140 lines
4 KiB
C
140 lines
4 KiB
C
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/**************************************************************************
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*HelpGetLine - Return a line of ascii text
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*
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* Copyright <C> 1988, Microsoft Corporation
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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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* 22-Feb-1989 ln Check correctly for end of topic while copying
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* line.
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* 22-Dec-1988 LN Removed MASM High Level Lang support (Need
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* to control segments better than that will
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* let me)
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* 08-Dec-1988 LN CSEG
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* 11-Nov-1988 ln Adjust cbMax on entry
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* 03-Nov-1988 ln Added GQ sensitivity
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* [] 22-Sep-1988 LN Created
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*
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* Notes:
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*
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* Sensitive to the following switches:
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*
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* HOFFSET - If defined, handle/offset version
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* OS2 - If defined, OS/2 protect mode version
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* DSLOAD - If defined, causes DS to be reloaded, if needed
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* ASCII - If TRUE, includes ASCII support code
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* GQ - If defined, INC BP before saving & DEC before restore
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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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#define INCL_BASE
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#include <os2.h>
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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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/**** HelpGetLine - Return a line of ascii text
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*
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* Interpret the help files stored format and return a line at a time of
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* ascii text.
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*
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* ushort far pascal LOADDS HelpGetLine (
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* ushort ln, = 1 based line number to return
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* ushort cbMax, = Max number of bytes to transfer
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* uchar far *pszDst, = pointer to destination
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* PB pbTopic = PB pointer to topic text
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*
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* Output:
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* Returns number of characters transfered, or 0 if that line does not exist.
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*
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*************************************************************************/
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USHORT pascal
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HelpGetLine (
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USHORT ln,
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USHORT cbMax,
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PUCHAR pszDst,
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PB pbTopic
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) {
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struct topichdr *pT;
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USHORT cbTransfered = 0;
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PUCHAR pszDstOrg = pszDst;
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cbMax--; //adjust to account for terminating zero
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pT = PBLOCK(pbTopic);
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if (pT) {
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PCHAR pLine = hlp_locate(ln, (PCHAR)pT);
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if (pLine) {
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*pszDst = ' ';
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*(pszDst +1) = '\00'; // initialize dest.
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if (pT->ftype & FTCOMPRESSED) {
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// For compressed files, get the length of the line from the
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// first byte, and of course skip that byte. Form the
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// maximum byte count ot be transfered as the lesser of the
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// actual length of the line or caller cbMax.
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USHORT Len = (USHORT)*pLine++ - 1;
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if (Len) {
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ULONG LongLen;
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Len = (Len > cbMax) ? cbMax : Len;
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LongLen = Len/sizeof(ULONG);
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Len = (USHORT)(Len % sizeof(ULONG));
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while (LongLen--) {
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*((ULONG UNALIGNED*)pszDst)++ = *((ULONG UNALIGNED *)pLine)++;
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}
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while (Len--) {
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*pszDst++ = *pLine++;
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}
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*pszDst++ = '\00'; // Null terminate it
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cbTransfered = (USHORT)(pszDst - pszDstOrg);
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} else {
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cbTransfered = 2;
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}
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} else {
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// For non-compressed files, copy one line
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PCHAR pSrc = pLine;
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CHAR c = *pLine;
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if (c == '\n') {
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cbTransfered = 2;
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} else {
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while (c != '\00' && c != '\n') {
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c = *pszDst++ = *pLine++;
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}
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*(pszDst-1) = '\00'; // null terminate it
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cbTransfered = (USHORT)(pszDst - pszDstOrg);
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}
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}
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}
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PBUNLOCK(pbTopic);
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}
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return cbTransfered;
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}
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