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/* $Id$
* MegaZeux
*
* Copyright (C) 1996 Greg Janson
* Copyright (C) 1998 Matthew D. Williams - dbwilli@scsn.net
*
* 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; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
// internal help system
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "scrdisp.h"
#include "helpsys.h"
#include "data.h"
#include "graphics.h"
#include "world.h"
int context = 72; // 72 = "No" context link
char *help = NULL;
int contexts[20];
int curr_context = 0;
void set_context(int con)
{
contexts[curr_context++] = context;
context = con;
}
void pop_context(void)
{
context = contexts[--curr_context];
}
void help_system(World *mzx_world)
{
FILE *fp;
int t1, t2;
cursor_mode_types old_cmode = get_cursor_mode();
int where;
int offs;
int size;
char file[13];
char file2[13];
char label[20];
// Reserve memory (24k)
help = (char *)malloc(24576);
// Search context links
fp = fopen(help_file, "rb");
if(fp == NULL)
{
free(help);
return;
}
t1 = fgetw(fp);
fseek(fp, t1 * 21 + 4 + context * 12, SEEK_SET);
// At proper context info
where = fgetd(fp); // Where file to load is
size = fgetd(fp); // Size of file to load
offs = fgetd(fp); //Offset within file of link
// Jump to file
fseek(fp, where, SEEK_SET);
// Read it in
fread(help, 1, size, fp);
// Display it
cursor_off();
labelled:
help_display(mzx_world, help, offs, file, label);
// File?
if(file[0])
{
//Yep. Search for file.
fseek(fp, 2, SEEK_SET);
for(t2 = 0; t2 < t1; t2++)
{
fread(file2, 1, 13, fp);
if(!strcmp(file, file2)) break;
fseek(fp, 8, SEEK_CUR);
}
if(t2 < t1)
{
//Found file.
where = fgetd(fp);
size = fgetd(fp);
fseek(fp, where, SEEK_SET);
fread(help, 1, size, fp);
// Search for label
for(t2 = 0; t2 < size; t2++)
{
if(help[t2] != 255) continue;
if(help[t2 + 1] != ':') continue;
if(!strcmp(help + t2 + 3, label)) break; // Found label!
}
if(t2 < size)
{
//Found label. t2 is offset.
offs = t2;
goto labelled;
}
}
}
//All done!
fclose(fp);
free(help);
set_cursor_mode(old_cmode);
}
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