#include "blaswrap.h"
#include "f2c.h"

/* Subroutine */ int srot_(integer *n, real *sx, integer *incx, real *sy, 
	integer *incy, real *c__, real *s)
{
    /* System generated locals */
    integer i__1;
    /* Local variables */
    static integer i__;
    static real stemp;
    static integer ix, iy;
/*     applies a plane rotation.   
       jack dongarra, linpack, 3/11/78.   
       modified 12/3/93, array(1) declarations changed to array(*)   
       Parameter adjustments */
    --sy;
    --sx;
    /* Function Body */
    if (*n <= 0) {
	return 0;
    }
    if (*incx == 1 && *incy == 1) {
	goto L20;
    }
/*       code for unequal increments or equal increments not equal   
           to 1 */
    ix = 1;
    iy = 1;
    if (*incx < 0) {
	ix = (-(*n) + 1) * *incx + 1;
    }
    if (*incy < 0) {
	iy = (-(*n) + 1) * *incy + 1;
    }
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
	stemp = *c__ * sx[ix] + *s * sy[iy];
	sy[iy] = *c__ * sy[iy] - *s * sx[ix];
	sx[ix] = stemp;
	ix += *incx;
	iy += *incy;
/* L10: */
    }
    return 0;
/*       code for both increments equal to 1 */
L20:
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
	stemp = *c__ * sx[i__] + *s * sy[i__];
	sy[i__] = *c__ * sy[i__] - *s * sx[i__];
	sx[i__] = stemp;
/* L30: */
    }
    return 0;
} /* srot_ */

