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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "glk/frotz/processor.h"
namespace Glk {
namespace Frotz {
void Processor::flagsChanged(zbyte value) {
if (value & SCRIPTING_FLAG) {
if (!ostream_script)
script_open();
} else {
if (ostream_script)
script_close();
}
}
int Processor::save_undo() {
long diff_size;
zword stack_size;
undo_t *p;
if (_undo_slots == 0)
// undo feature unavailable
return -1;
// save undo possible
while (last_undo != curr_undo) {
p = last_undo;
last_undo = last_undo->prev;
delete p;
undo_count--;
}
if (last_undo)
last_undo->next = nullptr;
else
first_undo = nullptr;
if (undo_count == _undo_slots)
free_undo(1);
diff_size = mem_diff(zmp, prev_zmp, h_dynamic_size, undo_diff);
stack_size = _stack + STACK_SIZE - _sp;
do {
p = (undo_t *) malloc(sizeof(undo_t) + diff_size + stack_size * sizeof(*_sp));
if (p == nullptr)
free_undo(1);
} while (!p && undo_count);
if (p == nullptr)
return -1;
GET_PC(p->pc);
p->frame_count = _frameCount;
p->diff_size = diff_size;
p->stack_size = stack_size;
p->frame_offset = _fp - _stack;
memcpy(p + 1, undo_diff, diff_size);
memcpy((zbyte *)(p + 1) + diff_size, _sp, stack_size * sizeof(*_sp));
if (!first_undo) {
p->prev = nullptr;
first_undo = p;
} else {
last_undo->next = p;
p->prev = last_undo;
}
p->next = nullptr;
curr_undo = last_undo = p;
undo_count++;
return 1;
}
int Processor::restore_undo(void) {
if (_undo_slots == 0)
// undo feature unavailable
return -1;
if (curr_undo == nullptr)
// no saved game state
return 0;
// undo possible
memcpy(zmp, prev_zmp, h_dynamic_size);
SET_PC(curr_undo->pc);
_sp = _stack + STACK_SIZE - curr_undo->stack_size;
_fp = _stack + curr_undo->frame_offset;
_frameCount = curr_undo->frame_count;
mem_undiff((zbyte *)(curr_undo + 1), curr_undo->diff_size, prev_zmp);
memcpy(_sp, (zbyte *)(curr_undo + 1) + curr_undo->diff_size,
curr_undo->stack_size * sizeof(*_sp));
curr_undo = curr_undo->prev;
restart_header();
return 2;
}
/**
* TOR: glkify -- this is for V6 only
*/
static zword get_max_width(zword win) { return 80; }
void Processor::memory_open(zword table, zword xsize, bool buffering) {
if (_redirect.size() < MAX_NESTING) {
if (!buffering)
xsize = 0xffff;
if (buffering && (short)xsize <= 0)
xsize = get_max_width((zword)(-(short)xsize));
storew(table, 0);
_redirect.push(Redirect(xsize, table));
ostream_memory = true;
} else {
runtimeError(ERR_STR3_NESTING);
}
}
void Processor::memory_new_line() {
zword size;
zword addr;
Redirect &r = _redirect.top();
r._total += r._width;
r._width = 0;
addr = r._table;
LOW_WORD(addr, size);
addr += 2;
if (r._xSize != 0xffff) {
r._table = addr + size;
size = 0;
} else {
storeb((zword)(addr + (size++)), 13);
}
storew(r._table, size);
}
void Processor::memory_word(const zchar *s) {
zword size;
zword addr;
zchar c;
Redirect &r = _redirect.top();
if (h_version == V6) {
int width = os_string_width(s);
if (r._xSize != 0xffff) {
if (r._width + width > r._xSize) {
if (*s == ' ' || *s == ZC_INDENT || *s == ZC_GAP)
width = os_string_width(++s);
memory_new_line();
}
}
r._width += width;
}
addr = r._table;
LOW_WORD(addr, size);
addr += 2;
while ((c = *s++) != 0)
storeb((zword)(addr + (size++)), translate_to_zscii(c));
storew(r._table, size);
}
void Processor::memory_close(void) {
if (!_redirect.empty()) {
Redirect &r = _redirect.top();
if (r._xSize != 0xffff)
memory_new_line();
if (h_version == V6) {
h_line_width = (r._xSize != 0xffff) ? r._total : r._width;
SET_WORD(H_LINE_WIDTH, h_line_width);
}
_redirect.pop();
if (_redirect.empty())
ostream_memory = false;
}
}
} // End of namespace Scott
} // End of namespace Glk
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