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author | Torne Wuff <torne@wolfpuppy.org.uk> | 2010-01-17 22:15:13 +0000 |
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committer | Torne Wuff <torne@wolfpuppy.org.uk> | 2010-01-17 22:15:13 +0000 |
commit | 7f28c94eda576e3f972fc05468188986f2e45885 (patch) | |
tree | e03b94613028d16855a5d3df0f4853e077931214 /apps/plugins/frotz/table.c | |
parent | 563f2602f471208cb8544a36539a79dcceaad643 (diff) | |
download | rockbox-7f28c94eda576e3f972fc05468188986f2e45885.tar.gz rockbox-7f28c94eda576e3f972fc05468188986f2e45885.zip |
New plugin: frotz, a Z-machine interpreter, for playing interactive fiction.
The interpreter more or less passes all the tests in the z-machine test suite.
It should build for every target except Archos (for which it is disabled).
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24267 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/plugins/frotz/table.c')
-rw-r--r-- | apps/plugins/frotz/table.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/apps/plugins/frotz/table.c b/apps/plugins/frotz/table.c new file mode 100644 index 0000000000..eb3a16366d --- /dev/null +++ b/apps/plugins/frotz/table.c | |||
@@ -0,0 +1,193 @@ | |||
1 | /* table.c - Table handling opcodes | ||
2 | * Copyright (c) 1995-1997 Stefan Jokisch | ||
3 | * | ||
4 | * This file is part of Frotz. | ||
5 | * | ||
6 | * Frotz is free software; you can redistribute it and/or modify | ||
7 | * it under the terms of the GNU General Public License as published by | ||
8 | * the Free Software Foundation; either version 2 of the License, or | ||
9 | * (at your option) any later version. | ||
10 | * | ||
11 | * Frotz is distributed in the hope that it will be useful, | ||
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
14 | * GNU General Public License for more details. | ||
15 | * | ||
16 | * You should have received a copy of the GNU General Public License | ||
17 | * along with this program; if not, write to the Free Software | ||
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA | ||
19 | */ | ||
20 | |||
21 | #include "frotz.h" | ||
22 | |||
23 | /* | ||
24 | * z_copy_table, copy a table or fill it with zeroes. | ||
25 | * | ||
26 | * zargs[0] = address of table | ||
27 | * zargs[1] = destination address or 0 for fill | ||
28 | * zargs[2] = size of table | ||
29 | * | ||
30 | * Note: Copying is safe even when source and destination overlap; but | ||
31 | * if zargs[1] is negative the table _must_ be copied forwards. | ||
32 | * | ||
33 | */ | ||
34 | |||
35 | void z_copy_table (void) | ||
36 | { | ||
37 | zword addr; | ||
38 | zword size = zargs[2]; | ||
39 | zbyte value; | ||
40 | int i; | ||
41 | |||
42 | if (zargs[1] == 0) /* zero table */ | ||
43 | |||
44 | for (i = 0; i < size; i++) | ||
45 | storeb ((zword) (zargs[0] + i), 0); | ||
46 | |||
47 | else if ((short) size < 0 || zargs[0] > zargs[1]) /* copy forwards */ | ||
48 | |||
49 | for (i = 0; i < (((short) size < 0) ? - (short) size : size); i++) { | ||
50 | addr = zargs[0] + i; | ||
51 | LOW_BYTE (addr, value) | ||
52 | storeb ((zword) (zargs[1] + i), value); | ||
53 | } | ||
54 | |||
55 | else /* copy backwards */ | ||
56 | |||
57 | for (i = size - 1; i >= 0; i--) { | ||
58 | addr = zargs[0] + i; | ||
59 | LOW_BYTE (addr, value) | ||
60 | storeb ((zword) (zargs[1] + i), value); | ||
61 | } | ||
62 | |||
63 | }/* z_copy_table */ | ||
64 | |||
65 | /* | ||
66 | * z_loadb, store a value from a table of bytes. | ||
67 | * | ||
68 | * zargs[0] = address of table | ||
69 | * zargs[1] = index of table entry to store | ||
70 | * | ||
71 | */ | ||
72 | |||
73 | void z_loadb (void) | ||
74 | { | ||
75 | zword addr = zargs[0] + zargs[1]; | ||
76 | zbyte value; | ||
77 | |||
78 | LOW_BYTE (addr, value) | ||
79 | |||
80 | store (value); | ||
81 | |||
82 | }/* z_loadb */ | ||
83 | |||
84 | /* | ||
85 | * z_loadw, store a value from a table of words. | ||
86 | * | ||
87 | * zargs[0] = address of table | ||
88 | * zargs[1] = index of table entry to store | ||
89 | * | ||
90 | */ | ||
91 | |||
92 | void z_loadw (void) | ||
93 | { | ||
94 | zword addr = zargs[0] + 2 * zargs[1]; | ||
95 | zword value; | ||
96 | |||
97 | LOW_WORD (addr, value) | ||
98 | |||
99 | store (value); | ||
100 | |||
101 | }/* z_loadw */ | ||
102 | |||
103 | /* | ||
104 | * z_scan_table, find and store the address of a target within a table. | ||
105 | * | ||
106 | * zargs[0] = target value to be searched for | ||
107 | * zargs[1] = address of table | ||
108 | * zargs[2] = number of table entries to check value against | ||
109 | * zargs[3] = type of table (optional, defaults to 0x82) | ||
110 | * | ||
111 | * Note: The table is a word array if bit 7 of zargs[3] is set; otherwise | ||
112 | * it's a byte array. The lower bits hold the address step. | ||
113 | * | ||
114 | */ | ||
115 | |||
116 | void z_scan_table (void) | ||
117 | { | ||
118 | zword addr = zargs[1]; | ||
119 | int i; | ||
120 | |||
121 | /* Supply default arguments */ | ||
122 | |||
123 | if (zargc < 4) | ||
124 | zargs[3] = 0x82; | ||
125 | |||
126 | /* Scan byte or word array */ | ||
127 | |||
128 | for (i = 0; i < zargs[2]; i++) { | ||
129 | |||
130 | if (zargs[3] & 0x80) { /* scan word array */ | ||
131 | |||
132 | zword wvalue; | ||
133 | |||
134 | LOW_WORD (addr, wvalue) | ||
135 | |||
136 | if (wvalue == zargs[0]) | ||
137 | goto finished; | ||
138 | |||
139 | } else { /* scan byte array */ | ||
140 | |||
141 | zbyte bvalue; | ||
142 | |||
143 | LOW_BYTE (addr, bvalue) | ||
144 | |||
145 | if (bvalue == zargs[0]) | ||
146 | goto finished; | ||
147 | |||
148 | } | ||
149 | |||
150 | addr += zargs[3] & 0x7f; | ||
151 | |||
152 | } | ||
153 | |||
154 | addr = 0; | ||
155 | |||
156 | finished: | ||
157 | |||
158 | store (addr); | ||
159 | branch (addr); | ||
160 | |||
161 | }/* z_scan_table */ | ||
162 | |||
163 | /* | ||
164 | * z_storeb, write a byte into a table of bytes. | ||
165 | * | ||
166 | * zargs[0] = address of table | ||
167 | * zargs[1] = index of table entry | ||
168 | * zargs[2] = value to be written | ||
169 | * | ||
170 | */ | ||
171 | |||
172 | void z_storeb (void) | ||
173 | { | ||
174 | |||
175 | storeb ((zword) (zargs[0] + zargs[1]), zargs[2]); | ||
176 | |||
177 | }/* z_storeb */ | ||
178 | |||
179 | /* | ||
180 | * z_storew, write a word into a table of words. | ||
181 | * | ||
182 | * zargs[0] = address of table | ||
183 | * zargs[1] = index of table entry | ||
184 | * zargs[2] = value to be written | ||
185 | * | ||
186 | */ | ||
187 | |||
188 | void z_storew (void) | ||
189 | { | ||
190 | |||
191 | storew ((zword) (zargs[0] + 2 * zargs[1]), zargs[2]); | ||
192 | |||
193 | }/* z_storew */ | ||