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*****************************************************************************
* Contents: Native middle-level C interface to LAPACK function dtfsm
* Author: Intel Corporation
*****************************************************************************/

#include "lapacke_utils.h"

lapack_int LAPACKE_dtfsm_work( int matrix_layout, char transr, char side,
                               char uplo, char trans, char diag, lapack_int m,
                               lapack_int n, double alpha, const double* a,
                               double* b, lapack_int ldb )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dtfsm( &transr, &side, &uplo, &trans, &diag, &m, &n, &alpha, a,
                      b, &ldb );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldb_t = MAX(1,m);
        double* b_t = NULL;
        double* a_t = NULL;
        /* Check leading dimension(s) */
        if( ldb < n ) {
            info = -12;
            LAPACKE_xerbla( "LAPACKE_dtfsm_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,n) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        if( IS_D_NONZERO(alpha) ) {
            a_t = (double*)
                LAPACKE_malloc( sizeof(double) *
                                ( MAX(1,n) * MAX(2,n+1) ) / 2 );
            if( a_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_1;
            }
        }
        /* Transpose input matrices */
        if( IS_D_NONZERO(alpha) ) {
            LAPACKE_dge_trans( matrix_layout, m, n, b, ldb, b_t, ldb_t );
        }
        if( IS_D_NONZERO(alpha) ) {
            LAPACKE_dtf_trans( matrix_layout, transr, uplo, diag, n, a, a_t );
        }
        /* Call LAPACK function and adjust info */
        LAPACK_dtfsm( &transr, &side, &uplo, &trans, &diag, &m, &n, &alpha, a_t,
                      b_t, &ldb_t );
        info = 0;  /* LAPACK call is ok! */
        /* Transpose output matrices */
        LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, n, b_t, ldb_t, b, ldb );
        /* Release memory and exit */
        if( IS_D_NONZERO(alpha) ) {
            LAPACKE_free( a_t );
        }
exit_level_1:
        LAPACKE_free( b_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dtfsm_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dtfsm_work", info );
    }
    return info;
}
