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/*******************************************************/
/* CUDF solver: pblib_solver.c */
/* Interface to the pblib format solvers */
/* (c) Claude Michel I3S (UNSA-CNRS) 2009,2010,2011 */
/*******************************************************/
#include <pblib_solver.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#define CLEAN_FILES 1
#define TMP_FILES_PATH "/tmp/"
// external function for solver creation
abstract_solver *new_pblib_solver(char *pb_solver) { return new pblib_solver(pb_solver); }
// solver initialisation
int pblib_solver::init_solver(CUDFVersionedPackageList *all_versioned_packages, int other_vars) {
nb_packages = all_versioned_packages->size();
this->all_versioned_packages = all_versioned_packages;
// Coefficient initialization
initialize_coeffs(nb_packages + other_vars);
nb_constraints = 0;
mult = ' ';
for (int i = 0; i < ((int)strlen(pb_solver) - 7); i++)
if ((pb_solver[i] == 'm') && (strncmp(pb_solver+i, "minisat", 7) == 0)) { mult = '*'; break; }
solution = (CUDFcoefficient *)malloc(nb_vars*sizeof(CUDFcoefficient));
sprintf(ctpbfilename, TMP_FILES_PATH "ctpblib_%lu_%lu.lp", (long unsigned)getuid(), (long unsigned)getpid());
ctpbfile = fopen(ctpbfilename, "w");
if (solution == (CUDFcoefficient *)NULL) {
fprintf(stderr, "lp_solver: intialize: not enough memory to store solution.\n");
exit(-1);
} else if (ctpbfile == (FILE *)NULL) {
fprintf(stderr, "lp_solver: intialize: can not open %s.\n", ctpbfilename);
exit(-1);
} else
return 0;
}
// write the problem into a file
int pblib_solver::writelp(char *filename) { return 0; }
// solve the current problem
int pblib_solver::solve() {
int status = 0;
int rank, iobjval;
char command[1024];
FILE *fsol = (FILE *)NULL;
bool is_scip = false;
CUDFcoefficient objvals[20]; int nb_objectives = (int)objectives.size();
for (int i = 0; i < ((int)strlen(pb_solver) - 4); i++)
if ((pb_solver[i] == 's') && (strncmp(pb_solver+i, "scip", 4) == 0)) { is_scip = true; break; }
sprintf(pbfilename, TMP_FILES_PATH "pblib_%lu_%lu.opb", (long unsigned)getuid(), (long unsigned)getpid());
sprintf(pboutfilename, TMP_FILES_PATH "pblib_%lu_%lu.out", (long unsigned)getuid(), (long unsigned)getpid());
for (int iobj = 0; iobj < nb_objectives; iobj++) {
if (objectives[iobj]->nb_coeffs == 0) continue;
if ((pbfile = fopen(pbfilename, "w")) == (FILE *)NULL) {
fprintf(stderr, "pblib_solver: cannot open %s.\n", pbfilename);
exit(-1);
}
fprintf(pbfile, "* #variable= %d #constraint= %d \n* a CUDF problem\nmin:", nb_vars, nb_constraints+iobj);
for (int i = 0; i < objectives[iobj]->nb_coeffs; i++)
fprintf(pbfile, " "CUDFflagsplus"%cx%d", objectives[iobj]->coefficients[i], mult, objectives[iobj]->sindex[i]);
fprintf(pbfile, ";\n");
for (int i = 0; i < iobj; i++) {
if (objectives[i]->nb_coeffs > 0) {
char *sep = (char *)"";
for (int j = 0; j < objectives[i]->nb_coeffs; j++) {
fprintf(pbfile, "%s"CUDFflagsplus"%cx%d", sep, objectives[i]->coefficients[j], mult, objectives[i]->sindex[j]);
sep = (char *)" ";
}
fprintf(pbfile, " = "CUDFflags";\n", objvals[i]);
}
}
fclose(pbfile);
if (verbosity < 2) {
if (is_scip)
sprintf(command, "cat %s >> %s; %s -f %s > %s 2> /dev/null",
ctpbfilename, pbfilename, pb_solver, pbfilename, pboutfilename);
else
sprintf(command, "cat %s >> %s; %s %s > %s 2> /dev/null",
ctpbfilename, pbfilename, pb_solver, pbfilename, pboutfilename);
} else {
if (is_scip)
sprintf(command, "cat %s >> %s; %s -f %s | tee %s",
ctpbfilename, pbfilename, pb_solver, pbfilename, pboutfilename);
else
sprintf(command, "cat %s >> %s; %s %s | tee %s",
ctpbfilename, pbfilename, pb_solver, pbfilename, pboutfilename);
}
if (system(command) == -1) {
fprintf(stderr, "mccs: error while calling solver.\n");
exit(-1);
}
if ((fsol = fopen(pboutfilename, "r")) == (FILE *)NULL) {
fprintf(stderr, "Cannot open solution file \"%s\".\n", pboutfilename);
exit(-1);
}
for (int i = 0; i < nb_packages; i++) solution[i] = 0;
if (is_scip) {
int state = 1;
size_t size = 2048;
char buff[2048]; char *buffer = buff;
while (! feof(fsol)) { /* seek : primal solution: */
int nbread = getline((char **)&buffer, &size, fsol);
if ((state == 1) && (buffer[0] == 'p') && (nbread >= 16) && (strncmp(buffer, "primal solution:", 16) == 0)) {
nbread = getline((char **)&buffer, &size, fsol); /* forget next line */
nbread = getline((char **)&buffer, &size, fsol); /* forget next line */
state = 2;
} else if (state == 2) {
if ((buffer[0] == 'n') && (nbread >= 21) && (strncmp(buffer, "no solution available", 21) == 0))
return 0;
else if ((buffer[0] == 'o') && (nbread >= 16) && (strncmp(buffer, "objective value:", 16) == 0)) {
int i = 17;
while ((buffer[i] != '-') && ((buffer[i] < '0') || (buffer[i] > '9'))) i++;
if (sscanf(buffer+i, "%d", &iobjval) > 0) objval = objvals[iobj] = iobjval;
status = 1;
state = 3;
}
} else if (state == 3) {
if (buffer[0] == ' ')
break;
else if ((buffer[0] == 'x') && (sscanf(buffer+1, "%d", &rank) > 0))
solution[rank-1] = 1;
}
}
} else {
objval = objvals[iobj] = 0;
while (! feof(fsol)) {
char c = fgetc(fsol);
switch (c) {
case '\n':
break;
case 's':
fgetc(fsol);
if (fgets(command, 1000, fsol) != NULL) {
if (strncmp(command, "OPTIMUM FOUND", 12) == 0) status = 1; else return 0;
}
break;
case 'v':
while (! feof(fsol)) {
c = fgetc(fsol);
if (c == '\n')
break;
else if (c == '-')
while (! feof(fsol)) { if (fgetc(fsol) == ' ') break;}
else if (c == 'x')
if (fscanf(fsol, "%d", &rank) > 0) solution[rank-1] = 1;
}
break;
case 'o':
fgetc(fsol);
if (fscanf(fsol, "%d", &iobjval) > 0) objval = objvals[iobj] = iobjval;
default:
while ((! feof(fsol)) && (fgetc(fsol) != '\n'));
}
}
}
}
if (CLEAN_FILES) {
remove(ctpbfilename);
remove(pbfilename);
remove(pboutfilename);
}
return status;
}
// get objective function value
CUDFcoefficient pblib_solver::objective_value() { return objval; }
// solution initialisation
int pblib_solver::init_solutions() { return 0; }
// return the status of a package within the final configuration
CUDFcoefficient pblib_solver::get_solution(CUDFVersionedPackage *package) { return solution[package->rank]; }
// initialize objective function
int pblib_solver::begin_objectives(void) { return 0; }
// return the package coefficient of the objective function
CUDFcoefficient pblib_solver::get_obj_coeff(CUDFVersionedPackage *package) { return get_coeff(package); }
// return the package coefficient of the objective function
CUDFcoefficient pblib_solver::get_obj_coeff(int rank) { return get_coeff(rank); }
// set the package coefficient of the objective function
int pblib_solver::set_obj_coeff(CUDFVersionedPackage *package, CUDFcoefficient value) {
set_coeff(package, value);
return 0;
}
// set the column coefficient of the objective function
int pblib_solver::set_obj_coeff(int rank, CUDFcoefficient value) {
set_coeff(rank, value);
return 0;
}
int pblib_solver::new_objective(void) { reset_coeffs(); return 0; }
int pblib_solver::add_objective(void) {
push_obj();
return 0;
}
// finalize the objective function
int pblib_solver::end_objectives(void) { return 0; }
// initialize constraints
int pblib_solver::begin_add_constraints(void) { return 0; }
// begin a new constraint
int pblib_solver::new_constraint(void) { reset_coeffs(); return 0; }
// get the package coefficient of the current constraint
CUDFcoefficient pblib_solver::get_constraint_coeff(CUDFVersionedPackage *package) { return get_coeff(package); }
// get the package coefficient of the current constraint
CUDFcoefficient pblib_solver::get_constraint_coeff(int rank) { return get_coeff(rank); }
// set package coefficient of the current constraint
int pblib_solver::set_constraint_coeff(CUDFVersionedPackage *package, CUDFcoefficient value) {
set_coeff(package, value);
return 0;
}
// set column coefficient of the current constraint
int pblib_solver::set_constraint_coeff(int rank, CUDFcoefficient value) {
set_coeff(rank, value);
return 0;
}
// add current constraint as a greater equal constraint
int pblib_solver::add_constraint_geq(CUDFcoefficient bound) {
char *sep = (char *)"";
if (nb_coeffs > 0) {
for (int i = 0; i < nb_coeffs; i++) {
fprintf(ctpbfile, "%s"CUDFflagsplus"%cx%d", sep, coefficients[i], mult, sindex[i]);
sep = (char *)" ";
}
if (bound == 0) fprintf(ctpbfile, " >= 0;\n"); else fprintf(ctpbfile, " >= "CUDFflags";\n", bound);
nb_constraints++;
}
return 0;
}
// add current constraint as a less or equal constraint
int pblib_solver::add_constraint_leq(CUDFcoefficient bound) {
char *sep = (char *)"";
if (nb_coeffs > 0) {
for (int i = 0; i < nb_coeffs; i++) {
fprintf(ctpbfile, "%s"CUDFflagsplus"%cx%d", sep, coefficients[i], mult, sindex[i]);
sep = (char *)" ";
}
if (bound == 0) fprintf(ctpbfile, " <= 0;\n"); else fprintf(ctpbfile, " <= "CUDFflags";\n", bound);
nb_constraints++;
}
return 0;
}
// add current constraint as an equality constraint
int pblib_solver::add_constraint_eq(CUDFcoefficient bound) {
char *sep = (char *)"";
if (nb_coeffs > 0) {
for (int i = 0; i < nb_coeffs; i++) {
fprintf(ctpbfile, "%s"CUDFflagsplus"%cx%d", sep, coefficients[i], mult, sindex[i]);
sep = (char *)" ";
}
if (bound == 0) fprintf(ctpbfile, " = 0;\n"); else fprintf(ctpbfile, " = "CUDFflags";\n", bound);
nb_constraints++;
}
return 0;
}
// finalize constraints
int pblib_solver::end_add_constraints(void) {
fclose(ctpbfile);
return 0;
}
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