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NAME
- NextTagItem
-
iterate through a tag list. (V36)
SYNOPSIS
tag = NextTagItem(tagItemPtr);
D0 A0
struct TagItem *NextTagItem(struct TagItem **);
D0 A0
struct TagItem *NextTagItem(struct TagItem **);
FUNCTION
Iterates through a tag list, skipping and chaining as dictated by system tags. TAG_SKIP will cause it to skip the entry and a number of following tags as specified in ti_Data. TAG_IGNORE ignores that single entry, and TAG_MORE has a pointer to another array of tags (and terminates the current array!). TAG_DONE also terminates the current array. Each call returns either the next tagitem you should examine, or NULL when the end of the list has been reached.
INPUTS
- tagItemPtr
-
doubly-indirect reference to a TagItem structure. The pointer will be changed to keep track of the iteration.
RESULT
- nextTag
-
each TagItem in the array or chain of arrays that should be processed according to system tag values defined in <utility/tagitem.h>) is returned in turn with successive calls.
EXAMPLE
Iterate(struct TagItem *tags);
{
struct TagItem *tstate;
struct TagItem *tag;
}
{
struct TagItem *tstate;
struct TagItem *tag;
tstate = tags;
while (tag = NextTagItem(&tstate))
{
}
while (tag = NextTagItem(&tstate))
{
switch (tag->ti_Tag)
{
}
{
case TAG1: ...
case TAG2: ...
...
break;
break;
WARNING
Do NOT use the value of *tagItemPtr, but rather use the pointer returned by NextTagItem().