minix/lib/libsffs/util.c
David van Moolenbroek ef7b484e5c Create SFFS library out of HGFS
This Shared Folders File System library (libsffs) now contains all the
file system logic originally in HGFS. The actual HGFS server code is
now a stub that passes on all the work to libsffs. The libhgfs library
is changed accordingly.
2012-04-09 18:08:26 +02:00

63 lines
1.7 KiB
C

/* 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(grant, len, 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, D);
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()
{
/* Generic handler for no-op system calls.
*/
return OK;
}
/*===========================================================================*
* no_sys *
*===========================================================================*/
int no_sys()
{
/* Generic handler for unimplemented system calls.
*/
return ENOSYS;
}