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46 lines
801 B
C
46 lines
801 B
C
/* j/2/snag.c
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**
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** This file is in the public domain.
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*/
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#include "all.h"
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/* functions
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*/
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u3_noun
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u3_cqb_snag(u3_atom a,
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u3_noun b)
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{
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if ( u3_ne(u3_co_is_cat(a)) ) {
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return u3_cm_bail(c3__fail);
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}
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else {
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c3_w len_w = a;
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while ( len_w ) {
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if ( u3_no == u3du(b) ) {
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return u3_cm_bail(c3__exit);
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}
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b = u3t(b);
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len_w--;
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}
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if ( u3_no == u3du(b) ) {
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return u3_cm_bail(c3__exit);
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}
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return u3k(u3h(b));
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}
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}
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u3_noun
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u3_cwb_snag(u3_noun cor)
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{
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u3_noun a, b;
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if ( (u3_no == u3_cr_mean(cor, u3_cv_sam_2, &a, u3_cv_sam_3, &b, 0)) ||
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(u3_no == u3ud(a)) )
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{
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return u3_cm_bail(c3__exit);
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} else {
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return u3_cqb_snag(a, b);
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}
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}
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