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Autodocs
 Libraries:
 utility.library
  AddNamedObject
  AllocNamedObjectA
  AllocateTagItems
  Amiga2Date
  ApplyTagChanges
  AttemptRemNamedObject
  CallHookPkt
  CheckDate
  CloneTagItems
  Date2Amiga
  FilterTagChanges
  FilterTagItems
  FindNamedObject
  FindTagItem
  FreeNamedObject
  FreeTagItems
  GetTagData
  GetUniqueID
  MapTags
  NamedObjectName
  NextTagItem
  PackBoolTags
  PackStructureTags
  RefreshTagItemClones
  ReleaseNamedObject
  RemNamedObject
  SDivMod32
  SMult32
  SMult64
  Stricmp
  Strnicmp
  TagInArray
  ToLower
  ToUpper
  UDivMod32
  UMult32
  UMult64
  UnpackStructureTags
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GuruMeditation
Docs » Autodocs » utility.library » NextTagItem

NAME

	NextTagItem -- iterate through a tag list. (V36)

SYNOPSIS

	tag = NextTagItem(tagItemPtr);
	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;
	    tstate = tags;
	    while (tag = NextTagItem(&tstate))
	    {
		switch (tag->ti_Tag)
		{
 		    case TAG1: ...
			       break;
 		    case TAG2: ...
			       break;
		    ...
		}
	    }
   	}

WARNING

	Do NOT use the value of *tagItemPtr, but rather use the pointer
	returned by NextTagItem().

SEE ALSO

<utility/tagitem.h>, GetTagData(), PackBoolTags(), FindTagItem()

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