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-rw-r--r--src/H5L.c186
1 files changed, 169 insertions, 17 deletions
diff --git a/src/H5L.c b/src/H5L.c
index a1f3b6e..9daf948 100644
--- a/src/H5L.c
+++ b/src/H5L.c
@@ -93,6 +93,17 @@ typedef struct {
hid_t dxpl_id; /* Dataset transfer property list */
} H5L_trav_mv2_t;
+/* User data for path traversal routine for checking if a link exists */
+typedef struct {
+ /* Down */
+ char *sep; /* Pointer to next separator in the string */
+ hid_t lapl_id; /* Link access property list */
+ hid_t dxpl_id; /* Dataset transfer property list */
+
+ /* Up */
+ hbool_t exists; /* Whether the link exists or not */
+} H5L_trav_le_t;
+
/* User data for path traversal routine for getting link value */
typedef struct {
size_t size; /* Size of user buffer */
@@ -170,10 +181,13 @@ static herr_t H5L_move_cb(H5G_loc_t *grp_loc/*in*/, const char *name,
static herr_t H5L_move_dest_cb(H5G_loc_t *grp_loc/*in*/, const char *name,
const H5O_link_t *lnk, H5G_loc_t *obj_loc, void *_udata/*in,out*/,
H5G_own_loc_t *own_loc/*out*/);
-static herr_t H5L_exists_cb(H5G_loc_t *grp_loc/*in*/, const char *name,
+static herr_t H5L__exists_final_cb(H5G_loc_t *grp_loc/*in*/, const char *name,
+ const H5O_link_t *lnk, H5G_loc_t *obj_loc, void *_udata/*in,out*/,
+ H5G_own_loc_t *own_loc/*out*/);
+static herr_t H5L__exists_inter_cb(H5G_loc_t *grp_loc/*in*/, const char *name,
const H5O_link_t *lnk, H5G_loc_t *obj_loc, void *_udata/*in,out*/,
H5G_own_loc_t *own_loc/*out*/);
-static htri_t H5L_exists(const H5G_loc_t *loc, const char *name, hid_t lapl_id,
+static htri_t H5L__exists(const H5G_loc_t *loc, const char *name, hid_t lapl_id,
hid_t dxpl_id);
static herr_t H5L_get_info_cb(H5G_loc_t *grp_loc/*in*/, const char *name,
const H5O_link_t *lnk, H5G_loc_t *obj_loc, void *_udata/*in,out*/,
@@ -827,7 +841,7 @@ H5Lexists(hid_t loc_id, const char *name, hid_t lapl_id)
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")
/* Check for the existence of the link */
- if((ret_value = H5L_exists(&loc, name, lapl_id, H5AC_ind_dxpl_id)) < 0)
+ if((ret_value = H5L__exists(&loc, name, lapl_id, H5AC_ind_dxpl_id)) < 0)
HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "unable to get link info")
done:
@@ -2716,9 +2730,10 @@ done:
/*-------------------------------------------------------------------------
- * Function: H5L_exists_cb
+ * Function: H5L__exists_final_cb
*
- * Purpose: Callback for checking whether a link exists
+ * Purpose: Callback for checking whether a link exists, as the final
+ * component of a path
*
* Return: Non-negative on success/Negative on failure
*
@@ -2728,30 +2743,162 @@ done:
*-------------------------------------------------------------------------
*/
static herr_t
-H5L_exists_cb(H5G_loc_t H5_ATTR_UNUSED *grp_loc/*in*/, const char H5_ATTR_UNUSED *name,
+H5L__exists_final_cb(H5G_loc_t H5_ATTR_UNUSED *grp_loc/*in*/, const char H5_ATTR_UNUSED *name,
const H5O_link_t *lnk, H5G_loc_t H5_ATTR_UNUSED *obj_loc, void *_udata/*in,out*/,
H5G_own_loc_t *own_loc/*out*/)
{
- hbool_t *udata = (hbool_t *)_udata; /* User data passed in */
+ H5L_trav_le_t *udata = (H5L_trav_le_t *)_udata; /* User data passed in */
- FUNC_ENTER_NOAPI_NOINIT_NOERR
+ FUNC_ENTER_STATIC_NOERR
/* Check if the name in this group resolved to a valid link */
- *udata = (hbool_t)(lnk != NULL);
+ udata->exists = (hbool_t)(lnk != NULL);
/* Indicate that this callback didn't take ownership of the group *
* location for the object */
*own_loc = H5G_OWN_NONE;
FUNC_LEAVE_NOAPI(SUCCEED)
-} /* end H5L_exists_cb() */
+} /* end H5L__exists_final_cb() */
/*-------------------------------------------------------------------------
- * Function: H5L_exists
+ * Function: H5L__exists_inter_cb
+ *
+ * Purpose: Callback for checking whether a link exists, as an intermediate
+ * component of a path
+ *
+ * Return: Non-negative on success/Negative on failure
+ *
+ * Programmer: Quincey Koziol
+ * Thursday, December 31 2015
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5L__exists_inter_cb(H5G_loc_t H5_ATTR_UNUSED *grp_loc/*in*/, const char H5_ATTR_UNUSED *name,
+ const H5O_link_t *lnk, H5G_loc_t *obj_loc, void *_udata/*in,out*/,
+ H5G_own_loc_t *own_loc/*out*/)
+{
+ H5L_trav_le_t *udata = (H5L_trav_le_t *)_udata; /* User data passed in */
+ herr_t ret_value = SUCCEED; /* Return value */
+
+ FUNC_ENTER_STATIC
+
+ /* Check if the name in this group resolved to a valid link */
+ if(lnk != NULL) {
+ /* Check for more components to the path */
+ if(udata->sep) {
+ H5G_traverse_t cb_func; /* Callback function for tranversal */
+ char *next; /* Pointer to next component name */
+
+ /* Look for another separator */
+ next = udata->sep;
+ if(NULL == (udata->sep = HDstrchr(udata->sep, '/')))
+ cb_func = H5L__exists_final_cb;
+ else {
+ /* Chew through adjacent separators, if present */
+ do {
+ *udata->sep = '\0';
+ udata->sep++;
+ } while('/' == *udata->sep);
+ cb_func = H5L__exists_inter_cb;
+ } /* end else */
+ if(H5G_traverse(obj_loc, next, H5G_TARGET_SLINK | H5G_TARGET_UDLINK, cb_func, udata, udata->lapl_id, udata->dxpl_id) < 0)
+ HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't determine if link exists")
+ } /* end if */
+ else
+ udata->exists = TRUE;
+ } /* end if */
+ else
+ udata->exists = FALSE;
+
+ /* Indicate that this callback didn't take ownership of the group *
+ * location for the object */
+ *own_loc = H5G_OWN_NONE;
+
+done:
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5L__exists_inter_cb() */
+
+
+/*-------------------------------------------------------------------------
+ * Function: H5L_exists_tolerant
*
* Purpose: Returns whether a link exists in a group
*
+ * Note: Same as H5L_exists, except that missing links are reported
+ * as 'FALSE' instead of causing failures
+ *
+ * Return: Non-negative (TRUE/FALSE) on success/Negative on failure
+ *
+ * Programmer: Quincey Koziol
+ * Thursday, December 31 2015
+ *
+ *-------------------------------------------------------------------------
+ */
+htri_t
+H5L_exists_tolerant(const H5G_loc_t *loc, const char *name, hid_t lapl_id, hid_t dxpl_id)
+{
+ H5L_trav_le_t udata; /* User data for traversal */
+ H5G_traverse_t cb_func; /* Callback function for tranversal */
+ char *name_copy = NULL; /* Duplicate of name */
+ char *name_trav; /* Name to traverse */
+ htri_t ret_value = FAIL; /* Return value */
+
+ FUNC_ENTER_NOAPI(FAIL)
+
+ /* Sanity checks */
+ HDassert(loc);
+ HDassert(name);
+
+ /* Copy the name and skip leading '/'s */
+ name_trav = name_copy = H5MM_strdup(name);
+ while('/' == *name_trav)
+ name_trav++;
+
+ /* A path of "/" will always exist in a file */
+ if('\0' == *name_trav)
+ HGOTO_DONE(TRUE)
+
+ /* Set up user data & correct callback */
+ udata.lapl_id = lapl_id;
+ udata.dxpl_id = dxpl_id;
+ udata.exists = FALSE;
+ if(NULL == (udata.sep = HDstrchr(name_trav, '/')))
+ cb_func = H5L__exists_final_cb;
+ else {
+ /* Chew through adjacent separators, if present */
+ do {
+ *udata.sep = '\0';
+ udata.sep++;
+ } while('/' == *udata.sep);
+ cb_func = H5L__exists_inter_cb;
+ } /* end else */
+
+ /* Traverse the group hierarchy to locate the link to check */
+ if(H5G_traverse(loc, name_trav, H5G_TARGET_SLINK | H5G_TARGET_UDLINK, cb_func, &udata, lapl_id, dxpl_id) < 0)
+ HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't determine if link exists")
+
+ /* Set return value */
+ ret_value = (htri_t)udata.exists;
+
+done:
+ /* Release duplicated string */
+ H5MM_xfree(name_copy);
+
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* H5L_exists_tolerant() */
+
+
+/*-------------------------------------------------------------------------
+ * Function: H5L__exists
+ *
+ * Purpose: Returns whether a link exists in a group
+ *
+ * Note: Same as H5L_exists_tolerant, except that missing links are reported
+ * as failures
+ *
* Return: Non-negative (TRUE/FALSE) on success/Negative on failure
*
* Programmer: Quincey Koziol
@@ -2760,23 +2907,28 @@ H5L_exists_cb(H5G_loc_t H5_ATTR_UNUSED *grp_loc/*in*/, const char H5_ATTR_UNUSED
*-------------------------------------------------------------------------
*/
static htri_t
-H5L_exists(const H5G_loc_t *loc, const char *name, hid_t lapl_id, hid_t dxpl_id)
+H5L__exists(const H5G_loc_t *loc, const char *name, hid_t lapl_id, hid_t dxpl_id)
{
- hbool_t exists = FALSE; /* Whether the link exists in the group */
+ H5L_trav_le_t udata; /* User data for traversal */
htri_t ret_value = FAIL; /* Return value */
- FUNC_ENTER_NOAPI_NOINIT
+ FUNC_ENTER_STATIC
+
+ /* A path of "/" will always exist in a file */
+ if(0 == HDstrcmp(name, "/"))
+ HGOTO_DONE(TRUE)
/* Traverse the group hierarchy to locate the object to get info about */
- if(H5G_traverse(loc, name, H5G_TARGET_SLINK|H5G_TARGET_UDLINK, H5L_exists_cb, &exists, lapl_id, dxpl_id) < 0)
+ udata.exists = FALSE;
+ if(H5G_traverse(loc, name, H5G_TARGET_SLINK | H5G_TARGET_UDLINK, H5L__exists_final_cb, &udata, lapl_id, dxpl_id) < 0)
HGOTO_ERROR(H5E_SYM, H5E_EXISTS, FAIL, "path doesn't exist")
/* Set return value */
- ret_value = (htri_t)exists;
+ ret_value = (htri_t)udata.exists;
done:
FUNC_LEAVE_NOAPI(ret_value)
-} /* H5L_exists() */
+} /* H5L__exists() */
/*-------------------------------------------------------------------------
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