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glpdmx.c
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/* glpdmx.c (reading/writing data in DIMACS format) */
/***********************************************************************
* This code is part of GLPK (GNU Linear Programming Kit).
*
* Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
* 2009, 2010, 2011, 2013 Andrew Makhorin, Department for Applied
* Informatics, Moscow Aviation Institute, Moscow, Russia. All rights
* reserved. E-mail: <[email protected]>.
*
* 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/>.
***********************************************************************/
#define _GLPSTD_STDIO
#include "glpapi.h"
struct csa
{ /* common storage area */
jmp_buf jump;
/* label for go to in case of error */
const char *fname;
/* name of input text file */
XFILE *fp;
/* stream assigned to input text file */
int count;
/* line count */
int c;
/* current character */
char field[255+1];
/* data field */
int empty;
/* warning 'empty line ignored' was printed */
int nonint;
/* warning 'non-integer data detected' was printed */
};
static void error(struct csa *csa, const char *fmt, ...)
{ /* print error message and terminate processing */
va_list arg;
xprintf("%s:%d: error: ", csa->fname, csa->count);
va_start(arg, fmt);
xvprintf(fmt, arg);
va_end(arg);
xprintf("\n");
longjmp(csa->jump, 1);
/* no return */
}
static void warning(struct csa *csa, const char *fmt, ...)
{ /* print warning message and continue processing */
va_list arg;
xprintf("%s:%d: warning: ", csa->fname, csa->count);
va_start(arg, fmt);
xvprintf(fmt, arg);
va_end(arg);
xprintf("\n");
return;
}
static void read_char(struct csa *csa)
{ /* read character from input text file */
int c;
if (csa->c == '\n') csa->count++;
c = xfgetc(csa->fp);
if (c < 0)
{ if (xferror(csa->fp))
error(csa, "read error - %s", xerrmsg());
else if (csa->c == '\n')
error(csa, "unexpected end of file");
else
{ warning(csa, "missing final end of line");
c = '\n';
}
}
else if (c == '\n')
;
else if (isspace(c))
c = ' ';
else if (iscntrl(c))
error(csa, "invalid control character 0x%02X", c);
csa->c = c;
return;
}
static void read_designator(struct csa *csa)
{ /* read one-character line designator */
xassert(csa->c == '\n');
read_char(csa);
for (;;)
{ /* skip preceding white-space characters */
while (csa->c == ' ')
read_char(csa);
if (csa->c == '\n')
{ /* ignore empty line */
if (!csa->empty)
{ warning(csa, "empty line ignored");
csa->empty = 1;
}
read_char(csa);
}
else if (csa->c == 'c')
{ /* skip comment line */
while (csa->c != '\n')
read_char(csa);
read_char(csa);
}
else
{ /* hmm... looks like a line designator */
csa->field[0] = (char)csa->c, csa->field[1] = '\0';
/* check that it is followed by a white-space character */
read_char(csa);
if (!(csa->c == ' ' || csa->c == '\n'))
error(csa, "line designator missing or invalid");
break;
}
}
return;
}
static void read_field(struct csa *csa)
{ /* read data field */
int len = 0;
/* skip preceding white-space characters */
while (csa->c == ' ')
read_char(csa);
/* scan data field */
if (csa->c == '\n')
error(csa, "unexpected end of line");
while (!(csa->c == ' ' || csa->c == '\n'))
{ if (len == sizeof(csa->field)-1)
error(csa, "data field `%.15s...' too long", csa->field);
csa->field[len++] = (char)csa->c;
read_char(csa);
}
csa->field[len] = '\0';
return;
}
static void end_of_line(struct csa *csa)
{ /* skip white-space characters until end of line */
while (csa->c == ' ')
read_char(csa);
if (csa->c != '\n')
error(csa, "too many data fields specified");
return;
}
static void check_int(struct csa *csa, double num)
{ /* print a warning if non-integer data are detected */
if (!csa->nonint && num != floor(num))
{ warning(csa, "non-integer data detected");
csa->nonint = 1;
}
return;
}
/***********************************************************************
* NAME
*
* glp_read_mincost - read min-cost flow problem data in DIMACS format
*
* SYNOPSIS
*
* int glp_read_mincost(glp_graph *G, int v_rhs, int a_low, int a_cap,
* int a_cost, const char *fname);
*
* DESCRIPTION
*
* The routine glp_read_mincost reads minimum cost flow problem data in
* DIMACS format from 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_read_mincost(glp_graph *G, int v_rhs, int a_low, int a_cap,
int a_cost, const char *fname)
{ struct csa _csa, *csa = &_csa;
glp_vertex *v;
glp_arc *a;
int i, j, k, nv, na, ret = 0;
double rhs, low, cap, cost;
char *flag = NULL;
if (v_rhs >= 0 && v_rhs > G->v_size - (int)sizeof(double))
xerror("glp_read_mincost: v_rhs = %d; invalid offset\n",
v_rhs);
if (a_low >= 0 && a_low > G->a_size - (int)sizeof(double))
xerror("glp_read_mincost: a_low = %d; invalid offset\n",
a_low);
if (a_cap >= 0 && a_cap > G->a_size - (int)sizeof(double))
xerror("glp_read_mincost: a_cap = %d; invalid offset\n",
a_cap);
if (a_cost >= 0 && a_cost > G->a_size - (int)sizeof(double))
xerror("glp_read_mincost: a_cost = %d; invalid offset\n",
a_cost);
glp_erase_graph(G, G->v_size, G->a_size);
if (setjmp(csa->jump))
{ ret = 1;
goto done;
}
csa->fname = fname;
csa->fp = NULL;
csa->count = 0;
csa->c = '\n';
csa->field[0] = '\0';
csa->empty = csa->nonint = 0;
xprintf("Reading min-cost flow problem data from `%s'...\n",
fname);
csa->fp = xfopen(fname, "r");
if (csa->fp == NULL)
{ xprintf("Unable to open `%s' - %s\n", fname, xerrmsg());
longjmp(csa->jump, 1);
}
/* read problem line */
read_designator(csa);
if (strcmp(csa->field, "p") != 0)
error(csa, "problem line missing or invalid");
read_field(csa);
if (strcmp(csa->field, "min") != 0)
error(csa, "wrong problem designator; `min' expected");
read_field(csa);
if (!(str2int(csa->field, &nv) == 0 && nv >= 0))
error(csa, "number of nodes missing or invalid");
read_field(csa);
if (!(str2int(csa->field, &na) == 0 && na >= 0))
error(csa, "number of arcs missing or invalid");
xprintf("Flow network has %d node%s and %d arc%s\n",
nv, nv == 1 ? "" : "s", na, na == 1 ? "" : "s");
if (nv > 0) glp_add_vertices(G, nv);
end_of_line(csa);
/* read node descriptor lines */
flag = xcalloc(1+nv, sizeof(char));
memset(&flag[1], 0, nv * sizeof(char));
if (v_rhs >= 0)
{ rhs = 0.0;
for (i = 1; i <= nv; i++)
{ v = G->v[i];
memcpy((char *)v->data + v_rhs, &rhs, sizeof(double));
}
}
for (;;)
{ read_designator(csa);
if (strcmp(csa->field, "n") != 0) break;
read_field(csa);
if (str2int(csa->field, &i) != 0)
error(csa, "node number missing or invalid");
if (!(1 <= i && i <= nv))
error(csa, "node number %d out of range", i);
if (flag[i])
error(csa, "duplicate descriptor of node %d", i);
read_field(csa);
if (str2num(csa->field, &rhs) != 0)
error(csa, "node supply/demand missing or invalid");
check_int(csa, rhs);
if (v_rhs >= 0)
{ v = G->v[i];
memcpy((char *)v->data + v_rhs, &rhs, sizeof(double));
}
flag[i] = 1;
end_of_line(csa);
}
xfree(flag), flag = NULL;
/* read arc descriptor lines */
for (k = 1; k <= na; k++)
{ if (k > 1) read_designator(csa);
if (strcmp(csa->field, "a") != 0)
error(csa, "wrong line designator; `a' expected");
read_field(csa);
if (str2int(csa->field, &i) != 0)
error(csa, "starting node number missing or invalid");
if (!(1 <= i && i <= nv))
error(csa, "starting node number %d out of range", i);
read_field(csa);
if (str2int(csa->field, &j) != 0)
error(csa, "ending node number missing or invalid");
if (!(1 <= j && j <= nv))
error(csa, "ending node number %d out of range", j);
read_field(csa);
if (!(str2num(csa->field, &low) == 0 && low >= 0.0))
error(csa, "lower bound of arc flow missing or invalid");
check_int(csa, low);
read_field(csa);
if (!(str2num(csa->field, &cap) == 0 && cap >= low))
error(csa, "upper bound of arc flow missing or invalid");
check_int(csa, cap);
read_field(csa);
if (str2num(csa->field, &cost) != 0)
error(csa, "per-unit cost of arc flow missing or invalid");
check_int(csa, cost);
a = glp_add_arc(G, i, j);
if (a_low >= 0)
memcpy((char *)a->data + a_low, &low, sizeof(double));
if (a_cap >= 0)
memcpy((char *)a->data + a_cap, &cap, sizeof(double));
if (a_cost >= 0)
memcpy((char *)a->data + a_cost, &cost, sizeof(double));
end_of_line(csa);
}
xprintf("%d lines were read\n", csa->count);
done: if (ret) glp_erase_graph(G, G->v_size, G->a_size);
if (csa->fp != NULL) xfclose(csa->fp);
if (flag != NULL) xfree(flag);
return ret;
}
/***********************************************************************
* NAME
*
* glp_write_mincost - write min-cost flow problem data in DIMACS format
*
* SYNOPSIS
*
* int glp_write_mincost(glp_graph *G, int v_rhs, int a_low, int a_cap,
* int a_cost, const char *fname);
*
* DESCRIPTION
*
* The routine glp_write_mincost writes minimum cost flow problem data
* in DIMACS 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_mincost(glp_graph *G, int v_rhs, int a_low, int a_cap,
int a_cost, const char *fname)
{ XFILE *fp;
glp_vertex *v;
glp_arc *a;
int i, count = 0, ret;
double rhs, low, cap, cost;
if (v_rhs >= 0 && v_rhs > G->v_size - (int)sizeof(double))
xerror("glp_write_mincost: v_rhs = %d; invalid offset\n",
v_rhs);
if (a_low >= 0 && a_low > G->a_size - (int)sizeof(double))
xerror("glp_write_mincost: a_low = %d; invalid offset\n",
a_low);
if (a_cap >= 0 && a_cap > G->a_size - (int)sizeof(double))
xerror("glp_write_mincost: a_cap = %d; invalid offset\n",
a_cap);
if (a_cost >= 0 && a_cost > G->a_size - (int)sizeof(double))
xerror("glp_write_mincost: a_cost = %d; invalid offset\n",
a_cost);
xprintf("Writing min-cost flow problem data to `%s'...\n",
fname);
fp = xfopen(fname, "w");
if (fp == NULL)
{ xprintf("Unable to create `%s' - %s\n", fname, xerrmsg());
ret = 1;
goto done;
}
xfprintf(fp, "c %s\n",
G->name == NULL ? "unknown" : G->name), count++;
xfprintf(fp, "p min %d %d\n", G->nv, G->na), count++;
if (v_rhs >= 0)
{ for (i = 1; i <= G->nv; i++)
{ v = G->v[i];
memcpy(&rhs, (char *)v->data + v_rhs, sizeof(double));
if (rhs != 0.0)
xfprintf(fp, "n %d %.*g\n", i, DBL_DIG, rhs), count++;
}
}
for (i = 1; i <= G->nv; i++)
{ v = G->v[i];
for (a = v->out; a != NULL; a = a->t_next)
{ if (a_low >= 0)
memcpy(&low, (char *)a->data + a_low, sizeof(double));
else
low = 0.0;
if (a_cap >= 0)
memcpy(&cap, (char *)a->data + a_cap, sizeof(double));
else
cap = 1.0;
if (a_cost >= 0)
memcpy(&cost, (char *)a->data + a_cost, sizeof(double));
else
cost = 0.0;
xfprintf(fp, "a %d %d %.*g %.*g %.*g\n",
a->tail->i, a->head->i, DBL_DIG, low, DBL_DIG, cap,
DBL_DIG, cost), count++;
}
}
xfprintf(fp, "c eof\n"), count++;
xfflush(fp);
if (xferror(fp))
{ xprintf("Write error on `%s' - %s\n", fname, xerrmsg());
ret = 1;
goto done;
}
xprintf("%d lines were written\n", count);
ret = 0;
done: if (fp != NULL) xfclose(fp);
return ret;
}
/***********************************************************************
* NAME
*
* glp_read_maxflow - read maximum flow problem data in DIMACS format
*
* SYNOPSIS
*
* int glp_read_maxflow(glp_graph *G, int *s, int *t, int a_cap,
* const char *fname);
*
* DESCRIPTION
*
* The routine glp_read_maxflow reads maximum flow problem data in
* DIMACS format from 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_read_maxflow(glp_graph *G, int *_s, int *_t, int a_cap,
const char *fname)
{ struct csa _csa, *csa = &_csa;
glp_arc *a;
int i, j, k, s, t, nv, na, ret = 0;
double cap;
if (a_cap >= 0 && a_cap > G->a_size - (int)sizeof(double))
xerror("glp_read_maxflow: a_cap = %d; invalid offset\n",
a_cap);
glp_erase_graph(G, G->v_size, G->a_size);
if (setjmp(csa->jump))
{ ret = 1;
goto done;
}
csa->fname = fname;
csa->fp = NULL;
csa->count = 0;
csa->c = '\n';
csa->field[0] = '\0';
csa->empty = csa->nonint = 0;
xprintf("Reading maximum flow problem data from `%s'...\n",
fname);
csa->fp = xfopen(fname, "r");
if (csa->fp == NULL)
{ xprintf("Unable to open `%s' - %s\n", fname, xerrmsg());
longjmp(csa->jump, 1);
}
/* read problem line */
read_designator(csa);
if (strcmp(csa->field, "p") != 0)
error(csa, "problem line missing or invalid");
read_field(csa);
if (strcmp(csa->field, "max") != 0)
error(csa, "wrong problem designator; `max' expected");
read_field(csa);
if (!(str2int(csa->field, &nv) == 0 && nv >= 2))
error(csa, "number of nodes missing or invalid");
read_field(csa);
if (!(str2int(csa->field, &na) == 0 && na >= 0))
error(csa, "number of arcs missing or invalid");
xprintf("Flow network has %d node%s and %d arc%s\n",
nv, nv == 1 ? "" : "s", na, na == 1 ? "" : "s");
if (nv > 0) glp_add_vertices(G, nv);
end_of_line(csa);
/* read node descriptor lines */
s = t = 0;
for (;;)
{ read_designator(csa);
if (strcmp(csa->field, "n") != 0) break;
read_field(csa);
if (str2int(csa->field, &i) != 0)
error(csa, "node number missing or invalid");
if (!(1 <= i && i <= nv))
error(csa, "node number %d out of range", i);
read_field(csa);
if (strcmp(csa->field, "s") == 0)
{ if (s > 0)
error(csa, "only one source node allowed");
s = i;
}
else if (strcmp(csa->field, "t") == 0)
{ if (t > 0)
error(csa, "only one sink node allowed");
t = i;
}
else
error(csa, "wrong node designator; `s' or `t' expected");
if (s > 0 && s == t)
error(csa, "source and sink nodes must be distinct");
end_of_line(csa);
}
if (s == 0)
error(csa, "source node descriptor missing\n");
if (t == 0)
error(csa, "sink node descriptor missing\n");
if (_s != NULL) *_s = s;
if (_t != NULL) *_t = t;
/* read arc descriptor lines */
for (k = 1; k <= na; k++)
{ if (k > 1) read_designator(csa);
if (strcmp(csa->field, "a") != 0)
error(csa, "wrong line designator; `a' expected");
read_field(csa);
if (str2int(csa->field, &i) != 0)
error(csa, "starting node number missing or invalid");
if (!(1 <= i && i <= nv))
error(csa, "starting node number %d out of range", i);
read_field(csa);
if (str2int(csa->field, &j) != 0)
error(csa, "ending node number missing or invalid");
if (!(1 <= j && j <= nv))
error(csa, "ending node number %d out of range", j);
read_field(csa);
if (!(str2num(csa->field, &cap) == 0 && cap >= 0.0))
error(csa, "arc capacity missing or invalid");
check_int(csa, cap);
a = glp_add_arc(G, i, j);
if (a_cap >= 0)
memcpy((char *)a->data + a_cap, &cap, sizeof(double));
end_of_line(csa);
}
xprintf("%d lines were read\n", csa->count);
done: if (ret) glp_erase_graph(G, G->v_size, G->a_size);
if (csa->fp != NULL) xfclose(csa->fp);
return ret;
}
/***********************************************************************
* NAME
*
* glp_write_maxflow - write maximum flow problem data in DIMACS format
*
* SYNOPSIS
*
* int glp_write_maxflow(glp_graph *G, int s, int t, int a_cap,
* const char *fname);
*
* DESCRIPTION
*
* The routine glp_write_maxflow writes maximum flow problem data in
* DIMACS 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_maxflow(glp_graph *G, int s, int t, int a_cap,
const char *fname)
{ XFILE *fp;
glp_vertex *v;
glp_arc *a;
int i, count = 0, ret;
double cap;
if (!(1 <= s && s <= G->nv))
xerror("glp_write_maxflow: s = %d; source node number out of r"
"ange\n", s);
if (!(1 <= t && t <= G->nv))
xerror("glp_write_maxflow: t = %d: sink node number out of ran"
"ge\n", t);
if (a_cap >= 0 && a_cap > G->a_size - (int)sizeof(double))
xerror("glp_write_mincost: a_cap = %d; invalid offset\n",
a_cap);
xprintf("Writing maximum flow problem data to `%s'...\n",
fname);
fp = xfopen(fname, "w");
if (fp == NULL)
{ xprintf("Unable to create `%s' - %s\n", fname, xerrmsg());
ret = 1;
goto done;
}
xfprintf(fp, "c %s\n",
G->name == NULL ? "unknown" : G->name), count++;
xfprintf(fp, "p max %d %d\n", G->nv, G->na), count++;
xfprintf(fp, "n %d s\n", s), count++;
xfprintf(fp, "n %d t\n", t), count++;
for (i = 1; i <= G->nv; i++)
{ v = G->v[i];
for (a = v->out; a != NULL; a = a->t_next)
{ if (a_cap >= 0)
memcpy(&cap, (char *)a->data + a_cap, sizeof(double));
else
cap = 1.0;
xfprintf(fp, "a %d %d %.*g\n",
a->tail->i, a->head->i, DBL_DIG, cap), count++;
}
}
xfprintf(fp, "c eof\n"), count++;
xfflush(fp);
if (xferror(fp))
{ xprintf("Write error on `%s' - %s\n", fname, xerrmsg());
ret = 1;
goto done;
}
xprintf("%d lines were written\n", count);
ret = 0;
done: if (fp != NULL) xfclose(fp);
return ret;
}
/***********************************************************************
* NAME
*
* glp_read_asnprob - read assignment problem data in DIMACS format
*
* SYNOPSIS
*
* int glp_read_asnprob(glp_graph *G, int v_set, int a_cost,
* const char *fname);
*
* DESCRIPTION
*
* The routine glp_read_asnprob reads assignment problem data in DIMACS
* format from 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_read_asnprob(glp_graph *G, int v_set, int a_cost, const char
*fname)
{ struct csa _csa, *csa = &_csa;
glp_vertex *v;
glp_arc *a;
int nv, na, n1, i, j, k, ret = 0;
double cost;
char *flag = NULL;
if (v_set >= 0 && v_set > G->v_size - (int)sizeof(int))
xerror("glp_read_asnprob: v_set = %d; invalid offset\n",
v_set);
if (a_cost >= 0 && a_cost > G->a_size - (int)sizeof(double))
xerror("glp_read_asnprob: a_cost = %d; invalid offset\n",
a_cost);
glp_erase_graph(G, G->v_size, G->a_size);
if (setjmp(csa->jump))
{ ret = 1;
goto done;
}
csa->fname = fname;
csa->fp = NULL;
csa->count = 0;
csa->c = '\n';
csa->field[0] = '\0';
csa->empty = csa->nonint = 0;
xprintf("Reading assignment problem data from `%s'...\n", fname);
csa->fp = xfopen(fname, "r");
if (csa->fp == NULL)
{ xprintf("Unable to open `%s' - %s\n", fname, xerrmsg());
longjmp(csa->jump, 1);
}
/* read problem line */
read_designator(csa);
if (strcmp(csa->field, "p") != 0)
error(csa, "problem line missing or invalid");
read_field(csa);
if (strcmp(csa->field, "asn") != 0)
error(csa, "wrong problem designator; `asn' expected");
read_field(csa);
if (!(str2int(csa->field, &nv) == 0 && nv >= 0))
error(csa, "number of nodes missing or invalid");
read_field(csa);
if (!(str2int(csa->field, &na) == 0 && na >= 0))
error(csa, "number of arcs missing or invalid");
if (nv > 0) glp_add_vertices(G, nv);
end_of_line(csa);
/* read node descriptor lines */
flag = xcalloc(1+nv, sizeof(char));
memset(&flag[1], 0, nv * sizeof(char));
n1 = 0;
for (;;)
{ read_designator(csa);
if (strcmp(csa->field, "n") != 0) break;
read_field(csa);
if (str2int(csa->field, &i) != 0)
error(csa, "node number missing or invalid");
if (!(1 <= i && i <= nv))
error(csa, "node number %d out of range", i);
if (flag[i])
error(csa, "duplicate descriptor of node %d", i);
flag[i] = 1, n1++;
end_of_line(csa);
}
xprintf(
"Assignment problem has %d + %d = %d node%s and %d arc%s\n",
n1, nv - n1, nv, nv == 1 ? "" : "s", na, na == 1 ? "" : "s");
if (v_set >= 0)
{ for (i = 1; i <= nv; i++)
{ v = G->v[i];
k = (flag[i] ? 0 : 1);
memcpy((char *)v->data + v_set, &k, sizeof(int));
}
}
/* read arc descriptor lines */
for (k = 1; k <= na; k++)
{ if (k > 1) read_designator(csa);
if (strcmp(csa->field, "a") != 0)
error(csa, "wrong line designator; `a' expected");
read_field(csa);
if (str2int(csa->field, &i) != 0)
error(csa, "starting node number missing or invalid");
if (!(1 <= i && i <= nv))
error(csa, "starting node number %d out of range", i);
if (!flag[i])
error(csa, "node %d cannot be a starting node", i);
read_field(csa);
if (str2int(csa->field, &j) != 0)
error(csa, "ending node number missing or invalid");
if (!(1 <= j && j <= nv))
error(csa, "ending node number %d out of range", j);
if (flag[j])
error(csa, "node %d cannot be an ending node", j);
read_field(csa);
if (str2num(csa->field, &cost) != 0)
error(csa, "arc cost missing or invalid");
check_int(csa, cost);
a = glp_add_arc(G, i, j);
if (a_cost >= 0)
memcpy((char *)a->data + a_cost, &cost, sizeof(double));
end_of_line(csa);
}
xprintf("%d lines were read\n", csa->count);
done: if (ret) glp_erase_graph(G, G->v_size, G->a_size);
if (csa->fp != NULL) xfclose(csa->fp);
if (flag != NULL) xfree(flag);
return ret;
}
/***********************************************************************
* NAME
*
* glp_write_asnprob - write assignment problem data in DIMACS format
*
* SYNOPSIS
*
* int glp_write_asnprob(glp_graph *G, int v_set, int a_cost,
* const char *fname);
*
* DESCRIPTION
*
* The routine glp_write_asnprob writes assignment problem data in
* DIMACS 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_asnprob(glp_graph *G, int v_set, int a_cost, const char
*fname)
{ XFILE *fp;
glp_vertex *v;
glp_arc *a;
int i, k, count = 0, ret;
double cost;
if (v_set >= 0 && v_set > G->v_size - (int)sizeof(int))
xerror("glp_write_asnprob: v_set = %d; invalid offset\n",
v_set);
if (a_cost >= 0 && a_cost > G->a_size - (int)sizeof(double))
xerror("glp_write_asnprob: a_cost = %d; invalid offset\n",
a_cost);
xprintf("Writing assignment problem data to `%s'...\n", fname);
fp = xfopen(fname, "w");
if (fp == NULL)
{ xprintf("Unable to create `%s' - %s\n", fname, xerrmsg());
ret = 1;
goto done;
}
xfprintf(fp, "c %s\n",
G->name == NULL ? "unknown" : G->name), count++;
xfprintf(fp, "p asn %d %d\n", G->nv, G->na), count++;
for (i = 1; i <= G->nv; i++)
{ v = G->v[i];
if (v_set >= 0)
memcpy(&k, (char *)v->data + v_set, sizeof(int));
else
k = (v->out != NULL ? 0 : 1);
if (k == 0)
xfprintf(fp, "n %d\n", i), count++;
}
for (i = 1; i <= G->nv; i++)
{ v = G->v[i];
for (a = v->out; a != NULL; a = a->t_next)
{ if (a_cost >= 0)
memcpy(&cost, (char *)a->data + a_cost, sizeof(double));
else
cost = 1.0;
xfprintf(fp, "a %d %d %.*g\n",
a->tail->i, a->head->i, DBL_DIG, cost), count++;
}
}
xfprintf(fp, "c eof\n"), count++;
xfflush(fp);
if (xferror(fp))
{ xprintf("Write error on `%s' - %s\n", fname, xerrmsg());
ret = 1;
goto done;
}
xprintf("%d lines were written\n", count);
ret = 0;
done: if (fp != NULL) xfclose(fp);
return ret;
}
/***********************************************************************
* NAME
*
* glp_read_ccdata - read graph in DIMACS clique/coloring format
*
* SYNOPSIS
*
* int glp_read_ccdata(glp_graph *G, int v_wgt, const char *fname);
*
* DESCRIPTION
*
* The routine glp_read_ccdata reads an (undirected) graph in DIMACS
* clique/coloring format from 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_read_ccdata(glp_graph *G, int v_wgt, const char *fname)
{ struct csa _csa, *csa = &_csa;
glp_vertex *v;
int i, j, k, nv, ne, ret = 0;
double w;
char *flag = NULL;
if (v_wgt >= 0 && v_wgt > G->v_size - (int)sizeof(double))
xerror("glp_read_ccdata: v_wgt = %d; invalid offset\n",
v_wgt);
glp_erase_graph(G, G->v_size, G->a_size);
if (setjmp(csa->jump))
{ ret = 1;
goto done;
}
csa->fname = fname;
csa->fp = NULL;
csa->count = 0;
csa->c = '\n';
csa->field[0] = '\0';
csa->empty = csa->nonint = 0;
xprintf("Reading graph from `%s'...\n", fname);
csa->fp = xfopen(fname, "r");
if (csa->fp == NULL)
{ xprintf("Unable to open `%s' - %s\n", fname, xerrmsg());
longjmp(csa->jump, 1);
}
/* read problem line */
read_designator(csa);
if (strcmp(csa->field, "p") != 0)
error(csa, "problem line missing or invalid");
read_field(csa);
if (strcmp(csa->field, "edge") != 0)
error(csa, "wrong problem designator; `edge' expected");
read_field(csa);
if (!(str2int(csa->field, &nv) == 0 && nv >= 0))
error(csa, "number of vertices missing or invalid");
read_field(csa);
if (!(str2int(csa->field, &ne) == 0 && ne >= 0))
error(csa, "number of edges missing or invalid");
xprintf("Graph has %d vert%s and %d edge%s\n",
nv, nv == 1 ? "ex" : "ices", ne, ne == 1 ? "" : "s");
if (nv > 0) glp_add_vertices(G, nv);
end_of_line(csa);
/* read node descriptor lines */
flag = xcalloc(1+nv, sizeof(char));
memset(&flag[1], 0, nv * sizeof(char));
if (v_wgt >= 0)
{ w = 1.0;
for (i = 1; i <= nv; i++)
{ v = G->v[i];
memcpy((char *)v->data + v_wgt, &w, sizeof(double));
}
}
for (;;)
{ read_designator(csa);
if (strcmp(csa->field, "n") != 0) break;
read_field(csa);
if (str2int(csa->field, &i) != 0)
error(csa, "vertex number missing or invalid");
if (!(1 <= i && i <= nv))
error(csa, "vertex number %d out of range", i);
if (flag[i])
error(csa, "duplicate descriptor of vertex %d", i);
read_field(csa);
if (str2num(csa->field, &w) != 0)
error(csa, "vertex weight missing or invalid");
check_int(csa, w);
if (v_wgt >= 0)
{ v = G->v[i];
memcpy((char *)v->data + v_wgt, &w, sizeof(double));
}
flag[i] = 1;
end_of_line(csa);
}
xfree(flag), flag = NULL;
/* read edge descriptor lines */
for (k = 1; k <= ne; k++)
{ if (k > 1) read_designator(csa);
if (strcmp(csa->field, "e") != 0)
error(csa, "wrong line designator; `e' expected");
read_field(csa);
if (str2int(csa->field, &i) != 0)
error(csa, "first vertex number missing or invalid");
if (!(1 <= i && i <= nv))
error(csa, "first vertex number %d out of range", i);
read_field(csa);
if (str2int(csa->field, &j) != 0)
error(csa, "second vertex number missing or invalid");
if (!(1 <= j && j <= nv))
error(csa, "second vertex number %d out of range", j);
glp_add_arc(G, i, j);
end_of_line(csa);
}
xprintf("%d lines were read\n", csa->count);
done: if (ret) glp_erase_graph(G, G->v_size, G->a_size);
if (csa->fp != NULL) xfclose(csa->fp);
if (flag != NULL) xfree(flag);
return ret;
}
/***********************************************************************
* 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)
{ XFILE *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 = xfopen(fname, "w");
if (fp == NULL)
{ xprintf("Unable to create `%s' - %s\n", fname, xerrmsg());
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++;
xfflush(fp);
if (xferror(fp))
{ xprintf("Write error on `%s' - %s\n", fname, xerrmsg());
ret = 1;
goto done;
}
xprintf("%d lines were written\n", count);
ret = 0;
done: if (fp != NULL) xfclose(fp);
return ret;
}
/***********************************************************************
* NAME
*
* glp_read_prob - read problem data in GLPK format
*