text: //------------------------------------------------------------------------------
  // GxB_Matrix_export_CSC: export a matrix in CSC format
  //------------------------------------------------------------------------------
  
  // SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
  // SPDX-License-Identifier: Apache-2.0
  
  //------------------------------------------------------------------------------
  
  #include "GB_export.h"
  
  #define GB_FREE_ALL ;
  
  GrB_Info GxB_Matrix_export_CSC  // export and free a CSC matrix
  (
      GrB_Matrix *A,      // handle of matrix to export and free
      GrB_Type *type,     // type of matrix exported
      GrB_Index *nrows,   // number of rows of the matrix
      GrB_Index *ncols,   // number of columns of the matrix
  
      GrB_Index **Ap,     // column "pointers"
      GrB_Index **Ai,     // row indices
      void **Ax,          // values
      GrB_Index *Ap_size, // size of Ap in bytes
      GrB_Index *Ai_size, // size of Ai in bytes
      GrB_Index *Ax_size, // size of Ax in bytes
      bool *iso,          // if true, A is iso
  
      bool *jumbled,      // if true, indices in each column may be unsorted
      const GrB_Descriptor desc
  )
  {
  
      //--------------------------------------------------------------------------
      // check inputs and get the descriptor
      //--------------------------------------------------------------------------
  
      GB_WHERE1 ("GxB_Matrix_export_CSC (&A, &type, &nrows, &ncols, "
          "&Ap, &Ai, &Ax, &Ap_size, &Ai_size, &Ax_size, &iso, "
          "&jumbled, desc)") ;
      GB_BURBLE_START ("GxB_Matrix_export_CSC") ;
      GB_RETURN_IF_NULL (A) ;
      GB_RETURN_IF_NULL_OR_FAULTY (*A) ;
      GB_GET_DESCRIPTOR (info, desc, xx1, xx2, xx3, xx4, xx5, xx6, xx7) ;
      ASSERT_MATRIX_OK (*A, "A to export as by-col", GB0) ;
  
      //--------------------------------------------------------------------------
      // ensure the matrix is in by-col format
      //--------------------------------------------------------------------------
  
      if (!((*A)->is_csc))
      { 
          // A = A', done in-place, to put A in by-col format
          GBURBLE ("(transpose) ") ;
          GB_OK (GB_transpose_in_place (*A, true, Context)) ;
      }
  
      //--------------------------------------------------------------------------
      // finish any pending work
      //--------------------------------------------------------------------------
  
      if (jumbled == NULL)
      { 
          // the exported matrix cannot be jumbled
          GB_MATRIX_WAIT (*A) ;
      }
      else
      { 
          // the exported matrix is allowed to be jumbled
          GB_MATRIX_WAIT_IF_PENDING_OR_ZOMBIES (*A) ;
      }
  
      //--------------------------------------------------------------------------
      // ensure the matrix is sparse
      //--------------------------------------------------------------------------
  
      GB_OK (GB_convert_any_to_sparse (*A, Context)) ;
  
      //--------------------------------------------------------------------------
      // export the matrix
      //--------------------------------------------------------------------------
  
      ASSERT (GB_IS_SPARSE (*A)) ;
      ASSERT (((*A)->is_csc)) ;
      ASSERT (!GB_ZOMBIES (*A)) ;
      ASSERT (GB_IMPLIES (jumbled == NULL, !GB_JUMBLED (*A))) ;
      ASSERT (!GB_PENDING (*A)) ;
  
      int sparsity ;
      bool is_csc ;
  
      info = GB_export (false, A, type, nrows, ncols, false,
          Ap,   Ap_size,  // Ap
          NULL, NULL,     // Ah
          NULL, NULL,     // Ab
          Ai,   Ai_size,  // Ai
          Ax,   Ax_size,  // Ax
          NULL, jumbled, NULL,                // jumbled or not
          &sparsity, &is_csc,                 // sparse by col
          iso, Context) ;
  
      if (info == GrB_SUCCESS)
      {
          ASSERT (sparsity == GxB_SPARSE) ;
          ASSERT (is_csc) ;
      }
      GB_BURBLE_END ;
      return (info) ;
  }
  
  