urbit/j/c/lsh.c
2014-11-17 13:56:51 -08:00

69 lines
1.3 KiB
C

/* j/3/lsh.c
**
** This file is in the public domain.
*/
#include "all.h"
/* functions
*/
u3_noun
u3qc_lsh(u3_atom a, u3_atom b, u3_atom c)
{
if ( !_(u3a_is_cat(a)) || (a >= 32) ) {
return u3m_bail(c3__fail);
}
else if ( !_(u3a_is_cat(b)) ) {
return u3m_bail(c3__fail);
}
else {
c3_g a_g = a;
c3_w b_w = b;
c3_w len_w = u3r_met(a_g, c);
if ( 0 == len_w ) {
return 0;
}
else if ( (b_w + len_w) < len_w ) {
return u3m_bail(c3__exit);
}
else {
c3_w* sal_w = u3a_slaq(a_g, (b_w + len_w));
if ( 0 == sal_w ) {
return u3m_bail(c3__fail);
}
u3r_chop(a_g, 0, len_w, b_w, sal_w, c);
// return u3a_moot(sal_w);
return u3a_malt(sal_w);
}
}
}
u3_noun
u3wc_lsh(u3_noun cor)
{
u3_noun a, b, c;
if ( (c3n == u3r_mean(cor, u3x_sam_2, &a,
u3x_sam_6, &b,
u3x_sam_7, &c, 0)) ||
(c3n == u3ud(a)) ||
(c3n == u3ud(b)) ||
(c3n == u3ud(c)) )
{
return u3m_bail(c3__exit);
} else {
return u3qc_lsh(a, b, c);
}
}
u3_noun
u3kc_lsh(u3_noun a, u3_noun b, u3_noun c)
{
u3_noun d = u3qc_lsh(a, b, c);
u3z(a); u3z(b); u3z(c);
return d;
}