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- /* xlisp.c - a small implementation of lisp with object-oriented programming */
- /* Copyright (c) 1989, by David Michael Betz. */
- /* You may give out copies of this software; for conditions see the file */
- /* COPYING included with this distribution. */
-
- #include <stdlib.h>
- #include "xlisp.h"
- #include "osdef.h"
- #ifdef ANSI
- #include "xlproto.h"
- #include "osproto.h"
- void main(int,unsigned char *[]);
- #else
- #include "xlfun.h"
- #include "osfun.h"
- #endif ANSI
- #ifdef AMIGA
- #include "autil1.h"
- extern char deftool[];
- #endif AMIGA
- #include "xlvar.h"
-
- /* define the banner line string */
- #define BANNER "XLISP version 2.1, Copyright (c) 1989, by David Betz"
-
- /* global variables */
- jmp_buf top_level;
- char *progname; /* used for reading the symbol table - L. Tierney */
-
- /* main - the main routine */
- void main(argc,argv)
- int argc; unsigned char *argv[];
- {
- char *transcript;
- CONTEXT cntxt;
- int verbose,i;
- LVAL expr;
- #ifdef AMIGA
- char project[30],defdir[50];
- #endif AMIGA
-
- /* setup default argument values */
- transcript = NULL;
- verbose = FALSE;
-
- /* parse the argument list switches */
- #ifndef MACINTOSH
- #ifdef AMIGA
- FindStart(&argc,argv,deftool,project,defdir);
- #endif AMIGA
- progname = argv[0]; /* L. Tierney */
- for (i = 1; i < argc; ++i)
- if (argv[i][0] == '-')
- switch(argv[i][1]) {
- case 't':
- case 'T':
- transcript = &argv[i][2];
- break;
- case 'v':
- case 'V':
- verbose = TRUE;
- break;
- }
- #endif /* MACINTOSH */
-
- /* initialize and print the banner line */
- osinit(BANNER);
-
- /* setup initialization error handler */
- xlbegin(&cntxt,CF_TOPLEVEL|CF_CLEANUP|CF_BRKLEVEL,(LVAL)1);
- if (setjmp(cntxt.c_jmpbuf))
- xlfatal("fatal initialization error");
- if (setjmp(top_level))
- xlfatal("RESTORE not allowed during initialization");
-
- /* initialize xlisp */
- xlinit();
- xlend(&cntxt);
-
- /* reset the error handler */
- xlbegin(&cntxt,CF_TOPLEVEL|CF_CLEANUP|CF_BRKLEVEL,true);
-
- /* open the transcript file */
- if (transcript && (tfp = osaopen(transcript,"w")) == NULL) {
- sprintf(buf,"error: can't open transcript file: %s",transcript);
- stdputstr(buf);
- }
-
- /* load "init.lsp" */
- if (setjmp(cntxt.c_jmpbuf) == 0)
- xlload("init.lsp",TRUE,FALSE);
-
- /* load any files mentioned on the command line */
- if (setjmp(cntxt.c_jmpbuf) == 0)
- for (i = 1; i < argc; i++)
- if (argv[i][0] != '-' && !xlload(argv[i],TRUE,verbose))
- xlerror("can't load file",cvstring(argv[i]));
-
- /* target for restore */
- if (setjmp(top_level))
- xlbegin(&cntxt,CF_TOPLEVEL|CF_CLEANUP|CF_BRKLEVEL,true);
-
- /* protect some pointers */
- xlsave1(expr);
-
- /* main command processing loop */
- for (;;) {
-
- /* setup the error return */
- if (setjmp(cntxt.c_jmpbuf)) {
- setvalue(s_evalhook,NIL);
- setvalue(s_applyhook,NIL);
- xltrcindent = 0;
- xldebug = 0;
- osreset(); /* L. Tierney */
- xlflush();
- }
-
- /* print a prompt */
- stdputstr("> ");
-
- /* read an expression */
- if (!xlread(getvalue(s_stdin),&expr,FALSE))
- break;
-
- /* process carriage return (to clean up dribble) - L. Tierney */
- if (xlpeek(getvalue(s_stdin)) == '\n')
- xlgetc(getvalue(s_stdin));
-
- /* save the input expression */
- xlrdsave(expr);
-
- /* evaluate the expression */
- expr = xleval(expr);
-
- /* save the result */
- xlevsave(expr);
-
- /* print it */
- stdprint(expr);
- }
- xlend(&cntxt);
-
- /* clean up */
- wrapup();
- }
-
- /* xlrdsave - save the last expression returned by the reader */
- void xlrdsave(expr)
- 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(expr)
- LVAL expr;
- {
- setvalue(s_3star,getvalue(s_2star));
- setvalue(s_2star,getvalue(s_1star));
- setvalue(s_1star,expr);
- }
-
- /* xlfatal - print a fatal error message and exit */
- void xlfatal(msg)
- char *msg;
- {
- oserror(msg);
- wrapup();
- }
-
- /* wrapup - clean up and exit to the operating system */
- void wrapup()
- {
- if (tfp)
- osclose(tfp);
- osfinish();
- exit(0);
- }
-