/[escript]/trunk/paso/src/SystemMatrix_loadMM.c
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Diff of /trunk/paso/src/SystemMatrix_loadMM.c

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revision 2273 by artak, Wed Dec 17 00:50:37 2008 UTC revision 2274 by artak, Tue Feb 17 04:20:29 2009 UTC
# Line 27  Line 27 
27  #include "mmio.h"  #include "mmio.h"
28  #include "SystemMatrix.h"  #include "SystemMatrix.h"
29    
30    #include "limits.h"
31    
32  #define FSCANF_CHECK(scan_ret, reason) { if (scan_ret == EOF) perror(reason); return NULL; }  #define FSCANF_CHECK(scan_ret, reason) { if (scan_ret == EOF) perror(reason); return NULL; }
33    
34  static void swap( index_t*, index_t*, double*, int, int );  static void swap( index_t*, index_t*, double*, int, int );
# Line 71  void swap( index_t *r, index_t *c, doubl Line 73  void swap( index_t *r, index_t *c, doubl
73  void q_sort( index_t *row, index_t *col, double *val, int begin, int end )  void q_sort( index_t *row, index_t *col, double *val, int begin, int end )
74  {  {
75      int l, r;      int l, r;
76      index_t pivot, lval;      unsigned long pivot, lval;
77    
78    
79      if( end > begin )      if( end > begin )
80      {      {
81          pivot = N * row[begin] + col[begin];          pivot = ((unsigned long)N) * row[begin]+col[begin] ;
82          l = begin + 1;          l = begin + 1;
83          r = end;          r = end;
84    
85          while( l < r )          while( l < r )
86          {          {
87              lval = N * row[l] + col[l];              lval = ((unsigned long)N) * row[l]+col[l];
88              if( lval < pivot )              if( lval < pivot )
89                  l++;                  l++;
90              else              else
# Line 148  Paso_SystemMatrix* Paso_SystemMatrix_loa Line 151  Paso_SystemMatrix* Paso_SystemMatrix_loa
151      /* get matrix size */      /* get matrix size */
152      if( mm_read_mtx_crd_size(fileHandle_p, &M, &N, &nz) != 0 )      if( mm_read_mtx_crd_size(fileHandle_p, &M, &N, &nz) != 0 )
153      {      {
154          Paso_setError(IO_ERROR, "Paso_SystemMatrix_loadMM_toCSR: Could not read sparse matrix size");          Paso_setError(IO_ERROR, "Paso_SystemMatrix_loadMM_toCSR: Could not read sparse matrix size.");
155                    Paso_MPIInfo_free(mpi_info);
156            fclose( fileHandle_p );
157            return NULL;
158        }
159        
160        /* Check whether we can handle current matrix size.
161          In the q_sort algorithm we use N*M+N expression which should be in the limits of "unsigned long".*/
162        if( M>=(ULONG_MAX-N)/N )  
163        {
164            Paso_setError(IO_ERROR, "Paso_SystemMatrix_loadMM_toCSR: Matrix size is too big.");
165                  Paso_MPIInfo_free(mpi_info);                  Paso_MPIInfo_free(mpi_info);
166          fclose( fileHandle_p );          fclose( fileHandle_p );
167          return NULL;          return NULL;
# Line 188  Paso_SystemMatrix* Paso_SystemMatrix_loa Line 201  Paso_SystemMatrix* Paso_SystemMatrix_loa
201          col_ind[i]--;          col_ind[i]--;
202      }      }
203      fclose( fileHandle_p );      fclose( fileHandle_p );
   
204      /* sort the entries */      /* sort the entries */
205      q_sort( row_ind, col_ind, val, 0, nz );      q_sort( row_ind, col_ind, val, 0, nz );
206        
207      /* setup row_ptr */      /* setup row_ptr */
208      curr_row = 0;      curr_row = 0;
209      for( i=0; (i<nz && curr_row<M); curr_row++ )      for( i=0; (i<nz && curr_row<M); curr_row++ )
210      {      {
211          while( row_ind[i] != curr_row )          while( row_ind[i] != curr_row ){
212              i++;              i++;
213            }
214          row_ptr[curr_row] = i;          row_ptr[curr_row] = i;
215      }      }
216      row_ptr[M] = nz;      row_ptr[M] = nz;
# Line 293  Paso_SystemMatrix* Paso_SystemMatrix_loa Line 306  Paso_SystemMatrix* Paso_SystemMatrix_loa
306          return NULL;          return NULL;
307      }      }
308    
309        /* Check whether we can handle current matrix size.
310          In the q_sort algorithm we use N*M+N expression which should be in the limits of "unsigned long".*/
311        if( M>=(ULONG_MAX-N)/N )  
312        {
313            Paso_setError(IO_ERROR, "Paso_SystemMatrix_loadMM_toCSC: Matrix size is too big.");
314                    Paso_MPIInfo_free(mpi_info);
315            fclose( fileHandle_p );
316            return NULL;
317        }
318    
319      /* prepare storage */      /* prepare storage */
320      col_ind = MEMALLOC( nz, index_t );      col_ind = MEMALLOC( nz, index_t );
321      row_ind = MEMALLOC( nz, index_t );      row_ind = MEMALLOC( nz, index_t );
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