Add helper library for cron configuration

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>

1 files changed, 77 insertions, 0 deletions

diff --git a/lib/cron/cronscan.c b/lib/cron/cronscan.c
new file mode 100644
index 0000000..e28fb03
--- /dev/null
+++ b/lib/cron/cronscan.c
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * Copyright (C) 2018 - David Oberhollenzer
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stddef.h>
+#include <dirent.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <ctype.h>
+
+#include "crontab.h"
+
+int cronscan(const char *directory, crontab_t **list)
+{
+	struct dirent *ent;
+	int dfd, ret = 0;
+	crontab_t *cron;
+	DIR *dir;
+
+	dir = opendir(directory);
+	if (dir == NULL) {
+		perror(directory);
+		return -1;
+	}
+
+	dfd = dirfd(dir);
+	if (dfd < 0) {
+		perror(directory);
+		closedir(dir);
+		return -1;
+	}
+
+	for (;;) {
+		errno = 0;
+		ent = readdir(dir);
+
+		if (ent == NULL) {
+			if (errno != 0) {
+				perror(directory);
+				ret = -1;
+			}
+			break;
+		}
+
+		if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
+			continue;
+
+		cron = rdcron(dfd, ent->d_name);
+		if (cron == NULL) {
+			ret = -1;
+			continue;
+		}
+
+		cron->next = *list;
+		*list = cron;
+	}
+
+	closedir(dir);
+	return ret;
+}