->pLinkCount->Total = 1;
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// doesn't matter: aLinkNew->pLinkCount->Count = 0;
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}
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return TRUE;
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}
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/*
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* The LinkCount array is a list of all active links grouped by topic
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* and item. The Total field is the number of active links total for
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* that particular topic/item pair for the entire instance. The count
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* field is used to properly set up the links to go field of the XTYP_ADVREQ
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* callback. Whenever links are added or removed, DeleteLinkCount or
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* AddLink need to be called to keep thses counts correct.
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*/
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VOID DeleteLinkCount(
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PCL_INSTANCE_INFO pcii,
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PLINK_COUNT pLinkCountDelete)
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{
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PLINK_COUNT pLinkCount, pLinkCountPrev;
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if (--pLinkCountDelete->Total != 0) {
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return;
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}
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pLinkCountPrev = NULL;
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pLinkCount = pcii->pLinkCount;
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while (pLinkCount) {
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if (pLinkCount == pLinkCountDelete) {
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GlobalDeleteAtom(pLinkCount->gaItem);
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DeleteAtom(pLinkCount->laItem);
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DeleteAtom(pLinkCount->laTopic);
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if (pLinkCountPrev == NULL) {
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pcii->pLinkCount = pLinkCount->next;
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} else {
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pLinkCountPrev->next = pLinkCount->next;
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}
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DDEMLFree(pLinkCount);
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return;
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}
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pLinkCountPrev = pLinkCount;
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pLinkCount = pLinkCount->next;
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}
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}
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