1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/**** need to handle free image appropriately */
/**** should include toplevel loop */
/**** should not print banner, at least optionally */
/**** think through error handling, system reset */
/* XLSERV.C -- Xlisp server replacement for XLISP.C */
/* Written by Tom Almy */
#include "xlisp.h"
/* define the banner line string */
#define BANNER "XLISP-PLUS version 3.04, Copyright (c) 1988, by David Betz\n\
As modified by Thomas Almy"
jmp_buf sysFailure;
#ifdef SAVERESTORE
jmp_buf top_level;
VOID freeimage _((void));
#endif
LVAL getstroutput _((LVAL stream));
int execXlisp P4H(char *, int, char **, LVAL *);
/* The Xlisp server must be initialized via a call to initXlisp.
Since it could be restoring from a workspace, the name of that workspace
is passed as an argument */
/* The initialization function returns non-zero on initialization failure:
1 - failure during initialization
2 - failure reading init.lsp
3 - OS Failure (typically not enough memory)
*/
int initXlisp P1C(char *, resfile)
{
CONTEXT cntxt;
int i;
/* Operating system initialization code will probably need changing
from the original, non-server version */
osinit(BANNER);
/* setup initialization error handler with phoney, non NIL "true" */
xlbegin(&cntxt,CF_TOPLEVEL|CF_CLEANUP|CF_BRKLEVEL,(LVAL)1);
if (setjmp(cntxt.c_jmpbuf)) return (1);
if (setjmp(sysFailure)) return (3);
/* initialize xlisp */
#ifdef SAVERESTORE
i = xlinit(resfile);
#else
i = xlinit(NULL);
#endif
xlend(&cntxt);
if (i) { /* need to load init.lsp */
xlbegin(&cntxt, CF_TOPLEVEL|CF_CLEANUP|CF_BRKLEVEL, s_true);
if (setjmp(cntxt.c_jmpbuf) != 0) {
xlend(&cntxt);
return (2);
}
else
xlload("init.lsp",TRUE,FALSE);
xlend(&cntxt);
}
return 0;
}
/* execXlisp -- execute an Xlisp expression */
/* Return code: 1 "error failure" 2 "total failure" 3 "restore happened" */
int execXlisp P4C(char *, str, /* string to execute */
int, restype, /* Nonzero for string return,
else value return */
char **, resstr, /* result string will be disposed on next
execXlisp call*/
LVAL *, resval) /* pointer to result LVAL,
disposed on next call */
{
CONTEXT cntxt;
LVAL expr, instream;
unsigned i, len;
xlbegin(&cntxt, CF_TOPLEVEL|CF_CLEANUP|CF_BRKLEVEL, s_true);
if (setjmp(sysFailure)) {
xlend(&cntxt);
xlpopn(2);
return 2;
}
if (setjmp(top_level)) {
xlend(&cntxt);
xlpopn(2);
return 3;
}
/* setup the error return */
if (setjmp(cntxt.c_jmpbuf)) {
xlend(&cntxt);
setvalue(s_evalhook,NIL);
setvalue(s_applyhook,NIL);
xltrcindent = 0;
xldebug = 0;
xlpopn(2);
return 1;
}
/* protect some pointers */
xlstkcheck(2);
xlprotect(instream);
xlsave1(expr);
/* create input stream from input */
instream = newustream();
len = strlen(str);
for (i=0; i < len; i++) xlputc(instream, str[i]);
/* main processing loop */
for (;;) {
if (!xlread(instream, &expr, FALSE, FALSE)) break;
xlrdsave(expr);
expr = xleval(expr);
xlevsave(expr);
/* NO PRINTING! */
}
if (restype) {
expr = getstroutput(expr);
*resstr = getstring(expr);
}
else *resval = expr; /* return expression */
xlend(&cntxt);
xlpopn(2);
return (0);
}
/* wrapupXlisp - clean up -- we are done */
VOID wrapupXlisp(V)
{
if (tfp != CLOSED)
OSCLOSE(tfp);
#ifdef SAVERESTORE /* should really be defined for this */
freeimage();
#endif
osfinish();
}
/* xlfatal - print a fatal error message and exit */
VOID xlfatal P1C(char *, msg)
{
xoserror(msg);
wrapupXlisp();
longjmp(sysFailure,1);
}
/* Terminate execution */
VOID wrapup(V)
{
wrapupXlisp();
longjmp(sysFailure,1);
}
/* xlrdsave - save the last expression returned by the reader */
VOID xlrdsave P1C(LVAL, expr)
{
setvalue(s_3plus,getvalue(s_2plus));
setvalue(s_2plus,getvalue(s_1plus));
setvalue(s_1plus,getvalue(s_minus));
setvalue(s_minus,expr);
}
/* xlevsave - save the last expression returned by the evaluator */
VOID xlevsave P1C(LVAL, expr)
{
setvalue(s_3star,getvalue(s_2star));
setvalue(s_2star,getvalue(s_1star));
setvalue(s_1star,expr);
}
VOID main(V)
{
char *foo, ch;
int i;
if (initXlisp("win.wks")!= 0) {
fprintf(stderr, "Init failure");
return;
}
fprintf(stderr,"Hello there!\n");
if ((i = execXlisp("(room)", 1, &foo, NULL)) != 0)
fprintf(stderr, "Exec failure #%d", i);
else
while ((ch = *foo++) != 0) putchar(ch);
wrapupXlisp();
fprintf(stderr,"Finished!\n");
return;
}
VOID freeimage(V) {}
LVAL xresetsystem() { return NIL; }
LVAL xtoplevelloop() { return NIL; }
|
