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Annotation of 42BSD/usr.bin/eqn/fromto.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)fromto.c   4.3 8/11/83";
        !             3: #endif
        !             4: 
        !             5: # include "e.h"
        !             6: 
        !             7: fromto(p1, p2, p3) int p1, p2, p3; {
        !             8:        int b, h1, b1, pss;
        !             9:        yyval = oalloc();
        !            10:        lfont[yyval] = rfont[yyval] = 0;
        !            11:        h1 = eht[yyval] = eht[p1];
        !            12:        b1 = ebase[p1];
        !            13:        b = 0;
        !            14:        pss = EFFPS(ps);
        !            15:        ps += 3;
        !            16:        nrwid(p1, ps, p1);
        !            17:        printf(".nr %d \\n(%d\n", yyval, p1);
        !            18:        if( p2>0 ) {
        !            19:                nrwid(p2, pss, p2);
        !            20:                printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, yyval, yyval, p2);
        !            21:                eht[yyval] += eht[p2];
        !            22:                b = eht[p2];
        !            23:        }
        !            24:        if( p3>0 ) {
        !            25:                nrwid(p3, pss, p3);
        !            26:                printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p3, yyval, yyval, p3);
        !            27:                eht[yyval] += eht[p3];
        !            28:        }
        !            29:        printf(".ds %d ", yyval);       /* bottom of middle box */
        !            30:        if( p2>0 ) {
        !            31:                printf("\\v'%du'\\h'\\n(%du-\\n(%du/2u'\\s%d\\*(%d\\s%d", 
        !            32:                        eht[p2]-ebase[p2]+b1, yyval, p2, pss, p2, EFFPS(ps));
        !            33:                printf("\\h'-\\n(%du-\\n(%du/2u'\\v'%du'\\\n", 
        !            34:                        yyval, p2, -(eht[p2]-ebase[p2]+b1));
        !            35:        }
        !            36: #ifndef NEQN
        !            37:        printf("\\h'\\n(%du-\\n(%du/2u'\\*(%d\\h'\\n(%du-\\n(%du/2u'\\\n", 
        !            38: #else NEQN
        !            39:        printf("\\h'\\n(%du-\\n(%du/2u'\\*(%d\\h'\\n(%du-\\n(%du+2u/2u'\\\n", 
        !            40: #endif NEQN
        !            41:                yyval, p1, p1, yyval, p1);
        !            42:        if( p3>0 ) {
        !            43:                printf("\\v'%du'\\h'-\\n(%du-\\n(%du/2u'\\s%d\\*(%d\\s%d\\h'\\n(%du-\\n(%du/2u'\\v'%du'\\\n", 
        !            44:                        -(h1-b1+ebase[p3]), yyval, p3, pss, p3, EFFPS(ps), yyval, p3, (h1-b1+ebase[p3]));
        !            45:        }
        !            46:        printf("\n");
        !            47:        ebase[yyval] = b + b1;
        !            48:        if(dbg)printf(".\tfrom to: S%d <- %d f %d t %d; h=%d b=%d\n", 
        !            49:                yyval, p1, p2, p3, eht[yyval], ebase[yyval]);
        !            50:        ofree(p1);
        !            51:        if( p2>0 ) ofree(p2);
        !            52:        if( p3>0 ) ofree(p3);
        !            53: }

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