Move C code to bin, Makefile, AGPL

1 files changed, 84 insertions, 0 deletions

diff --git a/bin/bri.c b/bin/bri.c
new file mode 100644
index 00000000..f5dd5a5c
--- /dev/null
+++ b/bin/bri.c
@@ -0,0 +1,84 @@
+/* Backlight brightness control.
+ *
+ * Copyright (c) 2017, Curtis McEnroe <programble@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <dirent.h>
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <sysexits.h>
+#include <unistd.h>
+
+static const char *CLASS = "/sys/class/backlight";
+
+int main(int argc, char *argv[]) {
+    int error;
+
+    if (argc < 2) errx(EX_USAGE, "usage: bri N | +... | -...");
+
+    error = chdir(CLASS);
+    if (error) err(EX_IOERR, "%s", CLASS);
+
+    DIR *dir = opendir(".");
+    if (!dir) err(EX_IOERR, "%s", CLASS);
+
+    struct dirent *entry;
+    while (NULL != (errno = 0, entry = readdir(dir))) {
+        if (entry->d_name[0] == '.') continue;
+
+        error = chdir(entry->d_name);
+        if (error) err(EX_IOERR, "%s", entry->d_name);
+        break;
+    }
+    if (!entry) {
+        if (errno) err(EX_IOERR, "%s", CLASS);
+        errx(EX_CONFIG, "empty %s", CLASS);
+    }
+
+    char *value = argv[1];
+
+    if (value[0] == '+' || value[0] == '-') {
+        FILE *actual = fopen("actual_brightness", "r");
+        if (!actual) err(EX_IOERR, "actual_brightness");
+
+        unsigned int brightness;
+        int match = fscanf(actual, "%u", &brightness);
+        if (match == EOF) err(EX_IOERR, "actual_brightness");
+        if (match < 1) err(EX_DATAERR, "actual_brightness");
+
+        size_t count = strnlen(value, 15);
+        if (value[0] == '+') {
+            brightness += 16 * count;
+        } else {
+            brightness -= 16 * count;
+        }
+
+        char buf[15];
+        snprintf(buf, sizeof(buf), "%u", brightness);
+
+        value = buf;
+    }
+
+    FILE *brightness = fopen("brightness", "w");
+    if (!brightness) err(EX_IOERR, "brightness");
+
+    int count = fprintf(brightness, "%s", value);
+    if (count < 0) err(EX_IOERR, "brightness");
+
+    return EX_OK;
+}