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/**
* crt-calibrator – Calibration utility for CRT monitors
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "framebuffer.h"
#include <unistd.h>
#include <stdio.h>
/**
* The psuedodevice pathname pattern used to access a framebuffer
*/
#ifndef FB_DEVICE_PATTERN
# define FB_DEVICE_PATTERN "/dev/fb%lu"
#endif
/**
* Figure out how many framebuffers there are on the system
*
* @return The number of framebuffers on the system
*/
size_t fb_count(void)
{
char buf[sizeof(FB_DEVICE_PATTERN) / sizeof(char) + 3 * sizeof(size_t)];
size_t count = 0;
for (;; count++)
{
sprintf(buf, FB_DEVICE_PATTERN, count);
if (access(buf, F_OK) < 0)
return count;
}
}
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