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*****************************************************************************
* Contents: Native high-level C interface to LAPACK function dstebz
* Author: Intel Corporation
*****************************************************************************/

#include "lapacke_utils.h"

lapack_int LAPACKE_dstebz( char range, char order, lapack_int n, double vl,
                           double vu, lapack_int il, lapack_int iu,
                           double abstol, const double* d, const double* e,
                           lapack_int* m, lapack_int* nsplit, double* w,
                           lapack_int* iblock, lapack_int* isplit )
{
    lapack_int info = 0;
    lapack_int* iwork = NULL;
    double* work = NULL;
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_d_nancheck( 1, &abstol, 1 ) ) {
            return -8;
        }
        if( LAPACKE_d_nancheck( n, d, 1 ) ) {
            return -9;
        }
        if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
            return -10;
        }
        if( LAPACKE_lsame( range, 'v' ) ) {
            if( LAPACKE_d_nancheck( 1, &vl, 1 ) ) {
                return -4;
            }
        }
        if( LAPACKE_lsame( range, 'v' ) ) {
            if( LAPACKE_d_nancheck( 1, &vu, 1 ) ) {
                return -5;
            }
        }
    }
#endif
    /* Allocate memory for working array(s) */
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,3*n) );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    work = (double*)LAPACKE_malloc( sizeof(double) * MAX(1,4*n) );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_dstebz_work( range, order, n, vl, vu, il, iu, abstol, d, e,
                                m, nsplit, w, iblock, isplit, work, iwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_1:
    LAPACKE_free( iwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dstebz", info );
    }
    return info;
}
