Add helper library for cron configuration

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

1 files changed, 83 insertions, 0 deletions

diff --git a/lib/libcfg/rdcfg.c b/lib/libcfg/rdcfg.c
new file mode 100644
index 0000000..71a994f
--- /dev/null
+++ b/lib/libcfg/rdcfg.c
@@ -0,0 +1,83 @@
+/* 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 "libcfg.h"
+
+#include <string.h>
+#include <stdio.h>
+
+static const cfg_param_t *find_param(rdline_t *rd, const char *name,
+				     const cfg_param_t *params, size_t count)
+{
+	size_t i;
+
+	for (i = 0; i < count; ++i) {
+		if (!strcmp(params[i].key, name))
+			return params + i;
+	}
+
+	fprintf(stderr, "%s: %zu: unknown keyword '%s'\n",
+		rd->filename, rd->lineno, name);
+	return NULL;
+}
+
+int rdcfg(void *cfgobj, rdline_t *rd, const cfg_param_t *params, size_t count,
+	  int flags)
+{
+	const cfg_param_t *p;
+	char *key, *value;
+	int ret;
+
+	while ((ret = rdline(rd)) == 0) {
+		if (splitkv(rd, &key, &value))
+			return -1;
+
+		p = find_param(rd, key, params, count);
+		if (p == NULL)
+			return -1;
+
+		if (p->allow_block && *value == '{') {
+			for (++value; *value == ' '; ++value)
+				;
+
+			if (*value != '\0') {
+				ret = p->handle(cfgobj, value, rd, flags);
+				if (ret)
+					return -1;
+			}
+
+			while ((ret = rdline(rd)) == 0) {
+				if (strcmp(rd->buffer, "}") == 0)
+					break;
+				if (p->handle(cfgobj, rd->buffer, rd, flags))
+					return -1;
+			}
+
+			if (ret < 0)
+				return -1;
+			if (ret > 0)
+				goto fail_bra;
+		} else if (p->handle(cfgobj, value, rd, flags)) {
+			return -1;
+		}
+	}
+
+	return ret < 0 ? -1 : 0;
+fail_bra:
+	fprintf(stderr, "%s: missing '}' before end-of-file\n", rd->filename);
+	return -1;
+}