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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <syserr.h>
include "qpoe.h"
# QP_GSTR -- Return the string value of the named parameter.
int procedure qp_gstr (qp, param, outstr, maxch)
pointer qp #I QPOE descriptor
char param[ARB] #I parameter name
char outstr[maxch] #O receives string value
int maxch #I max chars out
pointer sym, fm
int nchars, fd
pointer qp_gpsym()
int fm_getfd(), read()
errchk qp_bind, qp_gpsym, syserrs, fm_getfd, seek
begin
if (QP_ACTIVE(qp) == NO)
call qp_bind (qp)
fm = QP_FM(qp)
# Lookup the symbol in the symbol table.
sym = qp_gpsym (qp, param)
if (sym == NULL)
call syserrs (SYS_QPUKNPAR, param)
else if (!(S_DTYPE(sym) == TY_CHAR || S_DTYPE(sym) == TY_USER))
call syserrs (SYS_QPBADCONV, param)
# Fetch the string value from the lfile where the data is stored.
fd = fm_getfd (fm, S_LFILE(sym), READ_ONLY, 0)
call seek (fd, S_OFFSET(sym))
nchars = max (0, read (fd, outstr, min(S_NELEM(sym),maxch)))
outstr[nchars+1] = EOS
call fm_retfd (fm, S_LFILE(sym))
return (nchars)
end
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