/* listify -- turn an argc/argv vector into a list */
extern List *listify(int argc, char **argv) {
Ref(List *, list, NULL);
while (argc > 0) {
Term *term = mkterm(argv[--argc], NULL);
list = mklist(term, list);
}
RefReturn(list);
}
extern List *endsplit(void) {
List *result;
if (buffer != NULL) {
Term *term = mkterm(sealcountedbuffer(buffer), NULL);
value = mklist(term, value);
buffer = NULL;
}
result = reverse(value);
value = NULL;
return result;
}
extern int esopt(const char *options) {
int c;
const char *arg, *opt;
assert(usage != NULL);
assert(termarg == NULL);
if (nextchar == 0) {
if (args == NULL)
return EOF;
assert(args->term != NULL);
arg = getstr(args->term);
if (*arg != '-')
return EOF;
if (arg[1] == '-' && arg[2] == '\0') {
args = args->next;
return EOF;
}
nextchar = 1;
} else {
assert(args != NULL && args->term != NULL);
arg = getstr(args->term);
}
c = arg[nextchar++];
opt = strchr(options, c);
if (opt == NULL) {
const char *msg = usage;
usage = NULL;
args = NULL;
nextchar = 0;
fail(invoker, "illegal option: -%c -- usage: %s", c, msg);
}
if (arg[nextchar] == '\0') {
nextchar = 0;
args = args->next;
}
if (opt[1] == ':') {
if (args == NULL) {
const char *msg = usage;
fail(invoker, "option -%c expects an argument -- usage: %s", c, msg);
}
termarg = (nextchar == 0)
? args->term
: mkterm(gcdup(arg + nextchar), NULL);
nextchar = 0;
args = args->next;
}
return c;
}
extern void splitstring(char *in, size_t len, Boolean endword) {
Buffer *buf = buffer;
unsigned char *s = (unsigned char *) in, *inend = s + len;
if (splitchars) {
assert(buf == NULL);
while (s < inend) {
Term *term = mkterm(gcndup((char *) s++, 1), NULL);
value = mklist(term, value);
}
return;
}
if (!coalesce && buf == NULL)
buf = openbuffer(0);
while (s < inend) {
int c = *s++;
if (buf != NULL)
if (isifs[c]) {
Term *term = mkterm(sealcountedbuffer(buf), NULL);
value = mklist(term, value);
buf = coalesce ? NULL : openbuffer(0);
} else
buf = bufputc(buf, c);
else if (!isifs[c])
buf = bufputc(openbuffer(0), c);
}
if (endword && buf != NULL) {
Term *term = mkterm(sealcountedbuffer(buf), NULL);
value = mklist(term, value);
buf = NULL;
}
buffer = buf;
}
/* forkexec -- fork (if necessary) and exec */
extern List *forkexec(char *file, List *list, Boolean inchild) {
int pid, status;
Vector *env;
gcdisable();
env = mkenv();
pid = efork(!inchild, FALSE);
if (pid == 0) {
execve(file, vectorize(list)->vector, env->vector);
failexec(file, list);
}
gcenable();
status = ewaitfor(pid);
if ((status & 0xff) == 0) {
sigint_newline = FALSE;
SIGCHK();
sigint_newline = TRUE;
} else
SIGCHK();
printstatus(0, status);
return mklist(mkterm(mkstatus(status), NULL), NULL);
}
/* 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);
}
