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authorThomas Voss <mail@thomasvoss.com> 2022-10-13 00:03:37 +0200
committerThomas Voss <mail@thomasvoss.com> 2022-10-13 00:03:37 +0200
commit7118692e506f9698a77c7cceea3b1dd47bb4b99a (patch)
treed37a10abde76a7fb063e57135d4408973e99cc0d /src/luxinit.c
parentcd3b1a5ba87b804fb7f8b620460d49a5d305a730 (diff)
Move functions to their own files
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.
Diffstat (limited to 'src/luxinit.c')
-rw-r--r--src/luxinit.c68
1 files changed, 68 insertions, 0 deletions
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 <sys/types.h>
+
+#include <dirent.h>
+#include <fcntl.h>
+
+#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;
+}