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