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/*
* BSD Zero Clause License
*
* Copyright (c) 2022 Thomas Voss
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include "lux.h"
int
luxmax(lux_t *disp)
{
/* The maximum brightness shouldn't change, so we can cache it in the
* struct.
*/
if (disp->__max != -1)
return disp->__max;
int fd = openat(disp->__dirfd, "max_brightness", O_RDONLY);
if (fd == -1)
return -1;
FILE *stream = fdopen(fd, "r");
if (stream == NULL) {
close(fd);
return -1;
}
fscanf(stream, "%d", &disp->__max);
fclose(stream);
return disp->__max;
}
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