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/** \file clients/lcdvc/vc_link.c
* Functions to handle a virtual console.
*/
/*-
* This file is part of lcdvc, an LCDproc client.
*
* This file is released under the GNU General Public License. Refer to the
* COPYING file distributed with this package.
*
* Copyright (c) 2002, Joris Robijn
* 2006-2008, Peter Marschall
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include "lcdvc.h"
#include "vc_link.h"
#include "shared/report.h"
#include "shared/sockets.h"
int vcs0, vcsa;
unsigned short vc_width = 0, vc_height = 0;
unsigned short vc_cursor_x = 0, vc_cursor_y = 0;
char *vc_buf = NULL;
int open_vcs(void)
{
/* Open the /dev/vcsX and /dev/vcsaX devices */
vcs0 = open(vcs_device, O_RDONLY);
if (vcs0 < 0) {
report(RPT_ERR, "Could not open %s: %s", vcs_device, strerror(errno));
return -1;
}
vcsa = open(vcsa_device, O_RDONLY);
if (vcsa < 0) {
report(RPT_ERR, "Could not open %s: %s", vcsa_device, strerror(errno));
return -1;
}
return 0;
}
int read_vcdata(void)
{
unsigned short new_vc_height;
unsigned short new_vc_width;
int bytes_read;
unsigned char buf[20];
/* Read size and cursor position from /dev/vcsa */
lseek(vcsa, 0, SEEK_SET);
bytes_read = read(vcsa, buf, 4);
if (bytes_read != 4) {
report(RPT_ERR, "Could not read from %s", vcsa_device);
return -1;
}
new_vc_height = buf[0];
new_vc_width = buf[1];
vc_cursor_x = buf[2];
vc_cursor_y = buf[3];
/* Screen resize or initial buffer allocation ? */
if ((new_vc_width != vc_width) || (new_vc_height != vc_height)) {
vc_width = new_vc_width;
vc_height = new_vc_height;
if (vc_width * vc_height > 0) {
vc_buf = realloc(vc_buf, vc_width * vc_height);
if (vc_buf == NULL) {
report(RPT_ERR, "malloc failure: %s", strerror(errno));
return -1;
}
memset(vc_buf, ' ', vc_width * vc_height);
}
}
/* Read characters from /dev/cvs0 */
lseek(vcs0, 0, SEEK_SET);
bytes_read = read(vcs0, vc_buf, vc_width * vc_height);
if (bytes_read != vc_width * vc_height) {
report(RPT_ERR, "Could not read from %s", vcs_device);
return -1;
}
return 0;
}
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