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

#include "lapacke_utils.h"

lapack_int LAPACKE_ztgsna( int matrix_layout, char job, char howmny,
                           const lapack_logical* select, lapack_int n,
                           const lapack_complex_double* a, lapack_int lda,
                           const lapack_complex_double* b, lapack_int ldb,
                           const lapack_complex_double* vl, lapack_int ldvl,
                           const lapack_complex_double* vr, lapack_int ldvr,
                           double* s, double* dif, lapack_int mm,
                           lapack_int* m )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    lapack_int* iwork = NULL;
    lapack_complex_double* work = NULL;
    lapack_complex_double work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_ztgsna", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_zge_nancheck( matrix_layout, n, n, a, lda ) ) {
            return -6;
        }
        if( LAPACKE_zge_nancheck( matrix_layout, n, n, b, ldb ) ) {
            return -8;
        }
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'e' ) ) {
            if( LAPACKE_zge_nancheck( matrix_layout, n, mm, vl, ldvl ) ) {
                return -10;
            }
        }
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'e' ) ) {
            if( LAPACKE_zge_nancheck( matrix_layout, n, mm, vr, ldvr ) ) {
                return -12;
            }
        }
    }
#endif
    /* Allocate memory for working array(s) */
    if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'v' ) ) {
        iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,n+2) );
        if( iwork == NULL ) {
            info = LAPACK_WORK_MEMORY_ERROR;
            goto exit_level_0;
        }
    }
    /* Query optimal working array(s) size */
    info = LAPACKE_ztgsna_work( matrix_layout, job, howmny, select, n, a, lda, b,
                                ldb, vl, ldvl, vr, ldvr, s, dif, mm, m,
                                &work_query, lwork, iwork );
    if( info != 0 ) {
        goto exit_level_1;
    }
    lwork = LAPACK_Z2INT( work_query );
    /* Allocate memory for work arrays */
    if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'v' ) ) {
        work = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * lwork );
        if( work == NULL ) {
            info = LAPACK_WORK_MEMORY_ERROR;
            goto exit_level_1;
        }
    }
    /* Call middle-level interface */
    info = LAPACKE_ztgsna_work( matrix_layout, job, howmny, select, n, a, lda, b,
                                ldb, vl, ldvl, vr, ldvr, s, dif, mm, m, work,
                                lwork, iwork );
    /* Release memory and exit */
    if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'v' ) ) {
        LAPACKE_free( work );
    }
exit_level_1:
    if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'v' ) ) {
        LAPACKE_free( iwork );
    }
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_ztgsna", info );
    }
    return info;
}
