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/* wrcc.c (write graph in DIMACS clique/coloring format) */
/***********************************************************************
* This code is part of GLPK (GNU Linear Programming Kit).
*
* Copyright (C) 2009-2016 Andrew Makhorin, Department for Applied
* Informatics, Moscow Aviation Institute, Moscow, Russia. All rights
* reserved. E-mail: <mao@gnu.org>.
*
* GLPK is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GLPK is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
* License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GLPK. If not, see <http://www.gnu.org/licenses/>.
***********************************************************************/
#include "env.h"
#include "glpk.h"
#define xfprintf glp_format
/***********************************************************************
* NAME
*
* glp_write_ccdata - write graph in DIMACS clique/coloring format
*
* SYNOPSIS
*
* int glp_write_ccdata(glp_graph *G, int v_wgt, const char *fname);
*
* DESCRIPTION
*
* The routine glp_write_ccdata writes the specified graph in DIMACS
* clique/coloring format to a text file.
*
* RETURNS
*
* If the operation was successful, the routine returns zero. Otherwise
* it prints an error message and returns non-zero. */
int glp_write_ccdata(glp_graph *G, int v_wgt, const char *fname)
{ glp_file *fp;
glp_vertex *v;
glp_arc *e;
int i, count = 0, ret;
double w;
if (v_wgt >= 0 && v_wgt > G->v_size - (int)sizeof(double))
xerror("glp_write_ccdata: v_wgt = %d; invalid offset\n",
v_wgt);
xprintf("Writing graph to '%s'\n", fname);
fp = glp_open(fname, "w");
if (fp == NULL)
{ xprintf("Unable to create '%s' - %s\n", fname, get_err_msg());
ret = 1;
goto done;
}
xfprintf(fp, "c %s\n",
G->name == NULL ? "unknown" : G->name), count++;
xfprintf(fp, "p edge %d %d\n", G->nv, G->na), count++;
if (v_wgt >= 0)
{ for (i = 1; i <= G->nv; i++)
{ v = G->v[i];
memcpy(&w, (char *)v->data + v_wgt, sizeof(double));
if (w != 1.0)
xfprintf(fp, "n %d %.*g\n", i, DBL_DIG, w), count++;
}
}
for (i = 1; i <= G->nv; i++)
{ v = G->v[i];
for (e = v->out; e != NULL; e = e->t_next)
xfprintf(fp, "e %d %d\n", e->tail->i, e->head->i), count++;
}
xfprintf(fp, "c eof\n"), count++;
#if 0 /* FIXME */
xfflush(fp);
#endif
if (glp_ioerr(fp))
{ xprintf("Write error on '%s' - %s\n", fname, get_err_msg());
ret = 1;
goto done;
}
xprintf("%d lines were written\n", count);
ret = 0;
done: if (fp != NULL) glp_close(fp);
return ret;
}
/**********************************************************************/
int glp_write_graph(glp_graph *G, const char *fname)
{ return
glp_write_ccdata(G, -1, fname);
}
/* eof */
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