1 files changed, 32 insertions, 0 deletions
diff --git a/src/io/read.c b/src/io/read.c
new file mode 100644
index 0000000..f8ee1b2
--- /dev/null
+++ b/src/io/read.c
@@ -0,0 +1,32 @@
+/*
+ * wip, a small TCP/IP stack.
+ * Copyright (C) 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 <wip/wip.h>
+#include <wip/prv/io.h>
+
+enum wip_state wip_io_read(struct wip *const w, struct wip_sm_io *const io)
+{
+    void *const buf = (unsigned char *)io->buf + io->read;
+    const struct wip_cfg *const cfg = &w->cfg;
+    const size_t rem = io->n - io->read;
+    const int n = cfg->read(buf, rem, cfg->user);
+
+    if (n < 0)
+    {
+        w->exception = "read error";
+        return WIP_FATAL;
+    }
+    else if ((io->read += n) >= io->n)
+    {
+        io->read = 0;
+        return WIP_OK;
+    }
+
+    return WIP_AGAIN;
+}