1 files changed, 249 insertions, 0 deletions
diff --git a/lib/src/rdsrv.c b/lib/src/rdsrv.c
new file mode 100644
index 0000000..52eb19c
--- /dev/null
+++ b/lib/src/rdsrv.c
@@ -0,0 +1,249 @@
+#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 const enum_map_t type_map[] = {
+	{ "once", SVC_ONCE },
+	{ "wait", SVC_WAIT },
+	{ "respawn", SVC_RESPAWN },
+	{ NULL, 0 },
+};
+
+static const enum_map_t target_map[] = {
+	{ "boot", TGT_BOOT },
+	{ "shutdown", TGT_SHUTDOWN },
+	{ "reboot", TGT_REBOOT },
+	{ "ctrlaltdel", TGT_CAD },
+	{ NULL, 0 },
+};
+
+static int srv_name(service_t *srv, char *arg,
+		    const char *filename, size_t lineno)
+{
+	(void)filename; (void)lineno;
+	srv->name = arg;
+	return 0;
+}
+
+static int srv_desc(service_t *srv, char *arg,
+		    const char *filename, size_t lineno)
+{
+	(void)filename; (void)lineno;
+	srv->desc = arg;
+	return 0;
+}
+
+static int srv_tty(service_t *srv, char *arg,
+		   const char *filename, size_t lineno)
+{
+	(void)filename; (void)lineno;
+	srv->ctty = arg;
+	return 0;
+}
+
+static int srv_exec(service_t *srv, char *arg,
+		    const char *filename, size_t lineno)
+{
+	char **new = realloc(srv->exec, sizeof(char*) * (srv->num_exec + 1));
+
+	if (new == NULL) {
+		fprintf(stderr, "%s: %zu: out of memory\n", filename, lineno);
+		free(arg);
+		return -1;
+	}
+
+	srv->exec = new;
+	srv->exec[srv->num_exec++] = arg;
+	return 0;
+}
+
+static int srv_before(service_t *srv, char *arg,
+		      const char *filename, size_t lineno)
+{
+	char **new = realloc(srv->before,
+			     sizeof(char*) * (srv->num_before + 1));
+
+	if (new == NULL) {
+		fprintf(stderr, "%s: %zu: out of memory\n", filename, lineno);
+		free(arg);
+		return -1;
+	}
+
+	srv->before = new;
+	srv->before[srv->num_before++] = arg;
+	return 0;
+}
+
+static int srv_after(service_t *srv, char *arg,
+		     const char *filename, size_t lineno)
+{
+	char **new = realloc(srv->after, sizeof(char*) * (srv->num_after + 1));
+
+	if (new == NULL) {
+		fprintf(stderr, "%s: %zu: out of memory\n", filename, lineno);
+		free(arg);
+		return -1;
+	}
+
+	srv->after = new;
+	srv->after[srv->num_after++] = arg;
+	return 0;
+}
+
+static int srv_type(service_t *srv, char *arg,
+		    const char *filename, size_t lineno)
+{
+	const enum_map_t *ent = enum_by_name(type_map, arg);
+
+	if (ent == NULL) {
+		fprintf(stderr, "%s: %zu: unknown service type '%s'\n",
+			filename, lineno, arg);
+		return -1;
+	}
+
+	srv->type = ent->value;
+	free(arg);
+	return 0;
+}
+
+static int srv_target(service_t *srv, char *arg,
+		      const char *filename, size_t lineno)
+{
+	const enum_map_t *ent = enum_by_name(target_map, arg);
+
+	if (ent == NULL) {
+		fprintf(stderr, "%s: %zu: unknown service target '%s'\n",
+			filename, lineno, arg);
+		return -1;
+	}
+
+	srv->target = ent->value;
+	free(arg);
+	return 0;
+}
+
+
+static const struct {
+	const char *key;
+
+	int (*handle)(service_t *srv, char *arg,
+		      const char *filename, size_t lineno);
+} srv_params[] = {
+	{ "name", srv_name },
+	{ "description", srv_desc },
+	{ "exec", srv_exec },
+	{ "type", srv_type },
+	{ "target", srv_target },
+	{ "tty", srv_tty },
+	{ "before", srv_before },
+	{ "after", srv_after },
+};
+
+
+service_t *rdsrv(int dirfd, const char *filename)
+{
+	const char *arg, *args[1];
+	char *line, *key, *value;
+	size_t i, argc, lineno;
+	service_t *srv;
+	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;
+	}
+
+	srv = calloc(1, sizeof(*srv));
+	if (srv == 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(srv_params); ++i) {
+			if (!strcmp(srv_params[i].key, key))
+				break;
+		}
+
+		if (i >= ARRAY_SIZE(srv_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 (srv_params[i].handle(srv, value, filename, lineno)) {
+			free(value);
+			goto fail_line;
+		}
+
+		free(line);
+	}
+
+	close(fd);
+	return srv;
+fail_line:
+	free(line);
+fail:
+	close(fd);
+	delsrv(srv);
+	return NULL;
+}