1 files changed, 251 insertions, 0 deletions
diff --git a/lib/src/rdsvc.c b/lib/src/rdsvc.c
new file mode 100644
index 0000000..972f7e4
--- /dev/null
+++ b/lib/src/rdsvc.c
@@ -0,0 +1,251 @@
+/* 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 <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include "service.h"
+#include "util.h"
+
+static int svc_name(service_t *svc, char *arg,
+		    const char *filename, size_t lineno)
+{
+	(void)filename; (void)lineno;
+	svc->name = arg;
+	return 0;
+}
+
+static int svc_desc(service_t *svc, char *arg,
+		    const char *filename, size_t lineno)
+{
+	(void)filename; (void)lineno;
+	svc->desc = arg;
+	return 0;
+}
+
+static int svc_tty(service_t *svc, char *arg,
+		   const char *filename, size_t lineno)
+{
+	(void)filename; (void)lineno;
+	svc->ctty = arg;
+	return 0;
+}
+
+static int svc_exec(service_t *svc, char *arg,
+		    const char *filename, size_t lineno)
+{
+	char **new = realloc(svc->exec, sizeof(char*) * (svc->num_exec + 1));
+
+	if (new == NULL) {
+		fprintf(stderr, "%s: %zu: out of memory\n", filename, lineno);
+		free(arg);
+		return -1;
+	}
+
+	svc->exec = new;
+	svc->exec[svc->num_exec++] = arg;
+	return 0;
+}
+
+static int svc_before(service_t *svc, char *arg,
+		      const char *filename, size_t lineno)
+{
+	char **new = realloc(svc->before,
+			     sizeof(char*) * (svc->num_before + 1));
+
+	if (new == NULL) {
+		fprintf(stderr, "%s: %zu: out of memory\n", filename, lineno);
+		free(arg);
+		return -1;
+	}
+
+	svc->before = new;
+	svc->before[svc->num_before++] = arg;
+	return 0;
+}
+
+static int svc_after(service_t *svc, char *arg,
+		     const char *filename, size_t lineno)
+{
+	char **new = realloc(svc->after, sizeof(char*) * (svc->num_after + 1));
+
+	if (new == NULL) {
+		fprintf(stderr, "%s: %zu: out of memory\n", filename, lineno);
+		free(arg);
+		return -1;
+	}
+
+	svc->after = new;
+	svc->after[svc->num_after++] = arg;
+	return 0;
+}
+
+static int svc_type(service_t *svc, char *arg,
+		    const char *filename, size_t lineno)
+{
+	int type = svc_type_from_string(arg);
+
+	if (type == -1) {
+		fprintf(stderr, "%s: %zu: unknown service type '%s'\n",
+			filename, lineno, arg);
+		return -1;
+	}
+
+	svc->type = type;
+	free(arg);
+	return 0;
+}
+
+static int svc_target(service_t *svc, char *arg,
+		      const char *filename, size_t lineno)
+{
+	int target = svc_target_from_string(arg);
+
+	if (target == -1) {
+		fprintf(stderr, "%s: %zu: unknown service target '%s'\n",
+			filename, lineno, arg);
+		return -1;
+	}
+
+	svc->target = target;
+	free(arg);
+	return 0;
+}
+
+
+static const struct {
+	const char *key;
+
+	int (*handle)(service_t *svc, char *arg,
+		      const char *filename, size_t lineno);
+} svc_params[] = {
+	{ "name", svc_name },
+	{ "description", svc_desc },
+	{ "exec", svc_exec },
+	{ "type", svc_type },
+	{ "target", svc_target },
+	{ "tty", svc_tty },
+	{ "before", svc_before },
+	{ "after", svc_after },
+};
+
+
+service_t *rdsvc(int dirfd, const char *filename)
+{
+	const char *arg, *args[1];
+	char *line, *key, *value;
+	size_t i, argc, lineno;
+	service_t *svc;
+	int fd;
+
+	fd = openat(dirfd, filename, O_RDONLY);
+	if (fd < 0) {
+		perror(filename);
+		return NULL;
+	}
+
+	arg = strchr(filename, '@');
+	if (arg != NULL) {
+		args[0] = arg + 1;
+		argc = 1;
+	} else {
+		argc = 0;
+	}
+
+	svc = calloc(1, sizeof(*svc));
+	if (svc == NULL) {
+		fputs("out of memory\n", stderr);
+		close(fd);
+		return NULL;
+	}
+
+	for (lineno = 1; ; ++lineno) {
+		errno = 0;
+		line = rdline(fd);
+
+		if (line == NULL) {
+			if (errno != 0) {
+				fprintf(stderr, "read: %s: %zu: %s\n",
+					filename, lineno, strerror(errno));
+				goto fail;
+			}
+			break;
+		}
+
+		if (splitkv(line, &key, &value)) {
+			if (key == NULL) {
+				fprintf(stderr,
+					"%s: %zu: expected <key> = <value>\n",
+					filename, lineno);
+			} else if (value == NULL) {
+				fprintf(stderr,
+					"%s: %zu: expected value after %s\n",
+					filename, lineno, key);
+			} else {
+				fprintf(stderr,
+					"%s: %zu: unexpected arguments "
+					"after key-value pair\n",
+					filename, lineno);
+			}
+			goto fail;
+		}
+
+		if (key == NULL) {
+			free(line);
+			continue;
+		}
+
+		for (i = 0; i < ARRAY_SIZE(svc_params); ++i) {
+			if (!strcmp(svc_params[i].key, key))
+				break;
+		}
+
+		if (i >= ARRAY_SIZE(svc_params)) {
+			fprintf(stderr, "%s: %zu: unknown parameter '%s'\n",
+				filename, lineno, key);
+			goto fail_line;
+		}
+
+		value = strexpand(value, argc, args);
+		if (value == NULL) {
+			fputs("out of memory", stderr);
+			goto fail_line;
+		}
+
+		if (svc_params[i].handle(svc, value, filename, lineno)) {
+			free(value);
+			goto fail_line;
+		}
+
+		free(line);
+	}
+
+	close(fd);
+	return svc;
+fail_line:
+	free(line);
+fail:
+	close(fd);
+	delsvc(svc);
+	return NULL;
+}