#include <stdlib.h>
#include <assert.h>

#include "driver.h"

int drv_open(const struct driver *drv)
{
    int res = -1;
    assert(drv != NULL);

    if(drv->fp->open) {
        res = drv->fp->open(drv);
    }

    return res;
}

int drv_close(const struct driver *drv)
{
    int res = -1;
    assert(drv != NULL);

    if(drv->fp->close) {
        res = drv->fp->close(drv);
    }

    return res;
}

int drv_read(const struct driver *drv, char *buffer, unsigned int length)
{
    int res = -1;
    assert(drv != NULL);

    if(drv->fp->read) {
        res =  drv->fp->read(drv, buffer, length);
    }

    return res;
}

int drv_write(const struct driver *drv, const char *buffer, unsigned int length)
{
    int res = -1;
    assert(drv != NULL);

    if(drv->fp->write) {
        res =  drv->fp->write(drv, buffer, length);
    }

    return res;
}

int drv_ioctl(const struct driver *drv, unsigned int cmd, unsigned int argc, ...)
{
    int res = -1;
    assert(drv != NULL);

    if(drv->fp->ioctl) {
        va_list args;
        va_start(args, argc);
        res = drv->fp->ioctl(drv, cmd, argc, args);
        va_end(args);
    }

    return res;
}