k-tana-zero/k/fd.c

#include "fd.h"

static struct file_entry fd_table[MAX_FD] = { 0 };

static int find_next_fd(void)
{
    for (int fd = 0; fd < MAX_FD; ++fd)
    {
        if (!fd_table[fd].open)
            return fd;
    }

    return -1;
}

int register_fd(u32 lba)
{
    int free_fd = find_next_fd();
    if (free_fd < 0)
        return -1;

    struct file_entry f = { .open = 1, .lba = lba, .file_offset = 0 };
    fd_table[free_fd] = f;
    return free_fd;
}

int destroy_fd(int fd)
{
    if (fd > MAX_FD || !fd_table[fd].open)
        return -1;

    fd_table[fd].open = 0;
    fd_table[fd].lba = 0;
    fd_table[fd].file_offset = 0;

    return 0;
}