src/interp/stack/write.c


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/*
 * 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/log.h>
#include <nw/stack.h>

enum nw_state nwp_stack_write(struct nw_interp *const i,
    struct nw_sm_io *const io, const size_t offset)
{
    const void *const src = (const unsigned char *)io->buf + io->read;
    const struct nw_interp_cfg *const cfg = &i->cfg;
    const struct nw_fifo_cfg *const fc = &cfg->stack;
    const int n = fc->write(offset + io->read, src, io->n - io->read,
        cfg->user);

    if (n < 0)
    {
        static const char *const exc = "failed to write to stack";

#ifdef NW_LOG
        nwp_log("%s\n", exc);
#endif
        i->exception = exc;
        return NW_FATAL;
    }
    else if ((io->read += n) >= io->n)
        return NW_OK;

    return NW_AGAIN;
}