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include <pkg/mef.h>
# MEF_GNBC -- Get the Number of Blank Cards in a FITS header pointed by
# mef. This is the number of cards available to insert before an expantion by
# one block is required. If the header has not being read and EOF (-2) is
# returned.
int procedure mef_gnbc (mef)
pointer mef
int len, hd, ip, nbc, hsize, k, ncards
int strlen(), strncmp()
begin
if (MEF_HDRP(mef) == NULL)
return (EOF)
hd = MEF_HDRP(mef)
len = strlen(Memc[hd])
# Go to the end of buffer and get last line
ip = hd + MEF_HSIZE(mef) - LEN_CARDNL
# See if line is blank
nbc = 0
while (ip > 0) {
do k = 0, LEN_CARD-1
if (Memc[ip+k] != ' ')
break
if (k != LEN_CARD && k != 0) # blank keyw card
break
else if (k == 0) {
if (strncmp ("END ", Memc[ip], 8) == 0) {
ip = ip - LEN_CARDNL
next
} else
break
} else
nbc = nbc + 1
ip = ip - LEN_CARDNL
}
hsize = MEF_HSIZE(mef)
ncards = (hsize + 80)/81
ncards = ((ncards + 35)/36)*36 - ncards
nbc = nbc + ncards
return (nbc)
end
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