/*
 * Copyright (c) 2023 Rumbledethumps
 *
 * SPDX-License-Identifier: Zlib
 * SPDX-License-Identifier: BSD-3-Clause
 * SPDX-License-Identifier: Unlicense
 */

#include <rp6502.h>
#include <unistd.h>

int __fastcall__ read(int fildes, void *buf, unsigned count)
{
    int total = 0;
    while (count)
    {
        unsigned blockcount = (count > 256) ? 256 : count;
        int bytes_read = read_xstack(&((char *)buf)[total], blockcount, fildes);
        if (bytes_read < 0)
        {
            return bytes_read;
        }
        total += bytes_read;
        count -= bytes_read;
        if (bytes_read < blockcount)
        {
            break;
        }
    }
    return total;
}