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/**** 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 3.02, 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; }
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