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.

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+");
-}