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

#include "lapacke_utils.h"

lapack_int LAPACKE_zhbgst_work( int matrix_layout, char vect, char uplo,
                                lapack_int n, lapack_int ka, lapack_int kb,
                                lapack_complex_double* ab, lapack_int ldab,
                                const lapack_complex_double* bb,
                                lapack_int ldbb, lapack_complex_double* x,
                                lapack_int ldx, lapack_complex_double* work,
                                double* rwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_zhbgst( &vect, &uplo, &n, &ka, &kb, ab, &ldab, bb, &ldbb, x,
                       &ldx, work, rwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldab_t = MAX(1,ka+1);
        lapack_int ldbb_t = MAX(1,kb+1);
        lapack_int ldx_t = MAX(1,n);
        lapack_complex_double* ab_t = NULL;
        lapack_complex_double* bb_t = NULL;
        lapack_complex_double* x_t = NULL;
        /* Check leading dimension(s) */
        if( ldab < n ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_zhbgst_work", info );
            return info;
        }
        if( ldbb < n ) {
            info = -10;
            LAPACKE_xerbla( "LAPACKE_zhbgst_work", info );
            return info;
        }
        if( ldx < n ) {
            info = -12;
            LAPACKE_xerbla( "LAPACKE_zhbgst_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        ab_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * ldab_t * MAX(1,n) );
        if( ab_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        bb_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * ldbb_t * MAX(1,n) );
        if( bb_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        if( LAPACKE_lsame( vect, 'v' ) ) {
            x_t = (lapack_complex_double*)
                LAPACKE_malloc( sizeof(lapack_complex_double) *
                                ldx_t * MAX(1,n) );
            if( x_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_2;
            }
        }
        /* Transpose input matrices */
        LAPACKE_zhb_trans( matrix_layout, uplo, n, ka, ab, ldab, ab_t, ldab_t );
        LAPACKE_zhb_trans( matrix_layout, uplo, n, kb, bb, ldbb, bb_t, ldbb_t );
        /* Call LAPACK function and adjust info */
        LAPACK_zhbgst( &vect, &uplo, &n, &ka, &kb, ab_t, &ldab_t, bb_t, &ldbb_t,
                       x_t, &ldx_t, work, rwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_zhb_trans( LAPACK_COL_MAJOR, uplo, n, ka, ab_t, ldab_t, ab,
                           ldab );
        if( LAPACKE_lsame( vect, 'v' ) ) {
            LAPACKE_zge_trans( LAPACK_COL_MAJOR, n, n, x_t, ldx_t, x, ldx );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( vect, 'v' ) ) {
            LAPACKE_free( x_t );
        }
exit_level_2:
        LAPACKE_free( bb_t );
exit_level_1:
        LAPACKE_free( ab_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_zhbgst_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_zhbgst_work", info );
    }
    return info;
}
