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/* -*- c -*- ------------------------------------------------------------- *
*
* Copyright 2004-2005 Murali Krishnan Ganapathy - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
* Boston MA 02111-1307, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
#include "help.h"
#include <stdio.h>
#include "string.h"
#include "com32io.h"
#include <loadfile.h> // to read entire file into memory
char helpbasedir[HELPDIRLEN]; // name of help directory limited to HELPDIRLEN
// Find the occurence of the count'th \n in buffer (or NULL) if not found
char * findline(char*buffer,int count)
{
int ctr;
char *p= buffer-1;
if (count < 1) return buffer;
for (ctr=0; ctr < count; ctr++) {
p = strchr(p+1,'\n');
if (p==NULL) return NULL;
}
return p;
}
// return the number of lines in buffer
int countlines(char*buffer)
{
int ans;
const char *p;
p = buffer-1;
ans = 1;
while(p) {p = strchr(p+1,'\n'); ans++; }
return ans;
}
// Print numlines of text starting from buf
void printtext(char*buf, int from)
{
char *p,*f;
char right,bot,nlines;
// clear window to print
right = getnumcols() - HELP_RIGHT_MARGIN;
bot = getnumrows() - HELP_BOTTOM_MARGIN;
nlines = bot-HELP_BODY_ROW+1;
scrollupwindow(HELP_BODY_ROW,HELP_LEFT_MARGIN,bot,right,0x07,nlines);
f = findline(buf,from);
if (!f) return; // nothing to print
if (*f=='\n') f++; // start of from+1st line
p = findline(f,nlines);
if (p && (*p=='\n')) *p = '\0'; // change to NUL
gotoxy(HELP_BODY_ROW,HELP_LEFT_MARGIN,HELPPAGE);
cswprint(f,0x07,HELP_LEFT_MARGIN);
if (p) *p = '\n'; // set it back
}
void showhelp(const char *filename)
{
char nc,nr,ph;
char *title,*text;
union { char *buffer; void *vbuf; } buf; // This is to avoild type-punning issues
char line[512];
size_t size;
char scan;
int rv,numlines,curr_line;
nc = getnumcols();
nr = getnumrows();
ph = nr - HELP_BOTTOM_MARGIN - HELP_BODY_ROW - 1;
cls();
drawbox(0,0,nr,nc-1,HELPPAGE,0x07,HELPBOX);
drawhorizline(2,0,nc-1,HELPPAGE,0x07,HELPBOX,0); // dumb==0
if (filename == NULL) { // print file contents
gotoxy(HELP_BODY_ROW,HELP_LEFT_MARGIN,HELPPAGE);
cswprint("Filename not given",0x07,HELP_LEFT_MARGIN);
while (1) {
inputc(&scan);
if (scan == ESCAPE) break;
}
cls();
return;
}
rv = loadfile(filename,(void **)&buf.vbuf, &size); // load entire file into memory
if (rv < 0) { // Error reading file or no such file
sprintf(line, "Error reading file or file not found\n file=%s",filename);
gotoxy(HELP_BODY_ROW,HELP_LEFT_MARGIN,HELPPAGE);
cswprint(line,0x07,HELP_LEFT_MARGIN);
while (1) {
inputc(&scan);
if (scan == ESCAPE) break;
}
cls();
return;
}
title = buf.buffer;
text = findline(title,1); // end of first line
*text++='\0'; // end the title string and increment text
// Now we have a file just print it.
gotoxy(1,(nc-strlen(title))/2,HELPPAGE);
csprint(title,0x07);
numlines = countlines(text);
curr_line = 0;
scan = ESCAPE+1; // anything except ESCAPE
while(scan != ESCAPE) {
printtext(text,curr_line);
gotoxy(HELP_BODY_ROW-1,nc-HELP_RIGHT_MARGIN,HELPPAGE);
if (curr_line > 0)
putch(HELP_MORE_ABOVE,0x07,HELPPAGE);
else putch(' ',0x07,HELPPAGE);
gotoxy(nr-HELP_BOTTOM_MARGIN+1,nc-HELP_RIGHT_MARGIN,HELPPAGE);
if (curr_line < numlines - ph)
putch(HELP_MORE_BELOW,0x07,HELPPAGE);
else putch(' ',0x07,HELPPAGE);
inputc(&scan); // wait for user keypress
switch(scan) {
case HOMEKEY:
curr_line = 0;
break;
case ENDKEY:
curr_line = numlines;
break;
case UPARROW:
curr_line--;
break;
case DNARROW:
curr_line++;
break;
case PAGEUP:
curr_line -= ph;
break;
case PAGEDN:
curr_line += ph;
break;
default:
break;
}
if (curr_line > numlines - ph) curr_line = numlines-ph;
if (curr_line < 0) curr_line = 0;
}
cls();
return;
}
void runhelp(const char *filename)
{
char dp;
char fullname[HELPDIRLEN+16];
dp = getdisppage();
if (dp != HELPPAGE) setdisppage(HELPPAGE);
cursoroff();
if (helpbasedir[0] != 0) {
strcpy(fullname,helpbasedir);
strcat(fullname,"/");
strcat(fullname,filename);
showhelp(fullname);
}
else showhelp (filename); // Assume filename is absolute
if (dp != HELPPAGE) setdisppage(dp);
}
void runhelpsystem(unsigned int helpid)
{
char filename[15];
sprintf(filename,"hlp%5d.txt",helpid);
runhelp(filename);
}
void init_help(const char *helpdir)
{
if (helpdir != NULL)
strcpy(helpbasedir,helpdir);
else helpbasedir[0] = 0;
}
void close_help(void)
{
}
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