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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include "gks.h"
# GQOPWK -- Inquire number of open work stations. From looking at how this
# procedure is called, it seems to have two functions, depending on the value
# of "n". It returns either the number of active workstations (n=0), or the
# wkid for nth open workstation.
procedure gqopwk (n, errind, ol, wkid)
int n # Number of workstation to query
int errind # Error indicator; errind = 0 means no error
int ol # Returned value (number of open workstations)
int wkid # WKID of nth open workstation - returned
int i, this_wkstation
include "gks.com"
begin
if (gk_std == NULL) {
# GKS not in proper state; no active workstations
errind = 7
wkid = -1
return
} else
errind = 0
if (n < 0 || n > NDEV) {
# Invalid workstation identifier
wkid = -1
errind = 502
return
} else {
ol = 0
if (n == 0) {
# return the number of active workstations
do i = 1, NDEV {
if (gk_status[i] == ACTIVE)
ol = ol + 1
}
} else {
# Find the nth open workstation and return its wkid
this_wkstation = 0
do i = 1, NDEV {
if (gk_status[i] == ACTIVE) {
this_wkstation = this_wkstation + 1
if (this_wkstation == n) {
wkid = i
break
}
}
}
}
}
end
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