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56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
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/* j/1/dec.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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#include "../pit.h"
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/* functions
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*/
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u2_weak // transfer
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j2_mbc(Pt1, inc)(u2_wire wir_r,
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u2_atom a) // retain
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{
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return u2_rl_vint(wir_r, u2_rx(wir_r, a));
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}
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u2_weak // transfer
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j2_mbc(Pt1, dec)(u2_wire wir_r,
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u2_atom a) // retain
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{
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if ( _0 == a ) {
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return u2_bl_error(wir_r, "decrement-underflow");
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return u2_bl_bail(wir_r, c3__exit);
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}
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else {
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mpz_t a_mp;
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u2_mp(a_mp, a);
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mpz_sub_ui(a_mp, a_mp, 1);
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return u2_rl_mp(wir_r, a_mp);
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}
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}
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u2_weak // transfer
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j2_mb(Pt1, dec)(u2_wire wir_r,
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u2_noun cor) // retain
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{
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u2_noun a;
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if ( (u2_none == (a = u2_frag(u2_cv_sam, cor))) ||
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(u2_no == u2_stud(a)) )
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{
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return u2_bl_bail(wir_r, c3__exit);
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} else {
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return j2_mbc(Pt1, dec)(wir_r, a);
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}
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}
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/* structures
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*/
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u2_ho_jet
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j2_mbj(Pt1, dec)[] = {
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{ ".2", c3__lite, j2_mb(Pt1, dec), u2_jet_live, u2_none, u2_none },
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{ }
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};
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