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33 lines
679 B
C
33 lines
679 B
C
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/* See LICENSE file for copyright and license details. */
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#include "../util.h"
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#if defined(__linux__)
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#include <limits.h>
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#define BRIGHTNESS_MAX "/sys/class/backlight/%s/max_brightness"
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#define BRIGHTNESS_CUR "/sys/class/backlight/%s/brightness"
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const char *
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backlight_perc(const char *card)
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{
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char path[PATH_MAX];
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int max, cur;
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if (esnprintf(path, sizeof (path), BRIGHTNESS_MAX, card) < 0 ||
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pscanf(path, "%d", &max) != 1) {
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return NULL;
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}
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if (esnprintf(path, sizeof (path), BRIGHTNESS_CUR, card) < 0 ||
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pscanf(path, "%d", &cur) != 1) {
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return NULL;
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}
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if (max == 0) {
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return NULL;
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}
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return bprintf("%d", cur * 100 / max);
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}
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#endif
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