tfromto.c - plan9port - [fork] Plan 9 from user space
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       ---
       tfromto.c (1442B)
       ---
            1 # include "e.h"
            2 
            3 void fromto(int p1, int p2, int p3)
            4 {
            5         double b, h1, b1, t;
            6         int subps;
            7 
            8         yyval = salloc();
            9         lfont[yyval] = rfont[yyval] = 0;
           10         h1 = eht[yyval] = eht[p1];
           11         b1 = ebase[p1];
           12         b = 0;
           13         subps = ps;
           14         ps += deltaps;
           15         nrwid(p1, ps, p1);
           16         printf(".nr %d \\n(%d\n", (int)yyval, p1);
           17         if (p2 > 0) {
           18                 nrwid(p2, subps, p2);
           19                 printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, (int)yyval, (int)yyval, p2);
           20                 eht[yyval] += eht[p2];
           21                 b = eht[p2];
           22         }
           23         if (p3 > 0) {
           24                 nrwid(p3, subps, p3);
           25                 printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p3, (int)yyval, (int)yyval, p3);
           26                 eht[yyval] += eht[p3];
           27         }
           28         printf(".ds %d ", (int)yyval);        /* bottom of middle box */
           29         if (p2 > 0) {
           30                 t = eht[p2]-ebase[p2]+b1;
           31                 printf("\\v'%gm'\\h'\\n(%du-\\n(%du/2u'%s\\*(%d%s",
           32                         REL(t,ps), (int)yyval, p2, DPS(ps,subps), p2, DPS(subps,ps));
           33                 printf("\\h'-\\n(%du-\\n(%du/2u'\\v'%gm'\\\n",
           34                         (int)yyval, p2, REL(-t,ps));
           35         }
           36         printf("\\h'\\n(%du-\\n(%du/2u'\\*(%d\\h'\\n(%du-\\n(%du/2u'\\\n",
           37                 (int)yyval, p1, p1, (int)yyval, p1);
           38         if (p3  >0) {
           39                 t = h1-b1+ebase[p3];
           40                 printf("\\v'%gm'\\h'-\\n(%du-\\n(%du/2u'%s\\*(%d%s\\h'\\n(%du-\\n(%du/2u'\\v'%gm'\\\n",
           41                         REL(-t,ps), (int)yyval, p3, DPS(ps,subps), p3, DPS(subps,ps), (int)yyval, p3, REL(t,ps));
           42         }
           43         printf("\n");
           44         ebase[yyval] = b + b1;
           45         dprintf(".\tS%d <- %d from %d to %d; h=%g b=%g\n",
           46                 (int)yyval, p1, p2, p3, eht[yyval], ebase[yyval]);
           47         sfree(p1);
           48         if (p2 > 0)
           49                 sfree(p2);
           50         if (p3 > 0)
           51                 sfree(p3);
           52 }