From f84e31b73f98c071e57eac8ad632b6cd80e80b0a Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Sat, 25 Jan 2014 18:45:23 +0100 Subject: translate the java code to c MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/adjbacklight.c | 337 +++++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 291 insertions(+), 46 deletions(-) (limited to 'src') 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 #include #include +#include + /** @@ -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); +} + -- cgit v1.2.3-70-g09d2