1 /*
2  * Copyright (C) 1998, 2000-2007, 2010, 2011, 2012, 2013 SINTEF ICT,
3  * Applied Mathematics, Norway.
4  *
5  * Contact information: E-mail: tor.dokken@sintef.no
6  * SINTEF ICT, Department of Applied Mathematics,
7  * P.O. Box 124 Blindern,
8  * 0314 Oslo, Norway.
9  *
10  * This file is part of SISL.
11  *
12  * SISL is free software: you can redistribute it and/or modify
13  * it under the terms of the GNU Affero General Public License as
14  * published by the Free Software Foundation, either version 3 of the
15  * License, or (at your option) any later version.
16  *
17  * SISL is distributed in the hope that it will be useful,
18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU Affero General Public License for more details.
21  *
22  * You should have received a copy of the GNU Affero General Public
23  * License along with SISL. If not, see
24  * <http://www.gnu.org/licenses/>.
25  *
26  * In accordance with Section 7(b) of the GNU Affero General Public
27  * License, a covered work must retain the producer line in every data
28  * file that is created or manipulated using SISL.
29  *
30  * Other Usage
31  * You can be released from the requirements of the license by purchasing
32  * a commercial license. Buying such a license is mandatory as soon as you
33  * develop commercial activities involving the SISL library without
34  * disclosing the source code of your own applications.
35  *
36  * This file may be used in accordance with the terms contained in a
37  * written agreement between you and SINTEF ICT.
38  */
39 
40 #include "sisl-copyright.h"
41 
42 /*
43  *
44  * $Id: sh6disconn.c,v 1.1 1994-04-21 12:10:42 boh Exp $
45  *
46  */
47 
48 
49 #define SH6DISCONNECT
50 
51 #include "sislP.h"
52 
53 #if defined(SISLNEEDPROTOTYPES)
54 void
sh6disconnect(SISLIntpt * pt1,SISLIntpt * pt2,int * jstat)55       sh6disconnect(SISLIntpt *pt1,SISLIntpt *pt2,int *jstat)
56 #else
57 void sh6disconnect(pt1,pt2,jstat)
58    SISLIntpt *pt1;
59    SISLIntpt *pt2;
60    int       *jstat;
61 #endif
62 /*
63 *********************************************************************
64 *
65 *********************************************************************
66 *
67 * PURPOSE    : Remove the connection between pt1 and pt2 (which
68 *              must be unique) if any.
69 *
70 * INPUT      : pt1      - First point.
71 *              pt2      - Second point.
72 *              jstat    - Error flag.
73 *                         jstat =  0  => Successful.
74 *                         jstat =  1  => pt1 and pt2 are not connected
75 *                         jstat = -1  => Error in data structure.
76 *
77 *
78 * METHOD     :
79 *
80 * CALLS      : s6err      - Gives error message.
81 *
82 * REFERENCES :
83 *
84 * WRITTEN BY : Michael Floater, SI, Oslo, Norway. June 91.
85 *
86 *********************************************************************
87 */
88 {
89   int kstat;                 /* Local status variable.            */
90   int index1,index2;         /* Indices for pt1 and pt2.          */
91 
92    *jstat = 0;
93 
94 
95    /* Check if pt1 and pt2 are connected. */
96 
97    sh6getlist(pt1,pt2,&index1,&index2,&kstat);
98    if(kstat < 0) goto err1;
99    if(kstat == 1)
100    {
101        *jstat = 1;
102        goto out;
103    }
104 
105 
106    /* Disconnect. */
107 
108    pt1->no_of_curves--;
109    pt1->pnext[index1] = pt1->pnext[pt1->no_of_curves];
110    pt1->curve_dir[index1] = pt1->curve_dir[pt1->no_of_curves];
111 
112    pt2->no_of_curves--;
113    pt2->pnext[index2] = pt2->pnext[pt2->no_of_curves];
114    pt2->curve_dir[index2] = pt2->curve_dir[pt2->no_of_curves];
115 
116 
117   goto out;
118 
119 
120 
121   /* No connection exists. */
122 
123   err1 : *jstat = -1;
124   s6err("sh6disconnect",*jstat,0);
125   goto out;
126 
127   out: ;
128 }
129