text: #include "blaswrap.h"
  #include "f2c.h"
  
  doublereal dznrm2_(integer *n, doublecomplex *x, integer *incx)
  {
  /*        The following loop is equivalent to this call to the LAPACK   
            auxiliary routine:   
            CALL ZLASSQ( N, X, INCX, SCALE, SSQ ) */
      /* System generated locals */
      integer i__1, i__2, i__3;
      doublereal ret_val, d__1;
      /* Builtin functions */
      double d_imag(doublecomplex *), sqrt(doublereal);
      /* Local variables */
      static integer ix;
      static doublereal ssq, temp, norm, scale;
  /*  Purpose   
      =======   
      DZNRM2 returns the euclidean norm of a vector via the function   
      name, so that   
         DZNRM2 := sqrt( conjg( x' )*x )   
      -- This version written on 25-October-1982.   
         Modified on 14-October-1993 to inline the call to ZLASSQ.   
         Sven Hammarling, Nag Ltd.   
         Parameter adjustments */
      --x;
      /* Function Body */
      if (*n < 1 || *incx < 1) {
  	norm = 0.;
      } else {
  	scale = 0.;
  	ssq = 1.;
  
  
  	i__1 = (*n - 1) * *incx + 1;
  	i__2 = *incx;
  	for (ix = 1; i__2 < 0 ? ix >= i__1 : ix <= i__1; ix += i__2) {
  	    i__3 = ix;
  	    if (x[i__3].r != 0.) {
  		i__3 = ix;
  		temp = (d__1 = x[i__3].r, abs(d__1));
  		if (scale < temp) {
  /* Computing 2nd power */
  		    d__1 = scale / temp;
  		    ssq = ssq * (d__1 * d__1) + 1.;
  		    scale = temp;
  		} else {
  /* Computing 2nd power */
  		    d__1 = temp / scale;
  		    ssq += d__1 * d__1;
  		}
  	    }
  	    if (d_imag(&x[ix]) != 0.) {
  		temp = (d__1 = d_imag(&x[ix]), abs(d__1));
  		if (scale < temp) {
  /* Computing 2nd power */
  		    d__1 = scale / temp;
  		    ssq = ssq * (d__1 * d__1) + 1.;
  		    scale = temp;
  		} else {
  /* Computing 2nd power */
  		    d__1 = temp / scale;
  		    ssq += d__1 * d__1;
  		}
  	    }
  /* L10: */
  	}
  	norm = scale * sqrt(ssq);
      }
  
      ret_val = norm;
      return ret_val;
  
  /*     End of DZNRM2. */
  
  } /* dznrm2_ */
  