mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-21 08:24:10 +01:00
31 lines
490 B
C
31 lines
490 B
C
#include "f2c.h"
|
|
|
|
#undef abs
|
|
#include "math.h"
|
|
extern double f__cabs (double, double);
|
|
|
|
void
|
|
c_sqrt (complex * r, complex * z)
|
|
{
|
|
double mag, t;
|
|
double zi = z->i, zr = z->r;
|
|
|
|
if ((mag = f__cabs (zr, zi)) == 0.)
|
|
r->r = r->i = 0.;
|
|
else if (zr > 0)
|
|
{
|
|
r->r = t = sqrt (0.5 * (mag + zr));
|
|
t = zi / t;
|
|
r->i = 0.5 * t;
|
|
}
|
|
else
|
|
{
|
|
t = sqrt (0.5 * (mag - zr));
|
|
if (zi < 0)
|
|
t = -t;
|
|
r->i = t;
|
|
t = zi / t;
|
|
r->r = 0.5 * t;
|
|
}
|
|
}
|