2.9BSD - /usr/src/cmd/neqn/shift.c

   1: # include "e.h"
   2: #include "e.def"
   3: 
   4: bshiftb(p1, dir, p2) int p1, dir, p2; {
   5:     int shval, d1, h1, b1, h2, b2;
   6:     yyval = p1;
   7:     h1 = eht[p1];
   8:     b1 = ebase[p1];
   9:     h2 = eht[p2];
  10:     b2 = ebase[p2];
  11:     if( dir == SUB ) {  /* subscript */
  12:         d1 = VERT(1);
  13:         shval = - d1 + h2 - b2;
  14:         if( d1+b1 > h2 ) /* move little sub down */
  15:             shval = b1-b2;
  16:         ebase[yyval] = b1 + max(0, h2-b1-d1);
  17:         eht[yyval] = h1 + max(0, h2-b1-d1);
  18:     } else {    /* superscript */
  19:         d1 = VERT(1);
  20:         ebase[yyval] = b1;
  21:         shval = -VERT(1) - b2;
  22:         if( VERT(1) + h2 < h1-b1 )  /* raise little super */
  23:             shval = -(h1-b1) + h2-b2 - d1;
  24:         eht[yyval] = h1 + max(0, h2 - VERT(1));
  25:     }
  26:     if(dbg)printf(".\tb:b shift b: S%d <- S%d vert %d S%d vert %d; b=%d, h=%d\n",
  27:         yyval, p1, shval, p2, -shval, ebase[yyval], eht[yyval]);
  28:     printf(".as %d \\v'%du'\\*(%d\\v'%du'\n",
  29:         yyval, shval, p2, -shval);
  30:     ofree(p2);
  31: }
  32: 
  33: shift(p1) int p1; {
  34:     ps -= deltaps;
  35:     yyval = p1;
  36:     if(dbg)printf(".\tshift: %d;ps=%d\n", yyval, ps);
  37: }
  38: 
  39: shift2(p1, p2, p3) int p1, p2, p3; {
  40:     int effps, h1, h2, h3, b1, b2, b3, subsh, d1, d2, supsh;
  41:     int treg;
  42: 
  43:     treg = oalloc();
  44:     yyval = p1;
  45:     if(dbg)printf(".\tshift2 s%d <- %d %d %d\n", yyval, p1, p2, p3);
  46:     effps = EFFPS(ps+deltaps);
  47:     h1 = eht[p1]; b1 = ebase[p1];
  48:     h2 = eht[p2]; b2 = ebase[p2];
  49:     h3 = eht[p3]; b3 = ebase[p3];
  50:     d1 = VERT(1);
  51:     subsh = -d1+h2-b2;
  52:     if( d1+b1 > h2 ) /* move little sub down */
  53:         subsh = b1-b2;
  54:     supsh = - VERT(1) - b3;
  55:     d2 = VERT(1);
  56:     if( VERT(1)+h3 < h1-b1 )
  57:         supsh = -(h1-b1) + (h3-b3) - d2;
  58:     eht[yyval] = h1 + max(0, h3-VERT(1)) + max(0, h2-b1-d1);
  59:     ebase[yyval] = b1+max(0, h2-b1-d1);
  60:     nrwid(p2, effps, p2);
  61:     nrwid(p3, effps, p3);
  62:     printf(".nr %d \\n(%d\n", treg, p3);
  63:     printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, treg, treg, p2);
  64:     printf(".as %d \\v'%du'\\*(%d\\h'-\\n(%du'\\v'%du'\\\n",
  65:         p1, subsh, p2, p2, -subsh+supsh);
  66:     printf("\\*(%d\\h'-\\n(%du+\\n(%du'\\v'%du'\n",
  67:         p3, p3, treg, -supsh);
  68:     ps += deltaps;
  69:     ofree(p2); ofree(p3); ofree(treg);
  70: }

Defined functions