static List *callsettor(char *name, List *defn) {
Push p;
List *settor;
if (specialvar(name) || (settor = varlookup2("set-", name, NULL)) == NULL)
return defn;
Ref(List *, lp, defn);
Ref(List *, fn, settor);
varpush(&p, "0", mklist(mkstr(name), NULL));
lp = listcopy(eval(append(fn, lp), NULL, 0));
varpop(&p);
RefEnd(fn);
RefReturn(lp);
}
/* localbind -- recursively convert a Bindings list into dynamic binding */
static List *localbind(Binding *dynamic0, Binding *lexical0,
Tree *body0, int evalflags) {
if (dynamic0 == NULL)
return walk(body0, lexical0, evalflags);
else {
Push p;
Ref(List *, result, NULL);
Ref(Tree *, body, body0);
Ref(Binding *, dynamic, dynamic0);
Ref(Binding *, lexical, lexical0);
varpush(&p, dynamic->name, dynamic->defn);
result = localbind(dynamic->next, lexical, body, evalflags);
varpop(&p);
RefEnd3(lexical, dynamic, body);
RefReturn(result);
}
}
save() {
reg char *sp;
reg int outf;
reg time_t *tp;
char buf[80];
time_t tme;
STAT junk;
tp = &tme;
if (Fromfile && getyn(SAMEFILEPROMPT))
strcpy(buf, Fromfile);
else {
over:
prompt(FILEPROMPT);
leaveok(Board, FALSE);
refresh();
sp = buf;
while ((*sp = readch()) != '\n') {
if (*sp == killchar())
goto over;
else if (*sp == erasechar()) {
if (--sp < buf)
sp = buf;
else {
addch('\b');
/*
* if the previous char was a control
* char, cover up two characters.
*/
if (*sp < ' ')
addch('\b');
clrtoeol();
}
}
else
addstr(unctrl(*sp++));
refresh();
}
*sp = '\0';
leaveok(Board, TRUE);
}
/*
* check for existing files, and confirm overwrite if needed
*/
if (sp == buf || (!Fromfile && stat(buf, &junk) > -1
&& getyn(OVERWRITEFILEPROMPT) == FALSE))
return FALSE;
if ((outf = creat(buf, 0644)) < 0) {
error(strerror(errno));
return FALSE;
}
mvwaddstr(Score, ERR_Y, ERR_X, buf);
wrefresh(Score);
time(tp); /* get current time */
strcpy(buf, ctime(tp));
for (sp = buf; *sp != '\n'; sp++)
continue;
*sp = '\0';
varpush(outf, write);
close(outf);
wprintw(Score, " [%s]", buf);
wclrtoeol(Score);
wrefresh(Score);
return TRUE;
}
save() {
reg char *sp;
reg int outf;
reg TIME *tp;
char buf[80];
TIME tme;
STAT junk;
tp = &tme;
if (Fromfile && getyn("Same file? "))
strcpy(buf, Fromfile);
else {
over:
mvaddstr(MOVE_Y, MOVE_X, "file: ");
clrtoeol();
leaveok(Board, FALSE);
refresh();
sp = buf;
while ((*sp = readch()) != '\n') {
if (*sp == _tty.sg_kill)
goto over;
else if (*sp == _tty.sg_erase) {
if (--sp < buf)
sp = buf;
else {
addch('\b');
/*
* if the previous char was a control
* char, cover up two characters.
*/
if (*sp < ' ')
addch('\b');
clrtoeol();
}
}
else
addstr(unctrl(*sp++));
refresh();
}
*sp = '\0';
leaveok(Board, TRUE);
}
/*
* check for existing files, and confirm overwrite if needed
*/
if (sp == buf || (!Fromfile && stat(buf, &junk) > -1
&& getyn("Overwrite File? ") == FALSE))
return FALSE;
if ((outf = creat(buf, 0644)) < 0) {
error(sys_errlist[errno]);
return FALSE;
}
mvwaddstr(Score, ERR_Y, ERR_X, buf);
wrefresh(Score);
time(tp); /* get current time */
strcpy(buf, ctime(tp));
for (sp = buf; *sp != '\n'; sp++)
continue;
*sp = '\0';
varpush(outf, write);
close(outf);
wprintw(Score, " [%s]", buf);
wclrtoeol(Score);
wrefresh(Score);
return TRUE;
}
/* eval -- evaluate a list, producing a list */
extern List *eval(List *list0, Binding *binding0, int flags) {
Closure *volatile cp;
List *fn;
if (++evaldepth >= maxevaldepth)
fail("es:eval", "max-eval-depth exceeded");
Ref(List *, list, list0);
Ref(Binding *, binding, binding0);
Ref(char *, funcname, NULL);
restart:
if (list == NULL) {
RefPop3(funcname, binding, list);
--evaldepth;
return true;
}
assert(list->term != NULL);
if ((cp = getclosure(list->term)) != NULL) {
switch (cp->tree->kind) {
case nPrim:
assert(cp->binding == NULL);
list = prim(cp->tree->u[0].s, list->next, binding, flags);
break;
case nThunk:
list = walk(cp->tree->u[0].p, cp->binding, flags);
break;
case nLambda:
ExceptionHandler
Push p;
Ref(Tree *, tree, cp->tree);
Ref(Binding *, context,
bindargs(tree->u[0].p,
list->next,
cp->binding));
if (funcname != NULL)
varpush(&p, "0",
mklist(mkterm(funcname,
NULL),
NULL));
list = walk(tree->u[1].p, context, flags);
if (funcname != NULL)
varpop(&p);
RefEnd2(context, tree);
CatchException (e)
if (termeq(e->term, "return")) {
list = e->next;
goto done;
}
throw(e);
EndExceptionHandler
break;
case nList: {
list = glom(cp->tree, cp->binding, TRUE);
list = append(list, list->next);
goto restart;
}
default:
panic("eval: bad closure node kind %d",
cp->tree->kind);
}
goto done;
}
/* the logic here is duplicated in $&whatis */
Ref(char *, name, getstr(list->term));
fn = varlookup2("fn-", name, binding);
if (fn != NULL) {
funcname = name;
list = append(fn, list->next);
RefPop(name);
goto restart;
}
if (isabsolute(name)) {
char *error = checkexecutable(name);
if (error != NULL)
fail("$&whatis", "%s: %s", name, error);
list = forkexec(name, list, flags & eval_inchild);
RefPop(name);
goto done;
}
RefEnd(name);
fn = pathsearch(list->term);
if (fn != NULL && fn->next == NULL
&& (cp = getclosure(fn->term)) == NULL) {
char *name = getstr(fn->term);
list = forkexec(name, list, flags & eval_inchild);
goto done;
}
list = append(fn, list->next);
goto restart;
done:
--evaldepth;
if ((flags & eval_exitonfalse) && !istrue(list))
exit(exitstatus(list));
RefEnd2(funcname, binding);
RefReturn(list);
}