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138 lines
3.8 KiB
138 lines
3.8 KiB
/*** helpcell.c - HelpGetCells routine.
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*
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* Copyright <C> 1988, Microsoft Corporation
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*
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* Purpose:
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*
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* Revision History:
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*
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* 25-Jan-1990 ln locate -> hlp_locate
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* [] 04-Aug-1988 LN Created...split from helpif.c. Added auto-fill.
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*
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*************************************************************************/
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#include <stdio.h>
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#if defined (OS2)
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#else
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#include <windows.h>
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#endif
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#include "help.h"
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#include "helpfile.h"
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#include "helpsys.h"
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/************************************************************************
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**
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** Foward Declarations
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*/
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uchar near pascal toupr(uchar);
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/************************************************************************
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**
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** HelpGetCells - Return a string of character / attribute pairs from helpfile
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**
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** Purpose:
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** Interpret the help files stored format and return a line at a time of
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** character & attribute information.
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**
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** Entry:
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** ln = 1 based line number to return
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** cbMax = Max number of characters to transfer
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** pbDst = pointer to destination
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** pbTopic = pointer to topic text
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** prgAttr = pointer to array of character attributes
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**
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** Exit:
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** returns number of bytes transfered, or -1 if that line does not exist.
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** DOES blank fill to the cbMax width.
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**
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** Exceptions:
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**
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*/
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int far pascal LOADDS HelpGetCells(ln,cbMax,pbDst,pbTopic,prgAttr)
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int ln;
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int cbMax;
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char far *pbDst;
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PB pbTopic;
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uchar far *prgAttr;
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{
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ushort cbAttr; /* length of current attribute */
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ushort cbAttrCur = 0; /* length of current attribute */
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ushort cbSrc; /* count of source characters */
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uchar cAttrCur; /* current attribute */
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uchar iAttrCur; /* index to current attribute */
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uchar far *pTopic; /* pointer to topic */
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uchar far *pchSrc; /* pointer to source characters */
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topichdr far *pHdr; /* pointer to topic header */
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pTopic = PBLOCK (pbTopic);
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pHdr = (topichdr far *)pTopic;
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if ((pTopic = hlp_locate((ushort)ln,pTopic)) == NULL)/* locate line */
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ln = -1;
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else if (pHdr->ftype & FTCOMPRESSED) {
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ln=0;
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pchSrc = pTopic; /* point to character data */
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pTopic += (*pTopic); /* point to attribute data */
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cbAttr = *((ushort far UNALIGNED *)pTopic)++ - (ushort)sizeof(ushort);/* count of attribute bytes */
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cbSrc = (ushort)((*pchSrc++) -1); /* get count of characters */
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while (cbSrc-- && cbMax--) { /* while characters to get */
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/*
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* Time for a new attribute. If there are attributes left (cbAttr > 0) then
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* just get the next one (length & index). If there weren't any left, or the
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* last one had an index of 0xff (indicating end), then we'll use the index
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* zero attribute byte, else pick up the current attribute byte and move on
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* in the attribute string.
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*/
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if (cbAttrCur == 0) {
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if (cbAttr > 0) {
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cbAttrCur = ((intlineattr far UNALIGNED *)pTopic)->cb;
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iAttrCur = ((intlineattr far UNALIGNED *)pTopic)->attr;
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}
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if ((cbAttr <= 0) || (iAttrCur == 0xff))
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cAttrCur = prgAttr[0];
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else {
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cAttrCur = prgAttr[iAttrCur];
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((intlineattr far *)pTopic)++;
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cbAttr -= 2;
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}
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}
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*((ushort far UNALIGNED *)pbDst)++ = (ushort)((cAttrCur << 8) | *pchSrc++); /* stuff char & attr*/
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cbAttrCur--;
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ln += 2;
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}
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}
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#if ASCII
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else {
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/*
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** For ascii files, just copy line over with attr[0]
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*/
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ln=0;
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while (*pTopic && (*pTopic != '\r') && cbMax--) {
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if (*pTopic == '\t') {
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pTopic++;
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do {
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*((ushort far UNALIGNED *)pbDst)++ = (ushort)((prgAttr[0] << 8) | ' ');
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ln += 2;
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}
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while ((ln % 16) && cbMax--);
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}
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else {
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*((ushort far UNALIGNED *)pbDst)++ = (ushort)((prgAttr[0] << 8) | *pTopic++);
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ln += 2;
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}
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}
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}
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#endif
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#if 0
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/*
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* blank fill the rest of the line
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*/
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while (cbMax--)
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*((ushort far UNALIGNED *)pbDst)++ = (prgAttr[0] << 8) | ' '; /* stuff char & attr*/
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#endif
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PBUNLOCK (pbTopic);
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return ln;
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/* end HelpGetCells */}
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