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urbit/j/6/ut_swab.c

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/* j/6/swab.c
**
** This file is in the public domain.
*/
#include "all.h"
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/* internals
*/
/* functions
*/
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u3_noun
_cqfu_snub(u3_noun van,
u3_noun sut,
u3_noun har)
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{
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if ( c3n == u3du(har) ) {
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return u3_nul;
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} else {
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u3_noun i_har = u3h(har);
u3_noun t_har = u3t(har);
u3_noun pi_har = u3h(i_har);
u3_noun qi_har = u3t(i_har);
u3_noun peh = u3_cqb_flop(pi_har);
u3_noun ret = u3nc(u3nc(peh, u3k(qi_har)),
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_cqfu_snub
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(van, sut, t_har));
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return ret;
}
}
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/* boilerplate
*/
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u3_noun
u3_cwfu_snub(
u3_noun cor)
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{
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u3_noun van, sut, har;
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if ( (c3n == u3r_mean(cor, u3v_sam, &har,
u3v_con, &van,
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0)) ||
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(u3_none == (sut = u3r_at(u3v_sam, van))) )
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{
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return u3m_bail(c3__fail);
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} else {
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return _cqfu_snub(van, sut, har);
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}
}
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u3_noun
u3_cqfu_snub(u3_noun van,
u3_noun sut,
u3_noun har)
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{
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return _cqfu_snub(van, sut, har);
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}