urbit/jets/b/roll.c

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/* j/2/roll.c
**
*/
#include "all.h"
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/* functions
*/
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u3_noun
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u3qb_roll(u3_noun a,
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u3_noun b)
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{
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if ( 0 == a ) {
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return u3k(u3r_at(u3x_sam_3, b));
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}
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else if ( c3n == u3du(a) ) {
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return u3m_bail(c3__exit);
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}
else {
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u3_noun gim = u3k(u3h(a));
u3_noun zor = u3r_at(u3x_sam, b);
if ( c3n == u3du(zor) ) {
return u3m_bail(c3__exit);
}
u3_noun daz = u3n_slam_on(u3k(b), u3nc(gim, u3k(u3t(zor))));
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u3_noun vel = u3i_molt(u3k(b), u3x_sam_3, daz, 0);
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if ( u3_none == vel ) {
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return u3m_bail(c3__exit);
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} else {
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u3_noun hox = u3qb_roll(u3t(a), vel);
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u3z(vel);
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return hox;
}
}
}
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u3_noun
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u3wb_roll(u3_noun cor)
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{
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u3_noun a, b;
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if ( c3n == u3r_mean(cor, u3x_sam_2, &a, u3x_sam_3, &b, 0) ) {
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return u3m_bail(c3__exit);
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} else {
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return u3qb_roll(a, b);
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}
}