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urbit/j/c/end.c
2014-11-06 11:49:41 -08:00

64 lines
1.2 KiB
C

/* j/3/end.c
**
** This file is in the public domain.
*/
#include "all.h"
/* functions
*/
u3_noun
u3qc_end(
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 u3k(c);
}
else {
c3_g a_g = a;
c3_w b_w = b;
c3_w len_w = u3r_met(a_g, c);
if ( 0 == b_w ) {
return 0;
}
else if ( b_w >= len_w ) {
return u3k(c);
}
else {
c3_w* sal_w = u3a_slaq(a_g, b_w);
if ( 0 == sal_w ) {
return u3m_bail(c3__fail);
}
u3r_chop(a_g, 0, b_w, 0, sal_w, c);
return u3a_malt(sal_w);
}
}
}
u3_noun
u3wc_end(
u3_noun cor)
{
u3_noun a, b, c;
if ( (c3n == u3r_mean(cor, u3v_sam_2, &a,
u3v_sam_6, &b,
u3v_sam_7, &c, 0)) ||
(c3n == u3ud(a)) ||
(c3n == u3ud(b)) ||
(c3n == u3ud(c)) )
{
return u3m_bail(c3__exit);
} else {
return u3qc_end(a, b, c);
}
}