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-rw-r--r--src/adjbacklight.c315
1 files changed, 255 insertions, 60 deletions
diff --git a/src/adjbacklight.c b/src/adjbacklight.c
index 31e4811..4bf50ac 100644
--- a/src/adjbacklight.c
+++ b/src/adjbacklight.c
@@ -21,10 +21,20 @@
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
+#include <sys/types.h>
#include <unistd.h>
#include <dirent.h>
#include <string.h>
#include <limits.h>
+#include <alloca.h>
+
+
+
+
+#ifndef PATH_MAX
+#warning PATH_MAX is not defined
+#define PATH_MAX 4096
+#endif
@@ -43,11 +53,35 @@
/**
* Print a line to stdout
*
- * @param S:char* The string to print
+ * @param S:const char* The string to print
*/
#define P(S) printf("%s", S "\n")
+/**
+ * Cut a string of at the first line break
+ * A help `int` named `i` must be available
+ *
+ * @param data:char* The string, it will be modified
+ * @return :char* The input string, it has been modified
+ */
+#define unnl(data) \
+ ({ \
+ for (i = 0; *(data + i); i++) \
+ if (*(data + i) == '\n') \
+ *(data + i) = 0; \
+ data; \
+ })
+
+
+
+/**
+ * Test whether a string numerical and with at most two trailing '%'
+ *
+ * @param str The string
+ * @return Whether the test passed
+ */
+static int isnumerical(const char* str);
/**
* Interactively adjust the backlight on a device
@@ -58,6 +92,14 @@
static void adjust(int cols, const char* device);
/**
+ * Gets the current backlight setting on a device
+ *
+ * @param device The device from which to get backlight
+ * @return The brightness as a [0; 1] float, negative on error
+ */
+static float getbrightness(const char* device);
+
+/**
* Read a file
*
* @param output Buffer to store the file's content in
@@ -113,9 +155,10 @@ int main(int argc, char** argv)
struct winsize win;
struct termios saved_stty;
struct termios stty;
- pid_t pid;
int i, j;
- int all = 0, cols = 80, ndevices = 0;
+ pid_t pid = 0;
+ char* set = NULL;
+ int get = 0, all = 0, cols = 80, ndevices = 0;
char** devices = alloca(argc * sizeof(char*));
@@ -160,10 +203,36 @@ int main(int argc, char** argv)
P("\n");
return 0;
}
+ else if (T("-s") || T("--set"))
+ {
+ char* tmp;
+ if (i + 1 == argc)
+ fprintf(stderr, "%s: argument for option %s is missing, ignoring option\n", *argv, arg);
+ else
+ if (!isnumerical(tmp = *(argv + i++)))
+ fprintf(stderr, "%s: argument for option %s is malformated, ignoring option\n", *argv, arg);
+ else
+ {
+ set = tmp;
+ get = 0;
+ }
+ }
+ else if (T("-g") || T("--get"))
+ {
+ get = 1;
+ set = NULL;
+ }
+ else if (((*arg == '-') || (*arg == '+') || (*arg == '=')) && isnumerical(arg + 1))
+ {
+ set = arg;
+ get = 0;
+ }
else
{
if (*arg && (*arg != '-'))
*(devices + ndevices++) = arg;
+ else
+ fprintf(stderr, "%s: ignoring unrecognised argument: %s\n", *argv, arg);
}
#undef T
}
@@ -172,7 +241,7 @@ int main(int argc, char** argv)
P("\n");
P("adjbacklight - Convient method for adjusting the backlight on your portable computer");
P("");
- P("USAGE: adjbacklight [ -c | -w | -a | DEVICE...]");
+ P("USAGE: adjbacklight (-c | -w | [-g | -s LEVEL | LEVEL] [-a | DEVICE...])");
P("");
P("Run with options to adjust the backlight on your monitors.");
P("");
@@ -187,7 +256,25 @@ int main(int argc, char** argv)
P("--warranty Display warranty disclaimer");
P("");
P("-a");
- P("--all Run for all devices, including ACPI devices ");
+ P("--all Run for all devices, including ACPI devices");
+ P("");
+ P("-g");
+ P("--get Get average brightness on devices");
+ P("");
+ P("-s");
+ P("--set LEVEL[%] Set brightness on devices");
+ P("");
+ P("+LEVEL Increase brightness on devices by actual value");
+ P("-LEVEL Decrease brightness on devices by actual value");
+ P("=LEVEL Set brightness on devices by actual value");
+ P("");
+ P("+LEVEL% Increase brightness on devices by percentage");
+ P("-LEVEL% Decrease brightness on devices by percentage");
+ P("=LEVEL% Set brightness on devices by percentage");
+ P("");
+ P("+LEVEL%% Increase brightness on devices by relative percentage");
+ P("-LEVEL%% Decrease brightness on devices by relative percentage");
+ P("=LEVEL%% Set brightness on devices by relative percentage");
P("");
P("");
P("KEYBOARD:");
@@ -226,54 +313,66 @@ int main(int argc, char** argv)
P("\n\n\n");
- /* Get the size of the terminal */
- if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == -1)
- perror(*argv);
- else
- cols = win.ws_col;
-
- /* Hide cursor */
- printf("%s", "\033[?25l");
- fflush(stdout);
-
- /* stty -icanon -echo */
- if (tcgetattr(STDIN_FILENO, &stty))
- {
- perror(*argv);
- return 1;
- }
- saved_stty = stty;
- stty.c_lflag &= ~(ICANON | ECHO);
- if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &stty))
+ if (!get && !set)
{
- perror(*argv);
- return 1;
+ /* Get the size of the terminal */
+ if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == -1)
+ perror(*argv);
+ else
+ cols = win.ws_col;
+
+ /* Hide cursor */
+ printf("%s", "\033[?25l");
+ fflush(stdout);
+
+ /* stty -icanon -echo */
+ if (tcgetattr(STDIN_FILENO, &stty))
+ {
+ perror(*argv);
+ return 1;
+ }
+ saved_stty = stty;
+ stty.c_lflag &= ~(ICANON | ECHO);
+ if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &stty))
+ {
+ perror(*argv);
+ return 1;
+ }
}
/* Fork to diminish risk of unclean exit */
- pid = FORK();
- if (pid == (pid_t)-1)
+ if (!get && !set)
{
- perror(*argv);
- pid = 0;
+ pid = FORK();
+ if (pid == (pid_t)-1)
+ {
+ perror(*argv);
+ pid = 0;
+ }
}
if (pid)
waitpid(pid, NULL, 0);
else
{
- line = malloc(cols * 3 * sizeof(char));
- space = malloc(cols * sizeof(char));
- for (i = 0; i < cols; i++)
+ float brightness = 0;
+ int nbrightness = 0;
+
+ if (!get && !set)
{
- *(line + i * 3 + 0) = 0xE2;
- *(line + i * 3 + 1) = 0x94;
- *(line + i * 3 + 2) = 0x80;
- *(space + i) = ' ';
+ line = malloc(cols * 3 * sizeof(char));
+ space = malloc(cols * sizeof(char));
+ for (i = 0; i < cols; i++)
+ {
+ *(line + i * 3 + 0) = (char)(0xE2);
+ *(line + i * 3 + 1) = (char)(0x94);
+ *(line + i * 3 + 2) = (char)(0x80);
+ *(space + i) = ' ';
+ }
+ *(space + cols - 1) = 0;
+ *(line + (cols - 2) * 3) = 0;
}
- *(space + cols - 1) = 0;
- *(line + (cols - 2) * 3) = 0;
if (ndevices)
{
@@ -287,7 +386,17 @@ int main(int argc, char** argv)
device += j + 1;
j = -1;
}
- adjust(cols, device);
+ if (get)
+ {
+ float value = getbrightness(device);
+ if (value >= 0.f)
+ {
+ brightness += value;
+ nbrightness++;
+ }
+ }
+ else
+ adjust(cols, device);
}
}
else
@@ -303,32 +412,89 @@ int main(int argc, char** argv)
device = ent->d_name;
if (all || (strstr(device, forbidden) != forbidden))
if (*device && (*device != '.'))
- adjust(cols, device);
+ {
+ if (get)
+ {
+ float value = getbrightness(device);
+ if (value >= 0.f)
+ {
+ brightness += value;
+ nbrightness++;
+ }
+ }
+ else
+ adjust(cols, device);
+ }
}
closedir(dir);
}
}
- free(line);
- free(space);
+ if (!get && !set)
+ {
+ free(line);
+ free(space);
+ }
+ else if (get)
+ {
+ brightness *= 100.f;
+ brightness /= nbrightness;
+ printf("%.2f%%\n", brightness);
+ fflush(stdout);
+ }
}
- /* `stty icanon echo` */
- if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_stty))
+ if (!get && !set)
{
- perror(*argv);
- return 1;
+ /* `stty icanon echo` */
+ if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_stty))
+ {
+ perror(*argv);
+ return 1;
+ }
+
+ /* Show cursor */
+ printf("%s", "\033[?25h");
+ fflush(stdout);
}
- /* Show cursor */
- printf("%s", "\033[?25h");
- fflush(stdout);
-
return 0;
}
+/**
+ * Test whether a string numerical and with at most two trailing '%'
+ *
+ * @param str The string
+ * @return Whether the test passed
+ */
+static int isnumerical(const char* str)
+{
+ int p = 0, d = 0;
+ if ((*str == 0) || (*str == '%'))
+ return 0;
+ for (; *str; str++)
+ {
+ switch (*str)
+ {
+ case '.':
+ if (d++)
+ return 0;
+ /* fall through */
+ case '0' ... '9':
+ if (p)
+ return 0;
+ break;
+
+ case '%':
+ p++;
+ break;
+ }
+ }
+ return p <= 2;
+}
+
/**
* Interactively adjust the backlight on a device
@@ -338,18 +504,10 @@ int main(int argc, char** argv)
*/
static void adjust(int cols, const char* device)
{
- #define unnl(data) \
- ({ \
- for (i = 0; *(data + i); i++) \
- if (*(data + i) == '\n') \
- *(data + i) = 0; \
- data; \
- })
-
int min, max, cur, step, init, i, d;
size_t lendir;
char* dir = alloca(PATH_MAX * sizeof(char));
- char* buf = alloca(256);
+ char* buf = alloca(256 * sizeof(char));
*dir = 0;
dir = strcat(dir, "/sys/class/backlight/");
@@ -403,6 +561,43 @@ static void adjust(int cols, const char* device)
/**
+ * Gets the current backlight setting on a device
+ *
+ * @param device The device from which to get backlight
+ * @return The brightness as a [0; 1] float, negative on error
+ */
+static float getbrightness(const char* device)
+{
+ int min, max, cur, i;
+ size_t lendir;
+ char* dir = alloca(PATH_MAX * sizeof(char));
+ char* buf = alloca(256);
+
+ *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 -1.f;
+ max = atoi(unnl(buf));
+ *(dir + lendir) = 0;
+ if (readfile(buf, strcat(dir, "brightness")))
+ return -1.f;
+ cur = atoi(unnl(buf));
+
+ if (max <= min)
+ return -1.f; /* what the buck */
+
+ return (float)cur / (float)(max - min);
+}
+
+
+
+/**
* Read a file
*
* @param output Buffer to store the file's content in
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-11-22 19:13:52 +0000