usr/src/cmd/eqn/fromto.c

   1 /*
   2  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
   7 /*        All Rights Reserved   */
   8
   9 /*
  10  * Copyright (c) 1980 Regents of the University of California.
  11  * All rights reserved. The Berkeley software License Agreement
  12  * specifies the terms and conditions for redistribution.
  13  */
  14
  15 #pragma ident   "%Z%%M% %I%     %E% SMI"
  16
  17 #include "e.h"
  18
  19 void
  20 fromto(int p1, int p2, int p3)
  21 {
  22         int b, h1, b1, pss;
  23         yyval = oalloc();
  24         lfont[yyval] = rfont[yyval] = 0;
  25         h1 = eht[yyval] = eht[p1];
  26         b1 = ebase[p1];
  27         b = 0;
  28         pss = EFFPS(ps);
  29         ps += 3;
  30         nrwid(p1, ps, p1);
  31         printf(".nr %d \\n(%d\n", yyval, p1);
  32         if (p2 > 0) {
  33                 nrwid(p2, pss, p2);
  34                 printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n",
  35                     p2, yyval, yyval, p2);
  36                 eht[yyval] += eht[p2];
  37                 b = eht[p2];
  38         }
  39         if (p3 > 0) {
  40                 nrwid(p3, pss, p3);
  41                 printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n",
  42                     p3, yyval, yyval, p3);
  43                 eht[yyval] += eht[p3];
  44         }
  45         printf(".ds %d ", yyval);       /* bottom of middle box */
  46         if (p2 > 0) {
  47                 printf("\\v'%du'\\h'\\n(%du-\\n(%du/2u'\\s%d\\*(%d\\s%d",
  48                     eht[p2]-ebase[p2]+b1, yyval, p2, pss, p2, EFFPS(ps));
  49                 printf("\\h'-\\n(%du-\\n(%du/2u'\\v'%du'\\\n",
  50                     yyval, p2, -(eht[p2]-ebase[p2]+b1));
  51         }
  52 #ifndef NEQN
  53         printf("\\h'\\n(%du-\\n(%du/2u'\\*(%d\\h'\\n(%du-\\n(%du/2u'\\\n",
  54             yyval, p1, p1, yyval, p1);
  55 #else   /* NEQN */
  56         printf("\\h'\\n(%du-\\n(%du/2u'\\*(%d\\h'\\n(%du-\\n(%du+2u/2u'\\\n",
  57             yyval, p1, p1, yyval, p1);
  58 #endif  /* NEQN */
  59         if (p3 > 0) {
  60                 printf("\\v'%du'\\h'-\\n(%du-\\n(%du/2u'\\s%d\\*(%d\\s%d"
  61                     "\\h'\\n(%du-\\n(%du/2u'\\v'%du'\\\n",
  62                     -(h1-b1+ebase[p3]), yyval, p3, pss, p3, EFFPS(ps),
  63                     yyval, p3, (h1-b1+ebase[p3]));
  64         }
  65         printf("\n");
  66         ebase[yyval] = b + b1;
  67         if (dbg)
  68                 printf(".\tfrom to: S%d <- %d f %d t %d; h=%d b=%d\n",
  69                     yyval, p1, p2, p3, eht[yyval], ebase[yyval]);
  70         ofree(p1);
  71         if (p2 > 0) ofree(p2);
  72         if (p3 > 0) ofree(p3);
  73 }