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.TH "INQUIRE LIST OF EDGE INDICES" 3P "29 February 1991"
.SH NAME
INQUIRE LIST OF EDGE INDICES\- inquire list of edge indices
defined on a workstation
.SH SYNOPSIS
.SS C Syntax
.ft B
.ta 1.25i 3i
.nf
void
pinq_list_edge_inds ( ws, length, start, error_ind, indices, total_length )
Pint	ws;	\fIworkstation identifier\fP
Pint	length;	\fIlength of application list\fP
Pint	start;	\fIstarting position\fP
Pint	*error_ind;	\fIOUT error indicator\fP
Pint_list	*indices;	\fIOUT list of edge indices\fP
Pint	*total_length;	\fIOUT length of list in PHIGS\fP
.fi
.ft R
.SS Required PHIGS Operating States
(PHOP, WSOP, *, *)
.SH DESCRIPTION
.SS Purpose
Use \s-2INQUIRE LIST OF EDGE INDICES\s+2 to obtain a list of the
currently defined edge indices on the specified workstation.  
The defined edge table indices are \fIconceptually sparse\fP:  a \s-2PHIGS\s+2
implementation could allow definition of \fIn\fP edge representations
with arbitrary indices.  
However, edge indices are \fInonsparse\fP in \s-2PEX-SI\s0:  
the \fIn\fP edge representations necessarily have indices 1 through \fIn\fP.
.SS C Input Parameters
.IP \fIws\fP
\fIWorkstation identifier\fP of the workstation
whose edge indices are to be returned.
.IP \fIlength\fP
Number of items for which the application has allocated memory
in the output parameter \fIindices\fP.  
Specify 0 to get the \fItotal length\fP of the list.  
.IP \fIstart\fP
Starting position in the list at which to begin the inquiry.  
.SS C Output Parameters
.IP \fIerror_ind\fP
Pointer to the location for storing the error number of any error
this function detects.  
.IP \fIindices\fP
Pointer to a Pint_list structure
in which the system returns the portion of the
list of currently defined edge indices,
starting at the entry specified with \fIstart\fP.
.IP
Pint_list is defined in phigs.h as follows:
.nf
.ta .5i +\w'Pint     'u +\w'num_ints;     'u
.sp .4
typedef struct {
.sp .2
	Pint	num_ints;	/* number of Pints in list */
	Pint	*ints;	/* list of integers */
.fi
.sp .2
} Pint_list;
.sp .5
Pointer \fIindices\fR\(->\fIints\fR must be initialized to an array of
\fIlength\fP \fIPint\fP elements.
.IP \fItotal_length\fP
Pointer to an integer in which to return the total length of
the list.  
This is the value required for \fIlength\fP if all the items in the
list are to be returned.  
.SH ERRORS
.IP 003
Ignoring function, function requires state 
(\s-2PHOP\s+2, \s-2WSOP\s+2, \s-2*\s+2, \s-2*\s+2)
.IP 054
Ignoring function, specified workstation is not open
.IP 059
Ignoring function, specified workstation does not have output capability
(in other words, the workstation category is neither  
\s-2OUTPUT\s+2, \s-2OUTIN\s+2, nor \s-2MO\s+2)
.SH SEE ALSO
.IP
.ta 0.5i
.SM "SET EDGE REPRESENTATION (3P)"
.br
.SM "INQUIRE EDGE REPRESENTATION (3P)"