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-rw-r--r--src/adjbacklight.c337
1 files changed, 291 insertions, 46 deletions
diff --git a/src/adjbacklight.c b/src/adjbacklight.c
index d50fbce..0fa3ab9 100644
--- a/src/adjbacklight.c
+++ b/src/adjbacklight.c
@@ -24,6 +24,8 @@
#include <unistd.h>
#include <dirent.h>
#include <string.h>
+#include <limits.h>
+
/**
@@ -47,7 +49,55 @@
-#define adjust(X,Y,Z)
+/**
+ * Interactively adjust the backlight on a device
+ *
+ * @param cols The number of columns on the terminal
+ * @param device The device on which to adjust backlight
+ */
+static void adjust(int cols, const char* device);
+
+/**
+ * Read a file
+ *
+ * @param output Buffer to store the file's content in
+ * @param file The file to read
+ * @return Zero on success, non-zero on failure
+ */
+static int readfile(char* output, const char* file);
+
+/**
+ * Write an integer to a file
+ *
+ * @param buffer Buffer for temporary data
+ * @param integer The integer to write
+ * @param file The file to which to write
+ * @return Zero on success, non-zero on failure
+ */
+static int writefile(char* buffer, int integer, const char* file);
+
+/**
+ * Print the status
+ *
+ * @param min The minimum possible brightness
+ * @param max The maximum possible brightness
+ * @param init The brightness used when the program started
+ * @param cur The current brightness
+ * @param cols The number of columns on the terminal
+ */
+static void bars(int min, int max, int init, int cur, int cols);
+
+
+
+/**
+ * A series of spaces used to print the bar
+ */
+static char* space;
+
+/**
+ * A series of vertical lines used to print the bar
+ */
+static char* line;
@@ -61,15 +111,12 @@
int main(int argc, char** argv)
{
struct winsize win;
- int rows, cols;
struct termios saved_stty;
struct termios stty;
pid_t pid;
-
int i, j;
- int all = 0;
+ int all = 0, cols = 80, ndevices = 0;
char** devices = alloca(argc * sizeof(char*));
- int ndevices = 0;
if (argc > 1)
@@ -179,18 +226,11 @@ int main(int argc, char** argv)
P("\n\n\n");
- /* rows cols = $(stty size) */
+ /* Get the size of the terminal */
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == -1)
- {
- perror(*argv);
- rows = 24;
- cols = 80;
- }
+ perror(*argv);
else
- {
- rows = win.ws_row;
- cols = win.ws_col;
- }
+ cols = win.ws_col;
/* Hide cursor */
printf("%s", "\033[?25l");
@@ -211,7 +251,7 @@ int main(int argc, char** argv)
}
- /* Fork to diminish risk for unclean exit */
+ /* Fork to diminish risk of unclean exit */
pid = FORK();
if (pid == (pid_t)-1)
{
@@ -222,38 +262,56 @@ int main(int argc, char** argv)
if (pid)
waitpid(pid, NULL, 0);
else
- if (ndevices)
- {
- char* device;
- for (i = 0; i < ndevices; i++)
- {
- device = *(devices + i);
- for (j = 0; *(device + j); j++)
- if (*(device + j) == '/')
+ {
+ line = malloc(cols * 4 * sizeof(char));
+ space = malloc(cols * sizeof(char));
+ for (i = 0; i < cols; i++)
+ {
+ *(line + i * 4 + 0) = 0xE2;
+ *(line + i * 4 + 1) = 0x94;
+ *(line + i * 4 + 2) = 0x80;
+ *(line + i * 4 + 3) = 0x0A;
+ *(space + i) = ' ';
+ }
+ *(space + cols - 1) = 0;
+ *(line + (cols - 2) * 4) = 0;
+
+ if (ndevices)
+ {
+ char* device;
+ for (i = 0; i < ndevices; i++)
+ {
+ device = *(devices + i);
+ for (j = 0; *(device + j); j++)
+ if (*(device + j) == '/')
+ {
+ device += j + 1;
+ j = -1;
+ }
+ adjust(cols, device);
+ }
+ }
+ else
+ {
+ struct dirent* ent;
+ DIR* dir = opendir("/sys/class/backlight");
+ if (dir)
+ {
+ char* device;
+ char* forbidden = "acpi_video";
+ while ((ent = readdir(dir)))
{
- device += j + 1;
- j = -1;
+ device = ent->d_name;
+ if (all || (strstr(device, forbidden) != forbidden))
+ adjust(cols, device);
}
- adjust(rows, cols, device);
- }
- }
- else
- {
- struct dirent* ent;
- DIR* dir = opendir("/sys/class/backlight");
- if (dir)
- {
- char* device;
- char* forbidden = "acpi_video";
- while ((ent = readdir(dir)))
- {
- device = ent->d_name;
- if (all || (strstr(device, forbidden) != forbidden))
- adjust(rows, cols, device);
- }
- closedir(dir);
- }
- }
+ closedir(dir);
+ }
+ }
+
+ free(line);
+ free(space);
+ }
/* `stty icanon echo` */
@@ -270,3 +328,190 @@ int main(int argc, char** argv)
return 0;
}
+
+
+/**
+ * Interactively adjust the backlight on a device
+ *
+ * @param cols The number of columns on the terminal
+ * @param device The device on which to adjust backlight
+ */
+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);
+
+ *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 */
+
+ step = (max - min) / 200 ?: 1;
+ init = cur;
+
+ P("\n\n\n\n\n");
+ bars(min, max, init, cur, cols);
+
+ while ((d = getchar()) != -1)
+ switch (d)
+ {
+ case 'q':
+ case '\n':
+ case 4:
+ P("");
+ return;
+
+ case 'A':
+ case 'C':
+ cur += step << 1;
+ /* fall through */
+ case 'B':
+ case 'D':
+ cur -= step;
+ if (cur < min) cur = min;
+ if (cur > max) cur = max;
+ if (writefile(buf, cur, dir))
+ return;
+ bars(min, max, init, cur, cols);
+ }
+}
+
+
+
+/**
+ * Read a file
+ *
+ * @param output Buffer to store the file's content in
+ * @param file The file to read
+ * @return Zero on success, non-zero on failure
+ */
+static int readfile(char* output, const char* file)
+{
+ #define BLOCK_SIZE 256 /* We will not even encounter that much */
+ FILE* f;
+ size_t got, have = 0;
+ int ended = 0;
+
+ if ((f = fopen(file, "r")) == NULL)
+ {
+ perror(file);
+ return -1;
+ }
+
+ while (!ended)
+ {
+ got = fread(output + have, 1, BLOCK_SIZE, f);
+ if (got != BLOCK_SIZE)
+ {
+ ended = feof(f);
+ have += got;
+ clearerr(f);
+ fclose(f);
+ if (!ended)
+ {
+ perror(file);
+ return -1;
+ }
+ }
+ else
+ have += got;
+ }
+
+ *(output + have) = 0;
+ return 0;
+}
+
+
+
+/**
+ * Write an integer to a file
+ *
+ * @param buffer Buffer for temporary data
+ * @param integer The integer to write
+ * @param file The file to which to write
+ * @return Zero on success, non-zero on failure
+ */
+static int writefile(char* buffer, int integer, const char* file)
+{
+ FILE* f;
+ size_t n = 0;
+
+ buffer += 32;
+ do
+ {
+ *(buffer - n++) = (integer % 10) + '0';
+ integer /= 10;
+ }
+ while (integer);
+ buffer -= n - 1;
+ *(buffer + n++) = '\n';
+
+ if ((f = fopen(file, "w")) == NULL)
+ {
+ perror(file);
+ return -1;
+ }
+
+ if (fwrite(buffer, 1, n, f) != n)
+ {
+ perror(file);
+ fclose(f);
+ return -1;
+ }
+
+ fclose(f);
+ return 0;
+}
+
+
+
+/**
+ * Print the status
+ *
+ * @param min The minimum possible brightness
+ * @param max The maximum possible brightness
+ * @param init The brightness used when the program started
+ * @param cur The current brightness
+ * @param cols The number of columns on the terminal
+ */
+static void bars(int min, int max, int init, int cur, int cols)
+{
+ int mid = (int)((cur - min) * (float)(cols - 2) / (float)(max - min) + 0.5f);
+
+ printf("\033[1000D\033[6A");
+ printf("\033[2K┌%s┐\n", line);
+ *(space + mid) = 0;
+ printf("\033[2K│\033[47m%s\033[49m%s│\n", space, space + mid + 1);
+ *(space + mid) = ' ';
+ printf("\033[2K└%s┘\n", line);
+ printf("\033[2KMaximum brightness: %i\n", max);
+ printf("\033[2KInitial brightness: %i\n", init);
+ printf("\033[2KCurrent brightness: %i\n", cur);
+
+ fflush(stdout);
+}
+
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