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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 <syslinux/loadfile.h> // to read entire file into memory
int nc, nr; // Number of columns/rows of the screen
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
static 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
static 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
static void printtext(char *buf, int from)
{
char *f, *t;
int right, nlines, i;
// clear window to print
right = nc - HELP_RIGHT_MARGIN;
nlines = nr - HELP_BODY_ROW - HELP_BOTTOM_MARGIN - 1;
f = findline(buf, from);
if (!f)
return; // nothing to print
if (*f == '\n')
f++; // start of from+1st line
t = f;
while (i < nlines) {
gotoxy(HELP_BODY_ROW + i, HELP_LEFT_MARGIN);
clear_end_of_line();
putchar(SO);
gotoxy(HELP_BODY_ROW + i, nc - 1);
putch(LEFT_BORDER, 0x07);
putchar(SI);
gotoxy(HELP_BODY_ROW + i, HELP_LEFT_MARGIN);
while (*t != '\n') {
if (*t == '\0')
return;
putchar(*t);
t++;
}
putchar('\n');
t++;
i++;
}
}
void showhelp(const char *filename)
{
char ph;
char *title, *text;
union {
char *buffer;
void *vbuf;
} buf; // This is to avoild type-punning issues
char line[512];
size_t size;
int scan;
int rv, numlines, curr_line;
if (getscreensize(1, &nr, &nc)) {
/* Unknown screen size? */
nc = 80;
nr = 24;
}
ph = nr - HELP_BODY_ROW;
cls();
/* Turn autowrap off, to avoid scrolling the menu */
printf(CSI "?7l");
if (filename == NULL) { // print file contents
strcpy(line, "Filename not given");
goto puke;
}
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);
goto puke;
}
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.
numlines = countlines(text);
curr_line = 0;
scan = KEY_ESC + 1; // anything except ESCAPE
/* top, left, bottom, right, attr */
drawbox(0, 0, nr - 1, nc - 1, 0x07);
while (scan != KEY_ESC) {
/* Title */
gotoxy(1, (nc - strlen(title)) / 2);
fputs(title, stdout);
drawhorizline(2, HELP_LEFT_MARGIN - 1, nc - HELP_RIGHT_MARGIN, 0x07, 0); // dumb==0
/* Text */
printtext(text, curr_line);
gotoxy(HELP_BODY_ROW - 1, nc - HELP_RIGHT_MARGIN);
if (curr_line > 0)
putchar(HELP_MORE_ABOVE);
else
putchar(' ');
gotoxy(nr - HELP_BOTTOM_MARGIN - 1, nc - HELP_RIGHT_MARGIN);
if (curr_line < numlines - ph)
putchar(HELP_MORE_BELOW);
else
putchar(' ');
scan = get_key(stdout, 0); // wait for user keypress
switch (scan) {
case KEY_HOME:
curr_line = 0;
break;
case KEY_END:
curr_line = numlines;
break;
case KEY_UP:
curr_line--;
break;
case KEY_DOWN:
curr_line++;
break;
case KEY_PGUP:
curr_line -= ph;
break;
case KEY_PGDN:
curr_line += ph;
break;
default:
break;
}
if (curr_line > numlines - ph)
curr_line = numlines - ph;
if (curr_line < 0)
curr_line = 0;
}
out:
cls();
return;
puke:
gotoxy(HELP_BODY_ROW, HELP_LEFT_MARGIN);
fputs(line, stdout);
while (1) {
scan = get_key(stdin, 0);
if (scan == KEY_ESC)
break;
}
goto out;
}
void runhelp(const char *filename)
{
char fullname[HELPDIRLEN + 16];
cls();
cursoroff();
if (helpbasedir[0] != 0) {
strcpy(fullname, helpbasedir);
strcat(fullname, "/");
strcat(fullname, filename);
showhelp(fullname);
} else
showhelp(filename); // Assume filename is absolute
}
void runhelpsystem(unsigned int helpid)
{
char filename[15];
sprintf(filename, "hlp%05d.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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