/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the files COPYING and Copyright.html. COPYING can be found at the root *
* of the source code distribution tree; Copyright.html can be found at the *
* root level of an installed copy of the electronic HDF5 document set and *
* is linked from the top-level documents page. It can also be found at *
* http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5Plapl.c
* July 14 2006
* James Laird <jlaird@ncsa.uiuc.edu>
*
* Purpose: Link access property list class routines
*
*-------------------------------------------------------------------------
*/
/****************/
/* Module Setup */
/****************/
#define H5P_PACKAGE /*suppress error about including H5Ppkg */
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5Iprivate.h" /* IDs */
#include "H5Lprivate.h" /* Links */
#include "H5MMprivate.h" /* Memory management */
#include "H5Ppkg.h" /* Property lists */
/****************/
/* Local Macros */
/****************/
/* ======== Link access properties ======== */
/* Definitions for number of soft links to traverse */
#define H5L_ACS_NLINKS_SIZE sizeof(size_t)
#define H5L_ACS_NLINKS_DEF H5L_NUM_LINKS /*max symlinks to follow per lookup */
/* Definitions for external link prefix */
#define H5L_ACS_ELINK_PREFIX_SIZE sizeof(char *)
#define H5L_ACS_ELINK_PREFIX_DEF NULL /*default is no prefix */
#define H5L_ACS_ELINK_PREFIX_DEL H5P_lacc_elink_pref_del
#define H5L_ACS_ELINK_PREFIX_COPY H5P_lacc_elink_pref_copy
#define H5L_ACS_ELINK_PREFIX_CLOSE H5P_lacc_elink_pref_close
/******************/
/* Local Typedefs */
/******************/
/********************/
/* Package Typedefs */
/********************/
/********************/
/* Local Prototypes */
/********************/
/* Property class callbacks */
static herr_t H5P_lacc_reg_prop(H5P_genclass_t *pclass);
/* Property list callbacks */
static herr_t H5P_lacc_elink_pref_del(hid_t prop_id, const char* name, size_t size, void* value);
static herr_t H5P_lacc_elink_pref_copy(const char* name, size_t size, void* value);
static herr_t H5P_lacc_elink_pref_close(const char* name, size_t size, void* value);
/*********************/
/* Package Variables */
/*********************/
/* Dataset creation property list class library initialization object */
const H5P_libclass_t H5P_CLS_LACC[1] = {{
"link access", /* Class name for debugging */
&H5P_CLS_ROOT_g, /* Parent class ID */
&H5P_CLS_LINK_ACCESS_g, /* Pointer to class ID */
&H5P_LST_LINK_ACCESS_g, /* Pointer to default property list ID */
H5P_lacc_reg_prop, /* Default property registration routine */
NULL, /* Class creation callback */
NULL, /* Class creation callback info */
NULL, /* Class copy callback */
NULL, /* Class copy callback info */
NULL, /* Class close callback */
NULL /* Class close callback info */
}};
/*****************************/
/* Library Private Variables */
/*****************************/
/*******************/
/* Local Variables */
/*******************/
/*-------------------------------------------------------------------------
* Function: H5P_lacc_reg_prop
*
* Purpose: Register the dataset creation property list class's properties
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* October 31, 2006
*-------------------------------------------------------------------------
*/
static herr_t
H5P_lacc_reg_prop(H5P_genclass_t *pclass)
{
size_t nlinks = H5L_ACS_NLINKS_DEF; /* Default number of soft links to traverse */
char *elink_prefix = H5L_ACS_ELINK_PREFIX_DEF; /* Default external link prefix string */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5P_lacc_reg_prop)
/* Register property for number of links traversed */
if(H5P_register(pclass, H5L_ACS_NLINKS_NAME, H5L_ACS_NLINKS_SIZE,
&nlinks, NULL, NULL, NULL, NULL, NULL, NULL, NULL) < 0)
HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
/* Register property for external link prefix */
if(H5P_register(pclass, H5L_ACS_ELINK_PREFIX_NAME, H5L_ACS_ELINK_PREFIX_SIZE,
&elink_prefix, NULL, NULL, NULL, H5L_ACS_ELINK_PREFIX_DEL, H5L_ACS_ELINK_PREFIX_COPY, NULL, H5L_ACS_ELINK_PREFIX_CLOSE) < 0)
HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5P_lacc_reg_prop() */
/*-------------------------------------------------------------------------
* Function: H5P_lacc_elink_pref_del
*
* Purpose: Frees memory used to store the external link prefix string
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* November 2, 2006
*
*-------------------------------------------------------------------------
*/
/* ARGSUSED */
static herr_t
H5P_lacc_elink_pref_del(hid_t UNUSED prop_id, const char UNUSED *name, size_t UNUSED size, void *value)
{
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5P_lacc_elink_pref_del)
HDassert(value);
H5MM_xfree(*(void **)value);
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5P_lacc_elink_pref_del() */
/*-------------------------------------------------------------------------
* Function: H5P_lacc_elink_pref_copy
*
* Purpose: Creates a copy of the external link prefix string
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* November 2, 2006
*
*-------------------------------------------------------------------------
*/
/* ARGSUSED */
static herr_t
H5P_lacc_elink_pref_copy(const char UNUSED *name, size_t UNUSED size, void *value)
{
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5P_lacc_elink_pref_copy)
HDassert(value);
*(char **)value = H5MM_xstrdup(*(const char **)value);
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5P_lacc_elink_pref_copy() */
/*-------------------------------------------------------------------------
* Function: H5P_lacc_elink_pref_close
*
* Purpose: Frees memory used to store the external link prefix string
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* November 2, 2006
*
*-------------------------------------------------------------------------
*/
/* ARGSUSED */
static herr_t
H5P_lacc_elink_pref_close(const char UNUSED *name, size_t UNUSED size, void *value)
{
FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5P_lacc_elink_pref_close)
HDassert(value);
H5MM_xfree(*(void **)value);
FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5P_lacc_elink_pref_close() */
/*-------------------------------------------------------------------------
* Function: H5Pset_nlinks
*
* Purpose: Set the number of soft or UD link traversals allowed before
* the library assumes it has found a cycle and aborts the
* traversal.
*
* The limit on soft or UD link traversals is designed to
* terminate link traversal if one or more links form a cycle.
* However, users may have a file with a legitimate path
* formed of a large number of soft or user-defined links.
* This property can be used to allow traversal of as many
* links as desired.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: James Laird
* Friday, July 14, 2006
*
*-------------------------------------------------------------------------
*/
herr_t
H5Pset_nlinks(hid_t plist_id, size_t nlinks)
{
H5P_genplist_t *plist; /* Property list pointer */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_API(H5Pset_nlinks, FAIL)
H5TRACE2("e", "iz", plist_id, nlinks);
if(nlinks <= 0)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "number of links must be positive");
/* Get the plist structure */
if(NULL == (plist = H5P_object_verify(plist_id, H5P_LINK_ACCESS)))
HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID")
/* Set number of links */
if(H5P_set(plist, H5L_ACS_NLINKS_NAME, &nlinks) < 0)
HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set nlink info")
done:
FUNC_LEAVE_API(ret_value)
} /* end H5Pset_nlinks() */
/*-------------------------------------------------------------------------
* Function: H5Pget_nlinks
*
* Purpose: Gets the number of soft or user-defined links that can be
* traversed before a failure occurs.
*
* Retrieves the current setting for the nlinks property on
* the given property list.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: James Laird
* Friday, July 14, 2006
*
*-------------------------------------------------------------------------
*/
herr_t
H5Pget_nlinks(hid_t plist_id, size_t *nlinks)
{
H5P_genplist_t *plist; /* Property list pointer */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_API(H5Pget_nlinks, FAIL)
H5TRACE2("e", "i*z", plist_id, nlinks);
if(!nlinks)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid pointer passed in");
/* Get the plist structure */
if(NULL == (plist = H5P_object_verify(plist_id, H5P_LINK_ACCESS)))
HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID")
/* Get the current number of links */
if(H5P_get(plist, H5L_ACS_NLINKS_NAME, nlinks) < 0)
HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get number of links")
done:
FUNC_LEAVE_API(ret_value)
}
/*-------------------------------------------------------------------------
* Function: H5Pset_elink_prefix
*
* Purpose: Set a prefix to be applied to the path of any external links
* traversed. The prefix is appended to the filename stored
* in the external link.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: James Laird
* Thursday, August 3, 2006
*
*-------------------------------------------------------------------------
*/
herr_t
H5Pset_elink_prefix(hid_t plist_id, const char *prefix)
{
H5P_genplist_t *plist; /* Property list pointer */
char *my_prefix; /* Copy of prefix string */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_API(H5Pset_elink_prefix, FAIL)
H5TRACE2("e", "i*s", plist_id, prefix);
/* Get the plist structure */
if(NULL == (plist = H5P_object_verify(plist_id, H5P_LINK_ACCESS)))
HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID")
/* Get current prefix value */
if(H5P_get(plist, H5L_ACS_ELINK_PREFIX_NAME, &my_prefix) < 0)
HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get prefix info")
/* Free existing prefix, if there is one */
H5MM_xfree(my_prefix);
/* Make a copy of the user's prefix string */
if(NULL == (my_prefix = H5MM_xstrdup(prefix)))
HGOTO_ERROR(H5E_PLIST, H5E_CANTCOPY, FAIL, "can't copy prefix")
/* Set prefix */
if(H5P_set(plist, H5L_ACS_ELINK_PREFIX_NAME, &my_prefix) < 0)
HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set prefix info")
done:
FUNC_LEAVE_API(ret_value)
} /* end H5Pset_elink_prefix() */
/*-------------------------------------------------------------------------
* Function: H5Pget_elink_prefix
*
* Purpose: Gets the prefix to be applied to any external link
* traversals made using this property list.
*
* If the pointer is not NULL, it points to a user-allocated
* buffer.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: James Laird
* Thursday, August 3, 2006
*
*-------------------------------------------------------------------------
*/
ssize_t
H5Pget_elink_prefix(hid_t plist_id, char *prefix, size_t size)
{
H5P_genplist_t *plist; /* Property list pointer */
char *my_prefix; /* Library's copy of the prefix */
size_t len; /* Length of prefix string */
ssize_t ret_value; /* Return value */
FUNC_ENTER_API(H5Pget_elink_prefix, FAIL)
H5TRACE3("Zs", "i*sz", plist_id, prefix, size);
/* Get the plist structure */
if(NULL == (plist = H5P_object_verify(plist_id, H5P_LINK_ACCESS)))
HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID")
/* Get the current prefix */
if(H5P_get(plist, H5L_ACS_ELINK_PREFIX_NAME, &my_prefix) < 0)
HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get external link prefix")
/* Check for prefix being set */
if(my_prefix) {
/* Copy to user's buffer, if given */
len = HDstrlen(my_prefix);
if(prefix) {
HDstrncpy(prefix, my_prefix, MIN(len + 1, size));
if(len >= size)
prefix[size - 1] = '\0';
} /* end if */
} /* end if */
else
len = 0;
/* Set return value */
ret_value = (ssize_t)len;
done:
FUNC_LEAVE_API(ret_value)
} /* end H5Pget_elink_prefix() */