| 1 | #include "f2c.h"
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| 2 |
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| 3 | extern void sig_die (char *, int);
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| 4 | void
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| 5 | z_div (doublecomplex * c, doublecomplex * a, doublecomplex * b)
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| 6 | {
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| 7 | double ratio, den;
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| 8 | double abr, abi, cr;
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| 9 |
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| 10 | if ((abr = b->r) < 0.)
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| 11 | abr = -abr;
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| 12 | if ((abi = b->i) < 0.)
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| 13 | abi = -abi;
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| 14 | if (abr <= abi)
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| 15 | {
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| 16 | if (abi == 0)
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| 17 | {
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| 18 | #ifdef IEEE_COMPLEX_DIVIDE
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| 19 | if (a->i != 0 || a->r != 0)
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| 20 | abi = 1.;
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| 21 | c->i = c->r = abi / abr;
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| 22 | return;
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| 23 | #else
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| 24 | sig_die ("complex division by zero", 1);
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| 25 | #endif
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| 26 | }
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| 27 | ratio = b->r / b->i;
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| 28 | den = b->i * (1 + ratio * ratio);
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| 29 | cr = (a->r * ratio + a->i) / den;
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| 30 | c->i = (a->i * ratio - a->r) / den;
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| 31 | }
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| 32 |
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| 33 | else
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| 34 | {
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