Added cddlib-094h from http://www.inf.ethz.ch/personal/fukudak/cdd_home/
Change-Id: I64519509269e434b1b9ea87c3fe0805e711c0ac9
diff --git a/third_party/cddlib/src/fourier.c b/third_party/cddlib/src/fourier.c
new file mode 100644
index 0000000..bff5dd5
--- /dev/null
+++ b/third_party/cddlib/src/fourier.c
@@ -0,0 +1,132 @@
+/* fourier.c: Test program to call the cdd library cddlib
+ written by Komei Fukuda, fukuda@ifor.math.ethz.ch
+ Version 0.94, August 4, 2005
+ Standard ftp site: ftp.ifor.math.ethz.ch, Directory: pub/fukuda/cdd
+*/
+
+/* This program 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 2 of the License, or
+ (at your option) any later version.
+
+ This program 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 this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "setoper.h"
+#include "cdd.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+#include <string.h>
+
+dd_boolean SetInputFile(FILE **f, dd_DataFileType fname)
+{
+ dd_boolean success=dd_FALSE;
+ success=dd_FALSE;
+
+ if ( ( *f = fopen(fname, "r") )!= NULL) {
+ printf("input file %s is open\n", fname);
+ success=dd_TRUE;
+ }
+ else{
+ printf("The input file %s not found\n",fname);
+ }
+ return success;
+}
+
+dd_boolean SetWriteFile(FILE **f, dd_DataFileType fname)
+{
+ dd_boolean success=dd_FALSE;
+
+ if ( (*f = fopen(fname, "w")) != NULL){
+ printf("output file %s is open\n",fname);
+ success=dd_TRUE;
+ }
+ else{
+ printf("The output file %s cannot be opened\n",fname);
+ }
+ return success;
+}
+
+
+int main(int argc, char *argv[])
+{
+ dd_MatrixPtr M=NULL,M1=NULL,M2=NULL;
+ dd_colrange j,s,d;
+ dd_ErrorType err=dd_NoError;
+ dd_rowset redset,impl_linset;
+ dd_rowindex newpos;
+ mytype val;
+ dd_DataFileType inputfile;
+ FILE *reading=NULL;
+
+ dd_set_global_constants(); /* First, this must be called. */
+
+ dd_init(val);
+ if (argc>1) strcpy(inputfile,argv[1]);
+ if (argc<=1 || !SetInputFile(&reading,argv[1])){
+ dd_WriteProgramDescription(stdout);
+ fprintf(stdout,"\ncddlib test program to apply Fourier's Elimination to an H-polyhedron.\n");
+ dd_SetInputFile(&reading,inputfile, &err);
+ }
+ if (err==dd_NoError) {
+ M=dd_PolyFile2Matrix(reading, &err);
+ }
+ else {
+ fprintf(stderr,"Input file not found\n");
+ goto _L99;
+ }
+
+ if (err!=dd_NoError) goto _L99;
+
+ d=M->colsize;
+ M2=dd_CopyMatrix(M);
+
+ printf("How many variables to elminate? (max %ld): ",d-1);
+ scanf("%ld",&s);
+
+ if (s>0 && s < d){
+ for (j=1; j<=s; j++){
+ M1=dd_FourierElimination(M2, &err);
+ printf("\nRemove the variable %ld. The resulting redundant system.\n",d-j);
+ dd_WriteMatrix(stdout, M1);
+
+ dd_MatrixCanonicalize(&M1, &impl_linset, &redset, &newpos, &err);
+ if (err!=dd_NoError) goto _L99;
+
+ fprintf(stdout, "\nRedundant rows: ");
+ set_fwrite(stdout, redset);
+
+ dd_FreeMatrix(M2);
+ M2=M1;
+ set_free(redset);
+ set_free(impl_linset);
+ free(newpos);
+ }
+
+ printf("\nNonredundant representation:\n");
+ dd_WriteMatrix(stdout, M1);
+ } else {
+ printf("Value out of range\n");
+ }
+
+ dd_FreeMatrix(M);
+ dd_FreeMatrix(M1);
+ dd_clear(val);
+
+_L99:;
+ /* if (err!=dd_NoError) dd_WriteErrorMessages(stderr,err); */
+ dd_free_global_constants(); /* At the end, this should be called. */
+ return 0;
+}
+
+
+/* end of fourier.c */