1 files changed, 55 insertions, 0 deletions
diff --git a/pkg/xtools/mef/mefgnbc.x b/pkg/xtools/mef/mefgnbc.x
new file mode 100644
index 00000000..2d370893
--- /dev/null
+++ b/pkg/xtools/mef/mefgnbc.x
@@ -0,0 +1,55 @@
+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
+