# dlib C++ Library - cblas_zgerc.c

    /*
     * cblas_zgerc.c
     * The program is a C interface to zgerc.
     *
     * Keita Teranishi  5/20/98
     *
     */
    #include <stdio.h>
    #include <stdlib.h>
    #include "cblas.h"
    #include "cblas_f77.h"
    void cblas_zgerc(const enum CBLAS_ORDER order, const CBLAS_INT_TYPE M, const CBLAS_INT_TYPE N,
                     const void *alpha, const void *X, const CBLAS_INT_TYPE incX,
                     const void *Y, const CBLAS_INT_TYPE incY, void *A, const CBLAS_INT_TYPE lda)
    {
    #ifdef F77_INT
       F77_INT F77_M=M, F77_N=N, F77_lda=lda, F77_incX=incX, F77_incY=incY;
    #else
       #define F77_M M
       #define F77_N N
       #define F77_incX incX
       #define F77_incY incy
       #define F77_lda lda
    #endif

       CBLAS_INT_TYPE n, i, tincy, incy=incY;
       double *y=(double *)Y, *yy=(double *)Y, *ty, *st;

       if (order == CblasColMajor)
       {
          F77_zgerc( &F77_M, &F77_N, alpha, X, &F77_incX, Y, &F77_incY, A,
                          &F77_lda);
       }  else if (order == CblasRowMajor)
       {
          if (N > 0)
          {
             n = N << 1;
             y = malloc(n*sizeof(double));

             ty = y;
             if( incY > 0 ) {
                i = incY << 1;
                tincy = 2;
                st= y+n;
             } else {
                i = incY *(-2);
                tincy = -2;
                st = y-2;
                y +=(n-2);
             }
             do
             {
                *y = *yy;
                y[1] = -yy[1];
                y += tincy ;
                yy += i;
             }
             while (y != st);
             y = ty;

             #ifdef F77_INT
                F77_incY = 1;
             #else
                incy = 1;
             #endif
          }
          else y = (double *) Y;

          F77_zgeru( &F77_N, &F77_M, alpha, y, &F77_incY, X, &F77_incX, A,
                          &F77_lda);
          if(Y!=y)
             free(y);

       } else cblas_xerbla(1, "cblas_zgerc", "Illegal Order setting, %d\n", order);
       return;
    }