From 4ae7d9cd14b3c80b7e45e27d1d74f01497a0ec01 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@operamail.com>
Date: Sun, 26 Jan 2014 09:55:39 +0100
Subject: implement --set
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Signed-off-by: Mattias Andrée <maandree@operamail.com>
---
src/adjbacklight.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 93 insertions(+)
diff --git a/src/adjbacklight.c b/src/adjbacklight.c
index 4bf50ac..289401c 100644
--- a/src/adjbacklight.c
+++ b/src/adjbacklight.c
@@ -99,6 +99,14 @@ static void adjust(int cols, const char* device);
*/
static float getbrightness(const char* device);
+/**
+ * Sets the current backlight setting on a device
+ *
+ * @param device The device from which to get backlight
+ * @param adjustment The adjustment to make
+ */
+static void setbrightness(const char* device, const char* adjustment);
+
/**
* Read a file
*
@@ -395,6 +403,8 @@ int main(int argc, char** argv)
nbrightness++;
}
}
+ else if (set)
+ setbrightness(device, set);
else
adjust(cols, device);
}
@@ -422,6 +432,8 @@ int main(int argc, char** argv)
nbrightness++;
}
}
+ else if (set)
+ setbrightness(device, set);
else
adjust(cols, device);
}
@@ -597,6 +609,87 @@ static float getbrightness(const char* device)
+/**
+ * Sets the current backlight setting on a device
+ *
+ * @param device The device from which to get backlight
+ * @param adjustment The adjustment to make
+ */
+static void setbrightness(const char* device, const char* adjustment)
+{
+ int min, max, cur, i, adj;
+ size_t lendir;
+ char* dir = alloca(PATH_MAX * sizeof(char));
+ char* buf = alloca(256);
+ int act = 0, integer = 0, decimal = 0, p = 0, d = 0;
+
+ *dir = 0;
+ dir = strcat(dir, "/sys/class/backlight/");
+ dir = strcat(dir, device);
+ dir = strcat(dir, "/");
+ lendir = strlen(dir);
+
+ /* Get brightness parameters */
+ min = 0;
+ if (readfile(buf, strcat(dir, "max_brightness")))
+ return;
+ max = atoi(unnl(buf));
+ *(dir + lendir) = 0;
+ if (readfile(buf, strcat(dir, "brightness")))
+ return;
+ cur = atoi(unnl(buf));
+
+ if (max <= min)
+ return; /* what the buck */
+
+ /* Read -/+/= head */
+ if (*adjustment == '-')
+ act = -1;
+ else if (*adjustment == '+')
+ act = 1;
+ else if (*adjustment != '=')
+ adjustment--;
+ adjustment++;
+
+ /* Parse numerical part */
+ for (; *adjustment && (*adjustment != '%'); adjustment++)
+ if (*adjustment == '.')
+ d = 1;
+ else if (d)
+ {
+ if ((d * 10 < 0) || (decimal * 10 + 9 < 0)) /* stop if the precision is too high */
+ continue;
+ d *= 10;
+ decimal *= 10;
+ decimal += (*adjustment) - '0';
+ }
+ else
+ {
+ integer *= 10;
+ integer -= (*adjustment) - '0';
+ }
+
+ /* Count number of p:s */
+ while (*adjustment++)
+ p++;
+
+ /* Calculate value to send */
+ if (p == 0)
+ adj = (int)((double)decimal / (double)d + 0.5d) - integer;
+ else if (p == 1)
+ adj = (int)(((double)decimal / (double)d - (double)integer) * (double)(max - min));
+ else
+ adj = (int)(((double)decimal / (double)d - (double)integer) * (double)cur);
+ adj = (act & 1) * cur + (act | 1) * adj;
+ if (adj < min) adj = min;
+ if (adj > max) adj = max;
+
+ /* Send value */
+ writefile(buf, adj, dir);
+}
+
+
+
/**
* Read a file
*
--
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