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* Contents: Native middle-level C interface to LAPACK function dlangb
* Author: Simon Märtens
*****************************************************************************/

#include "lapacke_utils.h"

double LAPACKE_dlangb_work( int matrix_layout, char norm, lapack_int n,
                            lapack_int kl, lapack_int ku, const double* ab,
                            lapack_int ldab, double* work )
{
    lapack_int info = 0;
    double res = 0.;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        res = LAPACK_dlangb( &norm, &n, &kl, &ku, ab, &ldab, work );
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        char norm_lapack;
        double* work_lapack = NULL;
        /* Check leading dimension(s) */
        if( ldab < kl+ku+1 ) {
            info = -7;
            LAPACKE_xerbla( "LAPACKE_dlangb_work", info );
            return info;
        }
        if( LAPACKE_lsame( norm, '1' ) || LAPACKE_lsame( norm, 'o' ) ) {
            norm_lapack = 'i';
        } else if( LAPACKE_lsame( norm, 'i' ) ) {
            norm_lapack = '1';
        } else {
            norm_lapack = norm;
        }
        /* Allocate memory for work array(s) */
        if( LAPACKE_lsame( norm_lapack, 'i' ) ) {
            work_lapack = (double*)LAPACKE_malloc( sizeof(double) * MAX(1,n) );
            if( work_lapack == NULL ) {
                info = LAPACK_WORK_MEMORY_ERROR;
                goto exit_level_0;
            }
        }
        /* Call LAPACK function */
        res = LAPACK_dlangb( &norm, &n, &ku, &kl, ab, &ldab, work );
        /* Release memory and exit */
        if( work_lapack ) {
            LAPACKE_free( work_lapack );
        }
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dlangb_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dlangb_work", info );
    }
    return res;
}
