First commit

1 files changed, 58 insertions, 0 deletions

diff --git a/src/routines/section/lo.c b/src/routines/section/lo.c
new file mode 100644
index 0000000..aacfa67
--- /dev/null
+++ b/src/routines/section/lo.c
@@ -0,0 +1,58 @@
+/*
+ * nanowasm, a tiny WebAssembly/Wasm interpreter
+ * Copyright (C) 2023-2025  Xavier Del Campo Romero
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include <nanowasm/nw.h>
+#include <nw/interp.h>
+#include <nw/io.h>
+#include <nw/log.h>
+#include <nw/routines.h>
+
+static enum nw_state skip(struct nw_mod *const m)
+{
+    const struct nw_sm_custom *const c = &m->sm.custom;
+    const struct nw_io_cfg *const cfg = &m->cfg.io;
+    const enum nw_state n = cfg->seek(c->start, cfg->user);
+
+    if (n)
+        return n;
+
+    nwp_section_skip(m);
+    return NW_AGAIN;
+}
+
+static enum nw_state get_offset(struct nw_mod *const m)
+{
+    const struct nw_io_cfg *const cfg = &m->cfg.io;
+    const enum nw_state n = cfg->tell(&m->c_sections[NW_CUSTOM_LO], cfg->user);
+
+    if (n)
+        return n;
+
+    m->next = skip;
+    return NW_AGAIN;
+}
+
+static enum nw_state check(struct nw_mod *const m)
+{
+    if (!m->sections[NW_SECTION_CODE])
+    {
+#ifdef NW_LOG
+        nwp_log("code section must be defined first\n");
+#endif
+        return NW_FATAL;
+    }
+
+    m->next = get_offset;
+    return NW_AGAIN;
+}
+
+void nwp_section_lo(struct nw_mod *const m)
+{
+    m->next = check;
+}