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Title: cardfind
NAME
====
ft_cardfind,ft_cardfindidx,ft_cardfindseq -Fitsy FITS card find routines.
SYNOPSIS
========
-
FITSCard ft_cardfind(FITSHead fits, FITSCard key, int add);
FITSCard ft_cardfindidx(FITSHead fits, FITSCard key, int *match);
FITSCard ft_cardfindseq(FITSHead fits, FITSCard key, int *match);
-
PARAMETERS
==========
* #"FITSHead fits" - The FITS header to look in.
* #"FITSCard key" - The card keyword to lookup.
* #"int add" - If add is true the card will
be added to the header if it is
not found.
* #"int *match" - Returns true if the card found is
an exact match for the keyword requested.
DESCRIPTION
===========
Routines to find FITS cards in a FITS headers data structure.
ft_cardfind
-----------
Find a FITS card in the header.
#cardfind will use the index if is has been created otherwise
it searches sequentially through the header to find the card.
ft_cardfindidx
--------------
Find a FITS card in the header using an index.
If the header is not indexed an index is created for it.
ft_cardfindseq
--------------
Find a card in the FITS header using sequential search.
If the requested card is a FITS indexed keyword and an exact match
is not found, the last card of that type is returned and
match is set to 0.
EXAMPLES
========
+
/* Declair some fitsy types.
*-/
#FITSHead fits;
#FITSCard foo;
#FITSCard goo;
#FITSBuff key;
/* Look up a card using sequential search.
*-/
#ft_cardkey(key, "FOO");
foo = #ft_cardfind(fits, key, 0);
/* This is the same thing. But the card is added to the header
if it isn't found. This will also invalidate the index if
there is one.
*-/
#ft_cardkey(key, "FOO");
foo = #ft_cardfind(fits, key, 1);
/* Now index the header so that searches are faster. #ft_cardfind
will automatically use the index if its valid.
*-/
#ft_index(fits);
#ft_cardkey(key, "GOO", 0);
goo = #ft_cardfind(fits, key, 0);
+
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