freebsd-dev/contrib/libf2c/libF77/c_log.c

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#include "f2c.h"
#ifdef KR_headers
extern double log(), f__cabs(), atan2();
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VOID c_log(r, z) complex *r, *z;
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#else
#undef abs
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#include "math.h"
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extern double f__cabs(double, double);
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void c_log(complex *r, complex *z)
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#endif
{
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double zi, zr;
r->i = atan2(zi = z->i, zr = z->r);
r->r = log( f__cabs(zr, zi) );
}