Project into riemann sphere
double complex cproj(double complex z);
float complex cprojf(float complex z);
long double complex cprojl(long double complex z);
Link with -lm.
These functions project a point in the plane onto the surface of a Riemann Sphere, the one-point compactification of the complex plane. Each finite point z projects to z itself. Every complex infinite value is projected to a single infinite value, namely to positive infinity on the real axis.
These functions first appeared in glibc in version 2.1.
The cproj(), cprojf(), and cprojl() functions are thread-safe.
In glibc 2.11 and earlier, the implementation does something different (a stereographic projection onto a Riemann Sphere).
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