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 #include "e.h"
16 #include "e.def"
17
18 void
bshiftb(int p1,int dir,int p2)19 bshiftb(int p1, int dir, int p2)
20 {
21 int shval, d1, h1, b1, h2, b2;
22 #ifndef NEQN
23 int diffps, effps, effps2;
24 char *sh1, *sh2;
25 #endif /* NEQN */
26
27 yyval = p1;
28 h1 = eht[p1];
29 b1 = ebase[p1];
30 h2 = eht[p2];
31 b2 = ebase[p2];
32 #ifndef NEQN
33 effps = EFFPS(ps);
34 effps2 = EFFPS(ps+deltaps);
35 diffps = deltaps;
36 sh1 = sh2 = "";
37 #endif /* NEQN */
38 if (dir == SUB) { /* subscript */
39 #ifndef NEQN
40 /* top 1/2m above bottom of main box */
41 d1 = VERT(EM(0.5, effps2));
42 #else /* NEQN */
43 d1 = VERT(1);
44 #endif /* NEQN */
45 shval = - d1 + h2 - b2;
46 if (d1+b1 > h2) /* move little sub down */
47 shval = b1-b2;
48 ebase[yyval] = b1 + max(0, h2-b1-d1);
49 eht[yyval] = h1 + max(0, h2-b1-d1);
50 #ifndef NEQN
51 if (rfont[p1] == ITAL && lfont[p2] == ROM)
52 sh1 = "\\|";
53 if (rfont[p2] == ITAL)
54 sh2 = "\\|";
55 #endif /* NEQN */
56 } else { /* superscript */
57 #ifndef NEQN
58 /* 4/10 up main box */
59 d1 = VERT(EM(0.2, effps));
60 #else /* NEQN */
61 d1 = VERT(1);
62 #endif /* NEQN */
63 ebase[yyval] = b1;
64 #ifndef NEQN
65 shval = -VERT((4 * (h1-b1)) / 10) - b2;
66 if (VERT(4*(h1-b1)/10) + h2 < h1-b1) /* raise little super */
67 #else /* NEQN */
68 shval = -VERT(1) - b2;
69 if (VERT(1) + h2 < h1-b1) /* raise little super */
70 #endif /* NEQN */
71 shval = -(h1-b1) + h2-b2 - d1;
72 #ifndef NEQN
73 eht[yyval] = h1 + max(0, h2-VERT((6*(h1-b1))/10));
74 if (rfont[p1] == ITAL)
75 sh1 = "\\|";
76 if (rfont[p2] == ITAL)
77 sh2 = "\\|";
78 #else /* NEQN */
79 eht[yyval] = h1 + max(0, h2 - VERT(1));
80 #endif /* NEQN */
81 }
82 if (dbg)
83 printf(".\tb:b shift b: S%d <- S%d vert %d S%d vert %d; "
84 "b=%d, h=%d\n", yyval, p1, shval, p2, -shval,
85 ebase[yyval], eht[yyval]);
86 #ifndef NEQN
87 printf(".as %d \\v'%du'\\s-%d%s\\*(%d\\s+%d%s\\v'%du'\n",
88 yyval, shval, diffps, sh1, p2, diffps, sh2, -shval);
89 ps += deltaps;
90 if (rfont[p2] == ITAL)
91 rfont[p1] = 0;
92 else
93 rfont[p1] = rfont[p2];
94 #else /* NEQN */
95 printf(".as %d \\v'%du'\\*(%d\\v'%du'\n",
96 yyval, shval, p2, -shval);
97 #endif /* NEQN */
98 ofree(p2);
99 }
100
101 void
shift(int p1)102 shift(int p1)
103 {
104 ps -= deltaps;
105 yyval = p1;
106 if (dbg) printf(".\tshift: %d;ps=%d\n", yyval, ps);
107 }
108
109 void
shift2(int p1,int p2,int p3)110 shift2(int p1, int p2, int p3)
111 {
112 int effps, h1, h2, h3, b1, b2, b3, subsh, d1, d2, supsh, treg;
113 #ifndef NEQN
114 int effps2;
115 #endif /* NEQN */
116
117 treg = oalloc();
118 yyval = p1;
119 if (dbg) printf(".\tshift2 s%d <- %d %d %d\n", yyval, p1, p2, p3);
120 effps = EFFPS(ps+deltaps);
121 #ifndef NEQN
122 eht[p3] = h3 = VERT((eht[p3] * effps) / EFFPS(ps));
123 ps += deltaps;
124 effps2 = EFFPS(ps+deltaps);
125 #endif /* NEQN */
126 h1 = eht[p1]; b1 = ebase[p1];
127 h2 = eht[p2]; b2 = ebase[p2];
128 #ifndef NEQN
129 b3 = ebase[p3];
130 d1 = VERT(EM(0.5, effps2));
131 #else /* NEQN */
132 h3 = eht[p3]; b3 = ebase[p3];
133 d1 = VERT(1);
134 #endif /* NEQN */
135 subsh = -d1+h2-b2;
136 if (d1+b1 > h2) /* move little sub down */
137 subsh = b1-b2;
138 #ifndef NEQN
139 supsh = -VERT((4*(h1-b1))/10) - b3;
140 d2 = VERT(EM(0.2, effps));
141 if (VERT(4*(h1-b1)/10)+h3 < h1-b1)
142 #else /* NEQN */
143 supsh = - VERT(1) - b3;
144 d2 = VERT(1);
145 if (VERT(1)+h3 < h1-b1)
146 #endif /* NEQN */
147 supsh = -(h1-b1) + (h3-b3) - d2;
148 #ifndef NEQN
149 eht[yyval] = h1 + max(0, h3-VERT((6*(h1-b1))/10)) + max(0, h2-b1-d1);
150 #else /* NEQN */
151 eht[yyval] = h1 + max(0, h3-VERT(1)) + max(0, h2-b1-d1);
152 #endif /* NEQN */
153 ebase[yyval] = b1+max(0, h2-b1-d1);
154 #ifndef NEQN
155 if (rfont[p1] == ITAL && lfont[p2] == ROM)
156 printf(".ds %d \\|\\*(%d\n", p2, p2);
157 if (rfont[p2] == ITAL)
158 printf(".as %d \\|\n", p2);
159 #endif /* NEQN */
160 nrwid(p2, effps, p2);
161 #ifndef NEQN
162 if (rfont[p1] == ITAL && lfont[p3] == ROM)
163 printf(".ds %d \\|\\|\\*(%d\n", p3, p3);
164 else
165 printf(".ds %d \\|\\*(%d\n", p3, p3);
166 #endif /* NEQN */
167 nrwid(p3, effps, p3);
168 printf(".nr %d \\n(%d\n", treg, p3);
169 printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, treg, treg, p2);
170 #ifndef NEQN
171 printf(".as %d \\v'%du'\\s%d\\*(%d\\h'-\\n(%du'\\v'%du'\\\n",
172 p1, subsh, effps, p2, p2, -subsh+supsh);
173 printf("\\s%d\\*(%d\\h'-\\n(%du+\\n(%du'\\s%d\\v'%du'\n",
174 effps, p3, p3, treg, effps2, -supsh);
175 #else /* NEQN */
176 printf(".as %d \\v'%du'\\*(%d\\h'-\\n(%du'\\v'%du'\\\n",
177 p1, subsh, p2, p2, -subsh+supsh);
178 printf("\\*(%d\\h'-\\n(%du+\\n(%du'\\v'%du'\n",
179 p3, p3, treg, -supsh);
180 #endif /* NEQN */
181 ps += deltaps;
182 #ifndef NEQN
183 if (rfont[p2] == ITAL)
184 rfont[yyval] = 0; /* lie */
185 #endif /* NEQN */
186 ofree(p2); ofree(p3); ofree(treg);
187 }
188