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#include "fsdriver.h"
/*
* Copy data from the caller into the local address space.
*/
int
fsdriver_copyin(const struct fsdriver_data * data, size_t off, void * ptr,
size_t len)
{
/* Do nothing for peek requests. */
if (data == NULL)
return OK;
/* The data size field is used only for this integrity check. */
if (off + len > data->size)
panic("fsdriver: copy-in buffer overflow");
if (data->endpt == SELF) {
memcpy(ptr, &data->ptr[off], len);
return OK;
}
return sys_safecopyfrom(data->endpt, data->grant, off, (vir_bytes)ptr,
(phys_bytes)len);
}
/*
* Copy data from the local address space to the caller.
*/
int
fsdriver_copyout(const struct fsdriver_data * data, size_t off,
const void * ptr, size_t len)
{
/* Do nothing for peek requests. */
if (data == NULL)
return OK;
/* The data size field is used only for this integrity check. */
if (off + len > data->size)
panic("fsdriver: copy-out buffer overflow");
if (data->endpt == SELF) {
memcpy(&data->ptr[off], ptr, len);
return OK;
}
return sys_safecopyto(data->endpt, data->grant, off, (vir_bytes)ptr,
(phys_bytes)len);
}
/*
* Zero out a data region in the caller.
*/
int
fsdriver_zero(const struct fsdriver_data * data, size_t off, size_t len)
{
/* Do nothing for peek requests. */
if (data == NULL)
return OK;
/* The data size field is used only for this integrity check. */
if (off + len > data->size)
panic("fsdriver: copy-out buffer overflow");
if (data->endpt == SELF) {
memset(&data->ptr[off], 0, len);
return OK;
}
return sys_safememset(data->endpt, data->grant, off, 0, len);
}
/*
* Copy in a null-terminated name, and perform sanity checks.
*/
int
fsdriver_getname(endpoint_t endpt, cp_grant_id_t grant, size_t len,
char * name, size_t size, int not_empty)
{
int r;
/* The given length includes the null terminator. */
if (len == 0 || (not_empty && len == 1))
return EINVAL;
if (len > size)
return ENAMETOOLONG;
if ((r = sys_safecopyfrom(endpt, grant, 0, (vir_bytes)name,
(phys_bytes)len)) != OK)
return r;
if (name[len - 1] != 0) {
printf("fsdriver: name not null-terminated\n");
return EINVAL;
}
return OK;
}
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