First commit

1 files changed, 31 insertions, 0 deletions

diff --git a/src/io/read.c b/src/io/read.c
new file mode 100644
index 0000000..d4222b5
--- /dev/null
+++ b/src/io/read.c
@@ -0,0 +1,31 @@
+/*
+ * 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/io.h>
+#include <stddef.h>
+
+enum nw_state nwp_io_read(const struct nw_io_cfg *const cfg,
+    struct nw_sm_io *const io, void *const user)
+{
+    void *const buf = (unsigned char *)io->buf + io->read;
+    const size_t rem = io->n - io->read;
+    const int n = cfg->read(buf, rem, user);
+
+    if (n < 0 || (!n && cfg->eof(user)))
+        return NW_FATAL;
+
+    if ((io->read += n) >= io->n)
+    {
+        io->read = 0;
+        return NW_OK;
+    }
+
+    return NW_AGAIN;
+}