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ici::doc::pod3::sdrlist(3) ICI library functions ici::doc::pod3::sdrlist(3)
NAME
sdrlist - Simple Data Recorder list management functions
SYNOPSIS
#include "sdr.h"
typedef int (*SdrListCompareFn)(Sdr sdr, Address eltData, void *argData);
typedef void (*SdrListDeleteFn)(Sdr sdr, Object elt, void *argument);
[see description for available functions]
DESCRIPTION
The SDR list management functions manage doubly-linked lists in managed SDR heap space. The functions manage two kinds of objects: lists
and list elements. A list knows how many elements it contains and what its start and end elements are. An element knows what list it
belongs to and the elements before and after it in the list. An element also knows its content, which is normally the SDR Address of some
object in the SDR heap. A list may be sorted, which speeds the process of searching for a particular element.
Object sdr_list_create(Sdr sdr)
Creates a new list object in the SDR; the new list object initially contains no list elements. Returns the address of the new list, or
zero on any error.
void sdr_list_destroy(Sdr sdr, Object list, SdrListDeleteFn fn, void *arg)
Destroys a list, freeing all elements of list. If fn is non-NULL, that function is called once for each freed element; when called, fn
is passed the Address that is the element's data and the argument pointer passed to sdr_list_destroy().
Do not use sdr_free to destroy an SDR list, as this would leave the elements of the list allocated yet unreferenced.
int sdr_list_length(Sdr sdr, Object list)
Returns the number of elements in the list, or -1 on any error.
void sdr_list_user_data_set(Sdr sdr, Object list, Address userData)
Sets the "user data" word of list to userData. Note that userData is nominally an Address but can in fact be any value that occupies a
single word. It is typically used to point to an SDR object that somehow characterizes the list as a whole, such as a name.
Address sdr_list_user_data(Sdr sdr, Object list)
Returns the value of the "user data" word of list, or zero on any error.
Object sdr_list_insert(Sdr sdr, Object list, Address data, SdrListCompareFn fn, void *dataBuffer)
Creates a new list element whose data value is data and inserts that element into the list. If fn is NULL, the new list element is
simply appended to the list; otherwise, the new list element is inserted after the last element in the list whose data value is "less
than or equal to" the data value of the new element (in dataBuffer) according to the collating sequence established by fn. Returns the
address of the newly created element, or zero on any error.
Object sdr_list_insert_first(Sdr sdr, Object list, Address data)
Object sdr_list_insert_last(Sdr sdr, Object list, Address data)
Creates a new element and inserts it at the front/end of the list. This function should not be used to insert a new element into any
ordered list; use sdr_list_insert() instead. Returns the address of the newly created list element on success, or zero on any error.
Object sdr_list_insert_before(Sdr sdr, Object elt, Address data)
Object sdr_list_insert_after(Sdr sdr, Object elt, Address data)
Creates a new element and inserts it before/after the specified list element. This function should not be used to insert a new element
into any ordered list; use sdr_list_insert() instead. Returns the address of the newly created list element, or zero on any error.
void sdr_list_delete(Sdr sdr, Object elt, SdrListDeleteFn fn, void *arg)
Delete elt from the list it is in. If fn is non-NULL, that function will be called upon deletion of elt; when called, that function is
passed the Address that is the list element's data value and the arg pointer passed to sdr_list_delete().
Object sdr_list_first(Sdr sdr, Object list)
Object sdr_list_last(Sdr sdr, Object list)
Returns the address of the first/last element of list, or zero on any error.
Object sdr_list_next(Sdr sdr, Object elt)
Object sdr_list_prev(Sdr sdr, Object elt)
Returns the address of the element following/preceding elt in that element's list, or zero on any error.
Object sdr_list_search(Sdr sdr, Object elt, int reverse, SdrListCompareFn fn, void *dataBuffer);
Search a list for an element whose data matches the data in dataBuffer, starting at the indicated initial list element. If the compare
function is non-NULL, the list is assumed to be sorted in the order implied by that function and the function is automatically called
once for each element of the list until it returns a value that is greater than or equal to zero (where zero indicates an exact match
and a value greater than zero indicates that the list contains no matching element); each time compare is called it is passed the
Address that is the element's data value and the dataBuffer value passed to sm_list_search(). If reverse is non-zero, then the list is
searched in reverse order (starting at the indicated initial list element) and the search ends when compare returns a value that is
less than or equal to zero. If compare is NULL, then the entire list is searched (in either forward or reverse order, as directed)
until an element is located whose data value is equal to ((Address) dataBuffer). Returns the address of the matching element if one is
found, 0 otherwise.
Object sdr_list_list(Sdr sdr, Object elt)
Returns the address of the list to which elt belongs, or 0 on any error.
Address sdr_list_data(Sdr sdr, Object elt)
Returns the Address that is the data value of elt, or 0 on any error.
Address sdr_list_data_set(Sdr sdr, Object elt, Address data)
Sets the data value for elt to data, replacing the original value. Returns the original data value for elt, or 0 on any error. The
original data value for elt may or may not have been the address of an object in heap data space; even if it was, that object was NOT
deleted.
Warning: changing the data value of an element of an ordered list may ruin the ordering of the list.
USAGE
When inserting elements or searching a list, the user may optionally provide a compare function of the form:
int user_comp_name(Sdr sdr, Address eltData, void *dataBuffer);
When provided, this function is automatically called by the sdrlist function being invoked; when the function is called it is passed the
content of a list element (eltData, nominally the Address of an item in the SDR's heap space) and an argument, dataBuffer, which is
nominally the address in local memory of some other item in the same format. The user-supplied function normally compares some key values
of the two data items and returns 0 if they are equal, an integer less than 0 if eltData's key value is less than that of dataBuffer, and
an integer greater than 0 if eltData's key value is greater than that of dataBuffer. These return values will produce a list in ascending
order. If the user desires the list to be in descending order, the function must reverse the signs of these return values.
When deleting an element or destroying a list, the user may optionally provide a delete function of the form:
void user_delete_name(Sdr sdr, Address eltData, void *argData)
When provided, this function is automatically called by the sdrlist function being invoked; when the function is called it is passed the
content of a list element (eltData, nominally the Address of an item in the SDR's heap space) and an argument, argData, which if non-NULL
is normally the address in local memory of a data item providing context for the list element deletion. The user-supplied function
performs any application-specific cleanup associated with deleting the element, such as freeing the element's content data item and/or
other SDR heap space associated with the element.
SEE ALSO
lyst(3), sdr(3), sdrstring(3), sdrtable(3), smlist(3)
perl v5.14.2 2012-05-25 ici::doc::pod3::sdrlist(3)