tt3.c - plan9port - [fork] Plan 9 from user space
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       ---
       tt3.c (849B)
       ---
            1 #include "a.h"
            2 
            3 /*
            4  * Section 3 - page control (mostly irrelevant).
            5  */
            6 
            7 /* page offset */
            8 void
            9 po(int o)
           10 {
           11         nr(L(".o0"), getnr(L(".o")));
           12         nr(L(".o"), o);
           13 }
           14 
           15 void
           16 r_po(int argc, Rune **argv)
           17 {
           18         if(argc == 1){
           19                 po(getnr(L(".o0")));
           20                 return;
           21         }
           22         if(argv[1][0] == '+')
           23                 po(getnr(L(".o"))+evalscale(argv[1]+1, 'v'));
           24         else if(argv[1][0] == '-')
           25                 po(getnr(L(".o"))-evalscale(argv[1]+1, 'v'));
           26         else
           27                 po(evalscale(argv[1], 'v'));
           28 }
           29 
           30 /* .ne - need vertical space */
           31 /* .mk - mark current vertical place */
           32 /* .rt - return upward */
           33 
           34 void
           35 t3init(void)
           36 {
           37         nr(L(".o"), eval(L("1i")));
           38         nr(L(".o0"), eval(L("1i")));
           39         nr(L(".p"), eval(L("11i")));
           40 
           41         addreq(L("pl"), r_warn, -1);
           42         addreq(L("bp"), r_nop, -1);
           43         addreq(L("pn"), r_warn, -1);
           44         addreq(L("po"), r_po, -1);
           45         addreq(L("ne"), r_nop, -1);
           46         addreq(L("mk"), r_nop, -1);
           47         addreq(L("rt"), r_warn, -1);
           48 }