shrub/j/3/cut.c
2014-09-05 12:55:16 -07:00

75 lines
1.5 KiB
C

/* j/3/cut.c
**
** This file is in the public domain.
*/
#include "all.h"
/* functions
*/
u2_noun
u2_cqc_cut(
u2_atom a,
u2_atom b,
u2_atom c,
u2_atom d)
{
if ( u2_ne(u2_co_is_cat(a)) || (a >= 32) ) {
return u2_cm_bail(c3__fail);
}
if ( u2_ne(u2_co_is_cat(b)) ) {
return 0;
}
if ( u2_ne(u2_co_is_cat(c)) ) {
c = 0x7fffffff;
}
{
c3_g a_g = a;
c3_w b_w = b;
c3_w c_w = c;
c3_w len_w = u2_cr_met(a_g, d);
if ( (0 == c_w) || (b_w >= len_w) ) {
return 0;
}
if ( b_w + c_w > len_w ) {
c_w = (len_w - b_w);
}
if ( (b_w == 0) && (c_w == len_w) ) {
return u2k(d);
}
else {
c3_w* sal_w = u2_ca_slaq(a_g, c_w);
if ( 0 == sal_w ) {
return u2_cm_bail(c3__fail);
}
u2_cr_chop(a_g, b_w, c_w, 0, sal_w, d);
return u2_ca_malt(sal_w);
}
}
}
u2_noun
u2_cwc_cut(
u2_noun cor)
{
u2_noun a, b, c, d;
if ( (u2_no == u2_cr_mean(cor, u2_cv_sam_2, &a,
u2_cv_sam_12, &b,
u2_cv_sam_13, &c,
u2_cv_sam_7, &d, 0)) ||
(u2_no == u2ud(a)) ||
(u2_no == u2ud(b)) ||
(u2_no == u2ud(c)) ||
(u2_no == u2ud(d)) )
{
return u2_cm_bail(c3__exit);
} else {
return u2_cqc_cut(a, b, c, d);
}
}