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#include "a.h"
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/*
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 * Section 3 - page control (mostly irrelevant).
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 */
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/* page offset */
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void
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po(int o)
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{
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	nr(L(".o0"), getnr(L(".o")));
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	nr(L(".o"), o);
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}
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void
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r_po(int argc, Rune **argv)
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{
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	if(argc == 1){
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		po(getnr(L(".o0")));
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		return;
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	}
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	if(argv[1][0] == '+')
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		po(getnr(L(".o"))+evalscale(argv[1]+1, 'v'));
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	else if(argv[1][0] == '-')
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		po(getnr(L(".o"))-evalscale(argv[1]+1, 'v'));
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	else
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		po(evalscale(argv[1], 'v'));
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}
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/* .ne - need vertical space */
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/* .mk - mark current vertical place */
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/* .rt - return upward */
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void
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t3init(void)
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{
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	nr(L(".o"), eval(L("1i")));
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	nr(L(".o0"), eval(L("1i")));
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	nr(L(".p"), eval(L("11i")));
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	addreq(L("pl"), r_warn, -1);
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	addreq(L("bp"), r_nop, -1);
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	addreq(L("pn"), r_warn, -1);
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	addreq(L("po"), r_po, -1);
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	addreq(L("ne"), r_nop, -1);
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	addreq(L("mk"), r_nop, -1);
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	addreq(L("rt"), r_warn, -1);
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}
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