From 7118692e506f9698a77c7cceea3b1dd47bb4b99a Mon Sep 17 00:00:00 2001 From: Thomas Voss Date: Thu, 13 Oct 2022 00:03:37 +0200 Subject: Move functions to their own files MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Also we move the source code to a src/ directory. We also move from using `struct luxdisp` to `lux_t` to signify that we don’t want the user to be messing with the struct members. --- src/luxinit.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 src/luxinit.c (limited to 'src/luxinit.c') diff --git a/src/luxinit.c b/src/luxinit.c new file mode 100644 index 0000000..ae25925 --- /dev/null +++ b/src/luxinit.c @@ -0,0 +1,68 @@ +/* + * 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. + */ + +#include + +#include +#include + +#include "lux.h" + +static int getdir(void); + +int +luxinit(lux_t *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 = (lux_t) { + .__bstream = NULL, + .__max = -1, + .__dirfd = getdir() + }; + return disp->__dirfd; +} + +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 LUX_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(LUX_BACKLIGHT_DIR, O_RDONLY)) == -1 + || (dir = fdopendir(dfd)) == NULL) + return -1; + if ((dp = readdir(dir)) == NULL + || (dp = readdir(dir)) == NULL + || (dp = readdir(dir)) == NULL + || (fd = openat(dfd, dp->d_name, LUX_GDIR_FLAGS)) == -1) + fd = -1; + + closedir(dir); + return fd; +} -- cgit v1.2.3