    /*
     * cblas_zhpr.c
     * The program is a C interface to zhpr.
     *
     * Keita Teranishi  3/23/98
     *
     */
    #include <stdio.h>
    #include <stdlib.h>
    #include "cblas.h"
    #include "cblas_f77.h"
    void cblas_zhpr(const enum CBLAS_ORDER order, const enum CBLAS_UPLO Uplo,
                    const int N, const double alpha, const void *X,
                    const int incX, void *A)
    {
       char UL;
    #ifdef F77_CHAR
       F77_CHAR F77_UL;
    #else
       #define F77_UL &UL
    #endif

    #ifdef F77_INT
       F77_INT F77_N=N, F77_incX=incX;
    #else
       #define F77_N N
       #define F77_incX incx
    #endif
       int n, i, tincx, incx=incX;
       double *x=(double *)X, *xx=(double *)X, *tx, *st;

       if (order == CblasColMajor)
       {
          if (Uplo == CblasLower) UL = 'L';
          else if (Uplo == CblasUpper) UL = 'U';
          else
          {
             cblas_xerbla(2, "cblas_zhpr","Illegal Uplo setting, %d\n",Uplo );
             return;
          }
          #ifdef F77_CHAR
             F77_UL = C2F_CHAR(&UL);
          #endif

          F77_zhpr(F77_UL, &F77_N, &alpha, X, &F77_incX, A);

       }  else if (order == CblasRowMajor)
       {
          if (Uplo == CblasUpper) UL = 'L';
          else if (Uplo == CblasLower) UL = 'U';
          else
          {
             cblas_xerbla(2, "cblas_zhpr","Illegal Uplo setting, %d\n", Uplo);
             return;
          }
          #ifdef F77_CHAR
             F77_UL = C2F_CHAR(&UL);
          #endif
          if (N > 0)
          {
             n = N << 1;
             x = malloc(n*sizeof(double));
             tx = x;
             if( incX > 0 ) {
                i = incX << 1;
                tincx = 2;
                st= x+n;
             } else {
                i = incX *(-2);
                tincx = -2;
                st = x-2;
                x +=(n-2);
             }
             do
             {
                *x = *xx;
                x[1] = -xx[1];
                x += tincx ;
                xx += i;
             }
             while (x != st);
             x=tx;
             #ifdef F77_INT
                F77_incX = 1;
             #else
                incx = 1;
             #endif
          }
          else x = (double *) X;

          F77_zhpr(F77_UL, &F77_N, &alpha, x, &F77_incX, A);

       } else
       {
          cblas_xerbla(1, "cblas_zhpr","Illegal Order setting, %d\n", order);
          return;
       }
       if(X!=x)
         free(x);
       return;
    }