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

#include "lapacke_utils.h"

lapack_int LAPACKE_zstein( int matrix_layout, lapack_int n, const double* d,
                           const double* e, lapack_int m, const double* w,
                           const lapack_int* iblock, const lapack_int* isplit,
                           lapack_complex_double* z, lapack_int ldz,
                           lapack_int* ifailv )
{
    lapack_int info = 0;
    lapack_int* iwork = NULL;
    double* work = NULL;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_zstein", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_d_nancheck( n, d, 1 ) ) {
            return -3;
        }
        if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
            return -4;
        }
        if( LAPACKE_d_nancheck( n, w, 1 ) ) {
            return -6;
        }
    }
#endif
    /* Allocate memory for working array(s) */
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,n) );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    work = (double*)LAPACKE_malloc( sizeof(double) * MAX(1,5*n) );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_zstein_work( matrix_layout, n, d, e, m, w, iblock, isplit, z,
                                ldz, work, iwork, ifailv );
    /* 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_zstein", info );
    }
    return info;
}
