diff options
Diffstat (limited to 'test/monniaux/glpk-4.65/src/api/rdcnf.c')
| -rw-r--r-- | test/monniaux/glpk-4.65/src/api/rdcnf.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/test/monniaux/glpk-4.65/src/api/rdcnf.c b/test/monniaux/glpk-4.65/src/api/rdcnf.c new file mode 100644 index 00000000..acab50fe --- /dev/null +++ b/test/monniaux/glpk-4.65/src/api/rdcnf.c @@ -0,0 +1,136 @@ +/* rdcnf.c (read CNF-SAT problem data in DIMACS format) */ + +/*********************************************************************** +* This code is part of GLPK (GNU Linear Programming Kit). +* +* Copyright (C) 2010-2016 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 "dimacs.h" +#include "misc.h" +#include "prob.h" + +#define xfprintf glp_format +#define error dmx_error +#define warning dmx_warning +#define read_char dmx_read_char +#define read_designator dmx_read_designator +#define read_field dmx_read_field +#define end_of_line dmx_end_of_line +#define check_int dmx_check_int + +int glp_read_cnfsat(glp_prob *P, const char *fname) +{ /* read CNF-SAT problem data in DIMACS format */ + DMX _csa, *csa = &_csa; + int m, n, i, j, len, neg, rhs, ret = 0, *ind = NULL; + double *val = NULL; + char *map = NULL; +#if 0 /* 04/IV-2016 */ + if (P == NULL || P->magic != GLP_PROB_MAGIC) + xerror("glp_read_cnfsat: P = %p; invalid problem object\n", + P); +#endif + if (fname == NULL) + xerror("glp_read_cnfsat: fname = %p; invalid parameter\n", + fname); + glp_erase_prob(P); + 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 CNF-SAT problem data from '%s'...\n", fname); + csa->fp = glp_open(fname, "r"); + if (csa->fp == NULL) + { xprintf("Unable to open '%s' - %s\n", fname, get_err_msg()); + 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, "cnf") != 0) + error(csa, "wrong problem designator; 'cnf' expected\n"); + read_field(csa); + if (!(str2int(csa->field, &n) == 0 && n >= 0)) + error(csa, "number of variables missing or invalid\n"); + read_field(csa); + if (!(str2int(csa->field, &m) == 0 && m >= 0)) + error(csa, "number of clauses missing or invalid\n"); + xprintf("Instance has %d variable%s and %d clause%s\n", + n, n == 1 ? "" : "s", m, m == 1 ? "" : "s"); + end_of_line(csa); + if (m > 0) + glp_add_rows(P, m); + if (n > 0) + { glp_add_cols(P, n); + for (j = 1; j <= n; j++) + glp_set_col_kind(P, j, GLP_BV); + } + /* allocate working arrays */ + ind = xcalloc(1+n, sizeof(int)); + val = xcalloc(1+n, sizeof(double)); + map = xcalloc(1+n, sizeof(char)); + for (j = 1; j <= n; j++) map[j] = 0; + /* read clauses */ + for (i = 1; i <= m; i++) + { /* read i-th clause */ + len = 0, rhs = 1; + for (;;) + { /* skip white-space characters */ + while (csa->c == ' ' || csa->c == '\n') + read_char(csa); + /* read term */ + read_field(csa); + if (str2int(csa->field, &j) != 0) + error(csa, "variable number missing or invalid\n"); + if (j > 0) + neg = 0; + else if (j < 0) + neg = 1, j = -j, rhs--; + else + break; + if (!(1 <= j && j <= n)) + error(csa, "variable number out of range\n"); + if (map[j]) + error(csa, "duplicate variable number\n"); + len++, ind[len] = j, val[len] = (neg ? -1.0 : +1.0); + map[j] = 1; + } + glp_set_row_bnds(P, i, GLP_LO, (double)rhs, 0.0); + glp_set_mat_row(P, i, len, ind, val); + while (len > 0) map[ind[len--]] = 0; + } + xprintf("%d lines were read\n", csa->count); + /* problem data has been successfully read */ + glp_sort_matrix(P); +done: if (csa->fp != NULL) glp_close(csa->fp); + if (ind != NULL) xfree(ind); + if (val != NULL) xfree(val); + if (map != NULL) xfree(map); + if (ret) glp_erase_prob(P); + return ret; +} + +/* eof */ |