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// sprit-forth: A portable subroutine-threaded Forth.
// Copyright (C) 2024 Clyne Sullivan <clyne@bitgloo.com>
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Library General Public License as published by
// the Free Software Foundation; either version 2 of the License, or (at your
// option) any later version.
//
// This library is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for
// more details.
//
// You should have received a copy of the GNU Library General Public License
// along with this library; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
#include "core.hpp"
#include "state.hpp"
#include <cstring>
State Forth;
void State::push(Cell value) {
if (sp >= ds.end())
Exec.terminate(Error::push);
*++sp = value;
}
Cell State::pop() {
if (sp - 1 < ds.begin())
Exec.terminate(Error::pop);
return *sp--;
}
void State::rpush(Cell value) {
if (rp >= rs.end())
Exec.terminate(Error::rpush);
*++rp = value;
}
Cell State::rpop() {
if (rp - 1 < rs.begin())
Exec.terminate(Error::rpop);
return *rp--;
}
Word *State::find(const char *s, int len)
{
for (auto w = latest; w; w = w->link) {
if (len == (int)strlen(w->name) && strncmp(s, w->name, len) == 0)
return w;
}
return nullptr;
}
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