minix/lib/libsffs/util.c

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/* This file contains various utility functions.
*
* The entry points into this file are:
* get_name retrieve a path component string from VFS
* do_noop handle file system calls that do nothing and succeed
* no_sys handle file system calls that are not implemented
*
* Created:
* April 2009 (D.C. van Moolenbroek)
*/
#include "inc.h"
/*===========================================================================*
* get_name *
*===========================================================================*/
int get_name(
cp_grant_id_t grant, /* memory grant for the path component */
size_t len, /* length of the name, including '\0' */
char name[NAME_MAX+1] /* buffer in which store the result */
)
{
/* Retrieve a path component from the caller, using a given grant.
*/
int r;
/* Copy in the name of the directory entry. */
if (len <= 1) return EINVAL;
if (len > NAME_MAX+1) return ENAMETOOLONG;
r = sys_safecopyfrom(m_in.m_source, grant, 0, (vir_bytes) name, len);
if (r != OK) return r;
if (name[len-1] != 0) {
printf("%s: VFS did not zero-terminate path component!\n", sffs_name);
return EINVAL;
}
return OK;
}
/*===========================================================================*
* do_noop *
*===========================================================================*/
int do_noop(void)
{
/* Generic handler for no-op system calls.
*/
return OK;
}
/*===========================================================================*
* no_sys *
*===========================================================================*/
int no_sys(void)
{
/* Generic handler for unimplemented system calls.
*/
return ENOSYS;
}