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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <syserr.h>
include <ctype.h>
include "idb.h"
# IMGSTR -- Get an image header parameter of type string. If the named
# parameter is a standard parameter return the value directly, else scan
# the user area for the named parameter and decode the value. A special
# check is required for embedded single quotes as per the FITS standard.
procedure imgstr (im, key, outstr, maxch)
pointer im # image descriptor
char key[ARB] # parameter to be returned
char outstr[ARB] # output string to receive parameter value
int maxch
pointer rp
int ip, op
int idb_getstring(), idb_findrecord(), ctowrd(), strlen()
errchk syserrs
begin
# Check for a standard header parameter first.
if (idb_getstring (im, key, outstr, maxch) != ERR)
return
# Find the record.
if (idb_findrecord (im, key, rp) == 0)
call syserrs (SYS_IDBKEYNF, key)
ip = IDB_STARTVALUE
if (ctowrd (Memc[rp], ip, outstr, maxch) > 0) {
# Check for embedded single quotes which are represented as ''.
repeat {
if (Memc[rp+ip-1] != '\'')
break
call strcat ("'", outstr, maxch)
op = strlen (outstr) + 1
if (ctowrd (Memc[rp], ip, outstr[op], maxch-op) == 0)
break
}
# Strip trailing whitespace.
op = strlen (outstr)
while (op > 0 && (IS_WHITE(outstr[op]) || outstr[op] == '\n'))
op = op - 1
outstr[op+1] = EOS
} else
outstr[1] = EOS
end
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