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/*
* Display a page from help.txt, the argument is the scan code of a function
* key. F1..F10 display pages 1..10, HOME is page zero, PGUP and PGDN are
* previous and next page.
*/
#include "monitor.h"
#ifndef NOCOMMAND
struct keys {
int key;
int rel;
int abs;
} keys[] = {
{0xC7, 0, 0}, /* HOME page 0*/
{0xBB, 0, 1}, /* F1 page 1 */
{0xBC, 0, 2}, /* F2 page 2 */
{0xBD, 0, 3}, /* F3 page 3 */
{0xBE, 0, 4}, /* F4 page 4 */
{0xBF, 0, 5}, /* F5 page 5 */
{0xC0, 0, 6}, /* F6 page 6 */
{0xC1, 0, 7}, /* F7 page 7 */
{0xC2, 0, 8}, /* F8 page 8 */
{0xC3, 0, 9}, /* F9 page 9 */
{0xC4, 0, 10}, /* F10 page 10 */
{0xC9, -1,0}, /* PGUP page-- */
{0xD1, 1,0}, /* PGDN page++ */
{0,0,1}
};
cmd_help(ptr)
char * ptr;
{
int helpkey = 1;
getnum(&ptr, &helpkey);
return help_key(helpkey);
}
help_key(helpkey)
int helpkey;
{
static int lastpage = 0;
int i;
for(i=0; keys[i].key; i++)
if( keys[i].key == helpkey || i == helpkey )
break;
if( keys[i].key == 0 )
{
printf("Unbound key, press F1 for general help\n");
return -1;
}
if( keys[i].rel ) lastpage += keys[i].rel;
else lastpage = keys[i].abs;
if( lastpage < 0 ) { lastpage=0; return 0; }
return display_help(lastpage);
}
display_help(page)
int page;
{
char buffer[1024];
long length= -1;
int left = 0;
int ch,lastch = '\n';
int flg = 0;
if( open_file("help.txt") < 0 )
{
if( page == 1 )
printf("Help file 'help.txt' is not available, sorry.\n");
return -1;
}
for(length = file_length(); length>0; length--)
{
if( left==0 )
{
if( read_block(buffer) < 0 ) break;
left = 1024;
}
ch = buffer[1024-left]; left--;
if( ch == '%' && lastch == '\n' ) { flg = 1; page--; }
if( page < 0 ) break;
if( page == 0 && flg == 0 ) putchar(ch);
if( ch == '\n' ) flg = 0;
lastch = ch;
}
return 0;
}
#endif
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