1 files changed, 97 insertions, 0 deletions
diff --git a/lib/common/src/fstree_cli.c b/lib/common/src/fstree_cli.c
new file mode 100644
index 0000000..179a1f5
--- /dev/null
+++ b/lib/common/src/fstree_cli.c
@@ -0,0 +1,97 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * fstree_cli.c
+ *
+ * Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "common.h"
+#include "util/util.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+enum {
+	DEF_UID = 0,
+	DEF_GID,
+	DEF_MODE,
+	DEF_MTIME,
+};
+
+static const char *defaults[] = {
+	[DEF_UID] = "uid",
+	[DEF_GID] = "gid",
+	[DEF_MODE] = "mode",
+	[DEF_MTIME] = "mtime",
+	NULL
+};
+
+int parse_fstree_defaults(fstree_defaults_t *sb, char *subopts)
+{
+	char *value;
+	long lval;
+	int i;
+
+	memset(sb, 0, sizeof(*sb));
+	sb->mode = S_IFDIR | 0755;
+	sb->mtime = get_source_date_epoch();
+
+	if (subopts == NULL)
+		return 0;
+
+	while (*subopts != '\0') {
+		i = getsubopt(&subopts, (char *const *)defaults, &value);
+
+		if (value == NULL) {
+			fprintf(stderr, "Missing value for option %s\n",
+				defaults[i]);
+			return -1;
+		}
+
+		switch (i) {
+		case DEF_UID:
+			lval = strtol(value, NULL, 0);
+			if (lval < 0)
+				goto fail_uv;
+			if (lval > (long)INT32_MAX)
+				goto fail_ov;
+			sb->uid = lval;
+			break;
+		case DEF_GID:
+			lval = strtol(value, NULL, 0);
+			if (lval < 0)
+				goto fail_uv;
+			if (lval > (long)INT32_MAX)
+				goto fail_ov;
+			sb->gid = lval;
+			break;
+		case DEF_MODE:
+			lval = strtol(value, NULL, 0);
+			if (lval < 0)
+				goto fail_uv;
+			if (lval > 07777)
+				goto fail_ov;
+			sb->mode = S_IFDIR | (sqfs_u16)lval;
+			break;
+		case DEF_MTIME:
+			lval = strtol(value, NULL, 0);
+			if (lval < 0)
+				goto fail_uv;
+			if (lval > (long)UINT32_MAX)
+				goto fail_ov;
+			sb->mtime = lval;
+			break;
+		default:
+			fprintf(stderr, "Unknown option '%s'\n", value);
+			return -1;
+		}
+	}
+	return 0;
+fail_uv:
+	fprintf(stderr, "%s: value must be positive\n", defaults[i]);
+	return -1;
+fail_ov:
+	fprintf(stderr, "%s: value too large\n", defaults[i]);
+	return -1;
+}