diff options
Diffstat (limited to 'liblux.c')
| -rw-r--r-- | liblux.c | 208 |
1 files changed, 0 insertions, 208 deletions
diff --git a/liblux.c b/liblux.c deleted file mode 100644 index 8061eec..0000000 --- a/liblux.c +++ /dev/null @@ -1,208 +0,0 @@ -/* - * BSD Zero Clause License - * - * Copyright (c) 2022 Thomas Voss - * - * Permission to use, copy, modify, and/or distribute this software for any - * purpose with or without fee is hereby granted. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH - * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY - * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, - * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM - * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR - * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR - * PERFORMANCE OF THIS SOFTWARE. - */ - -#define _POSIX_C_SOURCE 200809L - -#include <sys/types.h> - -#include <dirent.h> -#include <fcntl.h> -#include <stdio.h> -#include <unistd.h> - -#include "lux.h" - -#ifdef O_PATH - #define GETDIR_FLAGS O_PATH -#else - #define GETDIR_FLAGS (O_RDONLY | O_DIRECTORY) -#endif - -static int intlen(int); -static int getdir(void); -static FILE *getbstream(int); - -void -luxfree(struct luxdisp *disp) -{ - if (disp->__dirfd != -1) - close(disp->__dirfd); - if (disp->__bstream != NULL) - fclose(disp->__bstream); -} - -int -luxinit(struct luxdisp *disp) -{ - /* Set the default values for the luxdisp struct. We want to be as lazy - * as possible, so we don't bother with __bstream and __max yet. We do - * need __dirfd though. - */ - *disp = (struct luxdisp) { - .__bstream = NULL, - .__max = -1, - .__dirfd = getdir() - }; - return disp->__dirfd; -} - -int -luxmax(struct luxdisp *disp) -{ - /* The maximum brightness shouldn't change, so we can cache it in the - * struct. - */ - if (disp->__max != -1) - return disp->__max; - - int fd = openat(disp->__dirfd, "max_brightness", O_RDONLY); - if (fd == -1) - return -1; - FILE *stream = fdopen(fd, "r"); - if (stream == NULL) { - close(fd); - return -1; - } - - fscanf(stream, "%d", &disp->__max); - fclose(stream); - return disp->__max; -} - -int -luxget(struct luxdisp *disp) -{ - /* If we don't have an open stream with the brightness file yet then - * open one. If we do, we instead rewind to the start of the file so - * that we don't just read an EOF. - */ - if (disp->__bstream == NULL) { - if ((disp->__bstream = getbstream(disp->__dirfd)) == NULL) - return -1; - } else - rewind(disp->__bstream); - - int n; - fscanf(disp->__bstream, "%d", &n); - return n; -} - -int -luxset(struct luxdisp *disp, int n) -{ - /* The same deal as in luxget() */ - if (disp->__bstream == NULL) { - if ((disp->__bstream = getbstream(disp->__dirfd)) == NULL) - return -1; - } else - rewind(disp->__bstream); - - /* After writing the new brightness value to the brightness file, we - * need to truncate it so that luxset(disp, 1234); luxset(disp, 9); - * gives us a final brightness of 2 and not 9234. - */ - fprintf(disp->__bstream, "%d", n); - ftruncate(fileno(disp->__bstream), intlen(n)); - return n; -} - -int -luxinc(struct luxdisp *disp, int n) -{ - return luxset(disp, luxget(disp) + n); -} - -int -luxdec(struct luxdisp *disp, int n) -{ - return luxinc(disp, -n); -} - -double -luxgetp(struct luxdisp *disp) -{ - int cur, max; - if ((cur = luxget(disp)) == -1 || (max = luxmax(disp)) == -1) - return -1; - return (double) cur / max * 100; -} - -double -luxsetp(struct luxdisp *disp, double p) -{ - int max = luxmax(disp); - return max == -1 ? -1 : luxset(disp, (int) (p / 100 * max)); -} - -double -luxincp(struct luxdisp *disp, double p) -{ - return luxsetp(disp, luxgetp(disp) + p); -} - -double -luxdecp(struct luxdisp *disp, double p) -{ - return luxincp(disp, -p); -} - -int -intlen(int n) -{ - return n < 10 ? 1 - : n < 100 ? 2 - : n < 1000 ? 3 - : n < 10000 ? 4 - : n < 100000 ? 5 - : n < 1000000 ? 6 - : n < 10000000 ? 7 - : n < 100000000 ? 8 - : n < 1000000000 ? 9 - : 10; -} - -int -getdir(void) -{ - int fd, dfd; - struct dirent *dp; - DIR *dir; - - /* To get the file descriptor for the directory where all the brightness - * files are located, we first need to open BACKLIGHT_DIR which is the - * directory where the backlight directories are located. Then we need - * to get a DIR* of that directory and get the 3rd entry. We need the - * third because the fist and second are the . and .. folders. Finally - * we open the folder so that we have a file descriptor we can return. - */ - if ((dfd = open(BACKLIGHT_DIR, O_RDONLY)) == -1 - || (dir = fdopendir(dfd)) == NULL - || (dp = readdir(dir)) == NULL - || (dp = readdir(dir)) == NULL - || (dp = readdir(dir)) == NULL - || (fd = openat(dfd, dp->d_name, GETDIR_FLAGS)) == -1) - return -1; - - closedir(dir); - return fd; -} - -FILE * -getbstream(int dirfd) -{ - return fdopen(openat(dirfd, "brightness", O_RDWR), "r+"); -} |